Front Panel Operation
3-95
however, that you cannot close or open external channels us-
ing Model 2001 controls. Use the switching mainframe con-
trols to open and close individual channels.
In order to synchronize Model 2001 measurements with ex-
ternal channel closure, connect the Model 2001 external trig-
ger inputs or the trigger link to the external switching
mainframe trigger inputs and outputs. Refer to paragraphs
3.7.6 and 3.7.7 for information on using external triggering
and the trigger link.
3.11.2 Front panel scanner controls
Controls that affect scanner card operation include:
• CHAN: Allows you to open and close internal scanner
card channels.
• CONFIG-CHAN: Defines the measurement functions
for each internal and external scanner card channel, se-
lects the number of external channels, defines channels
assigned to the internal scan list, and saves/restores an
alternate measurement function.
• CONFIG-SCAN: Selects internal or external scanning
and controls ratio/delta operation when using the inter-
nal scanner.
• SCAN: Starts/stops scanning using the selected scan
list. Configures scan count, scan interval, and enables
buffer storage and recall if internal or external list is se-
lected.
• EXIT: Disables scanning and returns to normal opera-
tion. (Trigger model is restored to pre-scanning config-
uration.)
• and : Allows you to manually scan through
channels.
• PREV/NEXT DISPLAY: Allows you to display the two
adjacent channels (manual scanning only).
3.11.3 Using CHAN to close and open internal
channels
CHAN key operation
The CHAN key controls channels on the internal scanner
card only. The CHAN key allows you to directly:
• Close a specific channel (or channel pair for 4-wire
functions).
• Immediately open any internal closed channel (or chan-
nel pair for 4-wire functions).
Channel selection menu
Table 3-39 summarizes the channel selection menu structure
along with a brief description of each item. More detailed de-
scriptions of these menu items are presented in the following
paragraphs. See paragraph 3.3 for general rules on navigat-
ing menus.
Pressing CHAN will display the following menu choices:
CHANNEL SELECTION
CLOSE-CHANNEL OPEN-ALL-CHANNELS
CLOSE-CHANNEL:
Selecting CLOSE-CHANNEL will
display the following message prompting you to select the
channel to close:
ENTER CHAN#01 (1-10)
The field entry after “ENTER CHAN#” indicates the chan-
nel to close. To close a channel, simply use the cursor and
range keys to select the number of the channel to close, then
press ENTER. The number of the closed channel will be dis-
played 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 set-
tling time before closing the selected channel.
Channel relays will be closed according to the presently se-
lected function. If a 2-wire function is used, only the relay for
that one channel will be closed. If a 4-wire function is select-
ed, both the selected channel relay and the matching relay
pair will close. For example, closing the matching relay pair
will close. For example, closing channel 2 will also close the
channel 7 relay. Fixed 4-pole relay pairs are:
• 1 and 6
• 2 and 7
• 3 and 8
• 4 and 8
• 5 and 10.
Table 3-39
CHANNEL SELECTION menu structure
Menu item Description
CLOSE-CHANNEL
ENTER CHAN#01
(1-10)
OPEN-ALL-CHANNELS
Close channel menu:
Use cursor, range, and
ENTER keys.
Press ENTER to open closed
channel(s).
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