Keithley 2750, User Manual, Page: 222 / 452

Model 2750 Multimeter/Switch System User’s Manual Scanning 7-17
Step 3: Enable immediate scan
The present state of immediate scan (IMM SCAN) is displayed; Y (yes, which is the fac-
tory and *RST default) or N (no). With immediate scan enabled, the scan will start when
you press the STEP or SCAN key. Use the
Δ
or
∇
key to display IMM SCAN: Y, and
press ENTER.
NOTE
Disable immediate scan (IMM SCAN: N) when you wish to use a monitored
reading limit to trigger the start of the scan. This technique to start a scan is
covered later in this section. See
“Scan operation,” page 7-21 .
Step 4: Timer controlled scan
The present state of the TIMER will be displayed; OFF or ON. If you do not wish to use
the timer, use the
Δ
or
∇
key to display TIMER? OFF (which is the factory and *RST
default) and press ENTER.
To use the timer, use the
Δ
or
∇
key to display TIMER? ON and press ENTER. The
timer interval is displayed in the hour/minute/second format. The timer can be set from
0.001 sec (00H:00M:00.001S) to 99 hr, 99 min, 99.999 sec (99H:99M:99.999S). Note that
pressing the AUTO key sets the timer to 0.001 sec. With the desired interval displayed,
press ENTER.
Step 5: Set the reading count
The displayed reading count (RDG CT) sets the number channels to scan (STEP) or the
number of scans to run (SCAN). You can change the reading count to any finite value from
2 to 110000, or you can select infinite (continuous scanning). To select infinite, set the
reading count to 00000 to display INF. With the desired reading count setting displayed,
press ENTER. The instrument returns to the normal measurement mode.
See “Trigger models,” page 7-4 , for details on reading count.
Setting delay
As shown in Figure 7-1 and Figure 7-2 , a Delay (Auto or Manual) can be set by the user.
With auto delay selected, the delay period depends on function and range ( Table 8-1 ).
With manual delay selected, the delay period can be set from 0 secs to 99 hrs, 99 mins,
99.999 secs.
Perform the following steps to set auto or manual delay:
1. With the instrument in the normal measurement display state, press SHIFT and
then DELAY.
2. Press
Δ
or
∇
to display AUTO (auto delay) or MAN (manual delay) and press
ENTER.
3. If you selected MAN, you will be prompted to set the delay in the hour/minute/sec-
ond time format. Use the
, ,
Δ
, and
∇
keys to set the delay.
2750-900-01.book Page 17 Wednesday, August 3, 2011 7:56 AM