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7-22
5.
klqb
6.
Buffer
To recall scanned readings stored in the buffer, press RECALL and use the
and
instrument is storing readings. See
finished, make sure to exit from buffer recall by pressing the EXIT key.
klqb
Manual/external trigger scan
The only difference between a manual/external trigger scan and the basic scan is control.
The basic scan runs as soon as the STEP or SCAN key is pressed. The manual/external
trigger scan is controlled by the front panel TRIG key or by triggers received from another
instrument.
klqb
1.
2.
3.
With reading count set to infinite, the scan will keep repeating.
While the scan is enabled (STEP or SCAN annunciator on), most front panel
keys are inoperative and will cause the message "HALT SCANNER" to be
displayed.
To disable the scan, press SHIFT and then HALT.
keys to navigate through the buffer. Note that the buffer can be read while the
Channels for an advanced scan can be configured using different mX+ B units
(i.e., ° and Ω), temperature sensors (i.e., 4-wire RTD and thermistor), and
measurement type (i.e., OCOMP ohms and DCV).
However, when readings are recalled from the buffer, the display may not indi-
cate the correct mX+ B units symbol or annunciator for each channel. For
example, assume one channel used OCOMP ohms, while a second used Ω2.
When the readings are recalled, the OCOMP annunciator may remain on for
both channels.
This display anomaly is due to memory limitations. Preserving the mX+ B units
and annunciators for each channel would reduce the number of readings that
could be stored in the buffer.
For the following procedure, the Model 2790 can be triggered by pressing the
TRIG key or by receiving a trigger pulse from another instrument.
vides details on triggering.
If the scanner is presently enabled (STEP or SCAN annunciator on), press SHIFT
and then HALT to disable it.
Press the EX TRIG to place the instrument in the external triggering mode. The
TRIG annunciator turns on and the reading is blanked (-------).
Press STEP or SCAN to enable the scan (STEP or SCAN annunciator turns on).
Model 2790 SourceMeter
Section 6
for details on recalling buffer readings. When
®
Switch System Reference Manual
,
Section 8
,
,
pro-
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