5-20 Performance Verification Rev. D Sept 2007
5.8 Offset Accuracy
Specifications
±(1.0% of offset + .5% of FS + 1mv)
Description
The offset test is done at 50 mV/div, with a signal of ±0.750 Volt cancelled by an
offset of the opposite polarity.
5.8.1 Positive Offset Accuracy
Procedure
Recall Offset - Positive.lss or configure the DSO:
Panel Setups : Recall FROM DEFAULT SETUP
Channels Trace ON Channel 1, Channel 2, Channel 3 & Channel 4
Input Coupling : DC 50Ω on all 4 Channels
Input gain : 50mV/div on all 4 Channels
Input offset : +0.750 Volt on all 4 Channels
C1 Averaging : 10 sweeps
C2 Averaging : 10 sweeps
C3 Averaging : 10 sweeps
C4 Averaging : 10 sweeps
Trigger setup : Edge
Trigger on : Line
Mode : Auto
Time base : 1 µsec/div.
Statistics : on
Change parameters
P1 : Measure mean of C1
P2 : Measure mean of C2
P3 : Measure mean of C3
P4 : Measure mean of C4
Connect the test equipment as shown in Figure 5-2.
Set the output of the external DC voltage reference source until the DVM
measures −0.750 Volt.
1) Verify that the displayed trace A : Average (1) is on the screen, near the center
horizontal graticule line. If the trace is not visible, modify the DC voltage
reference source output until the trace is within ± 2 divisions of center.
2) Connect the DMM and record the voltage reading in Table 7, column DMM.
3) Disconnect the DMM from the BNC T connector.
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