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35
Calibration Tests and Adjustment
Bandwidth
6 Reconfigure the equipment.
a Disconnect the signal generator cable from the oscilloscope input and connect it to
the test board.
b Connect the output of the differential probe to the channel 1 input of the
oscilloscope.
c Carefully connect the input of the probe to the test board in the position shown in
the figure below (signal to + input).
Figure 2-8
Signal to + input
7 Record the V
p-p
reading on the oscilloscope.
V
p-p
(1) = _____________ mV
8 Divide the reading from step 6 by the reading from step 4.
Record the result in the Calibration Test Record.
The result should be 0.707 or greater, indicating a probe bandwidth of 200 MHz or more.
The bandwidth can be checked at other signal levels. Change the signal generator output
level and oscilloscope V/div range proportionally.
NOTE Failure of the bandwidth test can be caused by mis-adjustment of the probe. Perform
the Probe Adjustment procedure in the Adjustments section later in this chapter.
Answer from step 6
Answer from step 4
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____________ =