Amps Measurement Procedure - Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User's Manual
Model 7700 switching module
Connections for the Model 7700 switching module are shown in
only channels 21 and 22 can be used for current measurements.
Figure 3-5
DCI and ACI connections using Model 7700 switching module
Current
Source
Caution: Maximum input: 60VDC or 30V RMS, 3A switched,

Amps measurement procedure

NOTE
1.
2.
3.
4.
CAUTION
5.
6.
7.
8.
NOTE
CH 21 or 22
60W, 125VA maximum
Make sure the INPUTS switch is in the correct position. To use front panel
inputs, it has to be in the "F" (out) position. For switching modules, it has to be
in the "R" (in) position.
If a switching channel is presently closed (displayed), press OPEN to open it.
Select the amps measurement function by pressing DCI or ACI.
Δ
Use the RANGE and
expected current, or press AUTO to select autoranging (AUTO annunciator turns
on). Details on range are provided in
Apply the current(s) to be measured.
Do not apply more than 3A to the input or the AMPS fuse will blow.
Model 7700 switching module — When performing current measure-
ments, the maximum allowable voltage is 60VDC or 30V RMS.
Exceeding these limits could cause damage to the switching module.
If using a switching module, use the
nel (for the Model 7700, 21, or 22). All other channels will be open.
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.
To measure another amps channel, repeat steps 5 and 6.
When finished, press OPEN if there is a channel closed.
When you have an amps-only channel closed, you cannot select a non-amps
function. For example, if channel 21 of the Model 7700 is closed, you cannot
select the DCV function ("INVALID FUNC" displayed).
H
Model 7700
Switching
Module
L
∇
keys to select a measurement range consistent with the
Section 4.
and keys to close the desired amps chan-
Basic DMM Operation
Figure 3-5. Note that
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