Multiple Channel Operation - Keithley 7701 User Manual

Amps measurements
The 7701 module does not support amps measurements. System channel operation cannot be used to close channels while an
amps function (DCI or ICI) is selected.
If an amps function (DCI or ACI) is selected and you attempt to close a system channel, the message "NO AMPS CHAN" will
be displayed briefly. For remote programming, error -222 (Parameter data out of range) is generated. Example:
SYST:PRES
SENS:FUNC 'CURR:DC'
ROUT:CLOS (@101)
If a system channel is already closed and you attempt to select the DCI or ACI function, the message "INVALID FUNC" will
be displayed briefly. For remote programming, error -221 (Settings conflict) is generated. Example:
SYST:PRES
ROUT:CLOS (@101)
SENS:FUNC 'CURR:DC'
Making amps measurements – In order to perform amps measurements, you must use the front panel inputs of the 27xx
mainframe. You can still use the 7701 module for other aspects of the test (such as controlling a bias supply for DUT), 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
ROUT:MULT:CLOS (@101)
SENS:FUNC 'CURR:DC'

Multiple channel operation

WARNING Multiple channel operation should only be performed by experienced test engineers who
recognize the dangers associated with multiple channel closures.
Multiple channel operation provides independent control of switching module channels (1 through 35). When you close or
open a multiple channel, only the specified channel (or channels) will close or open. Other closed or open channels are not
affected.
Multiple channel operation for the Model 7701 is summarized as follows:
• For earlier versions of the Model 2700, multiple channel operation is not available from the front panel (remote
operation only).
• For the Model 2701/2750 and later versions of the Model 2700, the MULTI option of the CLOSE key can be used
to close a channel.
• For the Model 2701/2750 and later versions of the Model 2700, the MULTI option of the OPEN key can be used to
open a channel. The ALL option of the OPEN key opens all channels.
ROUT:MULT:CLOS <clist>
ROUT:MULT:OPEN <clist>
ROUT:MULT:CLOS?
ROUT:MULT:CLOS:STAT? <clist>
You can also use the following command to open all channels:
ROUT:OPEN:ALL
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' Restores system preset defaults.
' Selects DCI function.
' Attempts to close system channel 101 – Generates error -222.
' Restores system preset defaults.
' Close system channel 101.
' Attempts to select DCI function – Generates error -221.
' Restores system preset defaults.
' Closes channel 101.
' Selects DCI function – Legal operation.
Close specified channels (unlisted channels not affected).
Open specified channels (unlisted channels not affected).
Returns list of all closed channels.
Query closed channels in list (1 = closed).
Open all channels.