1. Fluke-1625
GEO Earth Ground Testers

2. Description of the Operating Elements

3. Detail of Panel
66

4. Panel Description

5. Panel Description

6. LCD Display
1. Digital display of measured value
2. Measuring function field to display measuring
function
3. Unit field: V, Ω, kΩ, Hz
4. Special characters for operator guidance

7. RA 2-pole, 3-pole Measurements
To make 2-pole or dead-earth measurements, connect a jumper between terminals
H/C2 and S/P2 with the supplied connector cable. Refer to Figure. Then follow steps 1
thru 4 except use only earth electrode and the auxiliary earth electrode with minimum
distance between them of 20 m.
A Select function RA 3-pole. Display is as shown below.

10. RA 4-pole Measurements

12. RA 3-pole Selective Earth Resistance Measurement with
Current Clamp

14. RA 4-pole Selective Earth Resistance Measurement with
Current Clamp

16. Measurement of Resistances
• Resistance Measurement (R~)
This measuring function determines the ohmic resistance between 0.001 Ω and
300 kΩ. The measurement is done with AC voltage. For measurements of very low
resistances a compensation of the connecting leads is suggested (see
“Compensation of Measuring Lead Resistance”).

18. • Resistance measurement (RF)
In this measuring mode all resistances from 0.001 Ω to 3 kΩ can be measured with
DC voltage and automatic polarity reversal as per EN61557-5. To achieve highest
accuracy 4 pole measurements are possible. To balance the extension lead, a
compensation has to be done.