Keysight U8903B - Unbalanced Output Level Accuracy Verification; Figure 4-6 DSO8064 A Oscilloscope to U8903 B Unbalanced Digital Output for Unbalanced Output Level Accuracy Verification; Table 4-7 Unbalanced Output Level Accuracy Specification

4 Performance Verification for Digital Generator and Digital Analyzer
76 Keysight U8903B Service Guide
Unbalanced output level accuracy verification
This test measures the level accuracy on the Unbalanced digital audio output of the
U8903B using DSO8064A digital oscilloscope to ensure that it is within the published
specification.
1 Connect the Keysight DSO8064A oscilloscope input channel 1 to the U8903B
unbalanced digital output channel with the 75 Ω termination using the SPDIF/75 Ω
impedance cable as shown in Figure 4-6.
Figure 4-6 DSO8064A oscilloscope to U8903B unbalanced digital output for unbalanced output level
accuracy verification
2 Configure the DSO8064A oscilloscope as follows:
– Trigger mode: Edge
– Edge trigger slope: Positive
– Channel 1 offset: 0
– Channel 1 vertical axis unit: Volt
– Function 1: Enable
– Function 1 offset: 0
3 Configure the U8903B digital output channel to be tested as follows:
– Digital output type: Unbalanced
– Digital output voltage: 2.5 V
– Digital output sampling rate: 48 kHz
– Digital output AES audio resolution: 24 bits
– AES output: ON
– Digital output function: SINE waveform
– SINE waveform frequency: 1 kHz
Table 4-7 Unbalanced output level accuracy specification
Unbalanced output level accuracy specification Equipment used
±1 dB (typical), ±1.5 dB Digital oscilloscope
SPDIF/75 Ω
impedance cable
DSO8064A
Oscilloscope
U8903B
Unbalanced
digital output
75 Ω
termination