Keithley 2790, Reference Manual, Page: 218 / 568

Model 2790 SourceMeter
®
Switch System Reference Manual 7-13
Hold
— Reading hold cannot be used with scanning. Do not set up a scan channel to use
hold and do not run a scan with hold enabled.
klqb
When in the scan setup menu, use the edit keys ( , , , and ) to make
selections and set values. Displayed selections and settings are entered by press-
ing the ENTER key.
Saving the configured scan
The configured scan can be saved in a user-saved setup (SAV0, SAV1, SAV2, or SAV3).
For a front panel configured scan, the reading count and timer values are also saved (B04
and later software). However, if the settings for a user setup or power-on setup do not
match the switching module type presently installed, error +520 (Saved setup scancard
mismatch) occurs when the setup is recalled. The scan resets to the factor default settings
and all channels will open. The saved setup is still retained in memory and can be restored
when the matching switching module is later installed.
The displayed front panel CONFIG menu operates differently from other menus when a
saved front panel scan is recalled. The reading count value in the menu may not reflect the
actual reading count of the scan. For example:
Assume a Model 7702 module configured for a 10-channel scan and a reading count of 30.
For this configuration, the instrument will scan through the scan list three times. Now
assume the scan setup is saved in SAV1. After cycling power, select the SAV1 setup and
press SCAN or STEP to run the scan. The scan will run properly. That is, the 10 channels
will be scanned three times. However, if you check the reading count in the front panel
CONFIG menu, the reading count will be 10 (instead of 30). This is because the scan list
length “suggests” the reading count value of 10 during the setup process based on the
length of the scan list.
klqb
Saving and recalling user-setups is covered in Section 1 (see “Defaults and user
setups” on page 1-18 ).
Scan reset
From the scan configuration menu, you can reset the scan configuration to the default
setup for a simple scan.
For the Model 7702 switching module, channels 41 and 42 are turned off (not used) and
channels 1 through 40 are configured as follows:
Function - DCV
Range - Auto
Rate - Slow
All other multimeter features and functions are disabled.