Calculate Multiple Display; Scanning; Scanning Overview; Front Panel Scanner Controls - Keithley 2002 User Manual

2.10.5 Calculate multiple display

One of the multiple displays lets you view the reading on the
bottom line of the display and the result of the calculation on
the top line. This display is available by repeatedly pressing
either the NEXT or PREVious DISPLAY key to scroll
through the multiple displays for the particular function. The
following is a typical message for a percentage calculation:
-7.0431e+01 VDC %
Reading = -0.704311
The display resolution on the bottom line follows that chosen
for the top line. If scientific notation is required on the top
line, it is fixed at 4.5 digits. The value on the bottom line
tracks the units and prefix of the top line. (For example, if the
top line displays µA, then the units on the bottom line are
µA.)
Note that this multiple display is not available on the fre-
quency function.

2.11 Scanning

The Model 2002 can be used with an internal scanner card
(Model 2001-SCAN or 2001-TCSCAN) or with external
scanner cards installed in switching mainframes such as the
Models 706, 7001 and 7002. The following paragraphs dis-
cuss various aspects of using scanning with the Model 2002.

2.11.1 Scanning overview

A scanner allows you to switch among a number of input sig-
nals to the Model 2002 for measurement. The channel con-
trol and scanning capabilities depend on whether an internal
or external scanner card is being used, as well as on the capa-
bilities of the scanner card in question. Refer to the docu-
mentation supplied with the scanner card for specific
connection information.
Using an internal scanner card
The optional Model 2001-SCAN scanner card allows you to
switch or scan up to ten 2-pole channels, or five 4-pole chan-
nels. Two of the channels use solid-state switching for high-
speed multiplexing, ratio, or delta applications.
The optional Model 2001-TCSCAN Thermocouple/General
Purpose Scanner Card allows you to multiplex one of nine 2-
pole, or one of four 4-pole analog signals into the Model
2002, and/or any combination of 2- or 4-pole analog signals.
Refer to the instruction manual for the Model 2001-TCS-
CAN for complete operation information.
When using these cards, the Model 2002 can:
• Close and open individual channels.
• Scan through channels using a separate measurement
function for each channel, if desired.
• Perform ratio and delta measurements using two user-
defined channels.
Using external scanner cards
When using external scanning, you can define separate mea-
surement functions for a maximum of 80 channels. Note
however, that you cannot close or open external channels
using Model 2002 controls. Use the switching mainframe
controls to open and close individual channels.
In order to synchronize Model 2002 measurements with
external channel closure, connect the Model 2002 external
trigger inputs or the trigger link to the external switching
mainframe trigger inputs and outputs. Refer to paragraphs
2.7.6 and 2.7.7 for examples on using external triggering and
the trigger link.

2.11.2 Front panel scanner controls

Controls that affect scanner card operation include:
• CHAN: Allows you to open and close internal scanner
card channels.
• CONFIGURE CHAN: Defines the measurement func-
tions for each internal and external scanner card chan-
nel, selects the number of external channels, defines
channels assigned to the internal scan list, and saves/
restores an alternate measurement function.
• CONFIGURE SCAN: Selects internal or external scan-
ning and controls ratio/delta operation when using the
internal scanner.
• SCAN: Starts/stops scanning using the selected scan
list. Configures scan count, scan interval, and enables
buffer storage and recall if internal or external list is
selected.
• EXIT: Disables scanning and returns to normal
operation. (Trigger model is restored to pre-scanning
configuration.)
• and : Allows you to manually scan through chan-
nels.
• PREV/NEXT DISPLAY: Allows you to display the two
adjacent channels (manual scanning only).
Front Panel Operation
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