Manual

6 Gossen Metrawatt GmbH
3 Documentation
This documentation describes several test instrument.
As a result, features and functions may be described which do
not apply to your instrument. Furthermore, illustrations may differ
from your instrument.
Note
These operating instructions describe a test instrument
with software/firmware version 1.16.20.
List of Abbreviations and their Meanings
RCCBs (residual current circuit breakers / RCDs):
I

Tripping current
I
N
Nominal residual current
I
F
Rising test current (residual current)
PRCD Portable residual current device
PRCD-S:
with protective conductor detection and monitoring
PRCD-K:
with undervoltage trigger and protective conductor
monitoring
RCD- Selective RCCB
R
E
Calculated earthing or earth electrode loop resistance
SRCD Socket residual current device (permanently installed)
t
a
Time to trip / breaking time
U
I
Touch voltage at moment of tripping
U
IN
Touch voltage
relative to nominal residual current I
N
U
L
Touch voltage limit value
Overcurrent protective devices:
I
SC
Calculated short-circuit current (at nominal voltage)
Z
L-N
Supply impedance
Z
L-PE
Loop impedance
Earthing:
R
B
Operational earth resistance
R
E
Measured earthing resistance
R
ELoop
Earth electrode loop resistance
Low-value resistance at
protective, earthing and bonding conductors:
R
LO+
Equipotential bonding conductor resistance (+ pole to
PE)
R
LO–
Equipotential bonding conductor resistance (– pole to
PE)
Insulation:
R
E(INS)
Earth leakage resistance (DIN 51953)
R
INS
Insulation resistance
R
ST
Standing surface insulation resistance
Z
ST
Standing surface insulation impedance
Current:
I
A
Breaking current
I
L
Leakage current (measured with current clamp trans-
former)
I
M
Measuring current
I
N
Nominal current
I
P
Test current
Voltage:
f Line voltage frequency
f
N
Nominal voltage rated frequency
U Voltage drop as %
U Voltage measured at the test probes during and after
insulation measurement R
INS
U
Batt
(Rechargeable) battery voltage
U
E
Earth electrode voltage
U
INS
When measuring R
INS
: test voltage for ramp function:
tripping or breakdown voltage
U
L-L
Voltage between two phase conductors
U
L-N
Voltage between L and N
U
L-PE
Voltage between L and PE
U
N
Nominal line voltage
U
3~
Highest measured voltage during determination of
phase sequence
U
S-PE
Voltage between probe and PE
U
Y
Phase-to-earth voltage
4 Getting Started
1. Read and adhere to the product documentation. In particular
observe all safety information in the documentation, on the
instrument and on the packaging.
See:
– section 1, “Safety Instructions”, on page 4
– section 2, “Applications”, on page 5
– section 3, “Documentation”, on page 6
2. Familiarize yourself with the test instrument.
See:
– section 5, “The Instrument”, on page 7
– section 6, “Operating and Display Elements”, on page 16
– section 7, “Operation”, on page 26
3. Enter the basic settings.
See section 8, “Instrument Settings”, on page 27.
4. Optional but recommended: Create a database in the test
instrument. See section 9, “Database”, on page 31.
5. Read the basic information provided in section 10, “General
Information on Measurements”, on page 36.
6. Perform measurements.
Refer to individual measurements or test sequences (auto-
matic sequences):
– section 11, “Measuring Voltage and Frequency”, on page
41
– section 12, “
Testing RCDs ”, on page 43
– section 13, “Testing of Breaking Requirements for Overcur-
rent Protective Devices, Measurement of Loop Impedance
and Determination of Short-Circuit Current (ZL-PE and I
SC
Functions)”, on page 54
– section 14, “Measuring Supply Impedance (Z
L-N
Function)”,
on page 57
– section 15, “Earthing Resistance Measurement (Function
R
E
)”, on page 59
– section 16, “
Measurement of Insulation Resistance ”, on page
73
– section 17, “
Measuring Low-Value Resistance of up to 200 
(Protective Conductor and Equipotential Bonding Conductor) ”,
on page 77
– section 18, “Measurement with Accessory Sensors”, on
page 80
– section 19, “Special Functions – EXTRA Switch Position”,
on page 81
– section 20, “Test Sequences (Automatic Test Sequences) –
AUTO Function”, on page 95
Further interesting information: section 21, “Maintenance”, on
page 97.
S