Chapter VII Performance feature test
95
this frequency point. Obtain the set value A
1000M
at 1000MHz in the same method.
Close the RF signal source and amplifier output./
8) Connect the output end of the amplifier to the T/R port of the tested device, and set the signal
source as follows.
Frequency: 800MHz;
Power: A
800M
RF: OFF
9) Open the RF meter window by pressing the [Measurement] hard key and setting the instrument
menu. Enable the RF power function, and set it as follows.
Display unit: dBm
Average: OFF
Compensation frequency of frequency response: 800MHz
Enable the output of the signal source, read the RF power test result, and record it in Table A.13.
10) Change the output of the signal source as follows.
Frequency: 1000MHz;
Power: A
1000M
Change the RF power setting of the tested device as follows.
Compensation frequency of frequency response: 1000MHz
Enable the output of the signal source, read the RF power test result, and record it in Table A.13.
13. Accuracy of RF frequency error measurement
a) Test items
The RF output end of the synthetic source is connected to the ANT test port in the following steps.
As the common time base interface is not provided, the RF transmitter signal is tested to eliminate
the time base error and verify the accuracy of RF frequency measurement results. In order to
verify the error measurement range, set the deviation of RF input frequency as
200kHz to verify
the frequency error capturing capability again. The range of frequency error measurement of this
instrument is
200kHz, and the accuracy is
2Hz (time base error: +2Hz).
b) Test block diagram and meters
Instrument / equipment:
One BNC cable (30cm)
c) Test steps
1) Connect the device as shown in the figure, start it, and warm it up for 30min.
ANT input
SWR output
4992A
Rradio Test Set
Fig. 7-6 Block Diagram of RF Frequency Error Test
Summary of Contents for 4992A
Page 1: ...I 4992A Radio Test Set User Manual China Electronics Technology Instruments Co Ltd...
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Page 23: ...Article I Handling Instructions 11 Article I Handling Instructions...
Page 93: ...81 Article II Technical Specifications...
Page 132: ...Article III Maintenance Instructions 120 Article III Maintenance Instructions...
