User manual

Front Panel Operation
3-94 2001-900-01 Rev. K/ August 2010
PERCENT
This selection lets you specify the target value for the
percentage calculation. The default message indicating the
presently set target value is displayed as follows:
100%= +1.000000e+00
1. To retain the displayed target value, press ENTER or
EXIT.
2. To set a different target, use the cursor keys ( and
) to select the digits, and the RANGE  and 
keys to increment and decrement the digits. Press EN-
TER when done.
PERCENT DEVIATION
This menu item selects the percent deviation calculation and
returns the display to the normal measurement state.
3.10.5 Enabling math
The MATH key toggles the selected math operation on and
off from the normal reading display. Once a math operation
is enabled, it is in effect across function changing. This is
indicated by the MATH annunciator and, at the right side of
the top line, the type of math enabled (NONE, mX+b, or %).
Pressing the MATH key to enable a math operation
momentarily displays one of the following typical messages:
Math Enabled
Display = NONE (Reading)
or
Math Enabled
Display = mX+b (Reading)
or
Math Enabled
Display = % (Reading)
Then the Model 2001 displays the result of the calculation on
the top line, using scientific notation where necessary.
3.10.6 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.
3.11 Scanning
The Model 2001 can be used with an internal scanner card
(Model 2001-SCAN) or with external scanner cards installed
in switching mainframes such as the Models 706 and 7001.
The following paragraphs discuss various aspects of using
scanning with the Model 2001.
3.11.1 Scanning overview
A scanner allows you to switch among a number of input
signals to the Model 2001 for measurement. The channel
control and scanning capabilities depend on whether an
internal or external scanner card is being used, as well as on
the capabilities of the scanner card in question. Refer to the
documentation 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
channels. Two of the channels use solid-state switching for
high-speed multiplexing, ratio, or delta applications.
When using this card, the Model 2001 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
measurement functions for a maximum of 80 channels. Note