Keysight U8903B, Service Manual

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3 Performance Verification for Analog Analyzer
46 Keysight U8903B Service Guide
7 Repeat step 4 to step 6 for the rest of the f
IN
values to complete the verification of the
U8903B input channel 2 (4, 6, or 8).
8 Repeat step 1 to step 7 to complete the verification of the other U8903B input
channels.
9 Compare the recorded phase accuracy values to the specification. If the test fails,
adjustment will need to be carried out accordingly.
Crosstalk verification
This test measures the leakage caused by stray capacitance and inductance coupling
between the U8903B input channels, to ensure that it is within the published specification.
A calibrator is used to generate a sine wave to the U8903B for the crosstalk measurement.
1 Connect the calibrator output to the U8903B input channel to be tested via the
Unbalanced connection as shown in
Figure 3-5 . The BNC-to-banana jack adapter is
used for this connection. Terminate the adjacent U8903B input channel with a 50 Ω
terminator. Preset both the U8903B and calibrator.
Figure 3-5 Audio generator to U8903B with terminator connection for crosstalk verification
2 Configure the calibrator as follows:
– Output state: Standby
Table 3-5 Crosstalk specification
Crosstalk specification Equipment used
≤ –140 dB (+0.1 μ V ≤ 20 kHz)
– Calibrator
– 50
Ω
terminator
NOTE
Power on the U8903B audio analyzer for at least 30 minutes before performing the
performance verification.
U8903B audio
analyzer
Calibrator
50 Ω
terminator
Unbalanced input
channel 1, 3, 5, 7
Unbalanced input
channel 2, 4, 6, 8