Some standard content:
National Standard of the People's Republic of China
Stabilizcd supply apparatus for measurement
This standard is equivalent to the international standard IEC44374 "Stabilizcd supply apparatus for measurement". 1 Overview
1. Scope
1.1.1 This standard applies to the following devices:
a: Stable power supply apparatus designed to provide medium voltage and (or) current calibration values when measuring electric bases; h. Accessories applicable to these devices,
UDC 621.316
GB 909388
Note: Power supply apparatus designed to provide calibration values should have a specified accuracy under reference conditions and be roughly in the same order of magnitude as its stability level. Generally, power supply apparatus within this range belongs to the performance concept range of electronic measuring devices. On the contrary, power supply apparatus whose accuracy under reference conditions is significantly lower than its stability level is not acceptable according to the provisions of this standard. 1.1.2 According to the different output, the power supply device can be divided into the following types a.
DC regulated voltage power supply:
AC regulated voltage power supply:
DC regulated current power supply:
AC regulated current power supply.
For relevant safety requirements, see GB179384 Safety requirements for neutron measuring instruments 111.1.33
1.1.4 In this standard, the term "power supply device" or "device" refers to any device and accessories that meet the scope of this standard. 1.2 Purpose
To unify the method of expressing the electrical characteristics of power supply devices for measurement: To specify the special terms and definitions of these devices: To specify the test methods of such devices to verify the requirements or characteristics of the device. 2 Definitions
2.1 Power supply devices and components
2. 1. +Power supply device is a device that usually obtains energy from the power grid and supplies electrical energy to one or more loads in a transformed form. 2.1.1-1 Stabilized supply apparatus A power supply apparatus having one or more stable output quantities. 2.1.2 Components used for stabilization See figure, Instructions for use: 1) In IEC443, it is IEC:348, GB 9093--88 2.1.2.1 Output control device Output control device A device used to adjust the values specified in 2.2.1.1 and 2.2.1.2. 2.1.2.2 Reference source A source of electrical quantity, the value of which is used as a reference in the closed circuit. Final control component
Modifier
Continuous control component
Comparator
Reference source
Figure 1 Overview of the source of a stable power supply device using a closed-loop stabilization method 2.1.2.3 Comparator A device that compares the output value of a comparator with a specified reference value to generate a difference signal (error signal). 2.1.2.4 Error amplifier A device that amplifies the difference signal (error signal) of the comparator. 2.1.2.5 Final control element A device that finally controls the output to a specified value. 2.1.3 Accessory accessory
A device or equipment used in conjunction with a power supply device. 2-2 Basic terminology
2.2.1 General terminology
2.2.1.1 Performance characteristicperformancecharacteristic is a quantity that determines the performance of a device and gives the device a visual representation by means of numerical values, tolerances, ranges, etc. Note: The term "performance characteristic" does not include any value that affects the device. 2.2.1.2 Rated valuebzxZ.net
A certain effective value, output, or value that can be supplied or set by the manufacturer for a device
For a main power device with calibrated output control, the rated output is the value indicated by the main control device. For a power device with a specified output, the rated output is the output value indicated on the main control device.
② "Rated value" and "current" in AC recording refer to the root mean square value, unless otherwise specified. 2.2.1.3 Rated range (setting range) Rated range (setting range) The range of values that can be supplied or set for the device specified by the manufacturer. Note: The rated range is the range in which the quantitative value can be adjusted. 2.2.1.4 Effective range (control range) Effective range (cottrol range) The rated range part of a certain quantity that can be supplied within the specified error limit. 2.2.2 Stabilization
Use the method inside the power supply device to reduce the influence of the change of the influencing quantity and (or) the influencing characteristic on the output quantity. 2.2.2.1 Closed loop stabilization GB 9093-88
Compare the output value with the reference value, and use the difference between the two to directly or indirectly control the output to the specified value. 2.2.2.2 Open loop stabilization Stabilization controls the output to a specified value through methods within the power supply device, without considering the difference between the output and the specified value.
2.2.2.3 Stabilized quantity The output of the power supply device after stabilization. Note: Usually it is the stable output voltage and (or) output current. ② The AC power supply device can be characterized according to the definition of the following notes, based on the basis of the membrane being stabilized. ③ There is at least one stable quantity, but for some special devices, multiple stable quantities can be specified. ③ For voltage stabilization devices, voltage is the stable quantity and current is the affecting characteristic; for current stabilization devices, current is the stable quantity and voltage is the affecting characteristic. The output voltage or current can be divided into:
stable average value;
stable root mean square value (effective value);
rated peak value.
These terms refer to the stabilization of the given value of the output voltage (current) to the specified value. 2.2.2.4 Remote sensing remote sensing The method of monitoring the stable output quantity of the power supply device by using an additional sampling wire on the load. Note: The circuit effect of the resulting circuit is to compensate the voltage drop on the load wire to the specified limit. 2.3 Terms about influencing quantities
2.3. 1 Influence quantity is usually any quantity external to the power supply device that can affect the characteristics of the device. Note: When a performance characteristic is in front of another performance characteristic, it is considered to be an influence characteristic. 2.3.2 Reference condition A set of values with tolerances or limits specified for influence quantities and, if necessary, influence characteristics for comparison or calibration tests.
2.3.2.1 Reference value Reference value is the value of the influence quantity specified for the reference condition.
2.3.2.2 Reference range Reference range is the range of influence quantities specified for the reference condition. 2.3.3 Rated range of use The range of values of the influence quantity within which the specified operating error is to be met. 2.3.4 Rated operating conditions Rated range of use The entire valid range of performance characteristics and influence quantities The rated performance is specified within this range. 2.3.5 Limit conditions of operation The entire range of values of influence quantities and performance characteristics (over the rated range of use and the respective valid range). Within this range, the basket can work without damage, or the device will not reduce performance when it is subsequently operated under rated conditions. Activity: Usually, the limit condition does not include overload. 2.3.6 Storage and transportation conditions condirions of storage and transport temperature, humidity, atmospheric pressure, vibration, shock and other conditions. Within these conditions, the instrument is stored or transported in a non-operating state, and will not cause damage or performance degradation when the instrument is subsequently operated under rated conditions. 2.4 Error terms
2.4.1 Error
GB9093-88
Error expressed algebraically in the unit of the supplied quantity. For power supply devices, the error is the true value of the supplied quantity minus the rated value, indicated value or preset value. Note: The true value of a quantity is measured in a process without measurement errors; in fact, the true value cannot be obtained from the measurement, and a conventional true value that is approximately equal to the true value (whose error must be determined) must be used to replace the true value, or it must be obtained from a standard or national standard agreed upon by the manufacturer and the user. In both cases, the uncertainty of the conventional true value must be specified. 2.4. 1.2 Relative errorrelative erronThe ratio of absolute error to the conventional true value.
2.4.1.3 Percentage errorpercentageerrorRelative error expressed as a percentage. For example, percentage of full scale (maximum value of the effective range), percentage of indicated value or preset value or rated value,
2.4.1.4 Fiducial value
Value used as a reference for specifying percentage error. For example, the upper limit of the effective range or other clearly specified value. 2.4.2 Error limit linitsaferror
Maximum error specified for the supply quantity when the device works under specified conditions. 2.4.3 Basic error intrinsicerroroi
Error determined under reference conditions.
2.4.4 Operating error operating crrorError determined under rated operating conditions. 2.4.5 Influence error influenceerror
Error determined when an influencing quantity takes any value within the rated use range (or when an influencing characteristic takes any value within the effective range), all other influencing quantities are under reference conditions. =Assume that within the entire rated use range, there is a linear relationship between the influence error and the effect caused by it, which can be conveniently expressed in coefficient terms.
2.4.6 Stability error (drift) The difference between the indicated value of the device and the supply value within a specified time when other conditions remain unchanged. Proof: Stability error includes drift as well as periodic and random errors (see 2.B). 2.4.7 Variation
The difference between two performance characteristic values when an influence quantity takes two different specified values in turn between the rated use range, and other influence quantities remain under reference conditions,
2.4.8 Influence coefficient influencecuefficient---The change in output caused by a unit change in an influence quantity, all other influence quantities remain under constant reference conditions. Note that the influence coefficient should always be given as the maximum slope of the characteristic, see Figure 2. 2.5 Waveform distortion
No unified regulations are made for the time being.
2.6 Terminology related to temperature performance
2.6.1 Ambient temperature The medium temperature around the power supply device, the ambient temperature is the air temperature of the device. Note: ①) The ambient temperature is the manufacturer's specification of an allowable ambient temperature, and the power supply device should not exceed this temperature during operation. ② For a stable power supply device with a forced cooling unit, the ambient temperature is measured at the cold air inlet. In practice, the temperature is taken as the average of the temperatures measured at each measuring point, which are located at a level of 0 to 5 cm above the bottom of the sample and are located between the sample and the wall or 1 cm away from the sample, whichever is smaller. When the power supply device is installed on a rack, the outer shell of the rack can be regarded as a step. Note:
GB 9093--88
③ When the sample is subjected to a forced cycle test for heat dissipation, the concept of ambient temperature is no longer applicable. In this case, the adjustment shall be carried out according to the requirements of the existing surface temperature or the relevant specifications, and the use range shall be determined according to the most appropriate influence coefficient, the number of influences, etc. 2.6-2 Thermal equilibrium The state in which the internal temperature of the power supply unit no longer changes significantly. 2.6.3 Adjustment time The time interval between the change of the influencing quantity or output setting and the point of change of the output quantity caused only by drift or periodic and random deviations (see 2.8.1).
2.6.4 Warm-up time
The time from the switch on to the power supply device meeting all performance requirements under specified conditions. 2.7 Terms related to transient performance
2.7.1 Overshoot amplitude The difference between the peak value of the most instantaneous deviation of the output and its rated value or final value. Note: In this standard, this concept is only applicable when the instantaneous deviation exceeds the working error limit. 2.7.2 Recovery time
The time interval from the generation of a step change to the instant when the output enters and remains within the working error limit. 2.8 Terms related to periodic and random deviations
2.8.1 Periodic and random deviations (PARD) Periodic and random deviations of an output from its average value within a specified frequency band when all influencing quantities and influencing characteristics remain constant. Note: Within the specified frequency band, periodic and random deviations can be expressed in terms of root mean square value and (or) peak value. 2.8.1.1 Ripple
The periodic part of the periodic and random deviation in the output quantity, usually harmonics related to the output power frequency and/or the internal conversion rate.
2.8-1.2 Noise
The random part of the periodic and random deviation in the output quantity Note: It refers to the noise that is not mainly caused by heat sources (such as switching noise, quantization noise, etc.). In order to discuss these phenomena, Hilbert pointed out the characteristics of these distribution laws. 2.8.2 Drift
When other conditions remain constant, a slow and continuous change (unwanted) in the supply over a given time. GB 909388
Figure 3 Output transient caused by step change (working error band relative to rated value: 4-output sensitivity, influence quantity, t-time: A: output quantity starting value of step energy: 4-steady-state deviation: 4-rated output value; B-working error band with 1, as axis: 0%-overshoot amplitude relative to rated value A, .I, influence and influence of output value before and after the change: Tk-recovery time Note: Drift includes periodic and random deviations from zero frequency (DC) to the upper limit of the specified frequency. The upper frequency limit specified for drift must be consistent with the lower frequency limit of periodic and random deviations so that all deviations are included in one or the other specification under constant working conditions. 2.9 Terms related to impedance (line and insulation) 2.9.↑Output impedanceoutputimpedance The ratio of the complex value of the sinusoidal voltage at the output terminal to the sinusoidal current, one of which is caused by the other and external causes. Note: Output impedance is a function of frequency,
2. 9. 1. 1 Output impedanceoutput resistanceThe ratio of the change in the increment of the DC output voltage to the change in the increment of the DC output current, where one of the quantities is caused by the other and by external factors.
2.9.1.2 The output impedance U of the AC stabilized power supply device is not yet uniformly regulated.
2.9.2CapacitancetoframeCapacitance measured between the specified terminal and the common point (such as the frame, the protection terminal or the ground). 2.9.3Transfer capacitancetransfercapacitanceThe capacitance measured between the specified input and output terminals. Note: Sometimes referred to as leakage capacitance.
2.9.4Output capacitanceoutputc aracitancr is generally the capacitance measured between the output terminals. In some special cases, such as when a capacitor is connected across the output terminals of a power supply, the output capacitance is the rated value of the capacitor. 2.9.5 Maximum setting voltage maxinurnflontingvoltage The maximum voltage that can be permanently maintained between the specified terminal and the frame for a floating output or input (control input). 2.9.6 Insulation resistance The resistance measured between any two specified points insulated from each other. 2.10 Technical specifications for control operation: 2.10.1 Control state GE 9093-88 The state in which the output changes due to intentional control by the operator, electrical signal or mechanical input. 2.10.1.1 discontinuous control resolution The maximum increment of the stable output value caused by the smallest step produced by the repeatable control element under discontinuous control (e.g., with switches, adjustable wire wound resistors). 2.10.1.2 incremental control coefficient The ratio of the increment of the stable output value to the corresponding increment of the control knob position. 2.10.2 control overshoot The overshoot caused by a step change in the output control device. 2.10.3 remote control The control of the output of the power supply device by an external control variable. Note: Usually, a specific remote control method will be named according to the signal or signal parameter applied, for example:. resistance control:
h. voltage control!
c, current control:
d, mathematical control.
2.10.3 remote control coefficient The ratio of the value of the control variable to the expected value of the output variable. Note: The control coefficient can be different within the range of the control value. 2.10.3.2 Remote control deviation remote control deviation The maximum difference between the actual value of the output and the control value divided by the remote control coefficient. Note: The control deviation includes nonlinearity, slope error and offset effects. 2.10.3.3 Control rate contral rate
As a result of the change of the control value, the maximum rate at which the stable output can change without exceeding the working error limit. 2.11 Terms about load characteristics
2.11.+ Load characteristic laad characteristic For a specified current type, the functional relationship between the output voltage value and the output current value. 2.11.2 Constant voltage/constant current crossover When the output current reaches a predetermined value, the working mode of the power supply device automatically changes from voltage stability to current stability, and vice versa.
2.11.3 Crossover area crossover area
The range of output values in which the working mode can change. Note: ① The output is not guaranteed in this area. ② The overlap area is given in the overlap area within the working error range unless otherwise specified. 2.11.4 Current Limitation (Current Limitation) Current limiting limits the output current of the voltage-stabilized power supply to a predetermined maximum value (fixed or adjustable), and automatically restores the output voltage to the positive band value after the overload short circuit is eliminated. There are three current limiting modes (see Figure 4):
Constant voltage constant current switching:
b. The output voltage decreases with the increase of current (also called automatic current limiting); c. The voltage and current decrease with the decrease of load resistance (also called foldback current limiting or reverse current limiting). Note: "Current limiting" applies to voltage-stabilized power supply devices and total current power supplies. The equivalent term should be "limiting". The following terms and definitions apply to voltage-stabilized power supply devices. 2,11.A.1 Current limiting value murranlimitina+heachalaGB 9093-88
decreases with the decrease of load resistance. Output current value when the output voltage exceeds the working error limit. FCL
Charge area
Figure 4 Current limiting form
CVCC--Constant voltage/constant current overlap current limiting: ACI.-Automatic current limiting; FCL Foldback current limiting: T\-Current limiting value; M-Maximum current limiting; 5 Short-circuit current value; y is the working error limit
2.11.4.2 Maximum value of limited current maximum value of limited current maximum value of limited current that can be obtained by a resistive load under normal conditions. Note: This value does not necessarily have to be obtained continuously. 2.11.4.3 Short-circuit values of limitcd currcnt The steady-state current value output by a stable power supply unit when the output terminal is short-circuited. 2.12 Terminology of combined operation of multiple power supply units Output current
In order to expand the output capacity of a single power supply unit, several power supplies can be connected in a combined manner. In addition to the output terminals, the terminals can be connected internally to form a working mode in which a single power supply (master power supply) controls several other power supplies (slave power supplies). 2.12.1 Slave operation A working method in which only stable power supply devices are interconnected and the master power supply is controlled separately to achieve systematic coordinated control. The characteristic of this combined control is that the output is basically proportional from all single power supplies. 2.12-2 Parallel operation A working mode in which all the output terminals of several power supplies are connected together, and all the negative terminals are connected together, so that the total load current is equal to the sum of the output currents of each power supply.
2.12.2.1 Parallel operation with specified load sharing A working mode in which the total load is distributed among these power supplies in a specified proportion when several power supplies are connected in parallel. 2.12.2.2 Slave parallel operation A working mode in which a master power supply is connected in parallel with one or more slave power supplies, and the output current of each power supply is always equal to or proportional to the output current of the master power supply.
2.12.3 Series operation in GB 9093-88
When several stable power supplies are working, the positive output terminal of the power supply is connected to the negative output terminal of another power supply, so that the output voltages of each power supply are added.
2.12.3.1 Series operation with specified load sharingA mode of operation in which several power supplies are connected in series so that the total voltage is distributed among these power supplies in a specified proportion. 2. 12. 3.2 Slave series operationA master power supply is connected in series with one or more slave power supplies, and the output voltage of the slave power supply is always equal to or proportional to the output voltage of the master power supply.
2.12.4 Slave tracking operationA mode of operation in which several stable power supplies including one or more slave power supplies are connected to each other (one of which has a common output terminal), and their outputs are always equal to or proportional to the output voltage of the master power supply. Note: The slave power supply can have the same polarity as the main power supply common output terminal or the opposite polarity. The latter situation is sometimes called external tracking. 2.13 Terminology of fault protection
2.13. 1 Over-current protection Over-current protection Protection of power supply devices and (or) connected equipment against a type of output current including short-circuit current Note: A stable power supply device can be an over-current protection of unlimited duration or limited duration (absolute or limited short-circuit protection). 2.13-2 Over-voltage protection Over-voltage protection Protection of power supply devices and (or) connected equipment against excessive output voltage (including open-circuit voltage) caused by a fault in the power supply device.
2.13.3 Under-voltage protection Under-voltage protection Protection of power supply devices and (or) connected equipment against excessively low output voltage caused by a fault in the power supply device. Note: This can be achieved by disconnecting the load. 2.13.4 Reverse voltage protection Reverse voltage protection Protection of the output terminal of the power supply device against positive voltage. 2.13.5 Reverse current protection Reverse current protection Prevents the current from being reversed into the power supply through the load. 2.13.6 Over temperature protection Over temperature protection Prevents the temperature of the power supply or its components from exceeding the specified value. 2.13.7 Reset reset
The method of resuming the work after the abnormal operation of the power supply is eliminated. The reset can be automatic or manual. 2.14 Terms related to input
2.14.1 Power factor pawer factom Active power divided by apparent power.
2.14.2 Displacement factor displacement factor Fundamental active power divided by the apparent power of the fundamental Note: When the distortion can be ignored, there is no difference between the power factor and the displacement factor. The power factor cus is applicable to both. 2. 14.3 Efficiency efficiency
Total output power divided by active input power. 2.14.4 System efficiency systemefficicncy Efficiency when the input power includes the input power required for the operation of any auxiliary devices. 2.14.5 Inrush current inrush current
The maximum instantaneous image of the input current of the power supply unit when the switch is turned on. 2.14.6 Input current distortion rlistortion af ihe itiput curren! The distortion of the input current when the power supply unit inputs an ideal sinusoidal AC voltage GB9093--88
2.14.7 Ripple of the input current ripple of the input current cnt The AC component of the input current of the power supply unit when the power supply unit is fed with a DC source as input and its internal resistance can be ignored. 2.14.8 Turn-on (turn-off) overshoot turn-on (turn-off) ovcrshoot The overshoot caused by the application (removal) of the power input or the on (off) of the power supply unit input switch. 2.14.9 Turn-on (turn-off) polarity reversal The instantaneous reversal of output polarity caused by the application (removal) of power input or the closing (opening) of the power input switch. 3 General requirements for instructions and tests
3.1 The conditions and methods described in the following clauses of this chapter can refer to the relevant instructions and tests: working error limits (Chapter 4, Chapter 5); basic error limits (Chapter 4, Chapter 6); influence error limits and variations (Chapter 7); other characteristics (Chapter 8, Chapter 9);
input requirements (Chapter 10).
3.2 For relevant instructions and verification, refer to Appendix A of the standard. 3.2.1 Explanation of error limits
3.2.1.1 The limits of operating error (applicable under rated operating conditions) should be given. 3.2.1.2 The limits of basic error (applicable under reference conditions) may be given. When no instructions are given, they are assumed to be equivalent to the working error limits. 3.2.1.3 Limits of influencing errors may be given. It is particularly useful to specify such limits when an influencing variable or influencing characteristic is a significant part of the operating error. It is also useful to show that the influence of any environmental condition on the operating error is negligible. Note: For stable power supply devices, the above mentioned variations are also possible. 3.2.1.4 The stability shall be determined by the manufacturer: a. Maximum time interval without exceeding the operating error limit: h. Stable error limit for a certain time interval. 3.2.2 Verification
3.2.2.1 Tests carried out on one or several combinations of influencing variables and response characteristics are in most cases sufficient to verify the performance characteristics of the device as defined by the operating error and operating conditions. The reference condition is one of these combinations. 3.2.2.2 Tests should preferably be carried out under reference conditions, which are the conditions which most closely approximate the conditions under which the calibration standards and calibration equipment are to function.
3.2.2.3 When additional tests are deemed necessary, they may be carried out under rated operating conditions and under any combination of influencing quantities and influencing values. Such tests are often costly and are usually carried out only by agreement between the manufacturer and the user. NOTE The manufacturer considers the combinations of values indicated in the product data sheet to be important. 3.3 Test methods
3.3.1 Tests carried out in accordance with this standard are type tests unless otherwise specified. 3.3.2 When carrying out type tests, each device shall be subjected to the tests specified in this standard as far as possible, in accordance with the agreement between the manufacturer and the user.
The order of the clauses in this standard does not imply the order of the tests. 3.3.3 When making measurements to verify the error limits, instruments which do not themselves significantly (or calculably) affect the values being measured shall be used unless otherwise specified.
In principle, the errors produced by these instruments when measuring should be negligible compared with the errors to be measured. 3.3.4 When the errors of the instruments cannot be ignored, the following principles should be followed. For example, if the instrument has a certain error limit in the given performance characteristics, and the manufacturer tests the instrument to cause a measurement error of ±! %, GB 9093-88
, then the error of the device being tested should be kept within the range of ± (e-n) %. On the contrary, if the user tests the same device with another device that causes a ± % measurement error, if the error of the device being tested exceeds the limit of ± e % but still remains within the limit of ± (e+m) %, there is no reason to consider the device unqualified. 3.4: General conditions for testing
The test should be carried out under the conditions given below; if agreed, it can be carried out under the combined conditions that can cause the maximum error value. 3.4.1 Recommended standard values and ranges of influencing quantities 3.4.1.1 The reference values or ranges of all influencing quantities, rated use ranges and operating limits, storage and transport conditions should be specified and selected from Annex A of this standard. If there are any exceptions, the manufacturer should clearly and clearly state them and indicate that they are exceptions.
3.4.1.2 The device can correspond to one set of rated use ranges for environmental conditions and to another set of network conditions, but this must be clearly specified by the manufacturer.
3.4.1.3 For testing of the stable power supply device for measurement, the influencing quantities and their reference values and (or) ranges can be selected according to Table 1. Table 2 gives some selections of influencing quantities and rated use ranges. Tables 1 and 2 apply to the stable power supply of the first group: these conditions are usually available in laboratories and factories.
For some influencing quantities, the values given in these tables are supplementary to the values listed in the above standards. 3-4.2 Other conditions
3.4.2.1 If there is a protective grounding terminal, it should be connected to the ground. 3.4.4.2 When powered by a DC or single-phase AC power grid, the line and neutral wires should be interchangeable unless otherwise specified in the instruction manual.
All optional accessories to be connected to the power supply device must be connected properly. 3. 4.2.3F
Table 1 Reference conditions for the test
Influence quantity or influence duration
Ambient temperature
Atmospheric pressure
Relative humidity of air
Alternating voltage waveform distortion
Ripple of direct current
Source impedance
Reference components
Reference temperature\
20.23, 25 or 27℃
45%~75%
Rated current within the reference range or any voltage within the reference range Rated frequency or any period sinusoidal"
Produce a 1.5% current drop!
Tolerance of reference channel
Input power consumption of the device:
s5c W.+1C
>50 W.+2r
—5 kPa
±1% of mean square error
If ≤200Hz:±1%
200 Hz:±2%
Envelope distortion limit 313
Peak-to-peak true value of ripple current 5%
The limit of input voltage drop is between
1% and 2%
Influence quantity or influence characteristic
Power factor
Load time band
External magnetic field
Other influence quantities, such as movement, dust, etc.
Note: 1) If not specified, 20℃
CB 9093---88
Continued Table 1
Reference conditions
Maximum rated current
(See 2.2.2.3)
Maximum rated current
(See 2.2.2.3)
Rated frequency or active frequency within the reference range=1
Tolerance of reference value
If ≤200 FIz:+1%
>200 Hz:±2%
Only for resistive load
Upper normal position specified in the manual
Cannot be measured
Cannot be measured
According to the specification
Earth magnetic field
Can be measured
2) Make the waveform within the envelope formed by Y. and Y, Determine the waveform distortion from the Lis coefficient 3, Y+ 4(1 + β) sinat fr
... A(1 -- P) sint
The distortion is measured when the power supply is not connected to a load. 3) AC power supply (see 1.1.2) The distortion coefficient of the input waveform shall be determined by the effective value when the power supply device with rated load is connected to the AC source and the distortion coefficient is greater than 9 and less than 5%. 4) The distortion coefficient of the input waveform shall be determined by the effective value when the power supply device with rated load is connected to the AC source. When the power supply device is in the process of adjustment in the power grid or is connected to a pulse load, which may cause a voltage drop in the form of a pulse, it may be necessary to sign a special agreement between the manufacturer and the user. Table 2 Rated working conditions of the first use group device Influence quantity
A. Only consider the slow change of the influencing quantity
Ambient temperature
Input frequency
Input waveform distortion
Input source impedance
Output power factor
3. Consider the slow change and jump change of the influencing quantity Input voltage
Transmission voltage (high-voltage power supply device)
Output voltage (stable current power supply device)
Rated use range
5~40℃
±5% of the rated value
Envelope distortion limit 9≤0.051
No unified regulations for the time being
In the process of manufacturing Between the limits quoted by the manufacturer
-10% of the rated value
Between 0% and 100% of the maximum rated value,
Unless the manufacturer quotes other limits
For the fundamental wave, in the case of no power supply, it can be measured at any phase position of the harmonic:
2) For AC power supply devices (see 1.1.2> The distortion coefficient of the input waveform. According to the additional requirements, it should be less than 5%. 3.5 Preparation for the test
Before the test, the following preparations should be made:
3.5.1 Select the adjustment (if any) according to the manufacturer's instructions. 3.5.2 Before connecting the power supply, the device should be balanced with the ambient air temperature and humidity. 3.5.3 The device should work under reference conditions and connect the load, and preheat for the preheating time specified by the manufacturer. If there is no specification, the preheating time should be 1h
3. 5.4 After preheating, use the control method provided in the manual to make up for the loss.
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