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Operating Instructions
METRAHIT⏐27 and METRAHIT⏐H+E
METRA HIT 27M:
METRA HIT 27I:
METRA HIT H+E
CAR
Digital Multimeter and Milliohmmeter
Digital Multimeter, Milliohmmeter and Megohmmeter
: Mega Tester for Hybrid E-cars
CAR
3-349-207-02
12/4.16

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Summarization of Contents

Selecting Measuring Functions and Measuring Ranges
Automatic Measuring Range Selection
Automatic selection of appropriate measuring range.
Manual Measuring Range Selection
Manual selection of measuring range.
Quick Measurements
Performing measurements quickly.
Voltage and Frequency Measurement
Voltage Measurement [V]
Performing voltage measurements using various ranges.
Frequency Measurement [Hz]
Measuring signal frequency using the V~/Hz function.
Resistance and Diode Measurements
Resistance Measurement (2-wire connection) [Ω]
Performing resistance measurements using 2-wire method.
Continuity Test during Resistance Measurement
Performing continuity test with acoustic signal.
Diode Measurements
Testing diodes for forward and reverse bias.
Milliohm Measurement (4-Pole-Measurement)
Compensation of Cable Resistance
Compensating for cable resistance in measurements.
Thermovoltage Compensation
Compensating for voltage errors due to temperature differences.
Milliohm Measurement with 200 mA or 20 mA DC [mΩ]
Measuring milliohms using 200mA or 20mA DC current.
Milliohm Measurement with 1 A Pulsating Measuring Current [mΩ@1 A]
Measuring milliohms with 1A pulsating current.
Insulation Resistance Measurement [ΜΩ@...V]
Preparing for Measurement
Steps before performing insulation resistance measurements.
Insulation Resistance Measurement
Procedure for measuring insulation resistance.
Ending the Measurement and Discharging
Safely ending measurement and discharging DUT.
Using the Menus – from the Initial InFO Menu to Operating and Measuring Parameters
Sampling rAtE
Setting the time interval for data transmission/storage.
Saving Measured Values
Options for storing measured data.
Querying Memory Occupancy – INFO ▷ MEMO/OCCUP
Querying current memory occupancy percentage.
Clearing the Memory – MEMO ▷ CLEAR
Deleting all measured values from memory.
Activating the Default Values
Resetting the instrument to default settings.
Transmission Mode Operation with RS 232 Interface
Transmitting measurement data to a PC via RS 232 interface.
Maintenance
Storage Batteries and Batteries
Information on handling and replacing batteries.
Removing the Storage Batteries During Periods of Non-Use
Advice on removing batteries for long-term storage.
Checking Storage Battery Charge-Level and Condition
How to check battery status and condition.
Recharging the Storage Batteries
Procedure for recharging instrument storage batteries.
Replacing the Storage Batteries
Step-by-step guide for replacing storage batteries.
Fuses
Information on fuse types and replacement.
Housing
Cleaning and maintenance of the instrument housing.
Disposing of Batteries or Storage Batteries
Proper disposal of used batteries.

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