Front Panel Operation
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2.11.7 Starting and stopping scanning
Internal and external scanning
After an internal or external scan is configured, pressing the
ENTER key from the SCAN menu starts scanning. Pressing
the EXIT key disables scanning. An internal or external scan
cannot be temporarily disabled.
Ratio/delta measurements
After ratio or delta measurements are selected from the
SCAN OPERATION menu, the SCAN, TRIG, and EXIT
keys control scanning. Press the SCAN key to start the oper-
ation, as shown in Figure 2-33.
Manual scanning
When using internal scanning, you can manually scan chan-
nels by pressing the or keys. To use this feature, first
close a channel by using the CLOSE-CHANNEL option
accessible with the CHAN key. Use to increment chan-
nels, or use to decrement channels. Hold down either key
to continuously scan through channels manually.
Adjacent channel display
The multiple display mode can be used to display the two
adjacent channels only when manually controlling channels.
To use this feature, first manually close the desired channel,
then press PREV to display alternate channels. You can then
use the and keys to scroll through channel displays
normally.
NOTE
The adjacent channel display mode cannot
be used when scanning channels automat-
ically using the internal or external scan
list.
As an example, assume that you close channel 5 using the
CHAN key. With the multiple display enabled, channels 4
and 6 will appear on the lower display line.
2.11.8 Scanner operation examples
The following paragraphs give step-by-step procedures for
various scanner operating modes.
Closing and opening channels
Use the front panel CHAN key to close and open specific
channels on the internal scanner card as follows:
1. From normal display, press the CHAN key. The instru-
ment will display the following menu:
CHANNEL SELECTION
CLOSE-CHANNEL OPEN-ALL-CHANNELS
2. Select CLOSE-CHANNEL, then press ENTER. The
Model 2002 will display the following prompt:
ENTER CHANNEL# 01 (1-10)
3. Use the cursor and range keys to select the channel you
wish to close (1-10), then press ENTER. Any previously
closed channel will open, and the selected channel will
close.
4. To open the close channel, select OPEN-ALL-CHAN-
NELS in the CHANNEL SELECTION menu, then
press ENTER.
Manual scanning and using the multiple display
The and keys can be used to manually scan through
channels on the internal scanner card. The multiple display
mode can also be used to display adjacent scanner channels
while scanning manually.
NOTE
Adjacent channel display cannot be used
when the instrument is scanning
automatically.
Follow the steps below to scan manually and display alter-
nate channels.
1. Manually close a channel by using the CLOSE-
CHANNEL selection accessible with the CHAN key.
2. Press the key to manually increment channels, or
press the key to manually decrement channels. Hold
down either key to manually scan through channels con-
SCAN
TRIGGERS HALTED
Use SCAN key to resume: EXIT to quit
SCAN or TRIG Ratio or delta measurements
SCAN TRIGGERS HALTED
Use SCAN key to resume: EXIT to quit
EXIT SCANNING DISABLED
Use SCAN key to resume
EXIT SCANNING DISABLED
Use SCAN key to resume
Figure 2-33
SCAN key menu structure for ratio and delta
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