Keysight U8903B - Page 75

Performance Verification for Digital Generator and Digital Analyzer 4
Keysight U8903B Service Guide 75
– SINE waveform amplitude: 1 FFS
– Digital output state: ON
4 Set the U8903B calibration digital output mode to BCOM mode for AES/SPDIF.
5 Set the digital output sampling rate F
SR
as given in “Test record for balanced output
sampling rate accuracy verification” on page 150.
6 Set the frequency counter to measure the frequency of the output signal on Channel 1
and 2 and record the measurement as F
measure1
and F
measure2
respectively.
7 Compute the sampling rate error using the following equation.
Channel 1:
Δ F
error1
ppm = [F
measure1
– (F
SR
× 64)] / (F
SR
× 64) × 1000000
Channel 2:
Δ F
error2
ppm = [F
measure2
– (F
SR
× 64)] / (F
SR
× 64) × 1000000
8 Repeat step 5 to step 7 for the rest of the F
SR
as given in “Test record for balanced
output sampling rate accuracy verification” on page 150 to complete the verification
of the different output sampling rates.
9 Set the calibration digital output mode to back to NORM mode for AES/SPDIF.