Gossen MetraWatt METRAHIT Base Manual de usuario

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

2MENU/ON|OFF key

Menu Operating Mode: Entry acknowledgment (ENTER or ↵)

3AVE/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

4MAN|AUTO key for manual measuring range selection

Menu Operating Mode: selection of individual parameters,

forward flux direction,

reduce values

5ESC|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

GMC-I Messtechnik GmbH 3

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 mark-

ing, please refer to our website www.gossen-

metrawatt.com and enter search key ’WEEE’.

Calibration mark (blue seal):

23 6

891112

FILTFULL REM%MEM

ZERO

AVE

MANDATA MIN MAX

t EVENTS

DC AC

1013

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 , Ωand °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

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 Euro-

pean 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 exam-

ple, capacitors may be dangerously charged.

•Make certain that the measurement cables are in

flawless condition, e.g. no damage to insulation, no inter-

ruptions 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 val-

ues 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 per-

missible 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 instru-

ment 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

ÐPress 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 interfer-

ence 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

ÐPress 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 mea-

surement 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 signal.

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”.

ÐSimultaneously 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

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 auto-

matic range selection. Automatic range selection can be deac-

tivated, 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 cor-

rect 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 mea-

sured 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 Reso-

lution

Switching to the Next

Highest Range

at ±(... d + 1 d)

Switching to the Next

Lowest Range

at ±(... d –1 d)

V,Ω, Hz 6½ 1100000 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:

100 mV

→

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 appli-

cation for this function is the determination of minimum and

maximum values during long-term observation of measure-

ment values. It can be activated for all measuring functions.

ÐApply the measured quantity to the instrument.

ÐSelect the measuring range with MAN|AUTO.

ÐActivate the MIN/MAX function.

ÐRepeated 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 switch-

ing the instrument off and back on again.

6 Voltage Measurement

ÐDepending upon the voltage to be measured, set the

rotary switch to V orV .

ÐConnect 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 val-

ues for the electronic fuse are exceeded due to

operator error, both the operator and the instrument

are in danger! Simultaneous connection to both cur-

rent and voltage measuring circuits is prohibited!

–V +

– /

⊥

GMC-I Messtechnik GmbH 9

6.1 Zero Balancing (for V , mA , Ωand °C)

ÐSelect the desired measuring range with the MAN|AUTO key.

Ð2-Wire Resistance Measurement, Current Measurement

or Temperature Measurement with Pt100 or Pt1000:

short-circuit the positive and negative poles of sockets

„mAΩ2“ or „°C2“, 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.

ÐBriefly 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. ±30000 digits).

ÐZero 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 measure-

ment 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 high-

voltage 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

Pt100: 1 kΩΩ

Pt1000: 10 kΩΩ

Pt100: 1 k ΩΩ

Pt1000: 10 kΩΩ

100 mV V

–V

Voltage Measurements for

Greater than 600 V

with the HV3 High-Voltage

Probe

black

red

x1000 x100

max. 3000 V

10 GMC-I Messtechnik GmbH

7 Current Measurement

ÐFirst disconnect supply power to the measuring circuit or the

load component, and discharge any capacitors which may

be present.

ÐSet the selector switch to “mA”.

After this selection has been made with the rotary switch, the

DC current mode is always active.

ÐSelect the current type, either “DC” or “AC+DC”, which cor-

responds to the measured quantity by briefly pressing the

multifunction key. Double check for correct current type at

the LCD.

ÐSecurely connect the instrument to the load component in

series as shown (without matching resistor).

Zero Balancing, see chapter 6.1, page 9

Current Measurement Tips:

• The instrument may not be used in power installations.

• The measuring circuit must be mechanically stable and pro-

tected against unintentional interruption. Conductor cross

sections and connection points must be substantial enough

to avoid excessive overheating.

• In the 100 mA measuring range, an intermittent acoustic sig-

nal warns you if the measurement value has exceeded the

measuring range upper limit value.

• The current ranges are protected by an internal 250 mA fus-

ible 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.

–mA +

– (+) / ~

+ (–) / ~

max. 600 V !

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