Frequency And Period Measurement Procedure - Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User's Manual

Frequency and period measurement procedure

NOTE
1.
2.
3.
4.
CAUTION
5.
NOTE
6.
7.
8.
Make sure the INPUTS switch is in the correct position. To use front panel
inputs, it must be in the "F" (out) position. For switching modules, it must be in
the "R" (in) position.
If a switching channel is presently closed (displayed), press OPEN to open it.
Perform one of the following steps to select function:
• Press FREQ to perform frequency measurements.
• Press SHIFT and then FREQ to perform period measurements.
Δ
Use the RANGE and
expected AC voltage. Details on range are provided in Section 4.
Apply the AC voltage(s) to be measured.
Do not apply more than maximum input level s ind icated in
Figure 3-11 and
If using a switching module, perform the following steps to close the desired
channel:
a. Press the CLOSE key.
Δ
b. Use , , , and
previously closed channel (if there is one) will open, and the specified channel
will close.
While in the normal measurement state, you can use the
channels. In general, each key press will open the presently closed channel, and
then close the next higher or lower channel.
Observe the displayed reading. If the "OVERFLOW" message is displayed, select
a higher range until a normal reading is displayed. Use the lowest possible range
for the best resolution.
To measure other switching channels, repeat steps 5 and 6.
When finished, press OPEN if there is a channel closed.
∇
keys to select a measurement range consistent with the
Figure 3-12 or instrument damage may occur.
∇
to key in the channel number and press ENTER. The
Basic DMM Operation
and keys to close
3-39