Fluke 45 - Manual (Page 43)

45
Users Manual
3-16
Using The Compare (Comp) Function
The compare function (COMP) provides an easy way to determine if a reading falls
within a designated range of values. In the compare mode, the meter displays a reading in
the primary display and indicates in the secondary display if that value is lower (LO)
than, higher (HI) than, or within a range (PASS) you selected.
The compare function can be used with any other function modifier — i.e., REL, MN
MX, HOLD, or dB.
Before selecting the compare function, set the high and low points of the tolerance range
that a reading will be compared against. This can be done in three ways:
•
Set the high and low compare points to the present reading by pressing and holding
down
S , and then pressing either U (HI) or T (LO).
The value presently displayed becomes either the high or low point. If the display is
blank, the meter emits a beep and previously set high or low point remains
unchanged.
OR
•
Use the number editor, as described under "Using the Number Editor" later in
Chapter 3. (Before entering the number editor, be sure you are in the appropriate
range.)
The decimal point and input range are fixed according to the range in the editor.
OR
•
Use the computer interface commands COMPHI and COMPLO to set the high and
low compare points remotely. (Refer to Chapter 5 and Table 5-13.)
To select the compare function, press
S , then press E (COMP). When COMP is
first selected, Touch Hold is also activated (and annunciated). Before a stable value is
detected, two dashes are shown in the secondary display. When a stable value is detected,
the meter emits a beep, the reading is displayed in the primary display, and "HI", "LO",
or "PASS" is shown in the secondary display. If the value is either HI or LO, the meter
emits a second beep. (If the reading is near zero, only two dashes are shown in the
secondary display.)
Touch Hold can be turned off by pressing and holding down
H for longer than one
second. The secondary display then updates each time a new reading is taken, but a beep
is not sounded.
The List and Number Editors
Two editors can be invoked from the front panel:
•
The "list editor" allows you to scroll through and select from a list of options.
•
The "number editor" allows you to edit or enter a numeric value.
"Editing" is performed in the primary display. The normal operation of the meter is
interrupted when either editor is invoked.
If a computer interface command is received by the meter during editing, the edit is
aborted, and the meter returns to normal operation. The item being edited is not changed.