2 Performance Verification for Analog Generator
26 Keysight U8903B Service Guide
– Output grounding configuration: Floating ground
– Waveform: DC
– Output state: ON
4 Set both the U8903B output channel 1 and channel 2 to be tested to produce DC
voltage with amplitude of V
DUT
as given in the “Test record for DC accuracy
verification” on page 98.
5 Set both the digital multimeters’ range as given in the “Test record for DC accuracy
verification” on page 98.
6 Enable the U8903B output channels.
7 Record the DC voltage measurement on both the digital multimeters, V
DMM
in the
“Test record for DC accuracy verification” on page 98.
8 Compute the DC accuracy using the following equation:
DC accuracy = (V
DMM
– V
DUT
) / V
DUT
×
100
9 Repeat step 4 to step 8 for the rest of the V
DUT
values to complete the verification of
the U8903B output channels to be tested.
10 Compare the recorded DC accuracy values to the specification. If the test fails,
adjustment will need to be carried out accordingly.
Sine wave amplitude accuracy and flatness verification
This test verifies the accuracy of the sine wave voltage amplitude generated by the U8903B
over a range of amplitudes and flatness swept over a set of frequencies using two digital
multimeters to ensure that it is within the published specification.
1 Connect the U8903B generator Unbalanced output channel 1 to the first digital
multimeter and Unbalanced output channel 2 to the second digital multimeter as
shown in Figure 2-2. Coaxial cables with BNC connectors are used for this connection.
Preset both the U8903B and digital multimeters.
Table 2-2 Sine wave amplitude accuracy and flatness specifications
AC accuracy specification Flatness specification Equipment used
±1.0% (1 kHz)
– ±0.008 dB (from 5 Hz to 20 kHz)
– ±0.08 dB (from 5 Hz to 80 kHz)
2 × Digital multimeter
Power up the U8903B for at least 30 minutes before performing the sine wave amplitude
accuracy and flatness verification.
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