Fluke 45 user manual Using Measurement Functions in Combination

45

Users Manual

				45 DUAL DISPLAY MULTIMETER
	V		10A		M		AUTO
	600V CAT I	!					VAC			Hz	CAL
	1000V CAT I
											ENABLE
	COM		100
			mA
		FUSE F1	V	A					REL	dB	2ND
		500 mA
		F 250V							REF#	REF	LOCAL
	FUSED		V	A	FREQ	AUTO
									HOLD	MN MX	RATE
						COMP	HI	LO	THRESH	ADDR	BAUD
+	-								POWER
	V								2ND
			FREQ
											aam16f.eps

Figure 4-1. Dual Display Showing Volts AC and Frequency

Using Measurement Functions in Combination

The dual display allows you to display two properties of the input signal being measured. Any combination of two properties from the list below is allowed, even those that may not be useful:

Volts dc

Volts ac

Current dc

Current ac

Resistance

Frequency

Diode Test/Continuity

Note

Volts (dc + ac) rms or Current (dc + ac) rms measurements can only be made in the primary display. While (dc + ac) measurements are being made, another function cannot be selected for the secondary display.

Additional combinations of dual readings are added if you use the function modifiers— i.e., REL, MN MX, HOLD, or dB.

Some applications of the dual display using common combinations of readings are provided in Table 4-1.

Taking Voltage and Current Measurements Using the Dual Display

Most applications of the dual display listed in Table 4-1 can be performed using a single set of test leads connected to the Xand COM input terminals.

However, to measure the voltage and current of an input signal requires three leads. Be sure that the voltage and current measurements share the same common as shown in Figure 4-2. Then simply follow the precautions you would follow if you were making normal current measurements without a current clamp.

4-2