Gossen Metrawatt METRAHIT 2 User guide
Operating Instructions
METRAHIT2+
Universal TRMS Multimeter
3-349-476-02
5/10.09
Symbols used in the Digital Display
1
2
3
4
5
6
7
Max.
600 V !
11
5
4
2
9
10
7
1213
16
15
18
61 3
8
14
17
1 MAN: manual measuring range selection is active
2 MIN/MAX value storage
3 HOLD: display memory, “freeze” measured value
4 Digital display with decimal point and polarity display
5 Diode measurement selected
6 appears when acoustic signal is active
7 Selected type of current
8 Unit of measure
9 Unit of measure C / F for temperature measurement
10 Triangle appears: indicates overranging
11 Pointer for analog display
1 Display (LCD)
2 ON / OFF
3 HOLD / MIN/MAX Key for the following functions: save
4 MAN / AUTO Key for manual measuring range selection
5 FUNC Key for selecting ranges or functions
6 rotary selector switch for measuring functions
7 Connector jacks
Light
Key for ON / OFF and display illumination
ON / OFF
measured value, delete and MIN-MAX
2 GMC-I Messtechnik GmbH
12 REL: relative measurement with reference to offset
13 Scale for analog display
14 Indicates that the negative analog display range has been exceeded
15 Warning regarding dangerous voltage: > 40 V AC / 60 DC
16 Display in case of defective fuse
17 Low battery display
18 Symbol for continuous duty
Standard Equipment
1 TRMS digital multimeter
1 Protective rubber holster
2 1.5 V AA size batteries
1 Set of measurement cables KS17-2
1 DKD calibration certificate
1 Short-form operating instructions
Table of Contents
Page
1 Safety Features and Precautions ...............................3
2 Initial Start-Up ............................................................5
3 Selecting Measuring Functions and
Measuring Ranges ..................................................... 5
3.1 Automatic Measuring Range Selection .....................................5
3.2 Manual Measuring Range Selection .........................................5
3.3 Quick Measurements .............................................................. 5
3.4 Relative Measurement D REL ................................................... 6
4 LCD .............................................................................6
4.1 Digital Display ......................................................................... 6
4.2 Analog Display ........................................................................ 6
4.3 Display Illumination ................................................................. 6
5 Measured Value Memory “HOLD” ..............................6
6 Saving Minimum or Maximum Values
“MIN/MAX” Hold .........................................................6
7 Voltage Measurement ................................................7
7.1 Transient Overvoltages ............................................................ 7
7.2 Voltage Measurements at Above 600 V .................................... 8
7.3 Sub-function Hz ...................................................................... 8
8 Current Measurement ................................................8
8.1 Measuring Alternating Current with (Clip-On)
Current Transformers ............................................................ 10
8.1.1 Transformer Output mA / A ...................................................10
8.1.2 Transformer Output V ............................................................ 10
9 Resistance Measurement .........................................10
10 Continuity and Diode Testing ...................................11
11 Temperature Measurement ......................................12
12 Characteristic Values ...............................................13
13 Maintenance ............................................................16
13.1 Battery ................................................................................. 16
13.2 Fuses ................................................................................... 16
13.3 Housing ................................................................................ 16
14 Repair and Replacement Parts Service,DKD
Calibration Center* and Rental Instrument Service ..17
15 Guarantee .................................................................17
16 Product Support .......................................................17
17 Recalibration Service ...............................................17
1 Safety Features and Precautions
You have selected an instrument which provides you with a
high level of safety.
This instrument fulfills the requirements of the applicable
European and national EC guidelines. We confirm this with
the CE marking. The relevant declaration of conformity can
be obtained from GMC-I Messtechnik GmbH.
The analog-digital multimeter is manufactured and tested in
accordance with safety regulations IEC 61010–1:2001/
DIN EN 61010–1:2001/VDE 0411–1:2002. When used for its
intended purpose, safety of the operator, as well as that of
the instrument, is assured. Their safety is however not
guaranteed, if the instrument is used improperly or handled
carelessly.
In order to maintain flawless technical safety conditions, and to
assure safe use, it is imperative that you read the operating
instructions thoroughly and carefully before placing your instrument
into service, and that you follow all instructions contained therein.
In the interest of your own safety and in order to protect the
instrument, the multimeter is equipped with an automatic
socket blocking mechanism. This mechanism is linked to the
function selector switch and only allows access to those
jacks which are actually required for the selected function. It
also prevents the user from turning the selector switch to
impermissible functions after the measurement cables have
already been plugged in.
Observe the following safety precautions:
• The instrument may only be operated by persons who
are capable of recognizing contact hazards and taking
the appropriate safety precautions. Contact hazards exist
anywhere, where voltages of greater than 33 V
occur.
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person
is present.
• Maximum allowable voltage between any of the connector
jacks and earth is 600 V, category III. Nominal voltage at
the system may not exceed 600 V. Voltage measurement
may only be performed with the selector switch set to the
V= or the V~ position.
• Be prepared for the occurrence of unexpected voltages
at devices under test (e.g. defective devices). For
example, capacitors may be dangerously charged.
• Make certain that the measurement cables are in flawless
condition, e.g. no damage to insulation, no interruptions
in cables or plugs etc.
• No measurements may be made with this instrument in
electrical circuits with corona discharge (high-voltage).
• Special care is required when measurements are made in
HF electrical circuits. Dangerous pulsating voltages may
be present.
RMS
may
GMC-I Messtechnik GmbH 3
• Measurements under moist ambient conditions are not
Warning!
!
Consecutive number
Registration number
Date of calibration (year – month)
German Calibration Service– calibration laboratory
B0730
01-04
DKD-K19701
permitted.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit values
can be found in the “Measuring Ranges” table in chapter
12 “Characteristic Values”.
• All current measuring ranges are protected with fuses.
Maximum allowable voltage for the measuring current
circuit is 600 V in all “mA” and “A” ranges.
• We recommend using our KS30 measuring adapter,
available as an accessory, for hazard-free voltage
measurement in power installations with up to 1000 V. The
included internal resistor limits measuring current in the
event of excessive voltage and operator error, and
assures reliable quenching of active spark gaps. For
additional information refer to chapter 7.2 “Voltage
Measurements at Above 600 V”.
The instrument may not be operated in explosive
atmospheres, or connected to intrinsically safe
electrical circuits.
Meanings of symbols on the instrument:
Warning concerning a source of danger
(attention: observe documentation)
Earth terminal
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts
may be exposed. The instrument must be disconnected from
the measuring circuit before the performance of repairs, the
replacement of parts or balancing. If balancing, maintenance
or repair of a live open instrument is required, this may only
be carried out by trained personnel who are familiar with the
dangers involved.
Defects and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and
secured against unintentional use.
Safe operation can no longer be relied upon:
• If the device demonstrates visible damage
• If the instrument no longer functions
• After lengthy periods of storage under unfavorable
conditions (e.g. humidity, dust, temperature), see
ambient conditions on page 15
Continuous, doubled or reinforced
insulation
This device may not be disposed of with the
trash. Further information regarding the WEEE
mark can be accessed on the Internet at
www.gossenmetrawatt.com by entering the
search term ’WEEE’.
Indicates EC conformity
CAT III
Maximum allowable voltage
between the
connector jacks and earth is
600 V, category II I
.
DKD Calibration Upon Request
4 GMC-I Messtechnik GmbH
2 Initial Start-Up
Note!
Battery
Your instrument is supplied with two 1,5 V AA size batteries in
accordance with IEC LR 6, and is ready for operation. Be sure
to refer to chapter 13.1 “Battery”, before initial start-up, or after
your device has been in storage for a lengthy period of time.
Switching the Instrument On
➭ Press the ON / OFF key.
Power-up is acknowledged with an acoustic signal. All of
the segments at the liquid crystal display (LCD) are
illuminated shortly. The LCD is shown in the diagram on
page 2.
Electrical discharge and high frequency interference
may cause incorrect displays to appear, and may
disable the measuring sequence. In such cases,
switch the instrument off and back on again in order
to reset. If the problem persists, briefly dislodge the
battery from the connector contacts.
Disconnect the instrument from the measuring circuit before
opening and refer to chapter 13 “Maintenance”!
Automatic Shutdown
The instrument switches itself off automatically if neither one
of the keys nor the rotary selector switch are activated for a
period of approximately 10 minutes.
Disabling Automatic Shutdown
The instrument can be set to continuous duty. Press the
FUNC key and the ON / OFF key simultaneously when
switching the instrument on to this end. Continuous duty is
indicated at the LCD by means of the symbol.
Switching the Instrument Off
Press the ON / OFF key.
3 Selecting Measuring Functions and Measuring Ranges
The function selector switch is linked to the automatic socket
blocking mechanism, which only allows access to two
connector jacks for each function. Be certain to remove the
appropriate plug from its respective jack before switching to
and from the “mA” or the “A” function. The socket blocking
mechanism prevents the user from inadvertently turning the
selector switch to impermissible functions after the
measurement cables have been plugged in to the instrument.
3.1 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring range
selection for all ranges except the 600 mV range. Autoranging is active as soon as the instrument is switched on.
The instrument automatically selects the measuring range
which allows for highest possible resolution of the applied
quantity.
The instrument is automatically switched to:
– The next highest range at typically (6039 digits + 1 digit)
– The next lowest range at typically (560 digits – 1 digit)
3.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can
be selected manually in accordance with the following table.
Manual operation is deactivated by pressing and holding the
MAN / AUTO key (approx. 1 s), by activating the
rotary selector switch, or by switching the instrument off and
then back on again.
If the instrument is switched back to auto-ranging in the
600 mV range, the respective range or 6 V is selected
automatically.
AUTO/
MAN
(4)
brief
V : 600 mV 6V 60 V 600 V 600 mV ...
V: 6V 60 V 600 V 600 mV 6V ...
mA : 60 mA 600 mA ...
brief
mA : 60 mA 600 mA ...
A : 6A 10A 6A ...
A : 6A 10A
:60M 600 6k 60 k
600k6M 60 M...
long Return to automatic range selection — 2 x
Function
Manual mode active:
utilized measuring range is fixed
Range switching sequence for:
Acknowledge-
ment
Acou-
Dis-
stic
play
Signal
MAN
1 x
(10)
MAN
1 x
(10)
3.3 Quick Measurements
Measurements performed using a suitable fixed measuring
range are executed more quickly than those which utilize
automatic range selection. Quick measurement is made
possible with the following two functions:
• Manual measuring range selection, i.e. selection of the
measuring range with best resolution (see chapter 3.2)
or
•With the HOLD function (see chapter 5). In this way, the
correct measuring range is selected automatically after
the first measurement and all further measurements are
executed more quickly.
The selected measuring range remains active for the
subsequent series of measurements with these two
functions.
GMC-I Messtechnik GmbH 5
3.4 Relative Measurement REL
Note!
MAX MIN
MAN / AUTO *
HOLDHOLD x 2
HOLD long
A reference value for relative measurements can be stored to
memory with the keys MAN / AUTO and HOLD.
The applicable reference or correction value is substracted
individually for the respective measuring function as an offset
from all subsequent measurements, and remains in memory
until deleted, or until the multimeter is switched off.
Reference value setting is only possible for the respective
manually selected measuring range.
Setting the Reference Value
➭ Plug the measuring cable into the instrument and
measure a reference value
➭ Press the MAN / AUTO key and the HOLD key
simultaneously.
The instrument acknowledges storage of the reference
value with an acoustic signal, and the REL symbol
appears at the LCD. The value measured at the
moment the keys are pressed serves as a reference
value.
➭ The reference value can be cleared by once again
pressing the MAN / AUTO and HOLD keys.
Relative measurement effects the digital display only.
Relative measurement is not active during overflow.
In the case of relative measurement, quantities may
also appear as negative values.
4LCD
4.1 Digital Display
The measured value with decimal and plus or minus sign
appears at the digital display. The selected unit of measure
and the current type are displayed as well. A minus sign
appears to the left of the value during the measurement of
zero-frequency quantities, if the plus pole of the measured
quantity is applied to the “” input. “OL” is displayed if the
upper range limit of 6039 is exceeded (or 1999 in the
range).
The digital display is refreshed twice per second during V, A
and measurements.
4.2 Analog Display
The analog display with simulated pointer and the same
dynamic performance as a moving-coil mechanism is
refreshed 20 times per second during V, A and
measurements. This display is especially advantageous for
observing measured value fluctuation, and for balancing
procedures.
The analog display has its own polarity indicator. If the
measured value exceeds the display range, polarity at the
analog display is switched after approximately 0.7 seconds.
Overranging is indicated by the triangle at the right (> 6039
digits).
6 GMC-I Messtechnik GmbH
4.3 Display Illumination
After the instrument has been switched on, background
illumination can be activated by briefly pressing the
ON / OFF LIGHT key. Illumination is switched back off by once
again pressing the same key, or automatically after
approximately 1 minute.
5 Measured Value Memory “HOLD”
By pressing the HOLD key, the currently displayed
measurement value can be “frozen” in the display, and “Hold”
is simultaneously indicated. Automatic shutdown is
deactivated during this process.
The Hold display is deactivated if:
•the HOLD key is pressed and held
•the rotary selector switch is activated
•the FUNC multifunction key is pressed for a change of
function, e.g. AC
Hz.
6 Saving Minimum or Maximum Values
“MIN/MAX” Hold
Minimum and maximum measured values applied to the
measuring instrument’s input after the MAX/MIN function has
been activated, can be “frozen” at the display with the MAX/
MIN function. The most important use of this function is the
determination of minimum or maximum values during longterm measured quantity observation.
➭ Select the measurement function with the
rotary selector switch and, if appropriate, with the FUNC
multifunction key.
➭ Connect the device under test as described in the
following measurement instructions.
➭ Press the HOLD key twice.
MAX is displayed. The measuring instrument continually
updates and digitally displays the largest occurring
measured value.
➭ Press the HOLD key.
MIN is displayed. The measuring instrument continually
updates and digitally displays the lowest occurring
measured value. Pressing HOLD once more switches this
function back to MAX.
➭ Press and hold the HOLD key for approx. 2 seconds, to
quit the HOLD function.
* range selection is not provided for with MAN + MIN / MAX
Loading...