Keysight U8903B - Page 80

4 Performance Verification for Digital Generator and Digital Analyzer
80 Keysight U8903B Service Guide
12 Set the U8903B calibration digital output mode to NORM mode for AES/SPDIF.
13 Set the digital output sampling rate F
SR
as given in “Test record for unbalanced input
sampling rate accuracy verification” on page 155.
14 Set the U8903B digital analyzer to measure the sampling rate and record the
measurement reading as SR
meas
.
15 Compute the sampling rate error using the following equation based on the previous
recorded F
SR_FC
value.
Δ F
SRerror
ppm = [(SR
meas
– F
SR_FC
) / F
SR
] × 1000000
16 Repeat step 13 to step 15 for the rest of the F
SR
as given in “Test record for
unbalanced input sampling rate accuracy verification” on page 155 to complete the
verification of the different output sampling rates.
17 Repeat step 4 to step 16 with the digital unbalanced input impedance set to High
impedance (Hi-Z).