Channel Assignments; System Channel Operation - Keithley 7701 User Manual

Channel assignments

The Model 2700 has two slots for switching modules and the Model 2750 has five slots. To control the appropriate switching
module, the slot number must be included with the switching module channel number when you specify a channel. The chan-
nel assignment is formatted as follows:
SCH where: S is the slot number
Examples:
101 = Slot 1, Channel 1
210 = Slot 2, Channel 10
506 = Slot 5, Channel 6 (Model 2750)
NOTE For remote operation, the 3-digit channel assignment is included in the channel list parameter for
the commands.

System channel operation

System channel operation is used to connect measurement channels to the Model 27xx DMM. With 2-wire function selected,
system channels 1 through 32 can be closed. When one of these channels is closed, channel 35 automatically closes to connect
the measurement channel to the DMM Input.
With a 4-wire function selected, system channels 1 through 16 can be closed. When one of these channels is closed, its paired
channel closes, and the backplane relays for sense and input (channels 34 and 35) also close.
For a 4-wire function, channels are paired as follows:
CH1 and CH17
CH2 and CH18
CH3 and CH19
CH4 and CH20
System channel operation for the Model 7701 is summarized as follows:
• The / keys on the Model 27xx DMM can be used to close a system channel.
• The CLOSE key can be used to close a system channel. For the Model 2701/2750 and later versions of the
Model 2700, use the SINGLE option of the CLOSE key.
• Use the OPEN key to open all channels in the test system. For the Model 2701/2750 and later versions of the
Model 2700, use the ALL option of the OPEN key.
• For remote operation, the following commands are used for system channel operation:
ROUT:CLOS <clist>
ROUT:CLOS?
ROUT:CLOS:STAT? <clist>
ROUT:OPEN:ALL
Common-side (CSID) 4-wire ohms
The Model 7701 can be configured to use a common bus to perform 4-wire ohms measurements on up to 32 DUT. Details of
CSID operation is provided in the application for
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
CH is the channel number
CH5 and CH21 CH9 and CH25
CH6 and CH22 CH10 and CH26
CH7 and CH23 CH11 and CH27
CH8 and CH24 CH12 and CH28
Common-side 4-wire ohms measurements on page
CH13 and CH29
CH14 and CH30
CH15 and CH31
CH16 and CH32
Close specified system channel.
Returns the closed system channel.
Query closed channels in list (1 = closed).
Open all channels.
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