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All test equipment requires a 30 minute warm-up period to ensure accurate performance.
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In the following test setup, cables are designated as solid lines and direct connections are designated as dashed lines.
FM Frequency Response verifies that a selected FM deviation remains constant within ± 1 dB as the FM rate is varied from 20 Hz to 100 kHz and the UUT CW frequency is varied from 500 MHz to 1.0 GHz. If the UUT meets the frequency response specification in this CW frequency range, frequency response in all other frequency ranges will be assured.
FM deviation is set to 100 kHz at an FM rate of 1 kHz. The actual deviation is measured with a measuring receiver and stored as the reference deviation. While the deviation setting remains at 100 kHz, actual deviation is measured for FM rates between 80 Hz and 100 kHz. If the measured deviation at any test rate is more than 1 dB different from the reference deviation at 1 kHz, the test fails.
This test supports two equipment setups:
In the Agilent Recommended Variant setup, a PSA-series spectrum analyzer (E444xA) with Option 233 (measuring receiver personality) is used to demodulate the signal and measure the deviation.
In the Normal Variant setup, an 8902A measuring receiver is used to demodulate the signal and measure the deviation.
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Test Equipment |
Agilent Recommended Variant Models |
Normal Variant Models |
Alternate Model(s) |
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Spectrum Analyzer |
E444xA1 Opt 233 |
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Measuring Receiver |
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8902A Opt 002 |
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1.Depending on your frequency range needs, choose either an E4440A, E4446A, E4447A, or E4448A
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Connect all test equipment as shown.
Connect GPIB cables to all GPIB-controlled test equipment.
While performing this performance test, follow all instructions on the controller display.
FM Frequency Response Test Setup
Setup for Measuring Receiver Calibration
/MRCal.GIF)
Setup for Internal FM Frequency Response
/PSG_MR.GIF)
If this performance test fails, perform the following steps in order:
Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the performance test.
Refer to the troubleshooting section of the service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight website.
If necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.
