Keithley 2750 User Manual

2-12 Close/Open Switching Module Channels Model 2750 Multimeter/Switch System User’s Manual
c. ROUTe:CLOSe?
This query command returns a <clist> of closed measurement channels, including
paired channels for 4-wire functions.
This query command will not return non-measurement channels, such as
backplane isolation channels and the pole-mode channel.
d. ROUTe:OPEN:ALL
This command functions the same as the front panel OPEN key (ALL menu
option). It simply opens all channels (including non-measurement channels)
installed in the mainframe.
Remote programming example (system channel operation)
The following example assumes a Model 7700 installed in slot 1, and the Ω4 function of
the Model 2750 is selected. This command sequence connects channel 101 and its paired
channel (111) to DMM Input and Sense as shown in Figure 2-2.
ROUT:OPEN:ALL ' Open all channels.
ROUT:CLOS (@101) ' Close channels 101, 111, 123,
' 124 and 125.
Non-amp and non-measure switching modules
There are Keithley switching modules that do not support current measurements and there
are modules that do not support any measurements at all.
Non-amps module — With an amps function selected (DCI or ACI), system channel oper-
ation cannot be used to close channels on that module.
Non-measure module — For front panel operation, system channel operation cannot be
used to close channels. For remote programming, system channel operation can be used,
but only the one specified channel will close. All other channels on the module will open.
Non-amps switching modules
NOTE Presently, non-amps Keithley modules include the Models 7701, 7703, 7706,
7707, 7708, and 7709. You can check the Keithley website (www.keithley.com)
for new modules.
A non-amp module does not support amps measurements. System channel operation can-
not 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 ' Restores system preset defaults.
SENS:FUNC ‘CURR:DC’ ' Selects DCI function.
ROUT:CLOS (@101) ' Attempts to close system channel 101 – Generates
' error -222.
2750-900-01.book Page 12 Wednesday, August 3, 2011 7:56 AM

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A