Fluke 45 user manual Using The Compare Comp Function, List and Number Editors

45

Users Manual

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 Hfor 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.

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