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Model 2790 SourceMeter
Model 7702 switching module
Connections for the 7702 switching module are shown in
channels 41 and 42 can be used for current measurements.
Figure 3-5
DCI and ACI connections using Model 7702 switching module
Current
Source
Amps measurement procedure
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1.
2.
3.
4.
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5.
6.
7.
8.
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Switch System Reference Manual
H
CH 41 or 42
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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.
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 7702 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 7702 switching module, use the
amps channel (41 or 42). 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 (ALL) 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 41 of the 7702 module is closed, you cannot
select the DCV function ("INVALID FUNC" displayed).
CAUTION Maximum input: 60VDC or
Model 7702
Switching
Module
keys to select a measurement range consistent with the
Section
4.
and
Figure
3-5. Note that only
30V RMS, 3A switched, 60W,
125VA maximum
keys to close the desired
3-15
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