HT Instruments HT7003 USER MANUAL



ENG

HT7003

USER MANUAL

 Copyright HT ITALIA 2015 Release EN 1.00 - 26/01/2015

6. FUNCTION KEYS DESCRIPTION

6.1 ON/OFF key
Press ON/OFF key to switch on and off the instrument

6.2 DH key

By pressing DH key the measured value is hold on the display
where the symbol "DH" appear. Pressing again DH to disable this
function and resume normal operation

6.3 Auto Power OFF feature

In order to preserve internal battery, the instrument switches
automatically off approximately 12 minutes after it was last used.
The symbol “APO” appears on the display when this function is
active

Press twice the ON/OFF key to switch on the
instrument after an Auto Power OFF operation

7. PRELIMINARY INSTRUCTIONS

 This instrument has been designed for use in

environments with pollution degree 2

 It can be used for AC CURRENT

measurements on installations with
measurement category CAT III 300V

 Do not test or connect to any circuit exceeding

the specified overload protection

 Do not effect measurements under

environmental conditions exceeding the limits
indicated in § 12.2

 Make sure that battery is properly installed
 When the instrument is connected to

measuring circuits never touch any unused
terminal

 If during measurement the displayed values

remain constant check whether the HOLD
function is active

CAUTION

CAUTION

1. PRECAUTIONS AND SAFETY MEASUREMENTS

This instrument complies with safety Standard IEC/EN61010-1
related to electronic measuring instruments. For your own safety and
to avoid damaging the instrument follow the procedures described in
this instruction manual and read carefully all notes preceded by this

symbol

CAUTION

 Avoid measuring in humid or wet places
 Avoid measuring in rooms where explosive

gas, combustible gas, steam or excessive dust
is present

 Keep you insulated from the object under test
 Do not touch exposed metal parts such as test

lead ends, sockets, fixing objects, circuits etc.

 Avoid doing that if you notice anomalous

conditions such as breakages, deformations,
fractures, leakages of battery fluid, blind display
etc.

 Be careful when measuring on circuits with

voltages exceeding 20V to avoid risks of

The following symbols are used in user manual and on the meter:

electrical shock

CAUTION - refer to the instruction manual - an
improper use may damage the instrument or its
components

Double insulated meter

Use appropriate security measures to apply/remove
the instrument on/from live conductors

AC current
Ground reference
CAUTION: this symbol indicates that equipment, its

accessories and battery shall be subject to a
separate collection and correct disposal

8. HOW TO PERFORM THE MEASUREMENTS

8.1 AC Current measurement

CAUTION

 Put the conductor as close as possible to the

middle of the jaws in order to meet the meter
accuracy specifications

 When apply/remove the instrument on/from live

conductors, if is not possible to de-energize the
circuit on test, use appropriate security
measures (e.g. protective gloves) to avoid
dangerous electric shock for the operator and a
possible damage of the instrument

 Disconnect the main voltage or wear protective

gloves before performing measurement

 Put the hand below the safety line during the

1. Switch on the instrument by pressing ON/OFF key

2. Open the clamp jaw and insert the cable in the middle of it (see
figure – left part)

3. Do not perform measurements with more cables in cluded in the
clamp jaw (see figure – right part)

4. The AC current value will be shown on the display

5. If the message "OL" is displayed the maximum current value was
exceeded

6. For Data HOLD feature see § 6.2

7. At the end of the measurements remove the instrument from the
cable and switch off by pressing ON/OFF key

measurement as indicated in § 5

1.1 Preliminary instructions

CAUTION

This instrument has been designed for use in

environments with pollution degree 2

 It can be used for AC CURRENT

measurements on installations with
measurement category CAT III 300V

 Do not test or connect to any circuit exceeding

the specified overload protection

 Do not effect measurements under

environmental conditions exceeding the limits
indicated in § 12.2

 Make sure that battery is properly installed
 When the instrument is connected to

measuring circuits never touch any unused
terminal

 If during measurement the displayed values

remain constant check whether the HOLD

1.2 Measuring overvoltage category definitions

function is active

According to the IEC/EN61010-1 guidelines the circuits are divided
into the following measurement categories:
 CAT 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

 CAT 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

 CAT 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

 CAT 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 standard requires that the transient withstand capability of the
equipment is made known to the user

9. BATTERY REPLACEMENT

When the "BAT" low battery indication is displayed the battery must
be replaced.

CAUTION

Only expert technicians should perform this operation.
Before carrying out this operation, make sure you
have removed the cable being tested from inside the

1. Switch off the instrument by pressing ON/OFF key

2. Remove the fixing screw and the battery compartment cover in the

3. Use the tip of a screwdriver or a similar tool in the internal hole

4. Replace the battery with new one of the same type (see § 12.2) by

5. Replace battery compartment cover

6. Do not scatter old batteries into the environment. Use the relevant

10. CLEANING THE INSTRUMENT

Use a soft and dry cloth to clean the instrument. Never use wet cloths,
solvents, water, etc.

11. END OF LIFE

clamp jaw

direction of the arrow on it
(see figure) to remove the battery
respecting the correct polarity

containers for disposal

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

2. GENERAL DESCRIPTION

HT7003 have the following features:

 AC current measurement up to 300A in Autorange
 Data HOLD
 Auto Power OFF

Function keys DH and ON/OFF are available (see § 6.1 and §

6.2). The selected quantity is displayed with indication of
measuring unit and active functions. The instrument is provided
with an Auto Power Off function consisting in an automatic
switching off 12 minutes after last pressure on keys.

3. PREPARATION FOR USE

3.1 Initial checks

This instrument was checked both mechanically and electrically
prior to shipment. All possible cares and precautions were taken
to let you receive the instrument under perfect conditions.

Notwithstanding we suggest you to check it rapidly (any damage
may have occurred during transport – if so please contact the
local distributor from whom you bought the item).

Make sure that all standard accessories mentioned in § 12.2 are
included. Should you have to return back the instrument for any
reason please follow the instructions mentioned in § 13

3.2 Supply voltage
The instrument is powered by 1x3V button battery type CR2032
included on meter. When battery is low the symbol "BAT"is
displayed. To replace/insert the battery follow the instructions
indicated in § 9

3.3 Calibration
The instrument complies with the technical specifications
contained in this manual and such compliance is guaranteed for
12 months

3.4 Storage

After a period of storage under extreme environmental conditions
exceeding the limits mentioned in § 12.2 let the instrument
resume normal operating conditions before using it

12. TECHNICAL SPECIFICATIONS

12.1 Technical characteristics

The accuracy is referred to 23°C± 5°C, <80%RH

AC Current

Range Resolution Frequency Accuracy (*)

40.00A 0.01A

300.0A 0.1A
Overload protection: 400A AC (300V max) for 1 minute
(*) Frequency response (0  200A / 40Hz  50Hz and 60Hz 500Hz): add
(1.5%rdg+3dgt) to the accuracy
NOTE: for measurement 0A  0.5A add 3 dgt to the accuracy

12.2 General specifications

Reference guidelines
Safety: IEC/EN61010-1, IEC/EN61010-2-32
EMC: IEC/EN61326-1
Measurement category: CAT III 300V
Pollution degree: 2
Insulation: double insulation
Max height of use: 2000m (6562ft)
Compliance with 2004/108/CE (EMC) and 2006/95/CE (LVD)

Display
Characteristics: LCD, 3 ¾dgt, 4000 points + decimal point
Conversion type: mean value
Sampling rate: 2.5 times/s
Over range indication: “OL” symbol at display

Power supply
Battery type: 1x3V button battery type CR2032
Low battery indication: symbol “BAT” at display
Battery life: approx. 70 hours
Auto Power OFF: after 12 minutes of idleness

Environmental conditions for use
Reference temperature: 23°C±5°C (73°F±41°F), <80%RH
Working temp.: 040°C (32°F  104°F), <80%RH
Storage temperature: -10  50°C (14°F  122°F), <70%RH

Mechanical characteristics
Dimensions (LxWxH): 150x52x24mm (6x2x1in)
Weight (with battery): 110g (4 ounces)
Max diameter cable: 27mm (1in)

Standard accessories

 Battery
 Carrying bag
 User manual

50Hz  60Hz (1.8%rdg+5dgt)

4. INSTRUMENT AND DISPLAY DESCRIPTION

5. SAFETY LINE

Put the cable as close as possible to the middle of the jaws in order
to meet the meter accuracy specifications and take the hand under
the safety line (see below figure)

13. SERVICE

13.1 Warranty conditions

This instrument is guaranteed for one year 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.

The warranty shall not apply in the following cases:
 Repair and/or replacement of accessories and battery (not

covered by warranty).

 Repairs that may become necessary as a consequence of an

incorrect use of the instrument or due to its use together with
non-compatible appliances.

 Repairs that may become necessary as a consequence of

improper packaging.

 Repairs which may become necessary as a consequence of

interventions performed by unauthorized personnel.

 Modifications to the instrument performed without the

manufacturer’s explicit authorization

 Use not provided for in the instrument’s specifications or in the

instruction manual

13.2 Service

Should the instrument not work properly, make sure that battery is
correctly installed and working and replace if necessary before
contacting your distributor. 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
not original packaging will be charged anyhow to the customer. The
manufacturer will not be responsible for any damage to persons or
things

HT ITALIA SRL
Via della Boaria, 40
48018 – Faenza (RA) – ITALY
Tel: [phone]
Fax: [phone]
Web: www.ht-instruments.com
Email: [e-mail]