Keysight U8903B - Page 59

Performance Verification for Analog Analyzer 3
Keysight U8903B Service Guide 59
– Input coupling: AC
– Voltage detector type: RMS
– Trigger source: Immediate
– Input voltage range:1 V
– Measurement function2: AC Voltage
– Sample size: 1048576 for 20 Hz / 524288 for 50 Hz / 262144 for above 50 Hz
6 Set the function generator to produce a sine wave with amplitude of 1 Vrms and
frequency of f
DUT
as given in the “Test record for wideband frequency accuracy
verification” on page 125.
7 Set the U8903B input channels sample size as given in the “Test record for wideband
frequency accuracy verification” on page 125.
8 Set the frequency counter gate time as given in the “Test record for wideband
frequency accuracy verification” on page 125.
9 Enable the function generator output.
10 Using the FETC? FUNC1,(@1) SCPI command for the U8903B, record the frequency
measurement on the frequency counter, f
FC
and the U8903B channel 1, f
Meas
in the
“Test record for wideband frequency accuracy verification” on page 125.
11 Compute the frequency accuracy of the U8903B using the following equation:
Wideband frequency accuracy = (f
Meas
– f
FC
/ f
FC
) × 1000000
12 Repeat step 6 to step 11 for the rest of the f
DUT
values to complete the verification of
the U8903B input channel 1 to be tested.
13 Repeat step 1 to step 12 to complete the verification for the U8903B input channel 2.
14 Compare the recorded wideband frequency accuracy values to the specification. If the
test fails, adjustment will need to be carried out according