35
Calibration Tests and Adjustment
Bandwidth
6Reconfigure the equipment.
aDisconnect the signal generator cable from the oscilloscope input and connect it to
the test board.
bConnect the output of the differential probe to the channel 1 input of the
oscilloscope.
cCarefully 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
7Record the Vp-p reading on the oscilloscope.
Vp-p (1) = _____________ mV
8Divide 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
----------------------------------------------- ____________ =