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1625-2
Users Manual
30
3. Press "START TEST"-button and note result of R
E
value.
4. Connect clip-on transformer. See Figure 9.
edw018.eps
Figure 9. Clip-on Transformer Connection
5. Turn central rotary switch to position " RE 3pole".
6. Press "START TEST" again.
If the measured value R
E
deviates from the R
E
value determined without clip-on
transformer by more than 5 %, adjust the clip-on transformation ratio (tr) correspondingly:
)(
)(
meronTransforpwithoutcliR
merontransforwithclipR
troldtrnew
E
E
−
−
×=
Example:
Your clip-on transformer has a transformation ratio of tr = 1000:1. The measurement
without clip-on transformer results in a value R
E
= 0.983 Ω. With a clip-on transformer a
value of R
E
= 1.175 Ω is measured.
The deviation thus reads (1.175 - 0.983) Ω = + 0.192 Ω and referring to R
E
= 0.983 Ω an
error evolves as following:
%5.19
983.0
192.0
%100 +=
Ω
Ω
×
The new transformation ratio to be set calculates:
1195
983.0
175.1
1000 =×=trnew
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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