HT INSTRUMENTS HT4010 AC Clamp Meter User Guide

: June 4, 2024
: HT INSTRUMENTS

User manual

Release EN 1.01 – 03/02/2012

HT4010

1 SAFETY PRECAUTIONS AND PROCEDURES

This clamp complies with IEC/EN61010-1. For your own safety and in order to avoid damaging the instrument, you’re recommended to keep to the instructions contained in this manual and read carefully all the notes preceded by the symbol .

Take extreme care for the following conditions while measuring:

Do not measure voltage or current in humid or wet environment
Do not use the meter in presence of explosive gas (material), combustible gas (material), steam or dust
Insulate yourself from the object to be tested
Do not touch exposed metal (conductive) parts such as test lead ends, sockets, fixing objects, circuits, etc
If you detect anomalies of testing end (metal part) and attachment of the meter such as breakages, deformations, foreign substances, no display, etc., do not take any measurement
Measuring voltage over 20V as it might cause human body electricity conduction

The followings symbols are used:

Caution: refer to the instruction manual. An incorrect use may damage the tester or its components
High Voltage ranger: electrical shock risk
HT4010 - Symbol 3 Double insulated instrument
AC Voltage or Current
DC Voltage

1.1 PRELIMINARY

This apparatus has been designed for use in an environment of pollution degree 2. Indoor use
It measures CURRENT and VOLTAGE on category III up to 600V (refer to ground) plants. For overvoltage categories please see paragraph 1.4
You must comply with the usual safety regulations aimed at:
♦ Protecting you against the dangerous electric current
♦ Protecting the instrument against an incorrect operation
Only the leads supplied with the instrument guarantee compliance with the safety standard. They must be in good conditions and they must be replaced, if necessary, with an identical model
Do not test or connect to any circuit whose voltage or current exceeds the specified overload protection
Do not perform any test at environmental conditions exceeding the limits indicated
Make sure that the battery are installed correctly
Before connecting the test probes to the installation, check that the function selector is positioned on the required measurement
Make sure that the LCD and the rotate switch show the same as the function desired

1.2 BEFORE USE

Always keep to the instructions contained in this manual:

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CAUTION

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Non compliance with the warnings and/or the instructions may damage the tester and/or its components or injure the operator.

Before changing the switch’s position, take off the clamp jaw from the tested conductor or the electrical circuit in order to avoid any accident
When the clamp is connected to the circuits to be tested, never touch unused terminals
When testing resistors, do not add voltage. Although there is a protection circuit, excessive voltage would cause malfunctioning
Before measuring current, remove the voltage-resistance test leads
When measuring current, any strong current near or close to the clamp jaw will affect the accuracy
When measuring current, always put the tested conductor in the middle of the clamp jaw in order to obtain a more accurate reading
If the reading value or the sign indication remains unchanged during the measurement, check if the HOLD function is active

1.3 AFTER USE

Once the measurements are completed, turn the rotary switch to OFF
If you expect not to use the clamp for a long time, remove the battery

1.4 MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS

The norm IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use, Part 1: General requirements, defines what measuring category, usually called overvoltage category, is. On paragraph 6.7.4: Measuring circuits, it says:

(OMISSIS)

circuits are divided into the following measurement categories:

Measurement category IV is for measurements performed at the source of the low-voltage installation
Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units
Measurement category III is for measurements performed in the building installation
Examples are measurements on distribution boards, circuit breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial use and some other equipment, for example, stationary motors with permanent connection to fixed installation
Measurement category II is for measurements performed on circuits directly connected to the low voltage installation
Examples are measurements on household appliances, portable tools and similar equipment
Measurement category I is for measurements performed on circuits not directly connected to MAINS
Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS-derived circuits. In the latter case, transient stresses are variable; for that reason, the norm requires that the transient withstand capability of the equipment is made known to the user

2 GENERAL DESCRIPTION

HT4010 meter can performs the herewith measurements:

DC and AC voltage
Detection of AC voltage without contact
AC current
Resistance and test continuity
Diode test

Each parameter can be selected by rotating the 8-positions switch included OFF position. To abilitate the hold function the HOLD key is available. There are also key to activate/desactivate the display backlight, the RANGE key for manual selection of measurement ranges, the MAX key for maximum value measurement of some parameters and the MODE key for the selection of different features common at the same position of selector rotation. The selected quantity appears on a high-contrast liquid crystal display with indication of measurement units and functions. The instrument disposes of an Auto Power Off function consisting in an automatic switching off 15 minutes after last selector rotation.

2.1 TRMS AND MEAN VALUE MEASURING INSTRUMENTS

Safety testers for alternate quantities are divided into two big families:

MEAN VALUE instruments: instruments which measure only the value of the wave at the fundamental frequency (50 or 60 Hz)
TRUE ROOT MEAN SQUARE instruments, also defined as TRMS: instruments which measure the true root mean square value of the quantity under test

In presence of a perfectly sinusoidal wave, both families provide identical results. In presence of distorted waves, instead, the readings are different. Mean value instruments provide only the value of the fundamental wave while True RMS instruments provide the value of the entire wave, including harmonics (within the passband of the instrument). Accordingly, if the same quantity is measured with both kinds of instruments, the measured values are identical only if the wave is purely sinusoidal. Should it be distorted, True RMS instruments provide higher values than medium value instruments.

2.2 TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR DEFINITIONS

The current effective value is defined as follows: “In an interval of time equivalent to a period, an alternate current with effective value having an intensity of 1A, by passing on a resistor, disperses the same energy which would be dispersed in the same period of time by a direct current having an intensity of 1A”. From this definition comes the numerical expression: G= The effective value is indicated as RMS (root mean square).
The Crest Factor is defined as the ratio between the Peak Value of a signal and its effective value: CF (G)= Gp / GRMS. This value varies according to the waveform of the signal, for a purely sinusoidal wave it’s worth √2 =1.41. In presence of distortions the Crest Factor assumes higher values as long as the wave distortion is higher.

3 PREPARATION FOR USE

3.1 INITIAL

The tester has been checked from a mechanical and electrical point of view before shipment.

Every care has been taken to make sure that the instrument reaches you in perfect conditions.

However, it’s advisable to make a rapid check in order to detect eventual damages which may have occurred in transit. Should this be the case, enter immediately the usual claims with the carrier.

Make sure that all the accessories listed in paragraph 6.3.1 are contained in the package. In case of discrepancies contact the dealer.

In case of returning of the tester please keep to the instructions given in paragraph 7.

3.2 POWER SUPPLY

The instrument is battery supplied. One battery 9V IEC 1604 NEDA 6F22 are included in the package. When battery is low, the symbol “BAT” appears on the display. Replace it immediately, following the instructions given in paragraph 5.2.

3.3 CALIBRATION

The tester complies with the technical features listed in this manual. Its performances are guaranteed for one year.

3.4 STORAGE

In order to guarantee the accuracy of the measurements, after a period of storage in extreme environmental condition, wait for the necessary time so that the tester returns to normal measuring conditions (see environmental specifications, paragraph 6.2.1).

4 OPERATING INSTRUCTIONS

4.1 INSTRUMENT DESCRIPTION

4.1.1 Commands description

HT4010 - Fig. 1

LEGEND:

Clamp jaw
Red LED for AC voltage detection without contact
Clamp trigger
Rotary function selector
HOLD key
backlight key
LCD display
MODE key
RANGE key
MAX key
COM input jack
VΩ input jack
Battery cover

Fig. 1: Instrument description

4.2 FUNCTION KEY DESCRIPTION

4.2.1 HOLD key
By pushing HOLD key the parameter’s measured value is frozen on the display and the symbol “HOLD” appears on it. Pushing HOLD key another time deactivates this mode.

4.2.2 key
By pushing and hold key for about 1s it’s possible to activate the backlight function on the display. By pressing and hold key again for about 3s to exit from the function or waiting the automatically disable after about 20 seconds. The function is available on each position of the rotary selector.

4.2.3 RANGE key
By pushing RANGE key, the manual mode is activated and the “AUTO” symbol disappears from the display. Press RANGE cyclically to change the measuring range and fix the decimal point on the display. For reading more than the maximum range the “ OL ” indication is shown at display. To exit this function keep RANGE key pressed for at least 1 second or rotate the selector to another position. This feature is disabled for AC current diode test and continuity test measurements.

4.2.4 MAX key
By pushing MAX key, maximum value are measured. The symbol corresponding “MAX” is displayed. This value is stored and automatically updated as soon as an higher value is measured by meter. Press MAX key again or rotate the selector to another position to exit from this function. This feature is disabled for resistance, diode test and continuity test measurements.

4.2.5 MODE key
By pushing MODE key the selection of a double measured functions which are present at display is possible. In particular this key is active only in Ω / position to select among resistance test, diode test and continuity test.

4.3 FUNCTIONS OF ROTARY SWITCH DESCRIPTION

4.3.1 DC Voltage measurement

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CAUTION

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Maximum input for AC Voltage measurements is 600VDC or 600VACrms. Do not take any voltage measurement exceeding this limit in order not to risk electrical shock or damaging the meter.

HT4010 - Fig. 2

Fig. 2: Taking DC voltage measurement

Rotate the switch on V position. The “DC” symbol is shown at display
Pressing the RANGE key to select the correct range or using the Autorange feature (see paragraph 4.2.3). If the voltage value under test is unknown, select the highest range
Insert the red test lead plug into VΩ jack and the black test lead plug into COM jack
Connect the two long ends of test leads to the desired circuit (see Fig. 2) then reading will be displayed
“ OL ” message is shown at display if the DC voltage under test is over the maximum value that the instrument is able to measure
The “-” symbol at display means that the voltage have an opposite sign respect the connection of Fig. 2)
For HOLD and MAX features please refer to paragraph 4.2

4.3.2 AC Voltage measurement

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CAUTION

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Maximum input for AC Voltage measurements is 600VDC or 600VACrms. Do not take any voltage measurement exceeding this limit in order not to risk electrical shock or damaging the meter.

HT4010 - Fig. 3

Fig. 3: Taking AC voltage measurement

Approach the meter closest to AC source and note the turn on of red LED which is placed to the bottom of clamp jaws (see Fig. 1) which detect the AC voltage
Rotate the switch on V position. The “AC” symbol is shown at display
Pressing the RANGE key to select the correct range or using the Autorange feature (see paragraph 4.2.3). If the voltage value under test is unknown, select the highest range
Insert the red test lead plug into VΩ jack and the black test lead plug into COM jack (see Fig. 3)
Connect the two long ends of test leads to the desired circuit (see Fig. 3) then reading will be displayed
“ OL ” message is shown at display if the AC voltage under test is over the maximum value that the instrument is able to measure
For HOLD and MAX functions please refer to paragraph 4.2

4.3.3 AC Current measurement

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CAUTION

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Make sure that all the test leads are disconnected from the meter terminals for current measurement.

HT4010 - Fig. 4

Fig. 4: Taking AC current measurement

Rotate the switch on position on a measurement range between 2A and 600A . If the current value under test is unknown, select the highest range
Put the conductor to be tested inside to the clamp jaw (see Fig. 4), then the current value is shown at display
“ OL ” message is shown at display the current under test is over the maximum value that the instrument is able to measure
For HOLD and MAX functions please refer to paragraph 4.2

4.3.4 Resistance measurement

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CAUTION

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Before taking any in circuit resistance measurement, remove power from the circuit to be tested and discharge all the capacitors.

HT4010 - Fig. 5

Fig. 5: Taking resistance measurement

Rotate the switch on Ω position. The “Ω” symbol is shown at display
Pressing the RANGE key to select the correct range or using the Autorange feature (see paragraph 4.2.3). If the resistance value under test is unknown, select the highest range
Insert the red test lead plug into VΩ jack and the black test lead plug into COM jack
Connect the two long ends of test leads to the desired circuit (see Fig. 5) then reading value of resistance will be displayed
When “ OL ” symbol is displayed, the resistance under test is over the maximum value that the instrument is able to measure
For HOLD function please refer to paragraph 4.2

4.3.5 Continuity test and Diode test

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CAUTION

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Before taking any in circuit resistance measurement or diode test, remove power from the circuit to be tested and discharge all the capacitors.

HT4010 - Fig. 6

Fig. 6: Taking continuity test and diode test

Rotate the switch on Ω position
Pushing MODE key and select continuity test. The symbol is shown at display
Insert the red test lead plug into VΩ jack and the black test lead plug into COM jack and perform continuity test on the object on test (see Fig. 6 – left side). Buzzer emits sound if the measured resistance value is less about 150Ω
Pushing MODE key and select diode test. The “ ****” symbol is shown at display
Connect the red test leads to the anode of diode on test and the black test lead on the cathode ones (see Fig. 6 – right side). The correspondent threshold voltage of P-N junction is showed on display
Reverse position of test leads to reading inverse polarization voltage

5 MAINTENANCE

5.1 GENERAL INFORMATIONS

This digital clamp meter is a precision instrument. Whether in use or in storage, please do not exceed the specification requirements to avoid possible damages or dangers
Do not place this meter at high temperatures or humidity or expose it to direct sunlight
Be sure to turn off the meter after use. If you expect not to use the tester for a long time, remove the battery in order to avoid leakages of battery liquid that would damage the internal parts

5.2 BATTERY REPLACEMENT

When “BAT” symbol appears on the display, replace the battery

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CAUTION

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Only expert and trained technicians must perform this operation. Remove the test leads or the conductor under test before replacing the battery.

Rotate the switch on OFF
Remove the test leads or the objects to be tested
Remove the screw from the battery cover, and detach the battery cover from the bottom cover
Remove the battery
Replace the battery with a same type new one
Replace the battery cover and screw
Use the appropriate battery disposal methods for Yr area

5.3 CLEANING

For cleaning the instrument use a soft dry cloth. Never use a wet cloth, solvents or water, etc.

5.4 END OF LIFE

CAUTION: this symbol indicates that equipment, battery and its accessories shall be subject to a separate collection and correct disposal.

6 TECHNICAL SPECIFICATIONS

6.1 CHARACTERISTICS

Accuracy is indicated as [% rdg + dgt]. It is referred to: 23°C ± 5°C with RH <80%RH

DC Voltage

Range

| Resolution| Accuracy| Input impedance| Overload protection
---|---|---|---|---
200.0mV| 0.1mV| ±(0.8%rdg + 2dgt)| 10MΩ|

600VDC/ACrms

2.000V

| 0.001V|

±(1.5%rdg + 2dgt)

20.00V

|

0.01V

200.0V

|

0.1V

600V

| 1V|

±(2.0%rdg + 2dgt)

AC Voltage

Range

| Resolution| Accuracy
(50 ÷ 60Hz)| Input impedance| Overload protection
---|---|---|---|---
200.0mV| 0.1mV| ±(1.5%rdg + 3.5mV)| 10MΩ|

600VDC/ACrms

2.000V

| 0.001V|

±(1.8%rdg + 8dgt)

20.00V

| 0.01V
200.0V|

0.1V

600V

| 1V|

±(2.5%rdg + 8dgt)

AC Current

Range

| Resolution| Accuracy| Frequency range| Overload protection
---|---|---|---|---
2.000V| 0.001V| ±(2.5%rdg + 10dgt)| 50÷60Hz|

600Arms

20.00V

| 0.01V| ±(2.5%rdg + 4dgt)
200.0V|

0.1V

600V

| 1V|

±(4.0%rdg + 8dgt)

Resistance and Continuity test

Range

| Resolution| Accuracy| Buzzer| Overload protection
---|---|---|---|---
200.0Ω| 0.1Ω| ±(1.0%rdg + 4dgt)| ≤150Ω|

600VDC/ACrms

2.000kΩ

| 0.001kΩ| ±(1.5%rdg + 2dgt)
20.00kΩ|

0.01kΩ

200.0kΩ

| 0.1kΩ
2.000MΩ| 0.001MΩ|

±(2.5%rdg + 3dgt)

20.00MΩ

| 0.01MΩ|

±(3.5%rdg + 5dgt)

Diode test

Features

| Test current| Open voltage
---|---|---
| 0.3mA typical|

1.5VDC

6.1.1 Safety
Comply with: IEC/ENEN 61010-1
Insulation: Double insulation
Pollution: Level 2
For inside use, max height: 2000m (6562 ft)
Installation category: CAT III 600V to ground

6.1.2 General data
Mechanical characteristics
Size: 197(L) x 70(W) x 40(H)mm ; 8 (L) x 3(W) x 2(H) inches
Weight (including battery): about 183g (6 ounces)
Max conductor size: 30mm

Supply
Battery type: 1x9V alkaline battery NEDA 1604 IEC 6F22
Low battery indication: “BAT” is displayed when the battery level is too low
AutoPowerOFF after about 15min

Display
Characteristics: 3½ LCD with maximum reading 2000 points plus decimal point, unit symbol indication and backlight
Sample rate: 2 times/sec
Conversion mode: Mean value

6.2 ENVIRONMENTAL CONDITIONS

6.2.1 Climatic conditions
Reference temperature: 23° ± 5°C (73°F ± 41°F)
Operating temperature: 5 ÷ 40°C (41°F ÷ 104°F)
Operating humidity: <80%RH
Storage temperature: -20 ÷ 60 °C (-4°F ÷ 140°F)
Storage humidity: <80%RH

This product conforms to the prescriptions of the European directive on low voltage 2006/95/EEC and to EMC directive 2004/108/EEC

6.3 ACCESSORIES

6.3.1 Standard accessories
The content of a standard package is the following:

Instrument HT4010
Test leads – Cod. KIT4000A
Carrying bag
Battery
User manual

7 SERVICE

7.1 WARRANTY CONDITIONS

This instrument is guaranteed against material or production defects, in accordance with our general sales conditions. During the warranty period the manufacturer reserves the right to decide either to repair or replace the product.
Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it. Do not forget to enclose a report describing the reasons for returning (detected fault). Use only original packaging. Any damage occurred in transit due to non original packaging will be charged anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.

The warranty doesn’t apply to:

Accessories and batteries (not covered by warranty).
Repairs made necessary by improper use (including adaptation to particular applications not foreseen in the instructions manual) or improper combination with incompatible accessories or equipment.
Repairs made necessary by improper shipping material causing damages in transit.
Repairs made necessary by previous attempts for repair carried out by non skilled or unauthorized personnel.
Instruments for whatever reason modified by the customer himself without explicit authorization of our Technical Dept.

The contents of this manual cannot be reproduced in any form without our authorization.

Our products are patented. Our logotypes are registered. We reserve the right to modify characteristics and prices further to technological developments.

7.2 SERVICE

Shouldn’t the instrument work properly, before contacting your distributor make sure that battery is correctly installed and working, check the test leads and replace them if necessary. Make sure that your operating procedure corresponds to the one described in this manual.
Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it. Do not forget to enclose a report describing the reasons for returning (detected fault). Use only original packaging. Any damage occurred in transit due to non original packaging will be charged anyhow to the customer.
The manufacturer will not be responsible for any damage to persons or things.