Gossen MetraWatt METRAHIT 30M Operating Instructions Manual
METRAHIT⏐30M
Precision Digital Multimeter
3-348-978-02
9/3.15
Operating Instructions
2 GMC-I Messtechnik GmbH
1 LCD display, see page 3 for description
2 MENU/ON| OFF key
Menu Operating Mode: Entry acknowledgment (ENTER or ↵)
3 AVE/MIN|MAX key for storage of MIN or MAX values, as well
as for displaying time since beginning of recording
Menu Operating Mode: selection of individual parameters,
reverse flux direction,
increase values
4 MAN|AUTO key for manual measuring range selection
Menu Operating Mode: selection of individual parameters,
forward flux direction,
reduce values
5 ESC| FUNC multifunction key
Menu Operating Mode: Exit menu level and
return to next highest level,
exit parameter entry mode
without storage of values
6 Rotary switch for measurement functions
7 Connector jacks
8 Power pack connection jack NA HIT 2X
1
2
3
4
5
6
7
7
8
GMC-I Messtechnik GmbH 3
GB
Digital Display Symbols
1 Digital display with decimal place and polarity
2 Continuous operation
3 Manual measuring range selection
4 MIN value storage
5 MAX value storage
6 Selected current and voltage type
7 Unit of measure
8 Filter active
9 Message: measurement value memory is full
10 Percentage memory full
11 Memory mode active
12 Menu operating mode active
13 Zero balancing
14 Continuity testing activated
15 Low battery
Meaning of symbols on the instrument
Warning concerning a point of danger
(Attention: observe documentation)
Ground
Continuous, doubled or reinforced insulation
CAT II Measuring category II instrument 600 V
Indicates EU conformity
This device may not be disposed with the
trash. For further details on the WEEE marking, please refer to our website www.gossenmetrawatt.com and enter search key ’WEEE’.
Calibration mark (blue seal):
23 6
7
891112
14
15
4
mV
FILTFULL REM%MEM
ZERO
MENU
o
F
A
I
uF
I
Hz
k
Ω
u
M
Ω
nF
C
o
k
AVE
ON
ON
MANDATA MIN MAX tEVENTS
DC
AC
5
1013
1
!
Serial number
Registration number
Date of calibraion (year – month)
German Accrediation Body GmbH – Calibration lab
XY123
2012-10
D-K-
15080-01-01
4 GMC-I Messtechnik GmbH
Table of Contents
Page
1 Safety Features and Precautions .................................... 5
2 Initial Start-Up ................................................................. 6
3 Selecting Measuring Functions and Ranges ................... 7
3.1 Automatic Measuring Range Selection ................................ 7
3.2 Manual Measuring Range Selection (Quick Measurements) .. 7
4 Digital Display (LCD) ........................................................ 7
5 Minimum and Maximum Value Storage
“MIN/MAX” with Time Stamp .......................................... 8
6 Voltage Measurement ..................................................... 8
6.1 Zero Balancing (for V, mA , Ω and °C) ................................ 9
6.2 Voltage Measurements for Greater than 600 V .................... 9
7 Current Measurement ................................................... 10
8 Resistance Measurement .............................................. 11
8.1 Continuity Testing for Resistance Measurement ................. 11
9 Frequency Measurement .............................................. 11
10 Temperature Measurement .......................................... 12
10.1 Temperature Measurement with Pt100 and Pt1000 .......... 12
10.2 Temperature Measurement with Thermocouple
and Reference Junction ................................................... 13
11 Storing Measurement Values to Memory ...................... 14
12 Setting Operating and Measurement Parameters ......... 14
12.1 Description of Measurement Parameters
and Memory Commands .................................................. 16
12.2 InFo – Information Menu ................................................ 16
12.3 Default Settings ............................................................... 16
13 Data Transmission via RS232 Interface ........................ 16
13.1 Selecting Interface Parameters ......................................... 17
14 Accessories ................................................................... 17
15 Characteristic Values .................................................. 18
16 Maintenance – Recalibration ........................................ 24
16.1 Batteries ......................................................................... 24
16.2 Power Pack ..................................................................... 25
16.3 Housing .......................................................................... 25
16.4 Recalibration ................................................................... 25
16.5 Device Return and Environmentally Compatible Disposal .... 26
17 Multimeter Display Messages ...................................... 26
18 Repair and Replacement Parts Service
Calibration Center
and Rental Instrument Service ...................................... 27
19 Manufacturer’s Guarantee ............................................. 27
20 Product Support ............................................................ 28
GMC-I Messtechnik GmbH 5
GB
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 multimeter has been manufactured and tested in
accordance with safety regulations
IEC/EN 61010–1:2010/
VDE 0411–1:2011. 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.
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 30 V may
occur (RMS value
).
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person
is present
.
• The maximum allowable voltage between the jacks (8) and earth is
600 V CAT II. Overload capacities are listed in chapter 15.
• 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
.
• Measurements under moist ambient conditions are not
permissible
.
• 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“.
• The current measuring ranges are protected by an internal
250 mA fusible link. A defective fuse can only be replaced by
GMC-I Service GmbH service personnel. The maximum permissible voltage for the measuring current circuit is
600 V AC/DC in the „mA“ ranges.
• The instrument may not be used in power installations.
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 for 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
.
6 GMC-I Messtechnik GmbH
Errors 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 further use.
Safe operation can no longer be relied upon
• if the instrument demonstrates visible damage,
• if the instrument no longer functions,
•
after a long period of storage under unfavorable conditions
.
2 Initial Start-Up
Batteries
Batteries have already been installed to your instrument, and it
is ready for operation. Refer to chapter 16.1, page 24, before
placing your instrument into service for the first time, or after it has
been in storage!
Switching the Instrument On Manually
Ð Press the MENU/ON | OFF key.
Activation is acknowledged with a brief acoustic signal.
As long as the key remains pressed, all segments of the
liquid crystal display (LCD) are active. The LCD is shown
on page 3.
After the key is released, the instrument is ready for
operation
.
Note!
Electrical discharge and high frequency interference can cause incorrect displays, and may
block the measuring sequence. To reset, switch
the instrument off, and then back on. If this
procedure is unsuccessful, briefly disconnect the
battery from its contact terminals.
Switching the Instrument Off Manually
Ð Press and hold the MENU/ON | OFF key, until the display is
deactivated.
Deactivation of the instrument is acknowledged by two
brief acoustic signals
.
Automatic Shut-Off
– As battery saving circuit:
Your instrument shuts itself off automatically, if the measurement value remains constant for a long period of time
(max. fluctuation < ±400 digits, 1 °C or 1 °F per minute), and if
none of the keys or the rotary switch are activated for a
period of 10 minutes. Deactivation of the instrument is
acknowledged by a brief acoustic signa
l.
Exceptions are as follows:
Transmit or memory mode, and continuous operation.
– If battery voltage drops below the required level:
The battery symbol ( ) appears approximately 10 minutes
before the instrument is shut down. Connect the NA HIT 2X
mains power pack and save data to a PC before replacing the
batteries.
Disabling Automatic Shut-Off
The instrument can also be switched to “CONTINUOUS ON”.
Ð Simultaneously press the ON/MENU/OFF key and the yel-
low multifunction key when switching the instrument on
.
The “CONTINUOUS ON” function is indicated at the LCD
with the symbol
.
GMC-I Messtechnik GmbH 7
GB
3 Selecting Measuring Functions and Ranges
3.1 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring range
selection. This automatic feature is active as soon as the
instrument is switched on, and automatically selects the
measuring range which provides optimum resolution.
The voltage measuring range selected in the V AC selector
switch position remains active after switching to frequency
measurement “Hz”, and automatic measuring range selection
is disabled. We thus recommend the selection of a suitable
voltage measuring range in the V AC selector switch position
before switching to frequency measurement.
The instrument selects the measuring range automatically for
the following measured quantities:
3.2 Manual Measuring Range Selection
(Quick Measurements)
Measurements performed using a suitable fixed measuring
range are executed more quickly than those which utilize automatic range selection. Automatic range selection can be deactivated, and ranges can be manually selected according to the
following table.
The manual mode is deactivated by pressing and holding the
MAN|AUTO key (approx. 1 s), by activating the rotary switch or by
switching the instrument off and back on again.
4 Digital Display (LCD)
The measurement value appears at the digital display with correct decimal place and plus or minus sign. The selected unit of
measure and the type of current are displayed as well. A minus
sign appears in front of the numeric value for the measurement
of zero-frequency quantities, if the positive pole of the measured quantity has been connected to the “–V” input.
If the measuring range upper limit of 1,250,000 is exceeded for
measured quantities V and mA, “0L ” is displayed (overload).
The digital display is refreshed every 0.5 to 2 s (see “Display
Update” on page 21).
Measured Quantity
Resolution
Switching to the Next
Highest Range
at ±(... d + 1 d)
Switching to the Next
Lowest Range
at ±(... d –1 d)
V, Ω, Hz 6½ 1100 000 100000
V , mA 5½ — 100000
MAN/
AUTO
Function
Acknowledge
Display
Acoust.
Signal
Brief
Manual Mode Active:
selected measuring range is frozen
MAN 1 x
Brief
Switching sequence for:
V:
100 mV→ 1V→ 10 V→ 100 V→ 600 V→ 100 mV → ...
mA: 100 μA → 1mA→ 10 mA → 100 mA → 100 μA...
Ω: 100 Ω→ 1kΩ→ 10 kΩ→ 100 kΩ→ 1MΩ→
10 MΩ ... → 100 Ω
MAN 1 x
Long Return to Automatic Range Selection — 2 x
8 GMC-I Messtechnik GmbH
5 Minimum and Maximum Value Storage
“MIN/MAX” with Time Stamp
Minimum and maximum measurement values can be stored to
memory with the MIN/MAX function. The most important application for this function is the determination of minimum and
maximum values during long-term observation of measurement values. It can be activated for all measuring functions.
Ð Apply the measured quantity to the instrument.
Ð Select the measuring range with MAN |AUTO.
Ð Activate the MIN/MAX function.
Ð Repeated activation of the AVE/MIN |MAX key causes switching
amongst:
MAX > t > MIN > t > MAX ...
The measuring ranges can only be selected manually when the
“MIN/MAX” function is active.
The “MIN/MAX” function is deactivated, and stored MIN and
MAX values are deleted by pressing and holding the MIN/MAX
key (approx.. 1 s), by activating the rotary switch or by switching the instrument off and back on again.
6 Voltage Measurement
Ð Depending upon the voltage to be measured, set the
rotary switch to
V or V .
Ð Connect the measurement cables as shown. The “V” jack
should be grounded.
Note!
In the 600 V range, an intermittent acoustic signal
sounds alarm if the display value exceeds 600 V.
Attention!
!
Make absolutely certain that none of the current
ranges are active when the multimeter is connected
for voltage measurements! If the breaking limit values for the electronic fuse are exceeded due to
operator error, both the operator and the instrument
are in danger! Simultaneous connection to both current and voltage measuring circuits is prohibited!
–V +
– /
⊥
+ ~
⊥
/
V
DC
V
AC
GMC-I Messtechnik GmbH 9
GB
6.1 Zero Balancing (for V , mA , Ω and °C)
Ð Select the desired measuring range with the MAN | AUTO key.
Ð 2-Wire Resistance Measurement, Current Measurement
or Temperature Measurement with Pt100 or Pt1000:
short-circuit the positive and negative poles of sockets
„mAΩ2“ or „°C
2
“, respectively.
Voltage Measurement, Temperature Measurement with
Thermocouple or 4-Wire Resistance Measurement:
short-circuit the positive and negative poles of sockets
„V/ °CTC“ or „ΩSense“, respectively.
Ð Briefly press the MAN| AUTO and AVE/MIN|MAX keys
simultaneously.
The instrument acknowledges zero balancing with an
acoustic signal and
“000.0000” (±1 digit, decimal place
depends upon measuring range) and the “ZERO” symbol
appear at the LCD
. The previously displayed measurement
value serves as a reference value (max. ±30 000 digits).
Ð Zero balancing can be deleted:
– by pressing the MAN|AUTO key
after which deletion is acknowledged with an acoustic
signal,
– by selecting a different measuring function
– or by switching the instrument off.
Note
The zero balancing values (offset) for temperature measurement are stored to memory in the resistance and/or voltage
measurement ranges and serve as reference values.
6.2 Voltage Measurements for Greater than 600 V
Voltages of greater then 600 V can be measured with a highvoltage probe, for example the HV3 or the HV30. The earthing
terminal must be connected to ground for measurements of
this type. Observe all required safety precautions!
Function Measuring Range / Function
°
C
2
Pt100: 1 kΩΩ2
Pt1000: 10 kΩΩ2
°
C
4
Pt100: 1 k ΩΩ4
Pt1000: 10 kΩΩ4
°
C
TC
100 mV V
–V
Voltage Measurements for
Greater than 600 V
with the HV3 High-Voltage
Probe
black
black
red
x1000
x100
max. 3000 V
+
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