User Manual
Table Of Contents
- 1 Scope of Delivery
- 2 Application
- 3 Safety Features and Precautions
- 4 Initial Start-Up
- 5 General Notes
- 5.1 Connecting the Instrument
- 5.2 Automatic Settings, Monitoring and Shut-Off
- 5.3 Measurement Value Display and Memory
- 5.4 Testing Earthing Contact Sockets for Correct Connection
- 5.5 Help Function
- 5.6 Setting Parameters or Limit Values using RCD Measurement as an Example
- 5.7 Freely Selectable Parameter Settings or Limit Values
- 5.8 2-Pole Measurement with Fast or Semiautomatic Polarity Reversal
- 6 Measuring Voltage and Frequency
- 7 Testing RCDs
- 8 Testing of Breaking Requirements for Overcurrent Protective Devices, Measurement of Loop Impedance and Determination of Short-Circuit Current (functions ZL-PE and IK)
- 9 Measuring Line Impedance (ZL-N function)
- 10 Earthing Resistance Measurement (RE function)
- 11 Measurement of Insulation Resistance
- 12 Measuring Low-Value Resistance up to 200 Ohm (protective conductor and equipotential bonding conductor)
- 13 Special Functions – EXTRA Switch Position
- 14 Database
- 15 Attaching the Test Probe Holder to the Carrying Strap
- 16 LED Indications, Mains Connections and Potential Differences
- 17 Characteristic Values
- 18 Maintenance
- 19 Appendix
- 19.1 Tables for Determining Maximum or Minimum Display Values in Consideration of Maximum Measuring Uncertainty
- 19.2 At which values should/must an RCD actually be tripped? Requirements for Residual Current Devices (RCDs)
- 19.3 Periodic Testing per DGUV Regulations 3 (formerly BGV A3) – Limit Values for Electrical Systems and Operating Equipment
- 19.4 Optional Accessories (not included)
- 19.5 List of Abbreviations and their Meanings
- 19.6 Keyword Index
- 19.7 Bibliography
- 20 Repair and Replacement Parts Service Calibration Center* and Rental Instrument Service
- 21 Recalibration
- 22 Product Support
36 GMC-I Messtechnik GmbH
12.1 Measurement with Constant Test Current
Start Measurement
Press and hold for long-
term measurement
Attention!
!
The test probes should always be in contact with the DUT be-
fore the
ON/START key is activated.
If the object is energized, measurement is disable as soon as it
is contacted with the test probes.
If the
ON/START key is pressed first and the test object is con-
tacted with the test probes afterwards, the fuse blows.
In the case of single-pole measurement, the respective value is
saved to the database as RLO.
Automatic Polarity Reversal
After the measuring sequence has been started, the instrument
performs measurement with automatic polarity reversal, first with
current flow in one direction, and then in the other. In the case of
long-term measurement (press and hold the
ON/START key), polar-
ity is switched once per second.
If the difference between RLO+ and RLO– is greater than 10%
with automatic polarity reversal, RLO+ and RLO– values are dis-
played instead of RLO. The respectively larger value, RLO+ or
RLO–, appears at the top and is saved to the database as the
RLO value.
Evaluating Measurement Results
Differing results for measurements in both directions indicate volt-
age at the DUT (e.g. thermovoltages or unit voltages).
Polarity Selection Display Condition
+ pole to PE RLO+ None
– pole to PE RLO– None
± pole to PE
RLO Where ∆RLO ≤ 10%
RLO+
RLO–
Where ∆RLO > 10%