Keithley 7001, Instruction Manual, Page: 59 / 353

Front Panel Operation
4-10
4.5.2 Channel list and scan list
The Model 7001 can perform two basic operations; it
can close and open a list of channels, and it can scan
through a list of channels. The following paragraphs
explain how to enter channels for these operations. The
basic operations are explained in paragraphs 4.5.3
(Closing and Opening Channels) and 4.5.4 (Scanning
Channels).
Each operation has its own list. For basic close/open
operation, channels are entered into a channel list. For
scan operation, channels are entered into a scan list. In
general, press EXIT to select the channel status display
(if not already displayed as shown in Figure 4-2) and
press SCAN LIST to toggle between the channel list
and scan list.
A programmed CHANNEL for the mainframe consists
of the slot number and the card channel. Slot and card
channel are separated by an exclamation point (!). For
a matrix card, the card channel consists of a row and
column that are also separated by an exclamation point
(!). Individual CHANNELS in the defined list are sepa-
rated by a comma (,). A range of CHANNELS is sepa-
rated by a hyphen (-). A channel pattern stored in
memory is designated by the letter “M” followed by
the memory location number. Finally, the list is termi-
nated by a comma (,).
For basic close/open operation, the order of channels
in the channel list is not important since all listed chan-
nels will either close or open at the same time. For scan
operation, the order of channels is important. Channels
will be scanned in the order that they are presented in
the scan list.
The Scan List is not lost (cleared) after the instrument
is turned off. However, the Scan List is cleared if any of
the following events occur:
1. A channel in the Scan List becomes unavailable. A
channel can become unavailable by changing a slot
assignment (Card TYPE) or by changing to a pole
mode that reduces the number of available chan-
nels.
2. A channel in the Scan List becomes restricted. A
channel becomes restricted by adding it to the re-
stricted channel list.
The following examples demonstrate how the Scan
List is lost:
1. Assume the Scan List includes channel 1!21 and
the assignment for slot 1 is changed to a multiplex-
er card that has only 20 channels. Since channel
1!21 no longer exits, the entire Scan List is cleared.
2. Assume the Scan List includes channel 1!1 and the
assignment for slot 1 is changed to a matrix card.
Since channel 1!1 is an incorrect format for a matrix
card, it no longer exists. The enire Scan List is
cleared.
3. Assume the Scan List includes channel 1!21 and
the slot (slot 1) is configured for 2-pole operation.
Changing the pole-mode of slot 1 to 4-pole opera-
tion makes channel 1!21 unavailable and clears the
entire Scan List.
4. Assume Channel Pattern M1 is included in the
Scan List and M1 includes channel 1!1 as a closed
channel. If channel 1!1 becomes unavailable, the
entire Scan List is cleared. Also note that Channel
Pattern M1 is also cleared (see paragraph 4.5.5).
5. Assume the Scan List includes channel 1!1. If chan-
nel 1!1 is then added to the restricted channel list,
the entire Scan List is cleared.
6. Assume the Scan List includes channel 1!1 and
Card Pair is enabled. Note that with card pair en-
abled, channel 2!1 is indirectly included in the Scan
List. If cahnnel 2!1 is then added as a restricted
channel, the entire Scan List will clear since one of
its channels has become restricted.
Perform the following steps to create a channel list or
scan list:
Step 1. Select display mode.
1. If you are entering a list of channels for basic close
and open operation, make sure the instrument is in
the channel list display state (see Figure 4-1A) with
the following message prompt displayed:
SELECT CHANNELS
The Model 7001 powers-up to this state. The SCAN
LIST key toggles between the channel list and the
scan list.
2. If you are entering a list of channels for scan oper-
ation, display the scan list:
SCAN CHANNELS
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