Taking Readings With The Scanner Card - Keithley 2002 Getting Started Manual

3-26 IEEE-488 Bus Operation

Taking readings with the scanner card

The Model 2001-SCAN is an optional 10-channel scanner card for the Model 2002 Multim-
eter. Only one channel can be closed at a time. If you close a channel while another is already
closed, the first one opens with break-before-make operation.
You can use the scanner card two ways. One is to issue a command to close a particular chan-
nel before sending other commands to take readings. The other way is to program the scan list,
and let the meter take care of closing a channel before taking a reading. There is a fundamental
difference in the instrument's behavior in these two approaches.
In the scan list, a measurement function is bound to each channel, so that when the next chan-
nel in the list closes, the meter switches to the associated function. Simply sending a channel
close command, however, does not change the measurement function. While using the scan list,
the meter responds to a trigger by first going to the next channel in the list, then switching to the
function bound to that channel, before taking a reading.
The following example program measures DC volts on channel 1, AC volts on channel 2, and
2-wire resistance on channel 3, using the command.
ROUTe:CLOSe