Keysight U8903B, Руководство по обслуживанию

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4 Performance Verification for Digital Generator and Digital Analyzer
74 Keysight U8903B Service Guide
Balanced output sampling rate accuracy verification
This test measures the sampling rate accuracy on the balanced digital audio output of the
U8903B using the Keysight 53132A/53220A frequency counter to ensure that it is within
the published specification.
1 Connect the Keysight 53132A/53220A frequency counter input channel 1 and 2 to the
U8903B balanced digital output channel using the XLR female to two BNC male split
AES cable with separated
+ and – output lines as shown in Figure 4-5 .
Figure 4-5 Keysight 53132A/53220A to U8903B balanced digital output for balanced output sampling
rate accuracy verification
2 Configure the Keysight 53132A/53220A frequency counter as follows:
– Preset the equipment
– Channel 1 and channel 2 input impedance: 50
Ω
– Frequency measurement start arming source: Immediate
– Frequency measurement stop arming source: Timer
– Frequency arming and measurement gate time: 0.5 s
3 Configure the U8903B digital output channel to be tested as follows:
– Preset the U8903B
– Digital output type: Balanced
– Digital output voltage: 4 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 4-6 Balanced output sampling rate accuracy specification
Balanced output sampling rate accuracy specification Equipment used
± 5 ppm Frequency counter
U8903B Balanced
digital output
Keysight 53132A/
53220A frequency
counter
+
–
Split AES
cable