Elenco Compact Digital Multimeter Manual de usuario descargar pdf (Pagina 16)

DIODE CHECK

RANGE RESOLUTION MAX TEST CURRENT MAX OPEN CIRCUIT VOLTAGE

DIODE 1mV 1.4mA 2.8V

TRANSISTOR h

TEST

RANGE TEST RANGE TEST CURRENT TEST VOLTAGE

NPN/PNP 0 - 1000 Ib = 10μA Vce 3V

CONTINUITY TEST

Audible Indication: Less than 20Ω approx.

-15-

SPECIFICATIONS

GENERAL

DISPLAY 3 1/2 digit LCD, with polarity

OVERRANGE INDICATION 3 least significant digits blanked.

MAXIMUM VOLTAGE BETWEEN

TERMINALS AND EARTH GROUND CAT II 600V

STORAGE ENVIRONMENT –10

C to 50

TEMPERATURE COEFFICIENT (0

C to 18

C and 28

C to 50

less than 0.1 x applicable accuracy

specification per

POWER 9V alkaline or carbon zinc battery.

FUSE 200mA/250V

DIMENSIONS 126 x 70 x 24mm.

DC VOLTAGE

RANGE RESOLUTION ACCURACY

200mV 0.1mV +

0.5% rdg + 2d

2000mV 1mV +

0.5% rdg + 2d

20V 10mV +

0.5% rdg + 2d

200V 100mV +0.5% rdg + 2d

600V 1V +

0.5% rdg + 2d

MAXIMUM ALLOWABLE INPUT 250V rms for 200mV, 600VDC

or rms AC for other ranges.

INPUT IMPEDANCE 1MΩ.

DC CURRENT

RANGE RESOLUTION ACCURACY

200μA0.1μA+

1.8% rdg + 2d

2000μA1μA+

1.8% rdg + 2d

20mA 10μA+

1.8% rdg + 2d

200mA 100μA+

2.5% rdg + 2d

10A 10mA +

3% rdg + 3d

OVERLOAD PROTECTION 200mA/250V fuse (μA,mA input only).

10A not fused (15 seconds only)

AC VOLTAGE

RANGE RESOLUTION ACCURACY

200V 100mV +

2% rdg + 10d

600V 1V +

2% rdg + 10d

MAXIMUM ALLOWABLE INPUT 600VDC or rms AC.

FREQUENCY 45 - 450Hz.

RESISTANCE

RANGE RESOLUTION ACCURACY

200Ω 0.1Ω +1% rdg + 10d

2000Ω 1Ω +

1% rdg + 10d

20kΩ 10Ω +1% rdg + 10d

200kΩ 100Ω +

1% rdg + 10d

2000kΩ 1kΩ +

1% rdg + 4d

MAXIMUM OPEN CIRCUIT VOLTAGE 3.2V.

MAXIMUM ALLOWABLE INPUT 250V rms AC

MEASUREMENT

Figure 9 shows a simplified diagram of the h

measurement function. Internal circuits in the

7106 IC maintain the COMMON line at 2.8 volts

below V+. When a PNP transistor is plugged into

the transistor socket, base to emitter current

flows through resistor R1. The voltage drop in

resistor R1 due to the collector current is fed to

the 7106 and indicates the h

of the transistor.

For an NPN transistor, the emitter current

through R2 indicates the h

of the transistor.

Figure 9

Common

PNP

NPN

7106

100mV

Ref.

Low Pass

Filter

V+

CONTINUITY MEASUREMENT

Figure 8 shows a diagram of the continuity

measurement function. The circuit uses two op-

amps and a piezoelectric buzzer. When the

leads are connected across a circuit and the

resistance less than 20Ω the circuit oscillates

and the buzzer sounds.

Figure 8

1 2 ... 11 12 13 14 15 16 17 18 19 20

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Elenco Compact Digital Multimeter Manual de usuario Pagina 16

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