Keithley 2701 User Manual page 238

7-12 Scanning
There are two scan configurations: simple and advanced. When you configure the simple
scan, the instrument uses the present instrument setup for each channel in the scan. For the
advanced scan, each channel can have its own unique setup. As explained in
models," page
simple and advanced scan.
Channel setup considerations
Rel — In order to use an acquired rel value for an advanced scan channel, the rel value has
to be acquired with the instrument in the normal measurement state. Details to set rel for
scan channels are provided in
remote programming) at the end of this section demonstrate how to set rel values for scan
channels.
Filter — The moving filter cannot be used in a scan; only the repeat filter can be used. If
you configure a channel (or channels) to use the moving filter, the filter will be off when
the scan is run. See
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.
NOTE
Saving the configured scan
The configured scan can be saved in a user-saved setup (SAV0, SAV1, SAV2, SAV3, or
SAV4). 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 factory
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 7700 module configured for a10-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, and SAV1 is the power-on default. After cycling
power, 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 during the setup process.
NOTE
7-4, there is a user-set delay (auto or manual) that is in effect for both the
"Relative," page
Section 4 for details on filter.
When in the scan setup menu, use the edit keys ( , , , and ) to make
selections and set values. Displayed selections and settings are entered by
pressing the ENTER key.
Saving and recalling user-setups is covered in Section 1 (see
setups" on page 1-22).
Model 2701 User's Manual
5-2. Scanning examples (front panel and
"Trigger
"Defaults and user