Gossen MetraWatt METRAHIT COIL Manual

METRAHIT I
SO
TRMS Multimeter with Insulation Measurement
and Interturn Short-circuit Measurement
• Insulation resistance measurement up to 3.1 GΩ with interference volt-
age detection, test voltages: 50 V, 100 V, 250 V, 500 V, 1000 V
• Interturn short-circuit measurement with 1000 V (METRAHIT COIL only)
Multimeter with diverse functions (V, Ω, F, Hz)
•
• TRMS measurements: TRMS AC / AC+DC for current/voltage up to 10 kHz
• Activatable low-pass filter, 1 kHz/–3 dB in the V AC range
• Direct current measurement, 100 nA to 10 A
• Current measurement with clip-on current sensors – CLIP
A transformation ratio of 1 mV:1 mA to 1 mV:1 A can be
selected and is taken into consideration at the display.
• Precision temperature indicator, °C or °F,
for Pt100/Pt1000 sensors and type K thermocouples
• Diode measurement (I = 1 mA, U
K
• Duty cycle measurement, 5 to 95% (METRAHIT COIL only)
• Display: 3¾ digits, 3100 steps, illumination can be activated
• Acoustic signals for: continuity testing, dangerous contact
voltages, exceeded overload limits
• Min-Max value storage
• Data memory and internal clock, power pack adapter socket
• IP 54 Housing protection, dust and splash protected, protective cover
• Bidirectional infrared interface for exchanging data with a PC
• Windows software available as accessory for processing and
graphic display of measured values via USB interface
Application
The METRAHIT ISO and METRAHIT COIL multimeters are rugged porta-
ble measuring instruments. They are suitable for servicing house-
hold appliance, machines (e.g. forklifts) and systems (e.g. photo-
voltaic). The instruments can be used in the field and are
equipped with an internal, mains-independent power supply.
METRAHIT COIL allows for interturn short-circuit measurements in
combination with the COIL TEST ADAPTER. By comparing the mea-
surement results, asymmetries at the windings of 3-phase machi-
nes can be directly detected, which, in turn, is an indication of
possible short-circuits. In the case of single-phase motors testing
is performed by comparison with a known setpoint value.
Interturn short-circuit measurement in the inductance range with
the standard adapter COIL: 10 μH to 50 mH @ 100 Hz
The standard adapter COIL is universially suitable for a great num-
ber of electric machines of different performance classes. With
regard to DIN standard motors this corresponds to performances
from approximately 15 kVA to 80 MVA. Adapters for motors with
different inductivity are available upon request.
Features
RMS Value with Distorted Waveshape
The utilized measuring method allows for waveshape independent
TRMS measurement of periodic quantities (AC) and pulsating
quantities (AC and DC) for voltage and current at up to 10 kHz.
GMC-I Messtechnik GmbH
and METRAHIT
to 5.1 V) and continuity testing
flow
C
OIL
600 V CAT III
1000 V CAT II
Activatable Filter for V AC Measurement
A 1 kHz low-pass filter can be activated if required, e.g. for
measurements at cables with parasitic external signals. The input
signal is checked by a voltage comparator for dangerous voltages
as long as the low-pass filter is activated, which are indicated at
the display if present.
Diode Testing with Constant Current I
This function can be used to test the polarity of diodes, and to
test electrical circuits for short-circuiting and interruptions. The
test voltage source makes it possible to measure LEDs and
reference diodes up to 5.1 V, e.g. also white LEDs.
Fast Acoustic Continuity Test I
Testing for short-circuiting and interruption is possible with the
selector switch in the
acoustic signaling can be set to 1, 10, 20, 30, 40 or 90 Ω.
Insulation Resistance Measurement with Interference Voltage Detection
Depending upon the utilized instrument variant, insulation resistance can
be measured with an adjustable test voltage of 50 to 1000 V.
If the instrument detects interference voltage of greater than
15 V AC or 25 V DC during insulation testing, an error message is
briefly displayed at the LCD panel. The instrument is then
automatically switched to voltage measurement TRMS (AC + DC)
with an input resistance of approximately 1 MΩ and the currently
measured voltage value is displayed.
Analog Scale for Quick Trend Display – Pointer
The analog scale (with additional negative axis range for zero-
frequency quantities) allows for faster recognition of measured
value fluctuation than is possible with a digital display.
(C only)
OIL
= 1 mA
c
= 1 mA
k
position. The threshold value for
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