Velleman AVM460 Manual de usuario

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MANUAL DES USUARIO

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AVM460

AVM460 GB

SAFETY

(CAT II 300V MAX to earth)

•Always ensure that the selector switch is set correctly.

•NEVER switch to the current or resistance ranges when measuring voltages.

•Be extremely careful when measuring voltages above 50V.

•Replacement fuses must be of the correct type and rating.

•Test leads, including the probes, must be in good order: clean, with no broken or

cracked insulation.

INSTRUCTIONS

This compact and sensitive multimeter can accurately measure AC and DC voltages,

DC current, resistance, and there is also a battery checker. The single button function

and range control is easy to operate. It has a mirrored scale for making accurate

readings with 3 different colours for rapid scale identification. The handy and sturdy

case with optional rubber protection makes this meter a user friendly instrument. It will

provide many years of trouble free service.

SPECIFICATIONS

•Accuracy in all ranges : ±% of full scale value

•Specifications valid for 23°C ±5°, 75% RH

Function Range Accuracy

DCV 0-2.5 / 10 / 50 / 250 / 500 ±5%

ACV 0-10 / 50 / 500 ±5%

DCA 0-500µ / 10m / 250m ±5%

Ω0-20K / 2MΩ

(Rx10 / Rx1K)

±5%

Battery Test 1.5V (110mA) : "AA" / "C" / "D" cell

9V (9mA) : "6F22" cell

±10% of division

between bad and

good

•Fuse: 200mA / 250V (∅5 x 20mm)

•Sensitivity: 2000 Ω/ VAC-DC

•Pointer movement: wide 3-colour mirrored scale / 180 µA movement

•Battery: 1 x 1.5V AA size or UM3 for Ω-measurements

•Dimensions: 120 x 60 x 30 mm

•Weight: 125 g

AVM460 GB

BEFORE USE

Open the back of the unit and place one AA size battery into the battery holder. Ensure

that the polarity corresponds to that shown.

Note: for the best readings, keep the meter flat on a non-metallic surface. Select the

range such that the pointer lies in the upper 1/3 of the meter scale.

If the pointer does not rest exactly over "0" to the left of the scale, turn the plastic screw

in the lower centre of the meter face to bring the needle to "0".

Ensure that the test leads are the right way around when measuring DC voltage and

current.

DC VOLTAGE MEASUREMENT

1. Set the selector switch to one of the DCV positions: it is better to start with a high

voltage range and then switch down.

2. Position the ends of the test probes on the circuit under test: ensure they are the

right way around.

3. Read the voltage on the black DC scales.

Be extremely careful when measuring voltages above 50V.

AC VOLTAGE MEASUREMENT

1. Set the selector switch to one of the ACV positions: it is better to start with a high

current range and then switch down.

2. Position the ends of the test probes on the circuit under test.

3. Read the voltage on the AC/DC scale. (for the 10V range, read from the red 10

VAC scale)

Be extremely careful when measuring voltages above 50V.

RESISTANCE MEASUREMENT

Before making any resistance measurements, disconnect the power from the circuit or

unit under test, and discharge all capacitors. If possible, it is best to remove batteries

and unplug any mains leads.

1. Set the selector switch to one of the Ωpositions. Short the two probes together and

adjust the 0 OHM ADJ knob to set the pointer to the "0" at the right of the

resistance scale. If it won’t go, replace the battery with a new one.

2. Connect the ends of the probe across the circuit or part under test.

3. Read the resistance from the OHMS scale (GREEN): use the appropriate multiplier

to get the correct value (Rx1, x10 or x 1000, depending on the resistance range).

AVM460 GB

DC CURRENT MEASUREMENT

1. Set the selector switch to the 250m DCA position (always start with a high range

and then switch down).

2. Insert the test probes in series with the circuit under test, ensure they are the right

way around.

3. Apply power to the circuit under test and read the current from the current scale.

Note : Do not attempt to read AC current.

DECIBEL MEASUREMENT

1. Set the selector switch to one of the ACV ranges.

2. For the 10VAC range, take the dB reading from the dB sale directly, but for other

ranges calculate the reading with the table:

dB range -10 to 22 4 to 36 24 to 56

ACV range 10V 50V 500V

Add value 0 14 34

NOTE: For absolute dB measurement, the circuit impedance must be 600Ω.

0dB = 1mW dissipated in a 600Ωload

3. For signals with a DC component, a capacitor (> 0.1µF) has to be connected

between the test probes and the circuit under test.

BATTERY CHECKER

1. Set the selector switch to one of the BATT positions.

2. Connect the probes to the battery, with the red lead to the + end and the black to the

- end.

3. Check the battery against the GOOD/BAD scale (green or red).

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