2 Performance Verification for Analog Generator
32 Keysight U8903B Service Guide
9 Set the Driving channel output state to ON and the Measured channel output state to
OFF.
10 On the U8903B analyzer, enable the output for both the Driving and Measured
channels.
11 Record the crosstalk measurement obtained from the Measured channel in the “Test
record for crosstalk verification” on page 102.
12 Repeat step 5 to step 11 for the rest of the frequency, analyzer input range, and
generator output amplitude combinations to complete the verification of the U8903B
output channels to be tested.
13 Repeat step 4 to step 12 to measure the generator crosstalk from channel 2 to channel
1 in which the Driving channel is channel 2 and the Measured channel is channel 1.
14 Compare the recorded crosstalk measurement values to the specification. If the test
fails, adjustment will need to be carried out accordingly.
Square wave rise time verification
In this test, the U8903B generates a square wave swept over a set of frequencies, and the
rise time is measured using a Keysight DSO8064A/8104A digital oscilloscope to ensure
that it is within the published specification.
1 Connect the U8903B Unbalanced output channel 1 to the digital oscilloscope channel
1 and Unbalanced output channel 2 to the digital oscilloscope channel 2 as shown in
Figure 2-5. Preset both the U8903B and the digital oscilloscope.
Figure 2-5 U8903B to oscilloscope connections for square wave rise time verification
2 Configure the digital oscilloscope as follows:
– Trigger mode: Edge
Table 2-5 Square wave rise time specification
Rise time specification Equipment used
<2 μs Keysight DSO8064A/8104A digital oscilloscope
Unbalanced output
channel 1
U8903B audio
analyzer
Digital
oscilloscope
Unbalanced output
channel 2
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