HT instruments M70 User Manual
ENGLISH
User manual
Copyright HT ITALIA 2014 Release EN 2.01 - 13/01/2014
M70
Table odf Contents
1. SAFETY PRECAUTIONS AND PROCEDURES .......................................................... 2
1.1. Preliminary instructions ..................................................................................................... 2
1.2. During use ......................................................................................................................... 3
1.3. After use ............................................................................................................................ 3
1.4. Overvoltage categories - definitions .................................................................................. 3
2. GENERAL DESCRIPTION ........................................................................................... 4
2.1. Features ............................................................................................................................ 4
3. PREPARATION FOR USE ........................................................................................... 4
3.1. Preliminary checks ............................................................................................................ 4
3.2. Power supply ..................................................................................................................... 4
3.3. Calibration ......................................................................................................................... 4
3.4. Storage .............................................................................................................................. 4
4. OPERATING INSTRUCTIONS ..................................................................................... 5
4.1. Instrument - Description .................................................................................................... 5
4.1.1. Switch on of meter ...................................................................................................................... 5
4.1.2. Auto Power OFF ......................................................................................................................... 5
4.1.3. Backlight ..................................................................................................................................... 5
4.2.
4.2.1. Anomalous cases which may occur during measurements ..................................................... 6
: DC voltage measurement ............................................................................................ 6
4.3. : AC voltage measurement ............................................................................................. 7
4.3.1. Anomalous cases which may occur during measurements ..................................................... 7
4.4.
4.4.1. "ZERO" mode ............................................................................................................................. 8
4.4.2. Anomalous cases which may occur during measurement ................................................. 9
: Resistance measurement and continuity test ........................................................... 8
4.5. Lo: Continuity test on earth, protective and equalizing potential conductors ................ 10
4.5.1. "ZERO" mode ........................................................................................................................... 11
4.5.2. Anomalous cases which may occur during Lo measurement ............................................... 11
4.6. M: Insulation resistance measurement test voltage 250V, 500V, 1000V DC ............... 12
4.6.1. Measurement time setting mode .............................................................................................. 13
4.6.2. Anomalous cases which may occur during M tests ............................................................... 13
5. MAINTENANCE ......................................................................................................... 14
5.1. General............................................................................................................................ 14
5.2. Battery replacement ........................................................................................................ 14
5.3. Cleaning .......................................................................................................................... 14
5.4. End of life ........................................................................................................................ 14
6. TECHNICAL SPECIFICATIONS ................................................................................ 15
6.1. Characteristics ................................................................................................................. 15
6.1.1. Electrical ................................................................................................................................... 16
6.1.2. Safety standards ....................................................................................................................... 16
6.1.3. General specifications .............................................................................................................. 16
6.2. ENVIRONMENT .............................................................................................................. 16
6.2.1. Environmental conditions ......................................................................................................... 16
6.3. ACCESSORIES .............................................................................................................. 16
6.3.1. Standard accessories ............................................................................................................... 16
7. SERVICE .................................................................................................................... 17
7.1. Warranty conditions ......................................................................................................... 17
7.2. After-sale service ............................................................................................................. 17
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M70
1. SAFETY PRECAUTIONS AND PROCEDURES
This instrument complies with safety IEC/EN61557-1 and IEC/EN61010-1 guidelines
related to electronic measuring instruments.
CAUTION
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 .
When taking measurements:
Avoid doing that in humid or wet places - make sure that humidity is within the limits
indicated in section “environmental conditions”. Avoid doing that 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 liquid, blind display etc.
Be particularly careful when measuring voltages exceeding 25V in particular places
(building yards, swimming pools, etc.) and 50V in ordinary places to avoid risks of
electrical shocks.
The following symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components
DC voltage
AC voltage
Danger high voltage: risk of electric shocks.
Double insulated meter.
1.1. PRELIMINARY INSTRUCTIONS
This instrument has been designed for use in environments of pollution degree 2
It can be used for tests on electrical installations of overvoltage category III 265V and
550V maximum rated interlinked voltage (and to earth)
You are recommended to respect the usual safety regulations aimed at protecting you
against dangerous currents and protecting the instrument against improper use
Only the original test leads supplied along with the instrument guarantee compliance
with the safety Standards in force. They must be in a good conditions and, if
necessary, replaced with identical ones
Do not test nor connect to any circuit exceeding the specified overload protection
Do not take measurements under environmental conditions exceeding the limits
indicated in this manual
Make sure that batteries are correctly installed
Before connecting the test probes to the installation make sure that the right function is
chosen.
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1.2. DURING USE
Read the recommendations which follow and the instructions in this manual:
CAUTION
An improper use may damage the instrument and/or its components or injure
the operator.
Before selecting any function, first disconnect the test leads from the circuit under test
When the instrument is connected to circuits never touch any unused terminal
Do not measure resistance in presence of external voltages; although the instrument is
protected, an excessive voltage may cause malfunctioning.
CAUTION
If the “low battery” symbol is displayed during use interrupt testing and replace
batteries following the procedure described in § 5.2.
1.3. AFTER USE
Disconnect the test leads from the circuit under test and switch off the instrument
If you expect not to use the instrument for a long period remove batteries.
1.4. OVERVOLTAGE CATEGORIES - DEFINITIONS
Standard IEC/EN61010-1 (Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements) defines what a measurement
category (usually called “overvoltage category”) is. At § 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.
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2. GENERAL DESCRIPTION
Dear Customer, the instrument you have purchased, whether used according to the
instructions given in this manual, will grant you accurate and reliable measurements.
Thanks to a development of newest conception assuring double insulation and overvoltage
category III you will enjoy the highest safety.
2.1. FEATURES
1000V - M: insulation resistance measurement with test DC voltage of 1000V
500V - M: insulation resistance measurement with test DC voltage of 500V
250V - M: insulation resistance measurement with test DC voltage of 250V
Lo: continuity test on earth, protective and potential equalising conductors
with a test current higher than 200mA and open voltage ranging from
4V to 24V
: measurement of resistance / continuity with sound signal
: AC voltage measurement
: DC voltage measurement
3. PREPARATION FOR USE
3.1. PRELIMINARY 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 in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages 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 § 6.3. are
included. Should you have to return back the instrument for any reason please follow the
instructions mentioned in § 7.
3.2. POWER SUPPLY
The instrument is powered by 4x1.5V batteries type AA LR6. When batteries are low, a
low battery indication is displayed. To replace/insert batteries follow the instructions
indicated in § 5.2.
3.3. CALIBRATION
The instrument complies with the technical specifications contained in this manual and
such compliance is guaranteed for 1 year. Annual recalibration is recommended.
3.4. STORAGE
After a period of storage in extreme environmental conditions exceeding the limits
mentioned in § 6.2.1 let the instrument resume normal measuring conditions before using
it.
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4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT - DESCRIPTION
CAPTION:
1. Inputs
2. Inputs
3. Display
4. ON/OFF key
5. LOCK key
6. ZERO and backlight key
7. GO key
8. FUNC HOLD key
Fig. 1: Instrument description
key to switch on/off the instrument
LOCK key to select the continuous mode measurement and to set the
insulation measurement time
ZERO key to calibrate the cables being used
key to on and off the backlight
GO
GO key to start a measurement
ARROW keys to select measurements
4.1.1. Switch on of meter
When the instrument is turned on all display segments are lit for just a while. Then the
instrument is ready for DC voltage measurement.
4.1.2. Auto Power OFF
The instrument automatically turns off 15 minutes after last pressure of keys. To resume
operation turn on the instrument again. When the instrument must be used for long voltage
measurements, the operator may need to disable the auto power off function. In order to
do so press the LOCK key. On next switch on autopower off will be automatically restored.
On the instrument’s LCD the symbol is displayed only when auto power off is active.
4.1.3. Backlight
Press ZERO key to activate backlight function in any position of selector. This function is
automatically off after about 30s or pressing again ZERO key.
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