PHYWE ADM 3 User manual

1
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Operating instructions
PHYWE Demo multimeter ADM 3:
current, voltage, resistance, temperature
13840-00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
37079 Göttingen
Germany
Telefon [phone]
Fax [phone]
E-mail [email protected]
Internet www.phywe.com
Fig. 1: PHYWE Demo multimeter ADM 3, 13840-00
TABLE OF CONTENTS
1SAFETY PRECAUTIONS
2PURPOSE AND INTENDED USE
3FUNCTIONAL AND OPERATING ELEMENTS
4OPERATING INSTRUCTIONS
5HANDLING
6DISPLAY-CONNECT AND FIRMWARE UPDATE
7TECHNICAL DATA
8SCOPE OF SUPPLY
9ACCESSORIES
10REPLACING THE OVERLOAD SAFETY DEVICE
11WARRANTY
12DISPOSAL
13CLEANING
14EXPLANATION OF THE SYMBOLS
1 SAFETY PRECAUTIONS
The instrument complies with the safety requirements of
DIN EN 61010-1. The instrument can be used safely and
without risk if the following safety instructions are
strictly adhered to.
 Read the operating instructions thoroughly and com-
pletely prior to starting the instrument. This is important
for your own protection and for avoiding damage to the
instrument.
 In the event of a change of ownership, these operating
instructions must be handed over with the instrument.
 Use the instrument only for its intended purpose. Do not
exceed the maximum values stated in section 7
„Technical data“.
 If the instrument is switched off by manual selection of
the "OFF" mode or if it is switched off automatically due
to standby or for deep-discharge protection, the measur-
ing leads must be disconnected.
 The instrument is solely intended for use in dry rooms
where there is no risk of explosion.
 Position the instrument on a table in an upright position
for using or charging it.
 The handle is solely intended for transporting the
switched-off instrument to its location of use. Do not
swing the instrument around when transporting it.
 Do not open the instrument. Only PHYWE is authorised
to change the batteries.
 Only use the approved accessories.
 Do not connect any devices to the instrument other than
the ones that are intended for this purpose.
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ttention!

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 Prior to opening the back panel, it is mandatory to switch
the instrument off and to disconnect all of the measuring
leads.
 Do not use the instrument unless its housing is closed
and undamaged.
 The prepared aerial cut-out in the cover (16) must only
be opened up if the instrument is used in combination
with a Cobra4 Display-Connect radio receiver.
 When measuring voltages above 30 V, only use connect-
ing leads with safety connectors (safety connecting leads
with fixed insulating sleeves). For voltages above 300 V,
only use high-voltage-resistant leads.
 Voltages above 300 V must only be fed in via the
kV socket. These voltages must be non-hazardous (i.e.
safe to touch). See the description of non-hazardous
voltage in section 5.9 “Overload protection”. Perform the
measurement in battery mode with the power supply un-
plugged. Only use frequencies ≤50 Hz.
 Ensure that no liquids or objects penetrate the instrument
through its slots.
 Protect the instrument against shocks, dust, moisture
vapours, direct exposure to sunlight and extremely high
temperatures.
 Clean the instrument only with a slightly moist, lint-free
cloth. Do not use any aggressive cleaning agents or sol-
vents.
 Do not use the instrument if you notice signs of damage
to the instrument, power supply unit, mains power cable
or measuring leads. Do not use the instrument if it does
not work correctly.
2 PURPOSE AND INTENDED USE
The PHYWE Demo multimeter ADM 3 is a modern, universal
multi-range meter that has been specifically developed for
teaching purposes. The integrated measuring amplifier en-
ables voltage and current measurements over an extremely
wide range. Additionally, measurements of resistance and
temperature are possible.
The instrument is characterised by a high input resistance in
terms of the voltage measuring ranges and a particularly
small voltage drop in terms of the current measuring ranges.
It has nine selectable scales, one of them with central zero
and one for resistance measurements. In addition, all of the
measurements can also be displayed as digital numbers.
The instrument is designed for measuring applications in test
and measuring circuits that are connected to the mains
power supply directly or indirectly. For test and measuring
circuits, that are connected to the mains power supply di-
rectly, the instrument is designed for measurement cate-
gory II 300 V (abbrev. CAT II 300 V). Allowed are measure-
ments in circuits that are connected via a single-phase power
plug to the low voltage system installation (incl. overcurrent
protective element).
Do not perform measurements of the building wiring in-
stallation. (e.g. fuse box, electric meter, service box, low
voltage overhead lines)!
3 FUNCTIONAL AND OPERATING ELEMENTS
Fig. 2 shows the functional and operating elements at the
front of the instrument and Fig. 3 those at the back.
3.1 Front
Fig. 2: Functional and operating elements, front
1 “Range” scale button
for selecting scales, temperature unit and digital display.
2 “Power” LED
for indicating the operating state:
On: Ready
Flashing: Standby
Off: Rotary switch set to OFF or protection
against deep discharge
3 Display
for displaying the measured values in an analogue or
digital form.
4 Measuring range selector
for selecting the measuring range:
Voltage kV / V / mV – current µA / mA / A – resistance Ω
– temperature θ
5 Operating mode selector
for switching the device off (OFF) and for selecting the
type of current ( (direct current DC) or (alternating
current AC)).
In the case of AC, true root mean square (TRMS) values
are measured. The input signal thereby is not limited to
sinusoidal waves but measures the correct root mean
square value for any given waveform. Also alternating
signals with a share of direct signals are included
(AC+DC measurement).
6 Temperature socket
for connecting NiCr-Ni sensors (type K)
7 4 mm safety socket V, Ω(red)
for V and Ω measurements.
In case of DC voltage, connect the positive terminal here.
8 4 mm safety socket COM (blue)
reference point for the measuring sockets V/Ω, A, kV.
9 4 mm safety socket A (red)
for all current measuring ranges.
In case of DC current, connect the positive terminal here.
10 4 mm safety socket kV (red)
for kV measurements. Alternating voltages only ≤50 Hz.
In case of DC voltage, connect the positive terminal here.
Attention!
67 9
8 10
2
1
4
3
5

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3.2 Back
Fig. 3: Functional and operating elements, back
11 Handle
can be folded out.
12 Charging connector
for connecting the supplied charger.
Only use the charger stated in the chapter 8 ”Scope
of supply” for charging the integrated batteries.
13 Charge status LED
for indicating the charge status of the battery:
yellow/orange: Charging
green: Fully charged (see sec. 4.2 “Charging”)
14 Display
After a change of the unit of measurement (by way of the
measuring range selector), the set scale range and the
measured value together with the unit will be displayed.
15 Fuse holder
for overload protection.
Do not use the instrument unless the fuse holder is
closed!
16 Cover
Do not use the instrument unless the cover is closed
and fully intact!
Prior to removing the cover, switch the instrument off
and disconnect all of the measuring leads. (see sec-
tion 6.1 “Removing the cover”)
Fig. 4: Functional elements below the cover
17 Display-Connect connector
for connecting the Cobra4 Display-Connect radio receiver.
(see section 6.2 “Installing the Display-Connect radio recei-
ver”)
18 USB port
for connecting a PC for a firmware update with the PHYWE
ADM 3 Update Program. (see section 6.5 „Firmware update“)
4 OPERATING INSTRUCTIONS
The instrument fulfils the technical requirements that are
summarised in the current directives of the European Com-
munity.
The connected cables must not be longer than 2 m. Only the
two sockets that are required for a particular measurement
unit must be used.
4.1 Area of application
Near strong high-frequency transmitters, e.g. radio sets, the
operating behaviour of the instrument may exceed the stated
specifications.
The instrument must be used under the supervision of an ex-
pert and in an electromagnetically controlled environment at
research, teaching and training facilities (schools, universi-
ties, institutes and laboratories).
This means that, in such an environment, radio transmission
devices, e.g. mobile phones, should not be used in the direct
vicinity of the instrument.
Electrostatic charges or similar electromagnetic phenomena
(HF, bursts, indirect lightning discharge, etc.) may affect the
instrument so that it will not work within the specified data
range.
The following measures reduce or eliminate any potential in-
terference:
Avoid carpets; provide equipotential bonding; perform the ex-
periments on a conductive, earthed surface, use shields and
shielded cables. Do not use radiofrequency transmitters (ra-
dio sets, mobile phones) in the direct vicinity of the instru-
ment.
After a complete shut-down of the instrument, switch it off
and then on again by way of the operating mode selector (5).
4.2 Charging
The instrument can be charged when it is switched on or off.
During charging, the following symbol will be displayed:
To ensure trouble-free operation and a long service life of the
instrument, the battery must be charged regularly. The oper-
ating time in the battery mode depends on the ambient tem-
perature and selected measuring ranges.
During loading, interference signals are generated which su-
perimpose the measurement signal. It is therefore recom-
mended, especially with small measuring ranges, to measure
exclusively in battery mode.
Attention!
Attention!
Attention!
17 18
5
4
1
14
13
12
11
16
15

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5 HANDLING
5.1 Start-up
To switch the instrument on, select the desired type of cur-
rent with the aid of the operating mode selector (5). It will be
ready for operation after a turn-on period of several seconds.
The measuring range selector (4) and scale button (1) are
used to select the measurement unit and scale and, thereby,
the desired measuring range. After this step, the measuring
circuit can be connected.
5.2 Buzzer
The buzzer is used for signalling the following operating
states:
 Short beep: Overrange, >5-10 % beyond the scale
range.
Display:
Elimination of the problem:
The overrange state must be eliminated by changing
the measuring range (scale) or by reducing the
measured variable!
 Continuous sound: overrange and deactivation of the
measuring amplifier (to protect the device).
The pointer returns to “0”.
Display:
Elimination of the problem:
The overrange state must be eliminated by reducing
the measured variable!
After a waiting period of several minutes, the meas-
uring amplifier can be switched on again by chang-
ing the measuring range (selector 4) or operating
mode (selector 5).
 Continuous sound of the continuity check (
R <50 Ω)
The active buzzer is indicated by a loudspeaker symbol
on the display.
5.3 Continuity check
In connection with the measurement unit Ω (can be selected
by way of the measuring range selector 4), the buzzer can be
activated/deactivated with the operating mode selector (5) for
a continuity test.
Position „DC“: Buzzer off
Position „AC“: Buzzer on
5.4 Temperature measurement
The instrument can indicate the temperature measured by
type K NiCr-Ni sensors. The position of the selector ("AC" or
"DC") is irrelevant for the measurement.
5.5 Standby
To increase the service life of the battery, the instrument is
equipped with an automatic shut-off system that switches the
instrument off approx. 60 minutes after the last intervention
by an operator. The fact that the instrument has been
switched off is indicated by the inactive display and a flashing
"Power" LED (2).
In order to reactivate the instrument, the scale button (1), the
measuring range selector (4) or the operating mode selector
(5) must be actuated.
To switch the instrument completely off, the operating mode
selector must be set to "OFF".
5.6 Battery mode
The instrument can be operated with a connected charger or
by way of the integrated battery.
When there is only approx. 1 hour of battery life left, the fol-
lowing symbol will be displayed:
When the batteries are discharged, the instrument switches
itself off so that there will be no deep discharge and, thereby,
no damage to the batteries. After the automatic shut-off, the
instrument should be switched off with the aid of the operat-
ing mode selector (5) (OFF).
The instrument can be charged for as long as desired. Once
the battery is fully charged, the charge will be maintained.
5.7 Correct measurement of unsmoothed, pulsating DC
voltages and currents
When measuring pulsating DC voltages and currents like the
ones obtained from normal variable transformers with rectifi-
ers, moving coil instruments are subject to a fundamental er-
ror of measurement: These instruments indicate the mean
value instead of the root-mean-square (rms) value. In the
case of a pulsating DC voltage obtained by way of a bridge
rectifier, this mean value is almost exactly 11 % lower than
the rms value.
However, the instrument still enables the exact measurement
of the rms value of pulsating DC voltages and currents. Sim-
ply switch the instrument to the AC mode . In the case of
sinusoidal pulsating measurement signals, the instrument
indicates the exact rms value. The exact rms value is also
obtained in the case of distorted sinusoidal signals. (For pure
DC currents, the operating mode selector (5) should always
be set to since, otherwise, the measurement accuracy will
be reduced.)
5.8 Measurement of non-sinusoidal AC voltages and
currents
To measure AC voltages and currents, the voltages and cur-
rents are rectified in the ADM 3 in the mode by way of a
true RMS-to-DC converter. The advantage of this method is
that, even in the case of signals that deviate substantially
from the sinusoidal form, exact rms values will be displayed.
For signals with a crest factor (this is the ratio of peak value
to RMS value) of 4, hardly any influence of the waveform on
the measurement result can be observed.
5.9 Overload protection
The instrument is equipped with numerous protective devices
to protect it against damage caused nearly all conceivable
types of faults.
Voltage overload
The “V” socket (7) is protected against mains voltage in all of
the measuring ranges and protected by a surge protector
against higher voltages (short-time up to 1kV). For non-
hazardous voltages that are safe to touch, the protective
function is effective up to 10 kV.
The “kV” socket (10) is protected up to 25 kV permanently in
case of non-hazardous voltages.
A voltage is considered to be non-hazardous (i.e. safe to
touch) if it complies with the following conditions (according
to standard DIN EN 61010-1):
 the values are smaller than 33 V
rms
in the case of AC
voltage or
 smaller than 70 V in the case of DC voltage or
 the current (terminated with 2 kΩ) is smaller than 2 mA in
the case of direct current or
 the capacitive charge is smaller than 45 μC (valid up to
U<15 kV) or

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 the stored energy value is smaller than 350 mJ (valid for
U>15 kV).
The PHYWE high voltage power supply units 13671-93 and
13673-93, for example, comply with these limits.
Current overload
The socket„A“ (9) is protected against current overload by
two protective measures: An overload cut-off (thermal cut-off)
and a fuse for high currents. Due to overrange, the measur-
ing circuit “A” will be cut-off not later than 3 s, the measuring
circuits “µA” and “mA” not later than 15 s. Depending on the
overload of the current measuring ranges, a thermo switch
may temporarily disrupt the circuit.
After a cooling period of several minutes, the current meas-
urement function can be reactivated by selecting a new
measuring range (4) or a new operating mode (5). See also
section 5.2 “Buzzer”.
During an overload cut-off, a message concerning the operat-
ing instructions will be displayed:
Additionally to the overload cut-off, the instrument is pro-
tected by a fuse. A defective fuse can be recognised by the
fact that no values are displayed for any of the current meas-
uring ranges. In this case, the fuse must be replaced (see
also section 10 “Replacing the overload safety device”).
5.10 Voltage measurement: behaviour with an open input
If the ADM 3 is used as a voltmeter, it is characterised by an
extremely high input resistance. Even in the most sensitive
voltage measuring range (1 mV), this resistance is as high as
10 MΩ. Since accurate voltage measurements are only pos-
sible if the source resistance is at least 10 times lower than
the input resistance, the instrument opens up a multitude of
new possibilities, especially when measuring low voltages
with a high source resistance. For the same reason, it cannot
be completely excluded that the open input becomes
charged. This is why it is not unusual for the measured value
not to be exactly at zero, especially in the case of the more
sensitive measuring ranges, or even to fluctuate to a certain
extent. To verify the zero setting, simply short-circuit the input
of the device.
6 DISPLAY-CONNECT AND FIRMWARE UPDATE
The connector for installing a Cobra4 Display-Connect RX
receiver (art. no. 12623-01) is located under the cover (16).
In combination with a Cobra4 Display-Connect TX transmitter
(12623-00), all of the values that are measured with a Cobra4
Mobile-Link 2 (12620-10) and any type of Cobra4 sensor can
be displayed directly on the screen of the ADM 3. In this con-
figuration, the ADM 3 is used as a large-scale display so that
all of the students in the classroom can observe the meas-
urement values provided by the external sensor.
In addition, there is also a USB port for service purposes lo-
cated under the cover. This port can be used to load device
updates provided by PHYWE.
6.1 Removing the cover
Ensure that the instrument is switched off and that no
measuring leads are connected.
Position the instrument on a level surface with its front panel
facing down. There are slots on both sides between the cover
and the back panel of the device. (see Fig. 5)
Fig. 5: Slots for removing the cover
Slide a coin into one of the slots and unlock the cover by tilt-
ing the coin outwards. Repeat this on the other side and the
cover will pop out.
6.2 Installing the Display-Connect radio receiver
After the cover has been removed, plug the Display-Connect
device into the 9-pin connector (17) so that the channel se-
lector is visible from the front. (see Fig. 6)
Fig. 6: Plugged-in Cobra4 Display-Connect
The prepared cut-out for the aerial of the Display-Connect
radio receiver in the cover must be opened up. (see Fig. 7)
Fig. 7: Cut-out for antenna of the Display-Connect
To do so, pry out the material still covering the cut-out with
the aid of a small screwdriver. Then, press the cover against
the back panel of the instrument until a clicking sound on
both sides indicates that it is locked in place.
Do not use the instrument unless the cover is closed.
Fig. 8: Instrument with closed cover
6.3 Removing the Display-Connect radio receiver
After the installation of the Display-Connect radio receiver,
the instrument must be used exactly with this configuration,
i.e. with the Display-Connect device and cover.
If the Display-Connect radio receiver is to be removed, the
original delivery state of the instrument must be restored.
This means that an intact original cover (art. no.:
SP-1384000, see the chapter 8 “Scope of supply”) must be
installed.
A
ttention!
Attention!

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6.4 Display-Connect function
Once the Display-Connect interface receives plausible
measurement values, these values will be displayed digitally.
After a timeout, the instrument switches back to its normal
measuring mode.
The LCD at the back shows the message "extern" (external).
The instrument can display a maximum of 2 Display-Connect
measurement values.
The values to be displayed can be selected via the control
panel of the Cobra4 Mobile-Link 2. If no sensor values are
displayed, use the selector switch of the Display-Connect re-
ceiver to select another channel or do so under "Large dis-
play" in the menu of the Mobile-Link 2. See the operating in-
structions of the Mobile Link 2 for details.
6.5 Firmware update
After the cover has been removed (see section 6.1
“Removing the cover”), the USB port (18) for the connection
of a PC is accessible.
The firmware and the scales can be updated with the aid of
the PHYWE ADM 3 Update Program.
Available updates can be found at:
www.phywe.de >> Downloads >> Softwaredownload
Please check whether the update is more recent than the
firmware version of your instrument. Otherwise, an update is
not necessary. The version number of your instrument will be
displayed briefly when the instrument is switched on. To per-
form an update, open the program and follow the instructions
on the screen of the PC.
After the firmware update, remove the USB cable and press
the cover against the back panel of the instrument until a
clicking sound on both sides indicates that it is locked in
place.
Do not use the instrument unless the cover is closed.
7 TECHNICAL DATA
7.1 Measuring ranges
Typical at 25°C, warm-up period of 15 min, in battery mode
Selecto
r
/
unit Measuring
range
Input resistance
(approx.)
A
ccuracy
(DC) (AC)*
kV
1
1 GΩ ±1,5 % EV**
±2 % EV
Limited to ≤50 Hz
3 ±3 % EV
10 ±2 % EV
V 1; 3; 10; 12;
30; 100; 300 10 MΩ ±1,5 % EV ±2 % EV
and for:
1 … 10kHz 2% MV***
10 … 100kHz 30% MV
mV 1; 3; 10; 30;
100; 300 10 MΩ ±1,5 % EV ±2 % EV
µA****
1
330 Ω
±3 % EV ±10 % EV
3 ±10 % EV
±2 % EV
10; 30; 100;
300 ±1,5 % EV
mA****
1
350 mΩ ±1,5 % EV
±3 % EV
3; 10; 30; 100;
300 ±2 % EV
A 1; 3; 10 45 mΩ ±1,5 % EV ±2 % EV
* From 15% of the measuring range end value. To reduce the error, change to smaller measuring range, reference condition 50 Hz
** EV – from measuring range end value
*** MV – from measuring value
**** Depending on the accuracy of the measuring range and the ambient temperature, the device may require a warm-up time of more than
15 min.
A
ttention!

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Selecto
r
/
unit Measuring range
A
ccuracy
Ω
100 Ω
±1 % EV
1 000 Ω
10 kΩ
100 kΩ
1000 kΩ
10 MΩ ±10 % EV
Θ (°C / °F / K)
−200… 0 °C ±2 °C *
0… +200 °C ±1 °C *
+200… +1 200 °C ±5°C *
* Plus measurement error of temperature sensor
7.2 General
Display TFT display
Digits hight Analogous: 15 mm
Digital: 27 mm
Processor ARM Cortex M4
Transducer 24-bit Delta-Sigma
Measuring rate 1000 measurements / s
Control unit at the back 5-digit LCD with floating decimal
point and sign
Digits heigth: 7 mm
Position of use upright
Measuring category CAT II, 300 V max.
Electrical safety DIN EN 61010-1
Rectifier principle ( ) Root-mean-square value
(true RMS-to-DC converter)
Frequency bandwidth ( ) 2 Hz…100 kHz (except range kV
(AC) limited to ≤50Hz)
Signal shape any
Waveshape error
at a crest factor ≤4 ≤0,5 % of the indicated value
Setting time ~ <4 s
Maximum load capacity of the measuring ranges
Voltage 300 V in socket „V, Ω“ and
10 kV ≤2 mA in socket „kV“
Current 10 A in socket „A“
Power supply 2x lead gel battery 6 V, 3,4 Ah
Battery life approx. 10 hours
Supply voltage 12 V DC, 2,5 A max.
Power-on time 10 s
Dimensions (mm) 380 x 334 x 188
Weight 5 kg
Power supply
Supply voltage Input 100…240 V AC, 50…60 Hz
Output 12 V DC, 2.5 A
Other data see the operating instructions
to article 11262-99
7.3 Ambient conditions
Area of use Indoor
Operating temperature 5 °C…40 °C
Humidity max. 80 % rel. hum. up to 31 °C,
linearly decreasing 50 % rel.
hum. at 40 °C
Operating altitude 2000 m msl max.
8 SCOPE OF SUPPLY
The ADM 3 is supplied with the following components:
 PHYWE Demo multimeter ADM 3
 Power supply 12 VDC/2.5 A 11262-99
Only use original PHYWE spare parts. For replacement,
turn to PHYWE or an authorized dealer:
 Cover ADM 3 SP-1384000
 Overload fuse (1 piece)
FF 10 A, 500 V SP-1384001
9 ACCESSORIES
The following accessories are available:
Measuring leads
 Connecting cord, 30 kV, 1000 mm 07367-00
 Safety connecting cables, e.g. 07337-88
Temperature probes NiCr-Ni, type K
 Thermocouple −50…1100 °C 13615-01
 Thermocouple −50…500 °C 13615-02
 Immersion probe, steel −50…400 °C 13615-03
 Surface probe −50…300 °C 13615-04
 Immersion probe, Teflon 0…300 °C 13615-05
For measurement and display of Cobra4 sensor values
 Cobra4 Mobile-Link 2 12620-10
 Cobra4 Display-Connect TV, transmitter 12623-00
 Cobra4 Display-Connect RX, receiver 12623-01

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10 REPLACING THE OVERLOAD SAFETY DEVICE
Ensure that the instrument is switched off and that no
measuring leads are connected.
Prior to replacing the fuse, ensure that the cause for the
blown fuse is eliminated. Never bypass or repair fuses.
Open the cover of the fuse holder (15) by turning it anti-
clockwise with a screwdriver.
Then, the overload safety device can be replaced and the
cover can be closed.
Fuse type: Type G, 10.3 mm x 38 mm
FF 10 A, 500 V, breaking capacity: >10 kA
Application category: gR
Do not use the instrument unless the fuse holder is
closed!
Should this fuse blow when the instrument is switched on,
never replace it with a more resistant fuse! A defect is indi-
cated and the instrument must be returned to the PHYWE
service department for repair.
11 WARRANTY
We give a warranty of 24 months for units that we have sup-
plied inside the EU, and a warranty of 12 months outside the
EU. The following is excluded from the warranty: damage
that is due to non-compliance with the operating instructions,
improper use or natural wear.
The manufacturer can only be held liable for the function and
safety-relevant properties of the unit if the maintenance, ser-
vice and modifications of the unit are performed by the manu-
facturer or by an institution that is expressly authorised by the
manufacturer.
12 DISPOSAL
The packaging mainly consists of environmentally-friendly
materials that should be returned to the local recycling sta-
tions.
PHYWE Systeme GmbH & Co. KG
Customer Service
Robert-Bosch-Breite 10
37079 Göttingen
Germany
Telephone [phone]
Fax [phone]
13 CLEANING
Only use a soft, dry cloth for cleaning the instrument. The in-
gress of moisture into the openings of the instrument must be
absolutely prevented.
14 EXPLANATION OF THE SYMBOLS
A
ttention!
Potentially harmful situation
(property damage)
General hazard area
Compliance with the operating instruc-
tions is required
Important information about the device
Compliance with the operating instruc-
tions is required
Direct current and alternating current
Continuous double insulation
TRMS True root mean square
CAT II Measuring category II
(see chapter 2)
Do not dispose of this product with normal
household waste. If this unit needs to be
disposed of, please return it to the address
that is stated below for proper disposal.
Attention!
AttentiAtten
tion!