Performance verification
AC Flatness te
st
This test verifies the flatness of a sine wave to the 1 kHz reference waveform.
1 kHz test setup
1. Connect a 50 Ω terminator to the DMM as shown in the following figure and
measu
re the resistance value.
Figure 8: 50 Ω terminator accuracy
2. Calculate the 50 Ω calibration factor (CF) from the reading value and record
as follows:
CF (Calibration Factor) = 2 / (1 + 50 Ω / Measurement Ω)
Measurement (reading of the DMM) CF
Ω
Examples
50.50 Ω 1.0050 (= 2 / (1 + 50 / 50.50))
49.62 Ω 0.9962 (= 2 / (1 + 50 / 49.62))
3. Connect the arbitrary function generator to the DMM as shown in the
following figure. Be sure to connect the 50 Ω terminator to the generator’s
side Output connector.
Figure 9: 1 kHz setup for AC Flatness test
4. Generate a 1 kHz, 4 dBm sine waveform with the generator.
5. Read the AC V
RMS
value on the DMM.
6. Find the reference of flatness at 1 kHz by converting V
RMS
to dBm as follows:
10 x log
10
(20(V
RMS
/CF)
2
)
56 AFG3000C and AFG3000 Series Specifications and Performance Verification
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