Keithley 2700, User Manual, Page: 227 / 500

7-14 Scanning Model 2700 Multimeter/Switch System User’s Manual
7. If you enabled the timer, set the timer interval using the hour/minute/second
format. The timer can be set from 0.001 sec (00H:00M:00.001S) to 99 hrs, 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.
8. The displayed reading count (RDG CNT) sets the number of 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 55000, or you can select infinite (continuous
scanning). To select infinite, set the reading count to 000000 to display INF. See
“Trigger models,” page 7-4 , for details on reading count. With the desired reading
count setting displayed, press ENTER to return to the normal measurement display
state.
Advanced scan
For an advanced scan, each enabled channel can have its own unique setup. Channels that
are disabled are excluded from the scan list.
When you enter the channel setup menu, the displayed information indicates the present
setup for the selected channel. The position of the decimal point in the “SETUP” message
indicates present range. Examples:
S.ETUP V:101 1V range for channel 101. If the AC annunciator is off, the function
is DCV. If it is on, ACV is selected.
SE.TUP K
Ω
:102 10k
Ω
range for channel 102. If the 4-wire annunciator is off, the
function is
Ω
2. If it is on,
Ω
4 is selected.
SET.UP mA:121 100mA range for channel 121. If the AC annunciator is off, the
function is DCI. If it is on, ACI is selected.
SETUP °C:103 TEMP function selected for channel 103.
SETUP HZ:104 FREQ function selected for channel 104.
SETUP S:105 PERIOD function selected for channel 105.
SETUP PR:111 For the Model 7700, channel 111 is paired to channel 101, and
cannot be changed. Channel pairing occurs when Ratio or Channel
Average is enabled, or when a 4-wire function (
Ω
4 or 4-wire RTD
TEMP) is selected.
The annunciators indicate which of the other instrument settings are enabled for the
selected channel. When you edit settings for the selected channel (auto range, rel, rate,
etc.), the related annunciators will turn on/off.