Keysight U8903B - Page 82

4 Performance Verification for Digital Generator and Digital Analyzer
82 Keysight U8903B Service Guide
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 unbalanced output
sampling rate accuracy verification” on page 158.
6 Set the frequency counter to measure the frequency of the output signal on Channel 1
and record the measurement as F
measure
.
7 Compute the sampling rate error using the following equation:
Δ F
error
ppm = [F
measure
– (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 unbalanced
output sampling rate accuracy verification” on page 158 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.