Keysight U8903B, Руководство по обслуживанию

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Performance Verification for Analog Analyzer 3
Keysight U8903B Service Guide 41
1 Connect the calibrator to the U8903B input channels to be tested via the Unbalanced
connection as shown in
Figure 3-2 . The BNC-to-banana jack adapter and the BNC
male-to-female T splitter are used for this connection. Preset both the U8903B and
calibrator.
Figure 3-2 Calibrator to U8903B connection for AC accuracy and flatness verification
2 Configure the calibrator as follows:
– Output state: Standby
3 Configure the U8903B input channels, channel 1 (3, 5, or 7) and channel 2 (4, 6, or 8) as
shown in
Figure 3-2 to be tested as follows:
– Connection type: Unbalanced
– Input bandwidth: 90 kHz
– Input coupling: DC
– Voltage detector type: RMS
– Trigger source: Immediate
– Function 2: AC Voltage
– Sample size: 262144 for 50 Hz and below, and 65536 for 50 Hz and above
– Input range: Refer to “ Test record for AC accuracy and flatness verification ” on
page 106
4 Set the calibrator to produce a sine wave voltage with amplitude of V
IN
and frequency
of f
IN
as given in the “ Test record for AC accuracy and flatness verification ” on
page 106 .
5 Enable the calibrator output by setting the calibrator output state to Operate.
6 Record the sine wave voltage measurement on both the U8903B measured channels,
V
DUT
in the “ Test record for AC accuracy and flatness verification ” on page 106 .
7 Compute the sine wave accuracy at 1 kHz using the following equation:
Sine wave accuracy (dB) = 20 × log
10
(V
DUT
/ V
IN
)
Unbalanced input
channel 1, 3, 5, 7
U8903B audio
analyzer
Calibrator
Unbalanced input
channel 2, 4, 6, 8