Front Panel Operation
3-6
MATH:
When a math operation (percent, mX+b, or none)
has been selected from the CONFIGURE MATH menu, this
indicator turns on when the MATH key is pressed.
4W:
Turns on to indicate the 4-wire resistance function, in-
circuit current, or temperature with a 4-wire RTD.
AUTO:
Turns on when autoranging is selected for voltage,
current (except in-circuit current, which has a fixed 12A
range), or resistance measurements.
ARM:
Turns on when the Model 2001 is taken out of the idle
state (by the TRIG key or the :INIT or :INIT:CONT ON bus
command). A measurement can only be performed with the
Model 2001 out of the idle state.
*:
Indicates when normal readings are being stored.
3.3.2 Multiple displays
Each measurement function has its own set of “multiple dis-
plays” shown on the bottom line of the front panel display.
The PREVious and NEXT DISPLAY keys scroll through the
selections for the present function.
Some of the multiple displays are for multiple functions,
where different functions are measured sequentially from the
same set of test leads. The readings are shown simultaneous-
ly, such as:
• Top line shows a DC voltage measurement; bottom line
shows positive and negative peak spike measurements.
• Top line shows an AC RMS voltage reading; bottom
line shows an AC frequency measurement and a crest
factor calculation.
Also, the multiple displays can show a reading in a different
form, or give additional information about the reading, for
example:
• Top line shows a reading; bottom line shows a zero-
centered bar graph with adjustable limits.
• Top line shows a frequency measurement; bottom line
shows the adjustable trigger level.
To scroll through the multiple displays available for each
measurement function, repeatedly press and release the
NEXT DISPLAY key. The same action with the PREVious
DISPLAY key does a reverse scroll through the displays. To
return to the default reading display, just press and hold ei-
ther key.
Multiple displays that are specific to a particular function or
operation are discussed later in this section, such as the peak
spikes displays in DC voltage, and the calculations display in
math. (See Table 3-3 for paragraph references.) Displays that
are common to most of the measurement functions are dis-
cussed here. Appendix H shows a complete listing of the
multiple displays by function.
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