Keithley 2001 User Manual

Front Panel Operation
3-54
Previously stored rel values are converted if temperature or
AC voltage units are changed. For example, a rel value of
100 that was stored with units of DEG-C is converted to 212
if temperature units are changed to DEG-F.
Note that a bench or GPIB reset clears any stored rel values
and disables rel for all functions.
3.6.2 Enabling rel
From the normal reading display, the REL key toggles the rel
operation on and off. The present state is indicated by the
REL annunciator. Each time rel is enabled by the REL key,
the present reading becomes the new rel value for that func-
tion. You cannot rel an overflow reading.
To make a new reading the rel value, rel must first be dis-
abled and then enabled again. Disabling rel does not clear
any stored rel value.
The present rel value for each measurement function can be
viewed from the CONFIG-REL display, as described in
paragraph 3.6.1.
When rel is enabled, the resulting reading is the algebraic
difference between the actual input value and the rel value:
With percent or mX+b math enabled, the rel’d reading is act-
ed on by the math operation:
A rel value expressed in dB or dBm is applied after the read-
ing is referenced to the selected level.
3.6.3 Multiple display of rel
One of the “multiple displays” allows you to view the read-
ing without rel applied on the bottom line of the display and
the rel’d reading on the top line. The display is available by
repeatedly pressing either the NEXT or PREVious DIS-
PLAY key to scroll through the multiple displays of the par-
ticular function. The following is a typical message for a rel
multiple display:
+000.012 mVAC RMS
Actual=+001.012 (without REL)
3.7 Triggers
The following paragraphs discuss front panel triggering,
trigger configuration, and external triggering, including ex-
ample setups.
Model 2001 triggers are set up in the CONFIGURE TRIG-
GER menu. The menu structure is shown and summarized in
Table 3-28. Some general rules to navigate menus are given
in paragraph 3.3.
3.7.1 Trigger model
The following information describes triggering of the Model
2001 from the front panel. The flowchart of Figure 3-22 sum-
marizes front panel triggering. It is called the Trigger Model
because it is patterned after the SCPI commands sent over
the IEEE-488 bus to control triggering.
rel'd reading = actual value - relative value
displayed reading = math operation (rel'd reading)

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English