Fervi T051 User manual
USE AND
MAINTENANCE MANUAL
Pocket digital multimeter
Art. T051
ORIGINAL INSTRUCTIONS
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FOREWORD
Read this manual before any operation
ORIGINAL INSTRUCTIONS
Before starting any operation it is compulsory to read this instruction manual. The guarantee
of smooth operation and full performance of the instrument is highly dependent on the
application of all the instructions contained in this manual.
Operator Qualification
The workers responsible for using this device must have all the necessary information,
education and receive adequate training regarding safety, including:
a) The conditions of use of the equipment;
b) Foreseeable abnormal situations, pursuant to Article 73 of Legislative Decree
81/08.
We guarantee the instrument complies with the specifications and technical
instructions described in the Manual on the date of its issuance (shown in this page).
On the other hand, the instrument may also be subject to important technical changes
in the future, without the manual being updated.
Therefore, see FERVI for information about modifications that could be implemented.
REV. 3 March 2014
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CONTENTS
1 INTRODUCTION ........................................................................................ 4
2 SPECIFICATIONS ...................................................................................... 5
2.1 General Characteristics .................................................................................................5
2.2 Technical Specifications ................................................................................................5
2.2.1 Voltage DCV.............................................................................................................. 5
2.2.2 Voltage ACV .............................................................................................................. 6
2.2.3 Direct current DCA ..................................................................................................... 6
2.2.4 Resistance ................................................................................................................ 6
2.2.5 Audible continuity test and diode ................................................................................. 6
3 USING THE MULTIMETER .......................................................................... 7
3.1 Preliminary notes..........................................................................................................7
3.2 Measurement of DC voltage DCV ...................................................................................7
3.3 Measuring direct current DCA .......................................................................................7
3.4 Measuring AC voltage ACV ............................................................................................7
3.5 Measuring resistors.......................................................................................................8
3.6 Measuring diodes and continuity tests ..........................................................................8
4 REPLACING THE BATTERY AND THE FUSE ................................................. 9
4.1 Battery replacement .....................................................................................................9
5 IDENTIFICATION PLATE ......................................................................... 10
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1 INTRODUCTION
This compact shaped professional digital tester is designed for measurements of:
AC voltage VAC,
DC voltage VDC,
direct current DC,
resistance,
diodes,
continuity.
Measuring voltage
Always make sure that the switch is in the appropriate position.
To avoid electric shock, use this instrument with caution.
Disconnect the circuit before starting the measurement.
Make sure that the AC voltage or DC voltage are not connected while measuring the
resistance (ohms).
Before using the instrument, make sure it is properly closed.
Do not exceed the maximum measurement value.
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2 SPECIFICATIONS
2.1 General Characteristics
Measuring method: dual integration.
Display: 3 Digits and ½ LCD.
Polarity: Automatic negative polarity indication.
Number of measurements: 2-3 times/sec.
Low battery indication: the battery symbol appears on the left side of the display.
Dimensions: 120x70x20mm.
Weight: 90 g including the batteries
Batteries: 12 V (GP23A) or equivalent.
2.2 Technical Specifications
Atmospheric conditions: 0-40°C
Relative humidity: MAX 80%
2.2.1 Voltage DCV
Range Resolution Precision 18°
2V 1 mV 0.8% of the reading 1D
20V 10 mV 0.8% of the reading 1D
200V 100 mV 0.8% of the reading 1D
500V 1 V 1.0% of the reading 1D
Input impedance: 1MΩ
Maximum permitted voltage 500 VDC or AC peak, 15 seconds max. overload.
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2.2.2 Voltage ACV
Range Resolution Precision 18° 26° C
200 V 100mV 2.0% of the reading 10D
500 V 1 V 2.0% of the reading 10D
Frequency range: 50 to 200 KHz.
Maximum permitted voltage 500Vrms AC.
RMS indication of sinusoidal current.
2.2.3 Direct current DCA
Range Resolution Accuracy
200 mA 100uA 2.0% of the reading 2D
Overload protection: 0.5A/250V fuse.
2.2.4 Resistance
Range Resolution Accuracy
2 K1 1.0% of the reading 4D
20 K10 1.0% of the reading 4D
200 K100 1.0% of the reading 4D
2000 K1 K 1.0% of the reading 4D
Maximum open-circuit voltage: 2.8 V
Overload protection: 250 Vrms AC for less than 10 seconds.
2.2.5 Audible continuity test and diode
Test Test conditions
1mA 2.8V
Alarm sounds when the resistance is
less than 30Ω 1Ω
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3 USING THE MULTIMETER
3.1 Preliminary notes
Check that the probes are in good condition. If they are damaged, replace them.
The function selector switch must be positioned on the appropriate scale before use.
Do not perform measurements of voltage or current that exceed the maximum capacity
of the instrument.
Properly insert the battery in its compartment.
Always select a capacity which is greater than the value of current or voltage to be
measured.
Make sure the probes are properly connected to the circuit.
Remove the battery from the instrument when not in use for a long time.
Remember to turn off the instrument after use.
Do not attempt to measure the resistors inserted into live circuits or before discharging
any internal capacity of the circuit.
Select the switch depending on AC or DC.
3.2 Measurement of DC voltage DCV
1. Move the function switch to the "V" position.
2. Point the selector to the desired position If the voltage is not know, point the selector
to the highest range and reduce it to reach the appropriate range.
3. Connect the probes. The polarity of the red probe will be shown at the same time as
the voltage.
3.3 Measuring direct current DCA
1. Move the function switch to the "V" position.
2. Point the selector to the position 200mA.
3. Connect the probes. Read the value on the display.
3.4 Measuring AC voltage ACV
1. Move the function switch to the V position.
2. Point the selector to the position 200V or 500V. The reading of the measurement can
be obtained in other positions, but the decimal point is not in the exact position.
3. Open the circuit to be measured and connect the probes to the two extremes.
4. Read the value obtained on the display together with the correct polarity.
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3.5 Measuring resistors
1. Move the function switch to position .
2. Point the selector to the desired position.
3. If the resistance to be measured is connected to a circuit, turn off the power and
deactivate it before applying the probes.
4. Connect the probes to the resistor, read the value on the display.
3.6 Measuring diodes and continuity tests
1. Move the function switch to the position
2. Move the selector to the position with the diode symbol.
3. Connect the red probe to the diode anode and the black probe to the cathode, read the
measurement on the display in mV.
4. Connect the probes to two points of the circuit, a beep indicates if the resistance is
lower than 30 .
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4 REPLACING THE BATTERY AND THE FUSE
Opening the instrument
Make sure that the instrument is disconnected and switched off before replacing the batteries.
4.1 Battery replacement
1. When the batteries are almost used, the battery symbol appears on the display
2. Turn off the appliance and disconnect the probes from the circuit before replacing the
battery.
3. Remove the cover on the back of the unit and replace the batteries making sure that
the correct polarity is respected.
4. Caution: Do not use the instrument with the cover open.
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5 IDENTIFICATION PLATE
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