Scan operations
The Model 2016 can be used with external scanner card installed in switching mainframes
such as the Models 707, 7001, and 7002. The following paragraphs discuss various aspects of
using scanning with the Model 2016.
Scanning overview
A scanner lets you switch among a number of input signals to the Model 2016 for measurement.
Refer to the documentation supplied with the scanner card for specific connection information.
When using external channels, the switching mainframe controls the opening and closing of
individual channels. To synchronize Model 2016 measurements with external channel closures,
connect the Trigger Link lines of the multimeter and switching mainframe. Refer to “Trigger
operations” earlier in this section for details and an example on using external triggering.
Front panel scanner controls
In addition to the trigger keys discussed previously, front panel keys that affect scanner card
operation include:
• SHIFT-CONFIG — Selects scan list, time between scans, and reading count.
• STEP — Starts a stepping operation of consecutive channels, where output triggers are
sent after every channel closure.
• SCAN — Starts a scanning operation of consecutive channels, where an output trigger
is sent at the end of the scan list.
• SHIFT-HALT — Stops stepping or scanning and restores the trigger model to a non-
scanning mode.
Stepping and scanning trigger model additions
The trigger model presented in “Trigger operations” earlier in this section has some addi-
tional capabilities when stepping or scanning. These are outlined below:
• Timer — With this control source, event detection is immediately satisfied on the initial
pass. Each subsequent detection is satisfied when the programmed timer interval (up to
99H:99M:99.99S) elapses.
• Reading counter — For both stepping and scanning, the reading count can be entered
from SHIFT-CONFIG. (This is referred to as the trigger counter over the bus.) The read-
ing counter can bypass the idle state. Operation will wait until the programmed control
source event occurs.
• Channel counter — For scanning, the scan list length (maximum channel less minimum
channel) is used to bypass the control source allowing a specified number of device
actions to occur. (This counter is referred to as the sample counter over the bus.)
Measurement Options 3-21
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