3-48 Basic DMM Operation Model 2701 User’s Manual
Frequency and period measurement procedure
NOTE 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.
1. If a switching channel is presently closed (displayed), press OPEN to open it.
2. Perform one of the following steps to select the function:
• Press FREQ to perform frequency measurements.
• Press SHIFT and then FREQ to perform period measurements.
3. Use the RANGE
and keys to select a measurement range consistent with the
expected AC voltage. Details on range are provided in Section 4.
4. Apply the AC voltage(s) to be measured.
CAUTION Do not apply more than the maximum input levels indicated in
Figure 3-17 and Figure 3-18 or instrument damage may occur.
5. If using a switching module, perform the following steps to close the desired
channel:
a. Press the CLOSE key.
b. Use , , , and to key in the channel number and press ENTER. The
previously closed channel (if there is one) will open and the specified channel
will close.
NOTE While in the normal measurement state, you can use the and keys to close
channels. In general, each key press will open the presently closed channel and
then close the next higher or lower channel.
6. 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.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press OPEN if there is a channel closed.
Continuity testing
The instrument can test continuity using the 2-wire 1kΩ range. After selecting continuity,
you will be prompted to enter the threshold resistance level (1 to 1000Ω). When the
measured circuit is below the set threshold level, the instrument will beep and display the
resistance readings. When the measured circuit is above the threshold level, the instrument
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