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172 Service Procedures
Appendix D
AM Modulation Depth Verification
This test verifies the modulation depth specification.
Select each function generator output in the table below. Use a DMM to
measure the function generator ACrms output voltage. Compare the
measured results to the test limits shown in the table. This is a HIGH Z output
termination test.
Optional Performance Verification Tests
These tests are not intended to be performed with every calibration. They are
provided as an aid for verifying additional instrument specifications.
Square Wave Duty
Cycle Verification
This test verifies the duty cycle specification of the squarewave output.
Select each function generator output in the table below. Use an integrating
DMM to measure the VDC output of the function generator. Compare the
measured results to the test limits shown in the table. This is a HIGH Z output
termination test.
NOTE: You make a DC voltage measurement on this test.
Note
The DMM used for this test must be an integrating multimeter. If the first
step does not measure 0 VDC, use an oscilloscope for this test.
Do not use an auto-ranging function on the DMM for this test. Fix the
DMM measurement range at 10 VDC.
Table D-8. AM Modulation Verification
Agilent E1441A Measurement
AM Modulation +
Function Out
Te r m
a
Ampl Freq Shape Freq Depth Nominal Error
Q Sine wave HIGH Z 1.0 Vrms 1.00 kHz Sinewave 100 Hz 0% 0.50 Vrms ± 0.005 Vrms
Sine wave HIGH Z 1.0 Vrms 1.00 kHz Sinewave 100 Hz 100% 0.61 Vrms ± 0.0061 Vrms
a.The E1441A has a fixed output impedance of 50 Ω on the "Output" terminal. Use the OUTPut:LOAD
50 | INFinity | MIN | MAX command to set the output termination. HIGH Z assumes no load on output.
50 Ω assumes a 50 Ω ± 0.1 Ω load on output.
Table D-9. Square Wave Duty Cycle Verification
Function Out
Term
a
Ampl Freq Duty
Cycle
Nominal Error
O Square wave HIGH Z 1.0 Vrms 300.00 Hz 50% 0.00 VDC ± 0.020 VDC
O Square wave HIGH Z 1.0 Vrms 300.00 Hz 25% - 0.50 VDC ± 0.020 VDC
O Square wave HIGH Z 1.0 Vrms 300.00 Hz 75% + 0.50 VDC ± 0.020 VDC
a.The E1441A has a fixed output impedance of 50 Ω on the "Output" terminal. Use the
OUTPut:LOAD 50 | INFinity | MIN | MAX command to set the output termination.
HIGH Z assumes no load on output. 50 Ω assumes a 50 Ω ± 0.1 Ω load on output.