Close/Open Overview - Keithley 2701 User Manual

2-2 Close/Open Switching Module Channels

Close/open overview

NOTE
NOTE
There are two modes of close/open operation:
•
•
CAUTION
WARNING
For remote operations, you can use the internal web page of the Model 2701 to
send commands, queries, and take readings. See "Internal web page" in
Section 10 for details.
This section covers basic close/open operations for switching module channels.
It also covers the operating characteristics that are unique to the Model 7700
switching module.
System channel operation — This is the mode of operation that should be used
exclusively by most (if not all) users. When you close an input channel (or chan-
nel-pair), other channels on the switching module close automatically to internally
connect it the DMM of the Model 2701.
Multiple channel operation — This mode of operation provides additional flexibility
by providing individual control of each switching module channel. However, careless
operation could create a safety hazard and/or damage the switching module and other
equipment. Multiple channel operation should only be used by experienced test
engineers.
To prevent damage to a switching module, do not exceed the maximum
signal level input for that module. Most switching modules are rated for
303V. The following command queries maximum module voltage:
SYSTem:CARDx:VMAX?
For system channel operation, the instrument will display the
"OVERFLOW" message when the maximum allowable voltage for the
module is being exceeded.
However, for multiple channel operation, the "OVERFLOW" message
will not occur until the maximum voltage of the mainframe (not module) is
exceeded. Therefore, the "OVERFLOW" message would occur only if
1010V is exceed.
Careless multiple channel operation could create an electric shock hazard
that could result in severe injury or death. Improper operation can also cause
damage to the switching modules and external circuitry. Multiple channel
operation should be restricted to experienced test engineers who recognize
the dangers associated with multiple channel closures.
Model 2701 User's Manual
'Request maximum allowable voltage for
'CARDx (where x is the slot number for
'the module).