User manual
8 GMC-I Messtechnik GmbH
3.1 Error and Limit Value Messages
The following limit values are indicated
1)
Resistance between housing and mains plug in connector cables up to a length of 5 m
2)
For extension cables, there is an additional resistance of 0.1 Ω for each
additional 7.5 m, up to a maximum, however, of 1 Ω
3)
For safety class I devices with activated heating elements
(if heating power > 3 kW and R
ISO
< 0.3 MΩ:
leakage current measurement required)
4)
Limit value per DIN VDE 0702:1995
5)
This limit value applies for all-pole switches
(corresponds to a doubling of the limit value
or, respectively, a 50 % reduction of the actual measuring current)
Residual Current Limit Value Violations
The METRATESTER 5 is equipped with a selector switch independent, residual current monitoring
function. If the red error lamp lights up and no message regarding a limit value violation
appears at the display, residual current at the mains outlet is dangerously high – regardless of
the selector switch setting. If this is the case, it is advisable to measure residual current (dif-
ferential current) by turning the selector switch to the “I
DIFF
” position.
Only the displayed numeric value should be considered when evaluating residual current with
the selector switch in the “I
DIFF
” position. The error lamp may be caused to light up as a result
of residual current monitoring for values of as low as approximately 3.2 mA. The error lamp
lights up in any case as of 3.5 mA.
Error Message Condition PE Signal Lamp
Protective conductor potential, at mains U
B
> 100 V If contact surface is contacted
Measurement
Error
Condition per
Standard
Test Instrument Indicates When Limit Values
Are Exceeded
Red Error Lamp
Continuously Lit
Limit Values are
Displayed
Continuous Acoustic
Signal (Beeper)
Protective
Conductor
Resistance
R
SL
>0.3Ω
1)
• >0.3Ω —
R
SL
>1Ω
2)
• >1Ω•
Insulation
Resistance
Heating
3)
:
R
ISO
<0.3MΩ
• <0.5MΩ
4)
•
SCI:
R
ISO
<1.0MΩ
• <2.0MΩ —
SCII:
R
ISO
<2.0MΩ
—<2.0MΩ —
Equivalent
Leakage Current
I
EA
>3.5mA • ——
• >7.0mA
5)
•
Leakage/Contact
Current
(Substantiation
of Absence of
Voltage)
Part 240:
I
A
>0.25mA
• >0.25mA —
I
A
>0.5mA • >0.5mA •
Residual Current I
Diff
≥ 3.5 mA • — •