SJ 20258-1993 Verification procedures for XB48 television standard signal generator
Some standard content:
Military Standard of the Electronic Industry of the People's Republic of China FL0150
SJ24258—93
XB48 TV Standard Signal Generator
Verification Regulation
Verification regulation of model XB48T standard signal generatorbzxZ.net
1993—02—09 Issued
China Electronics Industry Corporation
1993-05—01 Implementation
Military Standard of the Electronic Industry of the People's Republic of China XB48 TV Standard Signal Generator
Verification Regulation
Verification regulation of model XB48TV standlard signal generator1Scope
I.』Subject content
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This verification procedure specifies the verification conditions, verification items, verification methods, verification result processing and verification cycle of the XB48 type television standard signal generator (hereinafter referred to as XB48).
1.2Scope of application
This verification procedure is applicable to the verification of the XF48 type television standard signal generator. The verification of the inter-type television standard signal generator can also be carried out in accordance with this procedure. 2Referenced documents
There are no provisions in this chapter.
3Definition
There are no provisions in this chapter.
4—General requirements
China Electronics Industry Corporation 199302-09 Issued 1
1993-05-01 Implementation
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4.1. Purpose and source of the test equipment XB48 UHF TV standard signal generator can generate eight forms of ultra-high frequency standard signals in the frequency range of 470~960MHz, including unmodulated carrier signal, full TV modulation signal, internal and external sine FM signal, internal FM signal, internal FM and external amplitude modulation, internal amplitude modulation and external FM, etc. It is widely used in TV receivers, TV differential converters, TV decoders and other TV equipment and radio equipment. 4.2 Technical requirements
4.2. 1 Effective frequency range
470~960MHz.
4.2.2 Frequency error
4.2.3 Frequency stability
After one hour of preheating, the frequency change every fifteen minutes is less than 5×10″ of the rated nominal value.
4.2.4 Output voltage amplitude
Unmodulated and full-frequency modulation state output voltage amplitude: 500mV (114dBu); AM and FM state output voltage amplitude: 300mV (109.5 dBμ). 4.2.5 Output voltage error
The maximum output voltage frequency response error is: 2dB: Attenuator attenuation error is: 0~100B±10B: 100dB～110B±2dB.
4.2.6 Output voltage harmonic content
The harmonic content of 470-550MHz is 15dB lower than the fundamental wave: The harmonic content of 550~960MHz is less than 25dB. ||tt ||4.2.7 Unmodulated carrier output does not require frequency deviation
less than 400Hz.
4.2.8 Output end source impedance
500; standing wave ratio ≤1.7.
4.2.9 Auxiliary output valid
>100mV.
4.2.10 Instrument signal
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470~800MHz: ≤ 150μV
800~960MHz: 50gV.
4.2.11 External TV modulation
a. Polarity: Negative polarity,
b. Sensitivity: Input 1Vp2% positive polarity full-scale signal, depth reaches 80%, error is ±20%.
c. Frequency response: Modulation frequency is 30Hz~6.5MHz. Based on 100kHz, the depth response is 1. 5dB.
d. Pulse front edge: 0.1.us.
e: Input impedance: 750.
f. Degree nonlinear distortion: modulation depth up to 80%, degree nonlinear distortion <5%.
g. Differential gain error modulation depth up to 80%, differential gain error <5%. h. Differential phase error: modulation depth up to 80%, differential phase error <3%. i. Position characteristics: modulation depth changes from 20% to 80%, RF output amplitude changes dynamically <10%.
4.2.12 Frequency modulation
Address. Modulation frequency: 1000Hz±5%.
b. Frequency deviation indication error: ~75kH2,± 15%+ 5kHz; 0～25kHz.±15%+2kHz.
C FM demodulation distortion: <5%.
t. FM unnecessary AM: <5%:
4.2.13 External modulation
, modulation frequency range: 50H2~20kHz
b. Deviation indication range; 0～75kHz.
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c. Modulation response: based on 1kHz, ±dB+3kHz. d. Modulation sensitivity: frequency deviation 75kIIz. Modulation voltage effective value is less than 5V, e. Input impedance: 6002 (unbalanced).
4.2.14 Internal AM
a. Modulation frequency: 1000Hz±5%.
b. Amplitude modulation indication error: 0~90% 0~30% continuously adjustable: 0~80% error is 20% of the scale plus 4% absolute error.
c. Unnecessary frequency deviation: less than 3×10-400Hz of the nominal value of the carrier frequency. d. Envelope nonlinear distortion: less than 5% at 0%~80% amplitude modulation. 4.2.15 External amplitude modulation
a. Modulation frequency range: 100Hz~20klz. b. AM indication range: 0~90% continuous modulation. c. Modulation frequency response: based on 1kHz, 0%~80%, the error is ±(1dB+2%).
d. Modulation sensitivity: modulation voltage is less than 5V at 80%. e. Input impedance: 6000 (unbalanced). 4.2.16 Internal frequency modulation and external amplitude modulation at the same time, and internal amplitude modulation and external frequency modulation, the indicators are the same as those of single modulation.
4.2.17 The instrument is equipped with a frequency gain. The increment is greater than 200kHz (the gain knob is at 0 and the frequency deviation is tested. The frequency code is not tested after the increment is used). 4.3 Verification conditions
4.3.1 Environmental conditions
a. Ambient temperature: 20±2°C.
b. Relative humidity: 45%~75%.
C Atmospheric pressure: 86~106kpa.
d. Power supply: 220V±2%.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 Frequency meter
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Prediction range: 30Hz~1000MTHz;
Error: ±1×10%;
Reference model: HIP5300B.
4.3.2.2 Measurement receiver
Frequency range: 0.1MIIz[GHz;
Attenuation range: +30dBm~-20dBm0.2d
Frequency response measurement accuracy: ±0.3dB;
Amplitude modulation measurement accuracy: ±1.5%;
FM measurement accuracy: ±3%:
Distortion measurement range: 0~99.99%:
Demodulation distortion, FM demodulation distortion 0.06%: AM demodulation distortion 0.5%; Reference model: HP8902A.
4.3.2.3 Modulation degree measuring instrument (with intermediate frequency output) Frequency range: 500~1000MHz;
Intermediate frequency output: 100mV (r, m, s) 502 Modulation degree measurement accuracy: 1.5%±1 word: Demodulation distortion: 0.5%;
Reference model: TF2305.
4.3.2.4 Television test signal generator
Step: 6 steps or [0 steps, the amplitude error of each step is less than ±2%, and a 4.43MHz small amplitude subcarrier can be superimposed.
Pulse and bar signal: 20T pulse and filled with 4.43MHz subcarrier. K index ≤1%:
Reference model: XT-16A, XT--1B.
4.3.2.5 Oscilloscope
Bandwidth DC～100MHz;
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Scanning time factor: 0.02s~0.5s±3%: Vertical scanning sensitivity: 0.5mV/div~5V/div: 3% Reference model: LB0518.SBM-10.
4.3.2. Spectrum analyzer
Frequency range: 10MHz～18GIIz:
Measurement harmonic content accuracy: <2dB
Reference model: HP8590A, TR4110.
4.3.2.7 Leakage test sensor
Frequency range: 0~1GHz:
Reference model: RRF—003.
4.3.2.8 Standard UHF signal generator
Frequency range: 10kHz～1000MHz;
RF output level: 19B1~—131dBm; Frequency response: 1lB when <512MIIz;
±2dB when >512MHz;
Reference models: IIF2017, HP6071.
4. 3.2. 9 Low frequency signal generator
Frequency range: 10Hz～200kHz;
Frequency response: 0.02dB
Distortion: 1%;
Output voltage: 0～15V
Sine wave:
Reference model: XD7PM5134.
4.3.2.10 Mixer
Terminal A: Input modulated carrier signal
Frequency range: 450MI2~1CHz
Amplitude: 0l~-50CmV.
B terminal: input unmodulated carrier frequency signal
Frequency pool diagram: 450MHz~-1GHz:
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Amplitude: 3~5 times of the level at A terminal.
C terminal: output difference frequency signal between A terminal and B terminal
Frequency within ±50MIIz:
Voltage: 0~500mV.
Reference model: XB-48 matching product or TF2305 modulation index measuring instrument with intermediate frequency output.
4. 3. 2. 11 DG/DP measuring instrument
Input signal: Image part 0～1V-F:
Synchronous part 0～0.5Vp-mz
Repetitive wave part 0.05~0.3V,-1g
DG measurement range: 0.1%～15%, residual less than 0.1%. DP traceability range: 0.1°～30° residual less than 0.1°. Reference model: 948DG/DP measuring instrument.VS224.3.2.12 Standard demodulator
Frequency range: 400-900MHz;
Input voltage -, 300mV;
Input impedance: 500:
Video input: 01V-
Reference model: PM5560.
4. 3. 2. 13 Voltmeter
Voltage range: 0~30V;
Frequency range: 10Hz～1MHz:
Error: ±1%;
Reference model: TE2600.
5 Detailed requirements
5.1 Verification items and verification methods
5.1,1 Appearance and normal working inspection
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5.1.1.1 The inspected instrument shall be accompanied by complete technical instructions and accessories. If it is not the first verification, the previous verification certificate shall be attached.
5.1.1.2 The inspected instrument shall have no mechanical damage that affects normal operation, and the knobs on the panel shall rotate flexibly. Each button shall be able to be correctly positioned, and the meter head indication shall not be sluggish. 5.1.1.3 Prepare for use according to the instructions. Press the power switch, the indicator light will light up, and the level indicator should indicate.
5.1.1.4 Press the working status key and the modulation range key, the modulation indicator and the level indicator should indicate. The instrument can work normally after half an hour of power on. 5.1.2 Verification of output frequency accuracy
5.1.2.1 Connect the measuring instrument according to Figure 1. Connect the unmodulated carrier signal of XB48 from the output end to the input end of the frequency meter with a 502 RF cable. XH-18
Rate meter
5.1.2.2 Select the frequency point according to Table A1 in Appendix A (Supplement) and tune the carrier frequency. Adjust the output level indicator to the red line in turn, and read the corresponding frequency with the frequency meter. Calculate the error according to formula (1) and record it in Table A1. ff,
\×100%
wherein; f. nominal value of the tested rate;
actual value of the tested frequency.
5.1.3 Verification of frequency stability
5.1.3.1 Connect the measuring instrument according to Figure 1. Set the frequency of XB48 to high. After the instrument is preheated for 1 hour, make the "level indicator on the red line, and set the attenuator (dB) to the unconnected state (no attenuation). Within 1.5 hours, use the frequency meter to measure the frequency value of the carrier frequency every 15 minutes, and measure ~f in turn, a total of seven frequency values, and calculate the corresponding F value. △F=8
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fi+一［fu-) is the (i+1)th frequency value: f is the i-th frequency value, recorded in Table A2
5.1.3.2 Frequency stability S, calculated according to formula (2). The stability is calculated from the two adjacent frequency values with the largest carrier frequency difference.
Where: -XB48 nominal frequency value:
fmr——the maximum carrier frequency difference 15 minutes apart. 5.1.4 Verification of maximum output and carrier voltage frequency error 5. 1. 4.1 Connect the measuring instruments according to Figure 2. Before verifying XB48, first calibrate the reverse level of the HP8902A measuring receiver.
Measurement receiver
5.1. 4. 2 Set the working state of XB48 to "unmodulated", "full TV", "internal AM", "internal FM", and the carrier frequency is set to 800MFIz: the attenuator is set to no attenuation, and the level indicator is adjusted to the red line. Use the content receiver to measure the maximum output level of each working state (expressed in dBμV) and record it in Table A3.
5.1.4.3 In the "unmodulated" state, change the carrier frequency of XB18, measure the carrier voltage frequency response according to Table A1, and calculate the error according to formula (3), and record the result in Table A4. o---V,....... (3)
Where: - Carrier voltage response error dB:
V: nominal voltage value, dB;
V. Actual voltage value, ctB.
5. 1.5 Verification of attenuation accuracy
5.1.5.1 Connect the measuring instrument according to Figure 2, and XB48 works in the unexhausted state. Tune 9
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The frequency indication is at 90MHz. The level indication is adjusted to the red line. The attenuation position is the same as in 5.1.3.1.
5.1.5.2 Press the XB48 attenuation button to change the attenuation from 0 to 130 in steps of 10, 5, 2, 1. Use the HP8902A measurement receiver to measure the attenuation change, and calculate the error according to formula (3), and record it in Table A5
5.1.6 Verification of harmonic content of output voltage
5.1.6.1 Connect the measuring instruments according to Figure 3.
5.1.6.2 XB48 works in the unmodulated state. Select the frequency point according to Table A6. Use the spectrum analyzer to trace the fundamental wave output level and the harmonic content of each carrier frequency point. Calculate according to formula (4) and record in Table A6,
AW-V.-Vi ......
Where: V.—-fundamental wave level.dBm
V. harmonic level.dBm;
A—difference between fundamental wave and harmonic level.dBm.
5.1.7 Verification of leakage
5.1.7.1 Connect the measuring instruments according to Figure 4.
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Spectrum Analyzer
RRF003 Connector
1m 50 yuan cable
S.1.7.2XB48 works in the final modulation state. The carrier output is maximum, and the voltage indicator is on the "red line". Select the frequency point according to Table A7.
5.1.7.3. Bring the RRF003 leakage signal test probe with a 502-meter-long impedance cable close to any position of the instrument under test at a distance of about 25 mm. Move the test probe to measure the leakage signal size of different parts of the instrument under test from the spectrum analyzer and find the maximum leakage signal value. Record it in Table A7.
5.1.8 Verification of carrier frequency parasitic frequency modulation
5.1.8.1 Connect the measuring instrument according to Figure 5.
Modulation meter
5.1.8.2 Set the working state of XB48 to unmodulated, and the attenuation position is the same as 5.1.3.1. The output level indicator is at the "red line" position. Tune the carrier frequency and select the carrier frequency point according to Table A8. Use the modulation index meter to measure the parasitic modulation frequency deviation values and record them in Table A8. 5.1.9 Verification of internal amplitude modulation, envelope nonlinear distortion and parasitic frequency modulation 5.1.9.1 Self-calibration of the HP8902A measurement receiver AM and FM functions. 5.1.9.2 Connect the measuring instruments according to Figure 2. Use the HP8902A modulation index function and remove the HP8902A AM insert.
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