5.2. General data ............................................................................. 17
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DIGIOHMpro
1.INTRODUCTION
1.1. Safety
Read this User’s Manual carefully and completely and follow all
instructions contained therein. Otherwise using of the instrument
may be dangerous for operator, for installation under test under
test or for the instrument!
Explanation of the symbols on the instruments:
Protection class (double insulation).
Danger of electric shock.
Warning concerning a point of danger!
Read User’s Manual and observe all precautions!
The instrument meets the requirements of relevant European standards.
If there is reason to believe that safe operation has become impossible,
put the instrument out of operation and secure it against any unintended
operation. Safe operation must be presumed to be no longer possible, if:
•The instrument does not operate properly any longer. In this case, we
recommend RESET as described in the Chapter 3.6.
•The instrument, cables, connectors, plugs or accessories exhibits visible
damages.
•The instrument was stored under unfavourable conditions for a long period.
•The instrument was exposed to extraordinary stress caused by transport.
•The batteries / fuse compartment cover is not properly fastened by both
screws.
Observe the following safety precautions:
•Make sure that the instrument, measuring cables and all other accessories
are in flawless condition, e.g. no damaged insulation, no broken cables or
plugs etc.
•Do not touch conductive parts of test tips, crocodiles, test cables etc., even if
only one test tip, crocodile, test cable etc. is connected to installation.
DANGER OF ELECTRIC SHOCK!
•Use only standard or optional accessories supplied by your distributor (see
chapters 2.3 and 2.4).
•It is necessary to respect all safety regulations applicable to particular
measurement.
•Do not press any key (unless otherwise stated in this manual) when
connecting the instrument to the measured installation.
•Do not expose the instrument to aggressive gases, vapours, liquids and dust.
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DIGIOHMpro
•The instrument can be used only under conditions that are specified in
Technical Specification, see Chapter 5.
•If you have transferred the unit from cold to hot environment, it can cause the
condensation. We recommend a short acclimatization
•If the instrument will be out of operation for a longer time (about 1 month or
more), it is strongly recommended to remove the batteries. This prevents the
possibility of leakage into the device. Leakage can cause serious damage or
to destroy the instrument.
•The instrument contains two fairly strong magnets. Do not leave them near
the equipment and items that could be damaged by the magnetic field - such
as watches, credit cards with magnetic strips, etc.
•Images in this manual are illustrative and may vary slightly from the actual
state.
1.2. General description of the instrument
The DIGIOHMpro is a compact instrument with patent-protected storage system
of the test tips in the transport position – sharp tips are safely hidden.
High contrast bright multicolour graphic OLED display ensures excellent
legibility. When measured under low light conditions it is possible to illuminate
the measured object by a bright white LED light positioned on the front side of
the housing.
The DIGIOHMpro can measure:
- Continuity (low resistance)
- AC/DC voltage
- Single-pole phase (live) conductor test
- Contactless indication of AC voltage
- Phase sequence test
- Distinguish deenergized conductors by means of the transmitter DIGIsort
(optional accessories)
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DIGIOHMpro
1.3. Standards applied
Measurements:EMC:Safety:
EN 61557-4 EN 55022, class BEN 61010-1
EN 61326-1 EN 61010-2-031
EN 61000-4-2,3,4,5,6
1.4. Ecology
Shipping case
It is made of cardboard and is recyclable. Please hand it to a collection point of
secondary raw materials in accordance with local regulations.
Batteries
Please dispose of used batteries in the designated locations in accordance with
local regulations.
The instrument
This symbol on the product, packaging or the accompanying
documentation indicates that the product should not be dispose of in
municipal waste.
Please dispose of it in accordance with local regulations.
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DIGIOHMpro
2.DESCRIPTION OF THE INSTRUMENT
2.1. Instrument’s case
test tip on instrument’s case
LED
OLED display
control panel
instrument’s
case
•Use original
accessories only!
•Max allowed
voltage between
test tip and ground
is 300V!
•Max allowed
voltage between
test tips is
460VAC/650VDC!
movable test tip
movable test tip’s
banana
Fig. 2.1. Top side
sliding
protective
cover
socket for
accumulator’s
charger
terminal for
connecting of
movable test tip
When not in use, the instrument’s body and the movable test tip can slide one
into another in such a way that they form a compact unit, while the sharp end of
the measuring tips are safely hidden. Against accidental ejection are both parts
secured by non-contact magnetic latch.
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DIGIOHMpro
screws securing the batteries / fuse
compartment cover
Fig. 2.2. Detail of bottom side
information labelthe batteries / fuse
2.2. Control panel and OLED display
Graphical OLED display
The START key. Hold it until the instrument
is switched on. The instrument is turned off
after two short pressing/releasing.
LED can be switched on/off by briefly
pressing and releasing.
The U/R/●› key. It toggles between
measurement of voltage, resistance
and beeper functions.
compartment cover
The FUNC key. It toggles between
one-pole phase, phase rotation and
DIGISORT functions.
The RANGE key. It selects a certain range,
thus disable and eventually re-enable
auto-ranging on resistance measurement.
The CAL/ELEC key. On resistance
measurement it is used for test lead resistance compensation.
On voltage measurement it loads measured circuit with load resistor approx.
280kΩ.
Fig. 2.3. Control panel and OLED display
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DIGIOHMpro
2.3. Included in the set
DIGIOHMpro
Twisted test lead with measuring tip
Pouch
User’s Manual
Calibration Certificate
Cardboard shipping case
2.4. Optional accessories
P 5050 – adapter for charging accumulators
P 5060 – set of 4 NiMH AAA accumulators
P 2011 – test lead, black, 2 m
P 3011 – test tip, black
P 4011 – crocodile clip, black
P 8060 – transmitter DIGIsort enables to distinguish deenergized conductors
Note: optional accessories P 2011 + P 3011, respectively P 2011 + P 4011 can
be connected instead of twisted test lead with measuring tip.
2.5. Putting the instrument into operation
Putting the instrument into operation consists of inserting the batteries or
accumulators - the procedure is described in the Chapter 4.1. of this manual.
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DIGIOHMpro
3.MEASUREMENTS
3.1. Turning the instrument on and off, standby, auto power off
Hold the
The instrument is turned off after two short pressing/releasing the START key.
The instrument enters standby mode (reduced display brightness) after short
time of inactivity (no key pressed, no voltage applied on the test tips).
From standby mode (to full display brightness), the instrument enters after
pressing any key or by applying the voltage on the test tips.
Auto power off occurs when the instrument is idle (no key pressed, no voltage
applied on the test tips) for about a minute.
After turning off the device can be switched on again after about 1s.
START
key pressed until the device turns on.
3.2. Notes and principles applicable to all measurements
•Use only charged NiMH batteries, or the quality alkaline batteries. If you see
a low battery indicator or if there are other problems, for example
spontaneous shutdown of the instrument, display flickers, malfunction of
control keys etc., insert new fully charged NiMH batteries, or the quality
alkaline batteries. See chapter 4.1 for instructions how to do it.
•If the device measures the voltage and if resistance is not measured, check
the fuse, which is located under the batteries / fuse compartment cover. See
chapter 4.1 for instructions how to do it.
3.3. Voltage and resistance measurement
Repeatedly press and release the U/R/●› key to select between the following
measurement functions:
3.3.1. Function U
The “U” function is for voltage measurement.
•Voltage measurement function is selected whenever you turn on the
instrument. (Repeatedly) press and release the U/R/●› key, if other function is
selected and you need to measure voltage.
•Connect test tips to measured voltage. The measured value is displayed. The
symbol "~" is displayed in the case of AC voltage. Polarity symbol is
displayed in the case of DC voltage; if the positive pole is connected to the
test tip on instrument’s case, it is indicated by "+", the negative pole is
indicated by "-" symbol.
•The CAL/ELEC key activates and deactivates the "ELEC" function; if the
function is activated the load resistor approx. 280kΩ is connected to
measured circuit. If this feature is enabled, the display shows "ELEC".
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DIGIOHMpro
3.3.2. Function R
The “R“ function is for continuity (low resistance) measurement.
Measurement:
•Check that there is no external voltage applied on measured resistance (see
chapter 3.3.1. - function U).
•Press and release the U/R/●› key to select R function. Measured resistance
value is displayed or "---- Ω" is displayed if measured value is > 200Ω.
•Resistance measurement is blocked in the following cases:
•external voltage is applied on test tips
•external voltage is on the measured resistor (caused by flowing of an
external current through the measured resistor)
•the voltage induced in the measuring wires, which are unconnected
This is indicated by 5x beeps; the symbol "Uin" is displayed, too. The instrument
remains in voltage measurement function U. To switch it to R function is possible
after disconnecting the voltage from the test tips.
If an external voltage appears on measure resistance during measurement, this
state is indicated by the "Uin" message on display and by continuous beeping.
Test lead resistance compensation (calibration)
It is recommended to carry out test lead compensation before measurement.
After test lead resistance compensation is carried out, it is automatically
subtracted from all resistance measurements and thus only actual value of
measured resistance is displayed.
•Short the test tips. After displayed value is stabilized, press and release the
CAL/ELEC key. It is signalized by yellow "Cal" message.
If the resistance value during measurement is greater than or equal to
compensation value, the message "Cal" remain lit (not blinking).
If the resistance value during measurement is lower than compensation
value, the word "Cal" is blinking and it is necessary to repeat the test leads
resistance compensation.
•The compensation value is permanently stored until a new compensation or
cancellation of compensation is carried out. Carry out new compensation
always after connecting new test wires, crocodile clips, test tips etc. to the
instrument. It is not necessary to carry out new compensation after switching
off the instrument or after removing and reinserting the batteries.
Cancellation of test lead resistance compensation
Press and release the CAL/ELEC key when test tips are either open or
connected to resistance greater then 4 Ω. Compensation is cancelled. It is
signalized by blue "X CAL" message.
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DIGIOHMpro
Manual range selection
•After entering the R function measuring range is chosen automatically.
•If necessary, you can press and release the RANGE key to select a certain
range, thus disable and eventually re-enable auto-ranging.
Important notices for resistance measurement
- Do not connect test tips to external voltage in the R function. Such status is
indicated by beeper and the symbol "Uin", but despite it the instrument can be
damaged!
- Measurement of low resistance with 200 mA current heavily loads the supply
accumulators /batteries of the instrument. Carry out resistance measurementonly for necessary period of time. If you see a low battery indicator or if there
are other problems, for example spontaneous shutdown of the instrument,
display flickers, malfunction of control keys etc., insert new fully charged NiMH
batteries, or the quality alkaline batteries. See chapter 4.1 for instructions how to
do it.
3.3.3. Function "●›)" - beeper
The „●›)“ function is intended for measurement of resistance in range 0 - 4 Ω. If
measured value is between 0 - 4 Ω, it is signalized by beeper. Follow the same
measuring procedure and consider the same warnings that are stated for the
resistance function R (see chapter 3.3.2.).
Repeatedly press and release the FUNC key to select between the following
measurement functions:
3.4.1. Single-pole / contactless phase indication
This function is suitable for contactless indication of the presence of voltage on
conductor / device and contact single-pole indication of the phase conductor.
•Press and release the FUNC key to select the phase indication function. The
right side of the display briefly displays bar graph "-------------" and the left side
displays "X" on a blue field.
•Approaching the test tip on the instrument’s case to the conductor / device
under voltage bar graph indicates the growing intensity of the electric field.
•Sensitivity can be switched in two steps by the RANGE key.
•Acoustic signalization can be switched on / off by the CAL / ELEC key
•Touching the test tip on the instrument’s case to the measured conductor with
voltage ≥ 190 V / 48 ÷ 52 Hz against the earth, the "L" symbol is displayed on
the left side of the display.
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DIGIOHMpro
Important notices for proper indication of phase
- This function can only be used in TT and TN systems!
- Hold the instrument in your hand (palm) in a standard way.
- For correct function of phase indication it is necessary that the test tip is
connected to the phase voltage for at least 2!
- The voltage must be ≥ 190 V / 48 ÷ 52 Hz against the earth, otherwise phase
indication may not work properly!
- Verification of live-circuit shouldn’t be depending on the single-pole phase test
only, but on the voltage measurement (the U function)!
3.4.2. Phase sequence test
This function is intended for testing of phase sequence (rotation).
•Press and release the FUNC key to select the phase sequence test function.
"1 -" is displayed.
•Connect the test tips between two phases. "1 - 2" is displayed.
•After about 2 seconds, the display shows a moving symbol "1 - 2 _ _ _ 3".
•Disconnect the test tip on the instrument’s case from second phase
conductor and connect it immediately to third phase conductor. The display
shows the phase sequence "1 - 2 - 3" or "1 - 3 - 2" and the symbol of a
rotating wheel in the direction of the expected phase rotation. Displaying is
finished after about 10 seconds after the test tips are disconnected from the
tested mains.
•The voltage value is displayed during the test, too.
Important notices for proper indication of phase sequence
- Connect the test tips with tested conductors thoroughly and steadily.
- Phase voltage must be 230 ±10% / 48 ÷ 52 Hz.
3.4.3. Function DIGISORT (with DIGIsort optional transmitter only)
The „DIGISORT“ function is intended for distinguishing of up to 12 deenergized
conductors.
•Choose one conductor as common conductor, for example cable shielding or
protective conductor.
•Ensure by voltage measurement that all conductors are disconnected from
the power supply!
•On the opposite end of the bundle of conductors connect the transmitter
DIGIsort. Terminal "GND" connect to dedicated common conductor, terminals
1-12 to other conductors. Turn on the power of DIGIsort.
•Select on the DIGOHMpro function "DIGISORT" by the FUNC key. In the
upper part of the display there is displayed "DIGISORT" and in the lower part
"- - -".
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DIGIOHMpro
•Connect one test tip to the designated common conductor. Then touch with
the second test tip a conductor, then another conductor etc. DIGIOHMpro
always displays the number of conductor corresponding to the numbered
terminal of the DIGIsort on the opposite end.
Important notices for proper function of the DIGISORT function
- The presence of voltage on the conductors is indicated by the "Uin" message
on the display. In this case, immediately disconnect the transmitter DIGIsort –
risk of damage!
- The length of conductor > 300 m, too high capacitance, high induced voltage
etc. may cause malfunction of the DIGISORT function!
3.5. Other functions of the instrument
Illumination of measurement point with white LED
LED can be switched on/off by briefly pressing and releasing the START key.
Note: The test tips have to be without applied voltage.
3.6. RESET of the instrument
If the device does not operate as described in this manual, we recommend
RESET: disconnect both test tips from tested object and turn off the instrument.
It the proper function is not restored after turning on the instrument, than turn it
off again, remove batteries (the procedure is described in chapter 4.1), wait at
least 10 seconds, and then insert them into the instrument again.
If problems persist, e.g. a spontaneous shutdown of the instrument, flickering of
the display, malfunction of control keys etc., insert a new fully charged NiMH
batteries, or new high quality alkaline batteries.
If the instrument measures the voltage and if resistance is not measured, check
the fuse, which is located under the batteries / fuse compartment cover. See
chapter 4.1 for instructions how to do it.
If the instrument still does not work properly, put the instrument out of operation,
remove batteries (the procedure is described in chapter 4.1), secure it against
any unintended operation and contact your distributor or service.
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DIGIOHMpro
4. MAINTENANCE
4.1. Batteries and fuse replacement
Dangerous voltage in batteries / fuse compartment!
Disconnect both test tips from test ed object and t urn off the
instrument before removing the batteries / fuse compartment
cover or before connecting jack to the socket for accumulator
charger!
The instrument must not be put into operation without the
batteries / fuse compartment cover properly fastened by both
screws!
The instrument uses four AAA either alkaline cells or NiMH accumulators.
The batteries / accumulators are continuously monitored, see description in the
Chapter 3.2. If batteries/accumulators are low, it must be replaced / charged.
4.1.1. Inserting and replacing the batteries / accumulators
Batteries/accumulators are inserted into the device by unscrewing two screws
and removing the batteries / fuse compartment cover, see Fig. 2.2. Then remove
old batteries/accumulators and insert new ones. Observe correct polarity:
Fig. 4.1 Correct batteries / accumulators polarity and the fuse location
Always replace all four batteries / accumulators. Use only high-quality types.
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DIGIOHMpro
4.1.2. Charging of accumulators
For charging of accumulators use only adapter supplied as
optional accessories!
Accumulators are charged as soon as the adapter is connected to mains and to
socket for accumulators charger (see Fig. 2.1). If accumulators are fully
discharged, the charging takes about 6 hours (applies to batteries with a
capacity of 800 mAh). Prolonged charging is not a problem; however, do not
charge accumulators for more than 12 hours.
Notes:
•Do not charge alkaline cells – it may lead to explosion, leakage, etc. This can
cause serious damage or destruction of instrument.
•During charging of new accumulators or ones that were unused for a longer
period (few months) unpredictable chemical processes may arise. As a result,
the instrument operation time can be significantly reduced. In this case, we
recommend several charge (with optional charger) / discharge (normal use of
the instruments) cycles.
Another way is to use a stand-alone intelligent charger which discharge /
charge each cell individually. The discharge / charge cycle is automatically
executed, see instruction manual for the charger used.
After the procedure, the capacity of the accumulators should return to normal.
The above described cycle in stand-alone intelligent charger is recommended
every few months to make.
•If after several cycles of the above described discharge / charge capacity of
the accumulators does not return to normal, this may be due to the fact that
the one or more accumulators are degraded - whereas, the built-in
accumulator charger charges all cells connected in series at the same time,
and even one bad (or just different) cell negatively affects the entire
accumulator pack.
It may result in uneven charging of cells, excessive heating of the cell(s)
during charging etc.
In this case, we recommend that a faulty cell is identified with an intelligent
stand-alone charger, or at least comparing the voltage of each cell and then a
faulty cell replace with a new one.
•The above-described effects can not be confused with a normal reduction in
accumulators’ capacity over time. All accumulators with a growing number of
charge / discharge cycles gradually loose capacity. This is normal, depending on
accumulator type, the number and parameters of the discharge / charge cycles.
4.1.3. Replacing the fuse
Replace the fuse by the same type only:
GF F0.5A/500V, breaking capacity 1500A, dimensions 32x6,3mm.
Using of another type of fuse can cause damage of the
instrument and/or operator’s safety can no longer be guaranteed!
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DIGIOHMpro
For replacing the fuse unscrew two screws and remove the batteries / fuse
compartment cover, see Fig. 2.2. Then remove blown fuse from the fuse holder
(see Fig. 4.1) with a suitable tool (e.g. a small screwdriver) and put in its place
the new fuse. Then put the batteries / fuse compartment cover back and secure
it with two screws. Verify the instrument’s functionality.
4.2. Cleaning
Disconnect both test tips from tested object and turn off the
instrument before cleaning!
Wait until the instrument becomes totally dry before using it!
Use soft cloth, slightly moistened with lukewarm soap water for plastic case
cleaning. Do not spill cleaning liquid over the instrument!
Do not use cleaning liquids based on petrol, hydrocarbons etc.!
4.3. Calibration
Measuring instruments should be regularly calibrated. We recommend interval of
calibration 1 year. Furthermore we recommend carrying out calibration after
each repair. Contact your local distributor for further information.
Contact your local distributor for further information.
Unauthorized persons are not allowed to open the instrument.
There are no replaceable components inside the instrument, except batteries
and the fuse, refer to the Chapter 4.1.
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DIGIOHMpro
5. TECHNICAL SPECIFICATION
5.1. Functions
Continuity
Operating range of use according to EN 61557-4: 0,028 Ω ÷ 200 Ω.
Test current ≥ 200 mA at R ≤ 2 Ω.
Measuring
range (Ω)
0,000 ÷ 4,0000.001
4,00 ÷ 20,000.01
20,0 ÷ 200,00,1
Resolution (Ω)Reference errorOperating error
DC voltage
Measuring range
(V)
0,000 ÷ 2,0000.001
2,00 ÷ 43,00
43,0 ÷ 650,00.1
Resolution (V)Reference errorOperating error
0.01
AC voltage (TRMS value)
Measuring range
(V)
0,000 ÷ 2,0000.001
2,00 ÷ 30,00
30,0 ÷ 460,00.1
Resolution (V)Reference errorOperating error
0.01
±(3 % z MH + 5 D)±(4 % z MH + 7 D)
±(2 % z MH + 5 D)±(3 % z MH + 7 D)
±(2 % z MH + 4 D)±(3 % z MH + 6 D)
±(3 % z MH + 10 D)±(4 % z MH + 12 D)
±(2 % z MH + 5 D)±(3 % z MH + 7 D)
±(2 % z MH + 5 D)±(3 % z MH + 7 D)
±(3 % z MH + 10 D)±(4 % z MH + 12 D)
±(2 % z MH + 6 D)±(3 % z MH + 8 D)
±(2 % z MH + 6 D)±(3 % z MH + 8 D)
Specified accuracy is valid for THD < 2 %
Frequency range 48 ÷ 52 Hz.
Notes to the parameters stated in chapter 5.1:
a) Stated accuracy of Continuity measurement is valid only if no parallel circuits
are connected to measured resistance.
b) Thresholds of auto-ranging may differ from the stated values.
c) R... Reading, D... Digit.
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DIGIOHMpro
5.2. General data
Power supply4x AAA alkaline battery 1,5 V or NiMH accumulator 1,2 V
Over voltage class:
- protective caps of the test tips insertedCAT III 300 V
- protective cap(s) of the test tip(s) removed CAT II 300 V
Pollution degree2
Protective classII (double insulation)
Degree of protectionIP 40
Dimensionsabout 255x70x40 mm
Weight including batteries and movable test tipabout 0,36 kg
Maximum altitude for use of the device2000 meters
Reference conditionsambient temperature (23 ± 2) °C
relative humidity 40 ÷ 60 % (non condensing)
mains voltage 230 V ± 2 % / 50 Hz ± 1 %
instrument’s position arbitrary
Operating conditionsambient temperature 0 ÷ 40 °C
relative humidity max. 85 % (non condensing)
mains voltage 190 ÷ 260 V / 48 ÷ 52 Hz
instrument’s position arbitrary
Storage conditionsambient temperature -10 ÷ +70 °C
relative humiditymax. 90 % (-10 ÷ 40) °C
(non condensing)max. 80 % (40 ÷ 70) °C
instrument’s position arbitrary
Note:
The instructions for use of the instrument in this manual are current when
delivered together with the instrument, but may not match the older or newer
version of the instrument’s firmware.
Firmware can also be updated during calibration and repair of the instrument.
Updating the firmware can cause changes and / or additions to the device
functions so we recommend checking the validity of the manual on www.illko.cz
in relation to the firmware version.