Keithley 2750 User Manual

7-30 Scanning Model 2750 Multimeter/Switch System User’s Manual
Reference
a. ROUTe:SCAN <clist> — Channels will be scanned in the order that they are
listed. The following example shows the proper format for specifying channels in a
scan list for a sequential scan:
ROUT:SCAN (@101:110,201,204,206)
For the above scan list, the scan will run starting with the lowest numbered channel
(101) and then sequence up (forward) to the highest numbered channel (206).
Remote programming can also be used to run non-sequential scans. Any scan list
configured to scan backward is considered a non-sequential scan. The following
examples configure non-sequential scan lists:
Example 1) ROUT:SCAN (@101:105,103,106:110)
Example 2) ROUT:SCAN (@110:101)
Example 1 — After channel 105 is scanned, the unit backs up to scan channel 103,
then proceeds forward to scan channels 106 through 110.
Example 2 — The scan starts with channel 110, then proceeds backward to channel
101.
NOTES Non-sequential scanning is only intended to be performed using remote pro-
gramming. Unexpected results may occur if a non-sequential scan is run from
the front panel.
There must be at least two channels in the scan list. Creating a scan list that has
only one channel will generate error -221 (settings conflict).
Effects of function changes on the scan list
NOTE To avoid unexpected problems with scans (as explained after this note), it
is recommended that the scan list (ROUT:SCAN) be created AFTER scan
channel functions are selected (SENS:FUNC).
Changing from a 2-wire function to a 4-wire function will change the scan list.
This is demonstrated as follows:
The following commands show the proper sequence to configure a simple
20-channel DCV scan using a Model 7700 installed in slot 1:
SENS:FUNC ‘VOLT’,(@101:120) ' Set channels for DCV.
ROUT:SCAN (@101:120) ' Specify scan list.
When the scan is changed to a 4-wire function, the scan list will change. For exam-
ple, assume the above scan is changed to the Ω4 function as follows:
SENS:FUNC ‘FRES’,(@101:110)
2750-900-01.book Page 30 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