Performance verification
Amplitude test
This test verifies the amplitude accuracy of the arbitrary function generator. All
output amplitudes are derived from a combination of attenuators and 3 dB variable
gain. Some amplitude points are checked. This test uses a 50 Ω terminator. It
is necessary to know the accuracy of the 50 Ω terminator in advance of this
amplitude t
est. This accuracy is used as a calibration factor.
1. Connect the 50 Ω terminator to the DMM as shown in the following figure
and measure the resistance value.
Figure 4: 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
Exam
ples
50.5
0 Ω
1.00
50 (= 2 / (1 + 50 / 50.50))
49.
62 Ω
0.9
962 (= 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 5 : Amplitude test
52 AFG3000C and AFG3000 Series Specifications and Performance Verification
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