Performance Verification
AFG3000 Series Arbitrary/Function Generators Service Manual 4-23
6. (AFG3xx2 only) Repeat steps 3 through 5 for the channel 2 output.
DC Offset Test
This test verifies the DC offset accuracy of the arbitrary/function generator. This
test uses a 50 Ω terminator. It is necessary to know the accuracy of a 50 Ω
terminator in advance of this test. This accuracy is used for as a calibration factor.
1. Connect the 50 Ω terminator to the DMM as shown in Figure 4-4 and measure
the register value.
Figure 4-4: 50 ohm terminator accuracy
2. Calculate the 50 Ω calibration factor (CF) from the reading value and record
as follows:
AFG325x Measurement Range
Function Frequency Amplitude
Sine 1.000 kHz 30.0 mVrms mVrms (30.0 × CF ± 0.654) mVrms
Sine 1.000 kHz 300.0 mVrms mVrms (300.0 × CF ± 3.35) mVrms
Sine 1.000 kHz 800.0 mVrms mVrms (800.0 × CF ± 8.35) mVrms
Sine 1.000 kHz 1.500 Vrms Vrms (1.500 × CF ± 0.0154) Vrms
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))
DMM
BNC-Dual banana adapter + 50 Ω terminator
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