Scanning Channels - Keithley 7001 Instruction Manual

Perform the following steps to close and open channels:
NOTE
Before performing any close/open op-
erations, make sure the switching
cards you are using are properly con-
figured. The CARD CONFIG MENU
is used to configure various aspects of
operation for the installed card(s). See
paragraph 4.7 for details.
Step 1. Place instrument in channel list display state.
If the Model 7001 is not in the channel list display state,
press EXIT and/or SCAN LIST until the following
message prompt is displayed:
SELECT CHANNELS
Step 2. Enter channel list.
Enter the channels to be closed/opened as explained in
paragraph 4.5.2. The following example demonstrates
proper format:
SELECT CHANNELS 1!1, 1!2, 2!1-2!5, M1,
The above channel list includes channels 1 and 2 of slot
1, channels 1 through 5 of slot 2, and whatever channel
pattern is stored in memory location 1 (M1).
Step 3. Close (or open) listed channels.
Perform the appropriate close/open operation as follows:
1. To close the listed channels, press the CLOSE key.
The "dashes" on the channel status display will in-
dicate the closed channels.
2. To open the listed channels that are currently
closed, press OPEN. Note that only the listed chan-
nels will open. Any channels that are closed, but
not included in the list, will not open when OPEN
is pressed. To open unlisted channels, you must
press OPEN ALL.
Note: The OPEN and CLOSE keys are only functional
while in the normal channel display state. The OPEN
ALL key is functional at all times no matter what is cur-
rently being displayed.
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Summary of close/open keys:
CLOSE  Close channels defined in channel list.
OPEN  Open channels defined in channel list.
OPEN ALL  Open all closed channels.
4.5.4

Scanning channels

The Model 7001 can scan through a specified list of
channels. The order that the channels are presented in
the scan list determine the channel order for the scan.
Scan process (Trigger Model)
The following information describes front panel con-
trol of the scan process. The flowchart (Trigger Model)
in Figure 4-8 summarizes scan operation from the front
panel.
Idle
The instrument is considered to be in the idle state
whenever it is not operating within one of the layers of
the Trigger Model. The front panel ARM indicator is off
when the instrument is in the idle state. While in the
idle state, the instrument cannot perform a scan.
From the front panel, the Model 7001 is taken out of the
idle state by pressing the STEP key. When not in the
idle state (ARM indicator on) the scanning function is
considered to be enabled.
A scan can be aborted at any time by pressing the
OPEN ALL key. The Model 7001 will return to the idle
state.
Once the instrument is taken out of the idle state, oper-
ation proceeds into the arm layer of the Trigger Model.
Front Panel Operation
4-13