User manual

Front panel scanner controls
In addition to the trigger keys discussed previously, front panel keys that affect scanner
card operation include:
and — Allow you to manually step through consecutive internal card chan-
nels.
• OPEN and CLOSE — Let you selectively open and close internal card channels.
• SHIFT-CONFIG — Selects internal or external scanning, scan list, time between
scans, and reading count.
• STEP — Starts a stepping operation of consecutive channels, where output triggers
are sent after every channel closure.
• SCAN — Starts a scanning operation of consecutive channels, where an output trig-
ger is sent at the end of the scan list.
• SHIFT-HALT — Stops stepping or scanning and restores the trigger model to a non-
scanning mode.
Using and keys
The and keys can be used to manually scan through channels on the internal
scanner card. With a scanner card installed in the option slot, press the key to manually
increment channels or the key to manually decrement channels. The annunciator of the
closed channel is lit. Hold down either key to manually scan through channels continuously.
Press OPEN to open all channels.
Using OPEN and CLOSE keys
The OPEN and CLOSE keys control channels on the internal scanner card only. The keys
allow you to directly:
• Close a specific channel (or channel pair for 4-wire resistance).
• Immediately open any internal closed channel (or channel pair for 4-wire resistance).
With a scanner card installed in the option slot of the Model 2000, the following prompt is
displayed when the CLOSE key is pressed:
CLOSE CHAN:01
Use the , , , and keys to display the desired channel (1 to 10) and press EN-
TER. The annunciator of the closed channel will be displayed on the front panel along with
normal readings. Selecting a different channel from the one that is presently closed will
cause the closed channel to open and allow a settling time before closing the selected chan
-
nel.
Channel relays will be closed according to the presently selected function. If a 4-wire
function is selected, both the selected channel relay and the matching relay pair will be
closed. Fixed 4-pole relay pairs are:
• 1 and 6 (not available for Model 2001-TCSCAN)
• 2 and 7
• 3 and 8
• 4 and 9
• 5 and 10
Pressing the OPEN key will immediately open any closed scanner card channel or chan-
nel pair for 4-wire resistance.
2000-900 (J - Aug 2010) BOOK.fm Page 23 Wednesday, October 12, 2011 12:29 PM