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Calibration Tests and Adjustment
dc Gain Accuracy
Figure 2-3
Signal to - input
10 Calculate probe gain as
Record the result of this calculation in the “Calibration Test Record” on page 39.
To pass this test, the probe gain = 0.98 to 1.02
NOTE Failure of the gain accuracy test can be caused by mis-adjustment of the probe. Perform
the Probe Adjustment procedure in the Adjustments section later in this chapter and
retest.
10x Attenuator Accuracy Test
NOTE If the gain test for the probe fails, the 10x Attenuator Accuracy Test will fail or the
results will be poor. Do not continue until the probe passes the dc gain test.
1 Disconnect the probe from the test board and connect the 10x attenuator
adapter to the probe.
2 Carefully connect the input of the probe/attenuator to the test board in the
position shown in the figure below (signal to + input).
∆V
out
∆V
in
--------------
V
out
1
V
out
2
–()
2 V
in
1
×
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