Fluke 45 user manual REL Relative Readings Modifier, Function Modifier Selection Buttons

Operating the Meter From the Front Panel	3
Selecting A Function Modifier

-Press to Toggle In and Out of Relative Modifier

-Press to Toggle In and Out of Decibels Modifier

-Press to Select MN MX Modifier;

REL dB-Press to Toggle Between Minimum and Maximun Reading;

-Press and Hold Down for 2 Seconds to Exit MN MX Modifier.

HOLD MN MX

45DUAL DISPLAY MULTIMETER

-Press to Select Touch Hold Modifier; -Press to Force New Reading; -Press and Hold Down for

2 Seconds to Exit.

V 10A

600V CAT I	!
1000V CAT I
COM	100
	mA

FUSE F1	V
500 mA
F 250V

FUSEDV

					CAL
					ENABLE
A			REL	dB	2ND
			REF#	REF	LOCAL
A	FREQ AUTO		HOLD	MN MX	RATE
	COMP	HI	LO THRESH	ADDR	BAUD
			POWER

aam15f.eps

Figure 3-7. Function Modifier Selection Buttons

REL (Relative Readings) Modifier

When the relative modifier (REL) is selected, the reading on the primary display is always the difference between the relative base and an input measurement. For example, if the relative base is 15.000 V, and the present reading is 14.100 V, the display will show -0.900.

WWarning

To avoid electrical shock or damage to the meter, note that a relative reading may not indicate the presence of dangerous voltages at the input connectors or test leads.

Press Kto toggle in and out of the relative modifier. When the relative modifier is selected: the last valid reading is stored as the relative base, the primary display zeroes out, and "K" is shown on the primary display. (The secondary display is unaffected.)

To edit the relative base, use the number editor as described in "Using the Number Editor" later in Chapter 3).

Note

The relative modifier cannot be selected I the display shows "OL" or is blank. (The display would be blank, for example, because of external triggering or range changes.)

Selecting the relative modifier Kturns off autoranging and locks in the present range. Make sure you are in the correct range before selecting the relative modifier. If you press

Uor Tafter the relative modifier has been selected, you will automatically exit K.

When you are in REL, the relative base can be shown in the secondary display by pressing Sand, while holding it down, pressing K. Now, whenever the relative

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