Keysight U8903B - Figure 4-8 U8903 B Unbalanced Digital Output to Its Own Unbalanced Digital Input for Unbalanced Input Sampling Rate Accuracy Verification

Performance Verification for Digital Generator and Digital Analyzer 4
Keysight U8903B Service Guide 79
– SINE waveform amplitude: 1 FFS
– Digital output state: ON
4 Configure the U8903B digital input channel to be tested as follows:
– Digital input type: Unbalanced
– Digital input impedance: 75 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 unbalanced input
sampling rate accuracy verification” on page 155.
7 Set the frequency counter to measure the frequency of the output signal and record the
measurement as F
measure
.
8 Compute the sampling rate, F
SR_FC
based on the frequency counter measurement value
using the following equation.
F
SR_FC
= F
measure
/ 64
9 Record the F
SR_FC
values in “Test record for unbalanced input sampling rate accuracy
verification” on page 155.
10 Repeat step 6 to step 9 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.
11 Connect the U8903B unbalanced digital output to its own balanced digital input using
the SPDIF or 75 Ω impedance cable as shown in Figure 4-8.
Figure 4-8 U8903B unbalanced digital output to its own unbalanced digital input for unbalanced input
sampling rate accuracy verification
U8903B
Unbalanced
digital output
Unbalanced
digital input
SPDIF or 75 Ω
impedance cable