Keithley 2750, User Manual, Page: 69 / 452

2-14 Close/Open Switching Module Channels Model 2750 Multimeter/Switch System User’s Manual
Making amps measurements — In order to perform amps measurements, you must use
the front panel inputs of the 2701 mainframe. You can still use the non-amps module for
other aspects of the test, but you must use multiple channel operation to close channels.
Example:
NOTE
In order to use the front panel inputs, make sure the INPUT switch is in the out
(F) position.
SYST:PRES ' Restores system preset defaults.
ROUT:MULT:CLOS (@101) ' Closes channel 101.
SENS:FUNC ‘CURR:DC’ ' Selects DCI function – Legal operation.
Non-measure switching modules
NOTE
Presently, non-measure Keithley modules include the Models 7705, 7711, and
7712. You can check the Keithley website (www.keithley.com) for new modules.
Keep the following in mind when using a non-measure module:
• For a non-measure card, no channels are connected to the internal DMM (the
channels cannot be connected to the backplane).
• Multiple channel operation should be used to close channels on a non-measure
module. For remote operation, the ROUT:MULT commands are used to close
channels.
• Front panel system (single) channel operation cannot be used to close channels on
a non-measure module. For front panel operation, system channel operation will
cause message “NO MEAS CARD” to be displayed.
• A non-measure module may have open/close operations that are specific only to
that module. Refer to the appropriate module manual (packing list) for details on
operation.
• In order to perform measurements, you must use the front panel inputs of the 2701
mainframe. You can still use the non-measure module to control other operations.
Multiple channel operation
The capability to individually control channels provides you with added flexibility in how
you use a switching module. For example, assume you want to route a signal into channel
1 and out channel 20 of a Model 7700 switching module. You would do this by closing
channels 1, 20, and 23. If you open channels 24 and 25, you will isolate the input signal
from the DMM of Model 2750.
Multiple channel operation allows any channel (or channels) in the test system to be
closed or opened. It allows more than one measurement channel to be closed at the same
time. It also allows individual control of non-measurement channels, such as backplane
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