Gossen MetraWatt METRAport 40S User manual

METRAport40S
Digital Multimeter
3-349-412-02
6/10.14
Operating Instructions

2 GMC-I Messtechnik GmbH
Control Elements
1LCD
2 Battery compartment cover
3 mA, A connector jack for direct measurement of current to “max. 10 A”
4 A connector jack for current clamp measurement to “max. 30 V”
5 Connector jack for all measuring ranges except current measuring ranges
6“”connector jack for all measuring ranges
7OFF/ON: ON/OFF switch
8 Resettable miniature circuit breaker (AUTO FUSE)
9 Rotary switch for function selection
10 Eyelet for carrying strap
11 MAN/AUTO : Key for manual and automatic measuring range selection
12 DATA and MIN/MAX: Key for measured value storage
13 FUNC: Multifunction key
1
2
7
9
10
12
13
11
8
3
4
5
6
3
4
5
6

GMC-I Messtechnik GmbH 3
Digital Display Symbols
1 Continuous operation
2 Battery voltage display
3 Digital display with indication of decimal place and polarity
4 Manual measuring range selection
5 Display memory, “freeze measured value”
6 MIN-MAX storage
7 ZERO: zero balancing active
8 Selected current type, DC ()or DCAC ( )
9 USB Interface display
(when communication is active is displayed)
10 Unit of measure
11 Over-ranging
12 RPM measurement: Upm1/Upm2 (at 2/4 stroke engines)
13 Pointer for analog display
14 Analog display scale
15 Resistance thermometer: Pt100 / Pt1000
16 Thermocouple: type K
17 Current clamp measurement active
18 Negative analog display range exceeded
19 Transformer ratio (clip factor)
20 Acoustic signal activated (e.g. for continuity testing)
21 Diode measurement
134 8
10
11131418
19
5 6
2
15
7
16
17
21
20
12
9

4 GMC-I Messtechnik GmbH
Contents......................................................................................................................... Page
1 Safety Features and Precautions ............................................................................5
2 Initial Start-Up .........................................................................................................7
3 Selecting Measuring Functions and Measuring Ranges .........................................8
3.1 Automatic Measuring Range Selection ........................................................................8
3.2 Manual Measuring Range Selection – MAN/AUTO Key .................................................8
3.3 Quick Measurements .................................................................................................9
4 Display (LCD) ...........................................................................................................9
4.1 Display Illumination ....................................................................................................9
4.2 Digital Display ...........................................................................................................9
4.3 Analog Display ..........................................................................................................9
5 Measured Value Storage – DATA / MIN-MAX Key .................................................10
5.1 DATA (hold / compare) .............................................................................................10
5.2 Storage of Minimum and Maximum Values “MIN/MAX” with Time Stamp ....................11
6 Voltage and Frequency Measurement ...................................................................12
6.1 Transient Overvoltages .............................................................................................13
6.2 Measuring Voltages of Greater than 300 V ................................................................13
6.3 Low-Voltage Measurement .......................................................................................13
7 Current Measurement ...........................................................................................13
7.1
Current Measurement with Current (Clamp) Sensors with Voltage Output ........................... 15
7.2 RPM Measurement at combustion engines ................................................................15
8 Resistance Measurement ......................................................................................16
9 Continuity Testing .................................................................................................16
10 Diode Testing ........................................................................................................17
11 Capacitance Measurment .....................................................................................18
12 Frequency Measurement – Duty Cycle Measurement ..........................................18
13 Temperature Measurement with Pt100 and Pt1000 .............................................19
14 Temperature Measurement with Type K Thermocouple .......................................19
15 Characteristic Values .........................................................................................20
16 Maintenance .........................................................................................................26
16.1 Batteries .................................................................................................................26
16.2 Fuses ......................................................................................................................26
16.3 Housing / Opening of Equipment / Repair ..................................................................27
16.4 Device Return and Environmentally Compatible Disposal ............................................27
17 Multimeter Messages ...........................................................................................27
18 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ................................................28
19 Product Support ....................................................................................................28

GMC-I Messtechnik GmbH 5
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 has been manufactured and tested in accordance
with safety regulations IEC 61010–1:2010/DIN EN 61010–1:2010/VDE 0411–
1:2011. If used for its intended purpose, safety of the operator, as well as that of
the instrument, is assured. However, safety cannot be guaranteed if the instru-
ment is used improperly or handled carelessly.
In order to maintain flawless technical safety condition, 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.
For your safety, as well as for protection of your multimeter, the instrument is
equipped with a miniature circuit breaker for the 10 A current measuring range.
Observe the following safety precautions
• The instrument may only be operated by persons who are capable of recog-
nizing contact hazards and implementing appropriate safety precautions.
Contact hazards exist anywhere, where voltages of greater than 33 V RMS
may occur.
• Avoid working alone when taking measurements which involve contact
hazards. Be certain that a second person is present.
• Maximum allowable voltage between terminals (3), (4), (5), (6) and ground is equal to
300 V, category II.
• The current measuring range A is equipped with a magnetic circuit breaker.
Max. allowable voltage at the meas. circuit (= miniature circuit breaker nominal
voltage) is equal to 240 V~ (AC) and 50 V (DC) against earth in the “mA”
and “A” ranges.
• The instrument may only be used for current measurement in power systems if the
electrical circuit is protected with a fuse or a circuit breaker with a rating of up to
20 A, and if nom. voltage at the system does not exceed 240 V~ (AC) or 50 V (DC).
In order to conform to the CAT requirements, an additional slow-blowing fuse link
(T16A/500V) has been fitted in series with the miniature circuit breaker which can
only be replaced by service personnel once it is tripped.
• Be prepared for the occurrence of unexpected voltages at devices under test
(e.g. defective devices). For ex., 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.
• Measurements under moist ambient conditions are not permitted.

6 GMC-I Messtechnik GmbH
• 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 15, “Characteristic Values”.
Meaning of symbols on the instrument
Warning concerning a point of danger
(Attention: observe documentation!)
Earth
Continuous doubled or reinforced insulation
CAT II Measurement category II device
Indicates CE conformity
The 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.
Calibration mark (blue seal):
Repairs, 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 repair,
replacement of parts or balancing. If repair or balancing 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 instrument demonstrates visible damage
• If the instrument no longer functions
• After long periods of storage under unfavorable conditions, e.g. humidity,
dust, excessive temperature (see “Ambient Conditions” on page 25).
!
Serial number
Registration number
Date of calibraion (year – month)
German Accrediation Body GmbH – Calibration lab
XY123
2012-08
D-K-
15080-01-01

GMC-I Messtechnik GmbH 7
2 Initial Start-Up
Installing Batteries
Attention!
!
Disconnect the instrument from the measuring circuit at all poles before
opening the battery compartment!
➭Fold the instrument closed.
➭Insert a coin or a similar object into the slot between the housing and the
battery compartment cover and press down until the battery compartment
cover snaps open.
➭Fold the instrument open as far as it will go and remove the battery
compartment cover.
➭Insert two 1.5 V mignon batteries per IEC R6 or IEC LR6 into the battery
compartment, making sure they are poled in accordance with the symbols.
➭Replace the battery compartment cover and press into position until it
audibly snaps into place.
Switching the Instrument On
➭Set the toggle switch to the “ON” position.
Activation of the instrument is acknowledged with an acoustic signal.
If the instrument has been shut down automatically, press either the FUNC, DATA or
MAN key to switch the multimeter back on, or set the toggle switch to the “OFF”
position and leave it there for at least 5 s before returning it to the “ON” position.
Note!
Electrical discharges and high frequency interference may lead to erro-
neous display values, and may disable the measuring sequence. Reset
the instrument by switching it off and then, after 5 s, back on again.
Switching the Instrument Off Manually
➭ Set the toggle switch to the “OFF” position and fold the instrument closed. The
battery is automatically disconnected when the multimeter is folded closed.
Automatic Shutdown (standby)
The instrument switches itself off automatically if the measured value remains
constant for a long period of time (maximum measured value fluctuation approx.
0.8% of the measuring range per minute, or 1 Celsius or 1 Fahrenheit per min-
ute), and if no keys are activated for a period of approximately 10 minutes. Shut-
down is acknowledged by a brief acoustic signal. Exception: continuous opera-
tion mode.
Note!
Electrical power is supplied to the processor even after the instrument
has been switched off automatically. A closed-circuit current of about
200 A remains. The instrument is only disconnected from the batteries
after it has been switched off manually with the toggle switch or with the
instrument folded.

8 GMC-I Messtechnik GmbH
Disabling Automatic Shutdown
The instrument can be switched to “CONTINUOUS ON”.
➭Press the FUNC key while switching the instrument on with the toggle switch
until an acoustic signal is generated. The “CONTINUOUS ON” function
is indicated at the display with the symbol.
3 Selecting Measuring Functions and Measuring Ranges
3.1 Automatic Measuring Range Selection
The multimeter is equipped with auto-ranging for all measuring ranges except for
temperature measurement, diode and continuity testing. Auto-ranging is always
activated as soon as the instrument is switched on. Depending upon the mea-
sured quantity, the device automatically selects the measuring range which
allows for best possible resolution.
The instrument automatically switches to the next highest or next lowest
measuring range for the following measured quantities:
3.2 Manual Measuring Range Selection – MAN/AUTO Key
Auto-ranging can be deactivated and ranges can be set manually in accordance
with the following table.
The manual mode is deactivated by pressing and holding the MAN/AUTO key for
about 1 s, by turning the rotary switch or by switching the instrument off and
back on again.
Measuring Ranges Resolution
Switching to the next
highest range occurs
at(... d + 1 d)
Switching to the next
lowest range occurs 1)
at (... d –1 d)
V , V , A , mA ,
A,, 30 mF, Hz, 4 ¾ 31 000 2 800
30 nF 300 F 3 ¾ 3 100 280
Key
MAN/AUTO Function Acknowledgement
Visual Acoustic
brief Manual mode active: utilized measuring range is fixed MAN 1 x
brief
Switching sequence for:
V: 300 mV 3V30 V 300 V 600 V 300 mV 
A: 300 A3mA30 mA 300 mA 3A10 A 
300 A
:30M30  300 3k30 k300k
3M30 M
F: 30 nF 300 nF 3 F30 F300 F30 nF 
Hz: 300 Hz  3kHz  30 kHz  300 kHz  1MHz  300 Hz 
: 3.0000 30.000 300.00 3.0000 
MAN 1 x
long Return to automatic measuring range selection — 2 x

GMC-I Messtechnik GmbH 9
3.3 Quick Measurements
If you wish to perform quicker measurements than those possible with the auto-
matic measuring range selection function, make sure to establish the appropriate
measuring range:
•bymanual measuring range selection, i. e. by selecting the measuring range
with the best resolution, see chapter 3.2.
or
•viaDATA function, see chapter 5. After the first measurement, the proper
measuring range will be automatically determined so that measurements are
performed more rapidly from the second measured value onwards.
With both functions, the established measuring range is maintained for the sub-
sequent series mode measurments.
4Display(LCD)
4.1 Display Illumination
After the instrument has been switched on, background illumination can be acti-
vated by briefly pressing the DATA/MIN/MAX and MAN/AUTO keys simultane-
ously. Illumination is switched back off by once again pressing the same keys, or
automatically after approximately 1 minute.
4.2 Digital Display
The measured value appears at the digital display with decimal point and sign (+
or -). The selected unit of measure and the type of current are displayed as well.
A minus sign is displayed to the left of the value for the measurement of zero-
frequency quantities if the positive pole of the measured quantity is applied to the
jack.
If the measuring range upper limit is exceeded for the following measured
quantities, “OL” (overload) is displayed:
V (DC), I (DC), Hz, V~ (AC), I~ (AC), 30 mF: 30999 digits
30 nF 300 F: 3099 digits
The digital display is refreshed at different rates for the individual measured
quantities (see “Display Refresh Rates” on page 24.
4.3 Analog Display
The analog display with simulated pointer and dynamic response equivalent to
that of a moving-coil mechanism, is refreshed 20 times per second. This display
is especially advantageous for the observation of measured value fluctuations,
and during balancing.
The analog display is equipped with a polarity indicator. The scale is extended 5
segments into the negative range for the measurement of zero-frequency
quantities, allowing for precise observation of measured value fluctuation around
the zero point. If the measured value exceeds the display range, a triangle is first
display at the left, and polarity at the display is reversed approximately 0.7
seconds later. If the measuring range is exceeded (> 30999 digits, in the F range
(except 30 mF) : > 3099) a triangle is displayed at the right.
Scaling at the analog display is automatic, which is quite helpful for manual
measuring range selection.

10 GMC-I Messtechnik GmbH
5 Measured Value Storage – DATA / MIN-MAX Key
5.1 DATA (hold / compare)
Measured values can be automatically frozen at the display with the DATA (hold)
function. This is especially useful when full attention is required for contacting the
measuring point. After the measured value has been applied to the multimeter
and the “condition” indicated in the following table has been fulfilled, the mea-
sured value is frozen at the digital display and an acoustic signal is generated.
The test probes can then be removed from the measuring point, and the mea-
sured value can be read from the digital display. If the measured value is less
than the limit value shown in the table, the instrument is reactivated for a new
measurement with the DATA hold function.
If the new measured value deviates from the previous value by less than 100 dig-
its, the acoustic signal sounds twice (DATA compare).
1) Reactivation occurs if the indicated measured value limits are fallen short of.
2) Double acoustic signal after the first measured value has been stored.
Thereafter, double acoustic signal only occurs if the currently frozen value deviates from the
first stored value by less than 100 digits.
3) Exception: 10% at 300 
Key: MR = measuring range
The DATA function has no effect on the analog display, which continues to
indicate the current measured value. However, it must be observed that the
decimal place is fixed when the digital display is “frozen”.
The DATA function can be deactivated by pressing and holding the DATA key for
about 1 second, by turning the function selector switch or by switching the
instrument off and back on again.
Function
DATA
Key
DATA
Condition Reaction at Instrument
Measuring
Ranges
Measured Value
Limits
(digits)
Display Acoustic
Signal
Measured
Value, Digital DATA
Activate brief blinks 1 x
Hold V, A, F, Hz, %
, ,
> 3.3% of MR
OL3)
> 3.3% 3)
of range
is
displayed
is
displayed
1 x
2 x 2)
Reactivate 1) V, A, F, Hz, %
, ,
< 3.3% of MR
OL3)
< 3.3% 3)
of MR
frozen
measured
value
blinks
Deactivate long is
cleared
is
cleared 2 x

GMC-I Messtechnik GmbH 11
5.2 Storage of Minimum and Maximum Values “MIN/MAX” with Time Stamp
Minimum and maximum measured values which occur at the input of the mea-
suring instrument after the MIN/MAX function has been activated can be saved
to memory. The most important application for this function is the determination
of minimum and maximum values during long-term observation of measured
quantities (same function as the slave pointer at an analog display).
The “MIN/MAX” function can be activated for all measuring ranges.
The MIN/MAX function has no effect on the analog display, which continues to
indicate the current measured value.
Apply the measured quantity to the instrument and select the measuring range
before activating the MIN/MAX function.
Measuring ranges can only be selected manually after the function has been
activated, and stored MIN/MAX values and time stamps are deleted in doing so.
The MIN/MAX function is deactivated by pressing and holding the DATA key for
about 1 second, by turning the function selector switch or by switching the
instrument off and back on again.
Function
MIN-MAX
Key
DATA
MIN and MAX
Measured Values /
Time Stamps
Reaction at Instrument
Display Acoustic
Signal
Measured Value,
Digital MIN MAX
1.
Activate and
Save
2 x brief are saved current measured
value
MIN and MAX
blink 2 x
2.
Save and
Display
brief
Storage continues
in background,
new MIN and MAX
values and time
stamps are displayed
stored MIN value MIN 1 x
brief time elapsed to
stored MIN value
MIN and h:mm:ss 1 x
brief MIN and hh:mm 1 x
brief stored MAX value MAX 1 x
brief time elapsed to
stored MAX value
MAX and h:mm:ss 1 x
brief MAX and hh:mm 1 x
3.
Return to 1. brief
same as 1.,
stored values are not
deleted
same as 1. same as 1. 1 x
Deactivate long are deleted is deleted is cleared 2 x

12 GMC-I Messtechnik GmbH
6 Voltage and Frequency Measurement
➭Set the rotary switch to either V (TRMS) or V , depending upon the
voltage to be measured.
➭You can switch back and forth between voltage and frequency
measurement in the V switch position by pressing the FUNC key.
➭Connect the measurement cables as shown. The jack must be grounded.
Note!
An intermittent acoustic signal warns the operator if the measured value
exceeds the measuring range upper limit in the 600 V range.
Attention!
!
Make certain that neither of the current measuring range is selected
(“A”) and that the measuring cables are connected to the right “V” und
“” jacks when the multimeter is connected for voltage measurement!
Both the operator and the instrument are in danger if the breaking
thresholds for the fuses are exceeded due to operator error!
Zero Balancing in the
300 mV Measuring Range
➭Select the 300 mV
measuring range.
➭Connect the measure-
ment cables to the instru-
ment and connect the
free ends to one another.
➭Briefly press the FUNC key.
The instrument acknowledges
zero balancing with an
acoustic signal, and “000.00”
(1 digit) and the ZERO
symbol appear at the LCD.
The voltage displayed at the moment the key was pressed is used as a reference
value (max. 2000 digits which
corresponds to 20 mV).
This value is automatically subtracted from all subsequently measured values.
➭Zero balancing can be cleared:
– by pressing and holding the FUNC key,
after which clearing is acknowledged by
– a twice repeated acoustic signal,
by switching the instrument off.
– (+)
~+ (–) ~

GMC-I Messtechnik GmbH 13
6.1 Transient Overvoltages
The multimeter is protected against transient voltages of up to 4 kV with front
and half times of up to 1.2 and 50 s respectively. Due to the fact that powerful
overvoltages must be reckoned with during measurement, for example in power
systems, at transformers or motors, we recommend the use of our KS30 mea-
suring adapter in such cases. It offers protection against transient overvoltages
of up to 6 kV with front and half times of up to 10 and 1000 s respectively.
Continuous load capacity is equal to 1200 Veff. Additional measuring error
due to use of the KS30 measuring adapter amounts to approximately –2%.
6.2 Measuring Voltages of Greater than 300 V
Voltages of greater than 300 V can be measured with a high-voltage measuring
probe, for example the HV31) of the HV302) from GMC-I Messtechnik GmbH.
The bonding terminal must be grounded in this case. Observe all applicable
safety precautions!
1) HV3: 3 kV 2)HV30: 30 kV for (DC) voltage only
6.3 Low-Voltage Measurement
The instrument is equipped with a special 30 mV measuring range for measuring
voltage drop at fuses which is distinguished by high resolution (10 V) with a low
input resistance of 50 k.
➭Set the rotary switch to “Temp RTD”.
➭Select “V DC” measurement with probe by repeatedly pressing the FUNC
key until “mV DC” appears at the display.
➭Connect the probe to the “” and “V” sockets.
7 Current Measurement
➭First disconnect supply power from the measuring circuit or the power
consumer and discharge all capacitors, if any are present.
➭Depending upon the type of current, set the rotary switch to “A ” or “A ”.
➭
The symbol for the selected current type, (DC) or ~ (AC), appears at the LCD.
➭Connect the measuring instrument securely to the power consumer in se-
ries as shown in the diagram (without transition resistor).
black
black
red
x1000 x100
Measuring voltages of greater than 300 V
with the HV3 high-voltage probe

14 GMC-I Messtechnik GmbH
Notes Concerning Current Measurement:
• The instrument may only be
used in power installations if
the electrical circuit is pro-
tected with a fuse or a circuit
breaker with a rating of up to
20 A, and if nominal voltage at
the system does not exceed
240 V~ (AC) or 50 V (DC).
• Set up the measuring circuit
in a mechanically secure
fashion such that it cannot
be inadvertently interrupted.
Use conductors with an
adequate cross section and
connectors of adequate
size in order to prevent
excessive warming.
• In the A measuring ranges, an intermittent acoustic signal generates a warn-
ing if the measured value exceeds 10 A.
• All measuring ranges up to 10 A are protected by a resetable, 15 A/
240 V AC/50 V DC auto-fuse. In order to conform to the CAT requirements,
an additional slow-blowing fuse link (T16A/500V) has been fitted in series
with the miniature circuit breaker which can only be replaced by service per-
sonnel once it is tripped.
• If a fuse or circuit breaker in the active current measuring range is tripped,
FUSE appears at the digital display, and an acoustic signal is generated
simultaneously.
• Eliminate the cause of overload after the fuse or breaker is tripped before
placing the instrument back into service!
Attention!
!
If the secondary side of the current transformer with voltage output
remains open during operation, e.g. if cables are defective or have not
been connected, or due to a blown device fuse or incorrect
connection, dangerous voltages may occur at the terminals.
Note!
Motors with high starting current cause tripping of the circuit breaker,
except for measurement with clamp meters.
– (+)
~+ (–) ~

GMC-I Messtechnik GmbH 15
7.1 Current Measurement with Current (Clamp) Sensors with Voltage Output
If a current sensor is connected to the multimeter, all current values are displayed
correctly in consideration of the transformer ratio. This presupposes that the cur-
rent sensor is equipped with the required sensitivity, and that the
appropriate ratio is selected before measurement is performed.
➭Turn the rotary switch to the position.
➭Select a current type, A (DC) , A ( ) (AC+DC), Hz, RPM Upm1
or Upm2 (see below) , by pressing the FUNC key.
➭Simultaneously press the FUNC and the MAN/AUTO keys. The currently
selected transformation ratio is displayed. The transformer ratio can be
changed by pressing the MAN or the DATA key, or the currently selected value
can be retained by pressing the FUNC key.
➭Connect the current (clamp) sensor to the and the jacks.
Please observe the specified operating conditions per IEC/EN 61010-2-32
regarding measurement category, etc. for the applied current sensor.
Additional error caused by the current sensor must be taken into consideration.
7.2 RPM Measurement at combustion engines
RPM is measured by acquiring pulses. The number of measurable pulses per
revolution varies depending upon the type of engine (2 or 4 stroke).
➭Set the rotary switch to “ ”.
➭Press the multifunction key (
FUNC ) repeatedly until unit of measure Upm1
(RPM measurement at 2 stroke engines: 1 pulse per revolution) or Upm2 (RPM
measurement at 4 stroke engines: 1 pulse for 2 revolutions)
is briefly displayed.
The measured value then appears, for example “244.3
Upm ”.
M
I(A)
V/~
* for short-circuited measuring cables: residual value 1 ... 70 d at zero point due to TRMS converter
Current sensor
transformer ratio
max. measuring range Measuring ranges
available in the multimeter
A A~*
1/ 1 V/A
depending on the applied
current sensor
0 ... 300.00 mA/3.000 A/30.00 A
1 / 10 V / A 0 ... 3.0000 A/30.000 A/300.00 A
1 / 100 V / A 0 ... 30.000 A/300.00 A/3.0000 kA
1 / 1000 V / A 0 ... 300.00 A/3.0000 kA/30.000 kA

16 GMC-I Messtechnik GmbH
8 Resistance Measurement
➭Set the rotary switch to the 
position. Overload is indicated
if no device under test has been
connected: “0.L M”.
➭Before connecting the device under
test, make sure that it is voltage-
free. Interference voltages distort
measurement results! Perform a
voltage test first if required.
➭Connect the device under test as
shown in the diagram.
Zero Balancing in the 30 , 300 and 3 kMeasuring Ranges
Resistance at cables, as well as contact resistances, can be eliminated for the
measurement of low-resistance values in the 30 , 300 and 3 kranges by
means of zero balancing:
➭Connect the measurement cables to the instrument and connect the free
ends to one another (short circuit the test probes).
➭Briefly press the FUNC key.
The instrument acknowledges zero balancing with an acoustic signal, and
“00.00 ”, “ 000.00 ” or “0.0000 k”and the ZERO symbol appear at the
LCD.
Resistance measured at the moment the key is pressed is used as a
reference value (max. 2000 digits). This value is automatically subtracted
from all subsequently measured values.
➭Zero balancing can be cleared:
– by pressing and holding the FUNC key, after which clearing is acknowledged
by a twice repeated acoustic signal,
– by switching the instrument off.
9 Continuity Testing
With the “acoustic signal” function activated, and exclusively in the 0 to 310 
measuring range, the instrument generates a continuous acoustic tone for
measured resistance within a range of 0 to approximately 2 .
➭Turn the selector switch to the position. The and symbols appear at
the LCD.
➭Connect the measurement cables to the device under test.
Note!
Continuity testing is very fast (< 50 ms) and is suitable for locating
connections with poor contact (e.g. due to vibration) in automotive
service applications.
Rx
Voltage Drop

GMC-I Messtechnik GmbH 17
10 Diode Testing
➭Turn the selector switch to the position. Overload is indicated if no
device under test has been connected: “.0L V”.
➭Make sure that the device under test is voltage-free. Interference voltages
distort measurement results! Perform a voltage test first if required.
➭Connect the device under test as shown in the diagram.
Conducting Direction or Short-Circuiting
Conducting state voltage is displayed in volts at the measuring instrument. As
long as voltage drop does not exceed the maximum allowed display value of
5.1 V, several elements or reference diodes with minimal reference voltage can
be connected in series for testing. If “.0L” appears at the display, either the circuit
is interrupted or conducting state voltage is greater than 5.1 V.
Blocking Direction or Interruption
“.0L” is displayed at the instrument. If a value of less than 5.1 V is displayed, this
generally indicates that the diode’s blocking direction is defective.
Note!
Resistors and semiconductor paths which have been connected in
parallel to the diode distort measurement results!
Conducting
Direction Blocking
Direction
(max. 5.1 V)

18 GMC-I Messtechnik GmbH
11 Capacitance Measurment
➭Make sure that the device
under test is voltage-free.
Interference voltages distort
measurement results!
➭Turn the rotary switch to the
“F” position.
➭Connect the (discharged!)
device under test to the 
and V jacks with the
measurement cables.
Zero Balancing in the 30 nF Measuring Range
Intrinsic capacitance at the measuring instrument and cables can be eliminated
for the measurement of small capacitance values in the 30 nF range by means of
zero balancing:
➭Connect the measurement cables to the measuring instrument without a
device under test.
➭Briefly press the FUNC key.
The instrument acknowledges zero balancing with an acoustic signal and
“00.00 ” and the ZERO symbol appear at the LCD. Capacitance measured
at the moment the key is pressed is used as a reference value (max.
2000 digits). This value is automatically subtracted from all subsequently
measured values.
➭Zero balancing can be cleared:
– by pressing and holding the FUNC key, after which clearing is acknowledged
by an acoustic signal,
– by switching the instrument off.
12 Frequency Measurement – Duty Cycle Measurement
➭Turn the rotary switch to the Hz position.
➭Apply the measured quantity as described under voltage measurement.
➭Smallest measurable frequencies and maximum allowable voltages are
listed in chapter 15, “Characteristic Values”.
The pulse-period ratio can be ascertained for square-wave signals with the duty
cycle measurement.
➭Briefly press the multifunction key twice (FUNC). The instrument is switched
to duty cycle measurement. The duty cycle, i.e. the pulse duration of a sig-
nal as a percentage, is displayed at the LCD.
Note
The applied frequency must remain constant during duty cycle measurement.
+
–
Duty Cycle (%) = ——————— • 100
Pulse Duration
Period

GMC-I Messtechnik GmbH 19
13 Temperature Measurement with Pt100 and Pt1000
➭Set the rotary switch to
“Temp RTD”.
➭Connect the Pt sensor to
the and V jacks. The
instrument automatically
recognizes type of
connected sensor (Pt100
or Pt1000), and displays
measured temperature in
the selected unit of
measure.
Note!
The characteristic cable resistance for the temperature sensors which
are available as accessories is automatically taken into consideration for
this measurement.
Temperature Measurement
with Compensation for Sensor Cable Resistances from 0.1 to 50 
Sensor cable resistances with values other than100 mcan be compensated
for values of up to 50 as follows:
➭Briefly press the FUNC and the MAN/AUTO keys simultaneously. The currently
selected cable resistance is displayed. This value can be increased with the
DATA key, or reduced with the MAN/AUTO key. Each time one of these keys is
briefly activated, the value is changed by 10 digits (0.1 ). The value can be
changed by means of rapid scrolling by pressing and holding the key.
➭Switch back to temperature measurement by briefly acknowledging with the
FUNC key.
The new cable resistance value is retained, even after the instrument has been
switched off.
Note!
The default setting is Pt100 /Pt1000 with a cable resistance of 0.1 .
14 Temperature Measurement with Type K Thermocouple
➭Set the rotary switch to “Temp RTD”.
➭Select “Temp TC K” measurement with thermocouple by repeatedly press-
ing the FUNC key until C or F appears at the display.
➭
Select temperature unit of measure °C or °F by long pressing the FUNC key.
➭Connect the sensor to the “” and “V” sockets.
Z3409

20 GMC-I Messtechnik GmbH
15 Characteristic Values
1) Up to max. 5.1 V diode voltage, “OL” (overload) is displayed for higher values.
2) Smallest measurable frequency for sinusoidal measuring signal symmetric to zero point.
3) corresponds to 600 V CAT I
4) Input sensitivity, signal/sine: Hz (V): 10 to 100% MR except for mV: as of 30% MR;
H (I): 20 to 100% MR except for 3 A: as of 30% MR; Hz (clip): as of 30% MR
Key: d = digit(s), rdg. = reading, MR = measuring range, MUL = measuring range upper limit
Measuring
Function Measuring Range Resolution at MUL Input Impedance
30 000 3 000 ~
V DC 30 mV 10 V50k—
V
300 mV 10 V > 11 M11 M//<50pF
3 V 100 V11M11 M//<50pF
30 V 1 mV 10 M10 M//<50pF
300 V 10 mV 10 M10 M//<50pF
600 V 3) 100 mV 10 M10 M//<50pF
Approximate Voltage Drop at MUL
A
300 A 10 nA 160 mV
3 mA 100 nA 160 mV
30 mA 1 A 180 mV
300 mA 10 A 250 mV
3 A 100 A 360 mV
10 A 1 mA 920 mV
Open-Circuit Voltage Meas. Cur. at MUL

30 10 m1.3 V max. 250 A
300 10 m1.3 V max. 250 A
3k100 m1.3 V max. 150 A
30 k11.3 V max. 30 A
300 k10 1.3 V max. 3 A
3M100 1.3 V max. 0.36 A
30 M1k1.3 V max. 0.1 A
300 0.1 max. 8.4 V Ik= 1 mA
5.1 V 1) 1 mV max. 8.4 V Ik= 1 mA
Discharge Resistance U0 max
F
30 nF 10 pF 10 M0.7 V
300 nF 100 pF 1 M0.7 V
3F 1 nF 100 k0.7 V
30 F10nF11k0.7 V
300 F 100 nF 3 k0.7 V
fmin 2) Power Limit
Hz 4)
300.00 Hz 0.01 Hz 1 Hz
3 x 106V x Hz
3.0000 kHz 0.1 Hz 1 Hz
30.000 kHz 1 Hz 1 Hz
300..00 kHz 10 Hz 1 Hz
1.0000 MHz 100 Hz 1 Hz
%
15...300 Hz: 2.0... 98.0% 0.1 Hz 0.1 Hz 1 Hz
3 x 106V x Hz... 3 kHz: 5.0... 95.0% 0.1 Hz 0.1 Hz 1 Hz
... 10 kHz: 10.0... 90.0% 0.1 Hz 0.1 Hz 1 Hz
C/F
– 200.0 ... +850.0 C Pt100
0.1 C– 150.0 ... +850.0 C Pt1000
– 250.0 ... +1372.0 CK/NiCr-Ni