Operation Manual

Model 2750 Multimeter/Switch System User’s Manual Basic DMM Operation 3-11
Volts 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. Select the volts measurement function by pressing DCV or ACV.
3. Use the RANGE
Δ and ∇ keys to select a measurement range consistent with the
expected voltage, or press AUTO to select autoranging (AUTO annunciator turns
on). Details on range are provided in Section 4.
4. Apply the voltage(s) to be measured.
CAUTION Do not apply more than maximum input levels indicated in
Figure 3-2
and Figure 3-3 or instrument damage may occur. The voltage limit is
subject to the 8 × 10
7
VHz product.
Model 7700 switching module — The maximum allowable voltage is
300V DC or RMS. Exceeding these limits may cause damage to the
switching module.
WARNING If both the front panel terminals and the switching module terminals
are connected at the same time, the test leads must be rated to the high-
est voltage that is connected. For example, if 1000V is connected to the
front panel input, the test lead insulation for the switching module
must also be rated for 1000V.
5. If using a switching module, perform the following steps to close the desired
channel:
a. Press the CLOSE key.
b. Use , ,
Δ , 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 (or press AUTO for autorang-
ing). For manual ranging, 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.
2750-900-01.book Page 11 Wednesday, August 3, 2011 7:56 AM