Keysight U8903B - Figure 4-4 U8903 B Balanced Digital Output to Its Own Balanced Digital Input for Bal- Anced Input Sampling Rate Accuracy Verification

4 Performance Verification for Digital Generator and Digital Analyzer
72 Keysight U8903B Service Guide
– SINE waveform frequency: 1 kHz
– SINE waveform amplitude: 1 FFS
– Digital output state: ON
4 Configure the U8903B digital input channel to be tested as follows:
– Digital input type: Balanced
– Digital input impedance: 110 Ω
– Digital measurement sample size: 16384
– Input coupling for both channel D1 and D2: DC
– Voltage detector for both channel D1 and D2: RMS
– AES audio format: LPCM
– Channels D1 and D2 FUNCTION1 to measure frequency
– Channels D1 and D2 FUNCTION1 to measure Voltage AC
5 Set the U8903B calibration digital output mode to BCOM mode for AES/SPDIF.
6 Set the digital output sampling rate F
SR
as given in “Test record for balanced input
sampling rate accuracy verification” on page 147.
7 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.
8 Compute the average sampling rate error, F
SRavg
using the following equation.
F
SRavg
= [(F
measure1
– F
measure2
) / 2] / 64
9 Record the F
SRavg
values in “Test record for balanced input sampling rate accuracy
verification” on page 147.
10 Repeat step 6 to step 9 for the rest of the F
SR
as given in “Test record for balanced
input sampling rate accuracy verification” on page 147 to complete the verification of
the different output sampling rates.
11 Connect the U8903B Balanced digital output to its own balanced digital input using the
AES cable as shown in Figure 4-4.
Figure 4-4 U8903B balanced digital output to its own balanced digital input for balanced input sampling
rate accuracy verification
U8903B
Balanced
digital output
Balanced
digital input
AES cable