Setting Limit Values; Evaluating The Measurement Values - Gossen MetraWatt ProFiTEST C-GB int. Operating Instructions Manual

Manual Measuring Range Selection
Manual measuring range selection is provided for in case earthing resis-
tance needs to be measured in systems which are equipped with RCCBs.
The instrument's test current I
T
to prevent undesired tripping of the RCCB.
4..740 mA 740 mA 400 mA 40 mA
START
➭
Press the RANGE key.
➭
Select the measuring range with a test current which is less than the
tripping current of the utilized RCCB.
➭
Start the measurement as described above.
Note
When manual range selection is used it must be observed that
indicated accuracy values are only valid starting at 5% of the
upper range limit value (except for 10 range, separate entry for
small values).
8.2

Setting Limit Values

A limit value can be selected for earthing resistance. If a measurement
value exceeds this limit value, the U
30
must be taken into consideration in order
4 mA
LED lights up.
L
➭
Press the LIMIT key.
➭
First enter the numeral for the hundreds place.
Display the desired numeral with the
After a numeral has been selected, the cursor moves one place to the
right. After the tens and the units have been entered, the cursor
moves to position _ for ohms, or position k for kilo-ohms. The start
menu appears after this last entry has been made.
8.3

Evaluating the Measurement Values

With the help of the on page 34, maximum resistance display values can
be determined which may not be exceeded under consideration of the
device's maximum measuring error in order to avoid exceeding the
required earthing resistance. Intermediate values can be interpolated.
Note
Measurement Value Processing with PC Software (e.g. PS3)
Only one R measurement value is entered to some of the report
E
forms. In order to assure that the PC software enters the desired
value, enter the ! symbol as the first character in the comment line
after the value has been saved to memory (see chapter 4.5),
for example: !Foundation earth.
or the key to this end.
GMC-I Messtechnik GmbH