Fluke 1625 User Manual page 51

START
TEST
DISPLAY
MENU
Earth/Ground Resistance 300 k
CHANGE
ITEM 3
SELECT
Figure 14. Correcting Clip-on Transformer Errors
2. Turn central rotary switch to position "A RE 3pole".
3. Press "START TEST"-button and note result of RE value.
4. Connect clip-on transformer.
START
TEST
DISPLAY
MENU
Earth/Ground Resistance 300 k
CHANGE
ITEM 3
POLE
OFF
SELECT
5. Turn central rotary switch to position "A RE 3pole".
6. Press "START TEST" again.
If the thus measured value R
clip-on transformer by more than 5 %, adjust the clip-on transformation ratio
(tr) correspondingly:
trnew trold
1625 EARTH / GROUND TESTER
H/C2
S/P2
AC
Resistance
300 k DC Low Resistance 3k
RA R R
2
POLE
4
POLE
2
3 POLE
POLE
4 4
POLE POLE
ES/P1
POLE
OFF
E /C1
1625 EARTH / GROUND TESTER
H/C2
S/P2
AC
Resistance
300 k DC Low Resistance 3k
RA R R
2 POLE
4
POLE
3 2
POLE POLE
4 4
POLE POLE
ES/P1
E /C1
deviates from the R
E
R ( withclip
E
R ( withoutcli
E
Procedure of Measurements
value determined without
E
ontransfor mer
p onTransfpr
Earth/Ground Tester
)
mer )
edw017.eps
edw018.eps
43