SJ 20259-1993 Verification procedures for 3195 image intermediate frequency marker synthesizer

SJ 20259-1993 Verification Procedure for 3195 Image Intermediate Frequency Marker Synthesizer SJ20259-1993 Standard download decompression password: www.bzxz.net

Military Standard of the Electronic Industry of the People's Republic of China FL0150
SJ20259—93
Model 3195 Image Intermediate Frequency Marker Synthesizer
Verification Regulationbzxz.net
Verification Regulation of Model 3195 PIF Marker Synthesizer
Published on 1993—02--09
China Electronics Industry Corporation
Implemented on 1993—05—01
Military Standard of the Electronic Industry of the People's Republic of China Model 3195 Image Intermediate Frequency Marker Synthesizer
Verification Regulation
Verification Regulation of Model 3195 PIF Marker synthesizer
1.1 Subject content
SJ20259—93
This verification procedure specifies the verification conditions, verification items, verification methods, verification result processing and verification cycle of the 3195 type image intermediate frequency sign synthesizer. 1.2 Scope of application
This verification procedure is applicable to the verification of the 3195 type image intermediate frequency sign synthesizer. 2 Reference documents
This chapter has only articles.
3 Definitions
This chapter has no articles.
4 General requirements
4.1 Purpose and principle of the inspected measuring instrument
China Electronics Industry Corporation Issued on February 9, 1993 Implemented on May 1, 1993 1
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SJ20259-93
This instrument, combined with a swept frequency oscillator, can be used as a marker for adjusting the image frequency circuit of a television receiver. The oscillator has the advantages of simple frequency adjustment. The computer circuit consists of a crystal oscillator, a frequency synthesizer, binary coded logic, frequency division, program instructions, low-pass filtering, automatic level control, output synthesizer, attenuator, etc. 4.2 Technical requirements
4.2.1 Oscillation frequency
4.2.1.1 Fixed oscillation frequency
37.00MHz:38.00MHz;38.90MFlz39.50MHz: 45.75MHz;58.75MHz
4.2.1.2 Variable oscillation frequency
30～70MHz.
4.2.2 Frequency accuracy
Fixed oscillator: 1X10\:
Synthetic oscillator: 1X10-
4.2.3 Output level
0.1Vm at the output end: (100dBμ=1dBu) (fixed and variable are the same). 4.2.4 Output impedance
4.2.5 Frequency characteristics
Synthesizer (variable oscillator part) 3070MHz1d. 4.2.6 Harmonic suppression
4.2.7 Output attenuator
1dB×10.10dBX4, a total of 50dB=1dB. 4.3 Verification conditions
4.3.1 Environmental conditions
8. Ambient temperature: 20±2C;
b. Relative concentration: 45%~75%:
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e. Atmospheric pressure: 86~106kPa
d. Power supply: 220V+2%.50Hz=1%: e. Surrounding environment: no mechanical vibration and electromagnetic field interference that may affect normal operation 4.3.2 Verification equipment
4.3.2.1 Level attenuation calibration device
Frequency range: 30～100MHz:
Accuracy: 0.1dB;
Input impedance: 750 (502 should be matched with 75/500); Reference model: ME642A.
4.3.2.2 Frequency counter
Frequency range: 20~100MHz
Accuracy: 1×10-,
VP4771, E324.
Reference number:
4.3.2.3 Spectrum analyzer
Frequency range: 100kHz～600MHz;
Dynamic range:>50dB
Moisture resistance: 75Q:
Reference model: TR4132N.QF4030.
4.3.2.475/50 matching transformer
Frequency range: 0~100MIIz
VSWR: 1.15;
Maximum power: 1W:
Impedance: 50/750:
Insertion loss: 5.7±0.2dB
Reference model: WAVETEX
5 Detailed requirements
5.1 Inspection items and verification methods
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S.20259—93
5.1.1 Appearance and normality inspection of the instrument5.1.1.1 The inspected 3195 type image intermediate frequency marker (hereinafter referred to as the inspected instrument) shall be accompanied by the product technical manual and necessary accessories. If it is not the first inspection, the previous inspection certificate shall be attached.
5.1.1.2 The inspected instrument shall have no mechanical damage that affects its normal operation and correct reading, and the switches and knobs shall work reliably.
5.1.1.3 The instrument shall be able to work normally after preheating for 30 minutes. 5.1.2 Output signal frequency accuracy verification
5.1.2.1 Connect the measuring instrument according to Figure 1.
Tested Instrument
Frequency Counter
5.1.2.2 Select the fixed or variable frequency switch of the tested instrument: or set it to FIXEDON. VARIABLEOFF: or set it to FIXEDOFF, VARIABLE ON. When selecting the variable frequency, use the (mechanical) digital dial selection switch to set the test frequency.
5.1.2.3 Set the output level of the fixed frequency: set the coarse attenuator to 90dB. Set the fine attenuator to 10dB. Set it to "FIXED0V". The output level is 10odBμ (0.1Vm). 5.1.2.4 Set the output level of the variable frequency: set the coarse attenuator to 90dB. Set the fine attenuator to 10dB. Set it to "VARIABLEON". Adjust the autoPut positioner (meter adjustment) so that the meter needle indicates at the SET mark, and the output level is 100lB (0.1Vm) . 5.1.2.5 When the fixed frequency standard is output at the limit, or when the fixed frequency standard and the variable frequency standard are output at the same time, the output meter pointer does not deflect, which is not an abnormal phenomenon. 5.1.2.6 The fixed frequency standard frequency is accurately set. Set the fixed frequency standard key of the instrument under test to "FIXFI) OV, set the variable frequency standard key to VARIABLE OFF, and adjust the output level to OOdBu. Use a digital frequency meter (frequency 4
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counter) to measure the frequency value of each fixed standard. According to (1) Calculate the relative frequency error QF. Record the result in Table A of Appendix A (Supplement). F.-F.
...(1)
Where: F is the nominal value of the frequency of the instrument under test, MHz; F is the actual value of the frequency of the instrument under test, MHz.
5.1.2.7 Frequency accuracy verification of variable frequency standard Connect the instrument as shown in Figure 1. Set the fixed frequency standard key of the instrument under test to \FIXEDOFF\, and the variable frequency standard key to \VARIABLEON\. Use a frequency counter to measure 30, 40, 50, 6 0, 70MHz, and 80MHz. Calculate the error according to formula (1) and record the result in Table A2. 5.1.3 Harmonic suppression test
Connect the instrument according to Figure 2, change the frequency of the instrument under test from 30 to 70MHz. Set the spectrum analyzer dispersion (frequency interval) to 10MIIz/div. Read the fundamental wave and the most spectral component in the frequency band on the spectrum analyzer carbon screen, and calculate the difference AV (Bμ) between the harmonic level and the fundamental wave level according to formula (2). Record the result in Table A3. AW-V, -V. ****
Where: Vi--fundamental wave level, dBu
V. Harmonic level. dBue
Tested instrument
++*+ (2)
Lai spectrum analyzer
5.1.4 Verification of output level accuracy and frequency characteristics 5.1.4.1 Connect the measuring instruments according to Figure 3.
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Tested instrument
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75m/500 matching device
Level attenuation calibration
5.1.4.2 Press the function keys of the tested instrument according to 5.1.2.2~5.1.2.4 settings, use the level attenuation calibration device to detect the output level of each point of the fixed frequency mark and the variable frequency mark respectively, calculate the level and frequency response error ^M according to formula (2), and record it in Table A4 and Table A5. aM=M,-M. -M
Where: M.—-nominal value of the instrument under test, dB; M, measured value.dB;
M:——matching transformer attenuation, dB.
5.1. 5 Attenuator verification
Connect the instrument according to Figure 2. Set the variable scale key of the instrument under test to "VARIABLE ON". Adjust the frequency to 70MHz. Use the level attenuation calibration device to measure the attenuation level of each level of coarse and fine attenuation. Calculate the error according to formula (2) and record it in Tables A6 and A7. 5.2 Verification result processing and verification cycle
5.2.1 A verification certificate shall be issued to the image intermediate frequency synthesizer that passes the verification. A verification result notice shall be issued to the unqualified one, and the unqualified item shall be noted. 5.2.2 The verification cycle is --- years. If necessary, it can be sent for inspection at any time. 6
National frequency nominal value
Variable frequency nominal value
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Appendix A
Verification record table format
(Supplement)
Fixed standard frequency accuracy verification
Variable standard frequency accuracy verification
Measured value||tt| |Harmonic suppression test
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Yanbiao lock
New standard rate
Nominal value
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Fixed output level accuracy and frequency characteristic test nominal
Variable output level accuracy and frequency characteristic test nominal
Actual value
Coarse attenuator test
Measured value| |tt||Additional Notes:
SJ2025993
Verification of Thin Attenuators
This standard was proposed by the Science and Technology Quality Bureau of China Electronics Industry Corporation. This standard is under the jurisdiction of the China Electronics Technology Standardization Institute. This standard was drafted by Dalian Television Factory.
The main drafters of this standard are Yang Yongchuan and Wei Yuwen. Project code: 075-1~47.
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