Keithley 2002, User Manual

Page: 95 / 366

Front Panel Operation
2-78
2.11.3 Using CHAN key to close and open internal
channels
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 2-38 summarizes the channel selection menu structure
along with a brief description of each item. More detailed
descriptions of these menu items are presented in the follow-
ing paragraphs. See paragraph 2.3.4 for general rules on nav-
igating menus.
With a scanner card installed in the option slot of the Model
2002, the following options are available when CHAN is
pressed:
CLOSE-CHANNEL:
This menu item prompts you to enter
the channel (from 1 to 10) that you wish to close. Use the
cursor keys (
and ) and the RANGE
▲
and
▼
keys to
display the channel and press ENTER. The number 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 set-
tling time before closing the selected channel.
Channel relays will be closed according to the presently
selected function. If a 2-wire function is used, only the relay
for that one channel will be closed. If a 4-wire function is
selected, both the selected channel relay and 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 (not available for Model 2001-TCSCAN)
• 2 and 7
• 3 and 8
• 4 and 8
• 5 and 10.
OPEN-ALL-CHANNELS:
Selecting OPEN-ALL-CHAN-
NELS will immediately open any closed scanner card chan-
nels or channel pair for 4-wire functions.
Table 2-38
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).
Note: This menu is only available with a scanner card installed.