SJ 20261-1993 Verification procedures for SWOB5 sweep frequency graphic instrument
Some standard content:
Military standard of the electronics industry of the People's Republic of China FL0150
SJ2026193
SWOB5 type sweep frequency graphic instrument
Verification regulation of
modelSwoB5polyskop
1993—02—09 Issued
China Electronics Industry Corporation
1993--05-1 Implementation
Military standard of the electronics industry of the People's Republic of China SWOBS type sweep frequency graphic instrument
Verification regulation of
model SWOB5polyskap
【Scope
「.1 Subject content
S,J2(261---93
This verification procedure specifies the verification conditions, verification items, verification methods, verification result processing and verification cycle of SWOB5 polyskap (hereinafter referred to as SWOB5).
1.2 Scope of application
This verification procedure is applicable to the verification of SWOB5: other types of RF sweep signal devices and various VHF and UHF sweep generators, etc. can also be verified with reference to this procedure.
2 Referenced documents
There are no provisions in this chapter.
3 Definitions
There are no provisions in this chapter.
China Electric Industrial Corporation of China 1993--02 (9) Issued 1
【9930501 Implementation
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4 General requirements
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4.1 Explanation and principle of the meter under test
RS SW gate>15 is a multifunctional instrument that combines RF sweep signal generator, linear amplifier, logarithmic amplifier, detection test and X-Y plotter. The display of measurement results is practical and intuitive. It can be used to measure the parameters of the system under test such as frequency response, gain and loss characteristics, impedance and matching characteristics. 4.2 Technical requirements
4.2.1 Frequency range
0. 1 ~ 1000MHz
4.2.2 Sweep width
1000M112
5～1000MHIz
0.3~50MHz
4.2.3 Parasitic FM
Carrier:
4.2.4 Sweep linearity
4.2.5 Indicator linearity
1: t.1.
4.2.6 RF output
1V±5%, 500:
0.7V±5%, 752.
Full range;
Variable;
Variable:
Carrier.
(Can be reduced by 6dB by the rear panel switch)
4.2.7 Output frequency response
0.5dB(0.1~1000MHz):|| tt||<0.15dB sweep frequency 1CMHz:
4.2.8 Output attenuation
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t)~70dB. Step 1dB:
Error:±0.5dB:
4.2.9 Sweep time
20ms～2#,
4.2.10 Harmonic suppression
C. 1~1MIIz:
1～1000MHz.
4.2.11 Non-spectral wave suppression
4.2.12 Linear amplifier (SWOB522)
Input impedance: 500kg
Deflection coefficient: C.2mV/cm;
Maximum sensitivity: <3mV. wwW.bzxz.Net
4.2.13 Logarithmic amplifier (SWOB52)
Input impedance: 100kn;
Measuring range: 10/20/50/80/100H; Display adjustable range: >70dB;
Noise level: 170mV;
Error: =1.5dR.
4.2.14 Measuring probe (SWOB5Z))
Impedance: 75m;
Frequency range: C.11C00MHz
Frequency response: =0.5dB (0.4～1000MHz. Take 100MHz as reference):
VSWR: ≤l.1.
4.2.15 Active detector (SWOB5Z.) Input voltage: 20uV~50mV;
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Frequency response: ±2dB (0.1～1000MHz);
Input VSWR: ≤t.3:
Impedance:
4.3 Verification conditions
4.3.1 Environmental conditions
750.
20±5℃.
a. Ambient temperature:
45%~75%.
b. Relative humidity:
c. Atmospheric pressure:
86～106kPa.
d. Power supply: 220V2%, 50Hz±1%, e. Surrounding environment: no direct sunlight, no mechanical vibration and electromagnetic field interference that may affect normal operation.
4.3.2 Calibration equipment
4.3.2.1 Spectrum analyzer
Frequency range: 9kHz~1.8GHz;
Input impedance limit: 500, 75g;
Center frequency accuracy, 5×10- of carrier frequency! 700Hz frequency counting accuracy,: 5×10-10Hz ±1LSB of carrier frequency; frequency response: ±1.5dB (internal RF attenuation 1odB): display dynamic range: -80dB
NV RAM:
Reference model:
4.3.2.2 Synthesized signal generator
Frequency range: 0.1～1040MHz;
Absolute level accuracy: ±IdB;
Resolution: 0.1dB:
Frequency response: =0.5dB (in odBm),
Output impedance: 500
Reference model: HP 8657A.
4.3.2.3 Measuring receiver
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Frequency range: 2.5~1300MHz:
RF frequency: 0~～--127dBm;
Relative accuracy: 土0.02dB:
土0.02dB/each 1F range conversion:
土0.04dB/each RF range conversion:
Main 1 digit:
Reference model: HP8902A.
4.3.2. 4 RF impedance analyzer
Frequency range: 1~1000MHz
Signal voltage: -20±3dBmm (502); Measurement accuracy: 0.007-0.000005F (F—test frequency.MHz) Reference model: HP4191.
4.3.2.5 Precision impedance converter
750/500.
5 Detailed requirements
5.1 Verification items and verification methods
5.1.1 Appearance and normal working inspection
5.1.1.1 The inspected instrument shall be accompanied by the product technical manual and necessary accessories. If it is not the first verification, the previous verification certificate shall be attached.
5..1.2 The inspected instrument shall have no mechanical damage that affects its normal operation and correct reading, and all knobs and switches shall work well.
5.1.1.3 Turn on the power supply and preheat for 15 minutes. Connect the measuring probe SWOB5Z or the active detector head SWOBSZ to the RF output terminal of the room. Adjust the knobs and switch the switches respectively. Pay attention to the curves, horizontal lines and vertical frequency scale lines or pulse frequency scales on the display. All functions should be normal. If there is any obvious abnormality, it should be sent for repair and can be verified after it is fully restored. 5.1.2 Verification of sweep width and center frequency TTTKAONTKAca-
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5.1.2.1 Connect the instrument according to Figure 1.
TEK2712
5.1.2.2 Set the frequency SPAN range of the spectrum analyzer to 0~1.2GHz (use the START/STOP key) and the sweep time to 1s/div. Set the AF switch of SWOB5 to 1000. Adjust the point cursor of the spectrum analyzer to the edge of the maximum swept frequency signal (-{.5dB), read the frequency value here, and record it in Table A1 of Recording A (Supplementary Part).
5.1.2.3 Set the △F switch of SWOB5 to 5~1000. Adjust the F knob to 5COMHz. Set the SPAN (span) of the spectrum analyzer to 1MHz/dit and 100MHz/div respectively. When the △F knob of SWOB5 is set to the minimum and maximum positions respectively, measure the minimum and maximum sweep widths and record them in Table A1. 5.1.2.4 Set the AF switch of SOB5 to 0.3~50. Set the SPAN of the spectrum analyzer to 1kHz/div and 5MHz/div respectively. When the △F knob of SWOB5 is set to the minimum and maximum positions respectively, measure the minimum and maximum sweep widths and record them in Table A1.
5. 1. 2. 5 Set the △F switch of SWOB5 to 0. Adjust the F knob so that the center frequency mark is at 0.1.100, 300500, 700, 900, and 1000 respectively. Use the false dot cursor of the spectrum marker to read the frequency value of each point (the resolution of the frequency counter in the spectrum analyzer is set to 10kHz) and record it in Table A2. 5.1.3 Verification of parasitic frequency modulation
Set the switch of SWOB5 to NARRW (narrow), the AF switch to 0. F is adjusted to 500MHz, the center frequency of the spectrum analyzer is set to 500MHz, and SPAV is set to 1kHz. The measured parasitic frequency deviation is recorded in Table A3. 5.1.4 Verification of frequency sweep linearity
Connect the X output of SWOB5 to the external input of the spectrum analyzer. Set the spectrum analyzer to external synchronization state, set the spectrum analyzer frequency START/STOP to 0/1000MHz. The sweep interval is 2s/div. Set the △f switch of SWOB5 to 1000, and adjust the SWEEPTIME knob. Make the graph of Figure 2 appear on the spectrum analyzer.
Set the counter resolution of the spectrum analyzer to 10kHz. Use the \4\ double-point light mark to read the difference between each two spectrum lines: Af, A/, A3, 4F, A/, etc. Select the maximum value A/ and the minimum value A/i, calculate the frequency sweep linearity (r) according to formula (1), and record it in Table A4.
5.1.5 Verification of indication linearity
Connect the measuring probe or active probe of SWOB5 to the RF output terminal (75α terminal), set the AF switch to 1000MHz, and the frequency mark button to 100MHz. Observe the vertical title line on the display, select the two sections with the worst linearity, and measure their geometric dimensions. See the figure in Figure 3.
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Calculate the indication linearity according to formula (2) and record it in Table A5. r =l:
Where; B-the widest dimension;
A-the narrowest dimension:
Indication linearity.
5.1.6 Verification of harmonic suppression
5.1.6.1 Connect the instrument according to Figure 1, set the AF switch of SWOB5 to 0, the START/STOP of the spectrum analyzer to 0/5MHz, and the resolution bandwidth to *AUTO. Adjust the F knob to make the carrier frequency of SWOB5 between 0.1 and 1MHz, observe its harmonic components, and use the double-point cursor to measure the level difference between the largest harmonic and the carrier. Record it in Table A6.
5.1.6.2 Expand the frequency range of the spectrum analyzer to 1.8 GHz. Adjust the F knob of SWOB5 to make the carrier range between 1 and 1000 MHz, and observe the difference between the level of the largest harmonic component and the carrier level. Record it in Table A6. 5.1.7 Verification of non-harmonic signal suppression
Use the same method as in 5.1.6. Measure the difference between the maximum non-harmonic signal level and the carrier frequency level and record it in Table A7. 8
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5.1.8 Verification of swept output voltage frequency response
5.1.8.1 Benchmark reference frequency response curve a. Connect the instrument as shown in Figure 4.
HP8903A
HP86E:
b. Preheat the instrument for 30 minutes and complete the self-calibration initialization procedure for all parameters of 1EK2712.
c. Adjust the RF output frequency of IIP8657 to 0.1MHz. Connect the RF signal to HP8902A with a 502 impedance RF cable. Adjust the output level attenuator of HP8657 so that the level reading of HP8902AF is 0dBml. Then connect the RF cable to the RF input of TEK2712 and set the input impedance to 50. Set the scanning time to [ms/div. Set the vertical scale to 1dB/div, and set the resolution bandwidth to "ALTQ\. Set the frequency * START/STOP\ to 0.1/1000MHz. Set the channel selection to +\A\ and make it work in the maximum value hold and record state. At this time, a spectrum line is recorded on the screen of TEK2712. Connect the cable to HP8902A again and keep the reading at 0dBm. Then transfer the cable to the RF input of TEK2712. Use the same method to record the second spectrum line. Repeat the cycle until the next line is recorded in the A channel of TEK2712. Complete frequency response curve from 0.1 to 1000MHz. 5.1.8.2 Verification of output voltage response
a. Connect the instrument according to Figure 1.
b. Set the AF switch of SWOB5 to 1000. Set the scanning time to 0.02s. Set the attenuator to 10dB. Set the scanning time of TEK2712 to 2s/div. Set the display channel to B. Other working conditions are the same as 5.1.8.1c. Use the B display channel to measure and store the dynamic frequency curve of 9
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SWOB5 (including the frequency response error of TEK2712). C. Set TEK2712 to B-~A state, that is, the B-A curve is shown in the B display channel as shown in Figure 5.
adE/div
≥-0. 6dB
This curve eliminates the frequency error of TFK2712 itself and truly reflects the frequency response curve of SWOBS output characteristics.
Use the double-point cursor to measure the difference L between the maximum and minimum values on the curve. Calculate the frequency response error S value according to formula (3). Record the result in Table A8. S
5.1.9 Verification of frequency response of 10MHx internal sweep frequency
5.1.9.1 Connect the instrument according to Figure 6.
50/50n
+（3 )
IIPBDO2A
5.1.9.2 Adjust the center frequency of SWOB5 to 500MHz, set the working status switch to 0. Set the output level to 10dB, and adjust the F knob to adjust the CW frequency from 495MHz to 505MHz in 1MHz steps. Read the corresponding voltage value from HP8902A in turn, select the maximum voltage value L and the minimum voltage value L, and calculate the 10MHz band frequency response rg according to formula (4). Record the result in Table A9. r.= Li— L,
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5. 1. 10 Verification of RF output level
Set the spread attenuator of SWOB5 to 0 dB, set the CW frequency to 500 MHz, and read the effective value of the voltage V on the HP8902A. If the output impedance of the instrument under test is 752, calculate its output voltage according to formula (5). Record the result in Table A10.
Va-V,·10°
+*+**{5)
Where: A Insertion attenuation of precision impedance transformer, dB5.1.11 Verification of RF output attenuator
5.1.11.1 Set the fine attenuator of SWOB5 to 10 dB. Change the value of the coarse attenuator from 0 dB to -60 dB in sequence, and read the level value from the HP8902A: V. , V,.V..Calculate the corresponding attenuation value according to formula 6) and record it in Table A11. A, -V. --V.
A, - V,-V,
A.=V,-V.
—40dB
5.1. 11.2Set the coarse attenuator of SWOBS to ~10dB, and change the value of the fine attenuator from 0 to -10dB in sequence. Read the corresponding level values on HP8902A respectively, calculate the corresponding attenuation values according to the same method as 5.1.11.1, and record them in Table A11.
5.1.12 Verification of the measurement range of the logarithmic amplifier Connect the measurement probe SWOB5Z to the RF output terminal and set the fine attenuator to 10dB. The range of the logarithmic amplifier SWOB5-Z. is 80B. The value of the RF coarse attenuator is gradually changed from -60dB to 0dB. The value of the digital display is read by the method of superimposing the horizontal value with the sweep frequency curve and recorded in Table A12. 5.1.13 Verification of the frequency response of the SWC)B5Z. detector head 11
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