Keysight U8903B - AC Accuracy and Flatness Verification; Table 3-2 AC Accuracy and Flatness Specifications

3 Performance Verification for Analog Analyzer
40 Keysight U8903B Service Guide
– Trigger source: Immediate
– Function 2: DC Voltage
– Sample size: 131072
– Input range: Refer to “Test record for DC accuracy verification” on page 105
4 Set the calibrator to produce DC voltage with amplitude of V
IN
as given in the “Test
record for DC accuracy verification” on page 105.
5 Enable the calibrator output by setting the calibrator output state to Operate.
6 Record the DC voltage measurement on the U8903B, V
DUT
in the “Test record for DC
accuracy verification” on page 105.
7 Compute the DC accuracy using the following equation:
DC accuracy = (V
DUT
– V
IN
) / V
IN
× 100
8 Repeat step 4 to step 7 for the rest of the V
IN
values to complete the verification of the
U8903B input channels to be tested.
9 Repeat step 2 to step 8 to complete the verification of the remaining U8903B input
channels.
10 Compare the recorded DC accuracy values to the specification. If the test fails,
adjustment will need to be carried out accordingly.
AC accuracy and flatness verification
This test verifies the AC accuracy and flatness of the U8903B analyzer by measuring a
range of amplitudes swept over a set of frequencies supplied by a calibrator, to ensure that
it is within the published specification.
Table 3-2 AC accuracy and flatness specifications
AC accuracy specification Flatness specification Equipment used
±0.03 dB (1 kHz)
±0.008 dB (for 20 Hz to 20 kHz)
±0.08 dB (for 20 kHz to 80 kHz)
±0.1 dB (for ≤96 kHz)
Calibrator
NOTE
Power on the U8903B audio analyzer for at least 30 minutes before performing the
performance verification.