Appx.
4
Measurement Principle
(2) 2-pole method (simplified measurement)
The figure below shows the basic circuit principle for a simplified
earth resistance measurement using an existing earthing body.
Where the earth resistance of the existing earthing body is given by
Ro; and the earth resistance of the measurement object, by Rx, the
same equation as for the 3-pole method applies:
Rx + Ro = Rs/n
Thus, the earth resistance can be found by adding the earth
resistance of the existing earthing body (Ro) to the earth resistance
of the measurement object (Rx).
In addition, the FT3151 uses a significantly low measurement
current, in order that the leakage current circuit breaker of a
commercial power supply does not be tripped when the grounded
side of an AC outlet is used as existing earthing body.
Synchronous
rectifier
Oscillator
S(P)
1:n
H(C)
Galvanometer
Rs
E
Rx
S
Ro
Measurement principle diagram (2-pole measurement)
Summary of Contents for FT3151
Page 1: ......
Page 2: ......
Page 5: ...1 HIOKI FT3151 FT3151 1 L9840 1 2 1 6 mm 270 mm 235 mm SUS304 L9841 1 4 m L9842 11 1 10 m...
Page 7: ...3 L9843 51 50 m L9843 52 50 m L9844 3 1 2 m 9050 2 1 300 mm 300 mm C0106 Z5022...
Page 8: ...4 IEC 61010...
Page 9: ...5...
Page 10: ...6 DC AC EU WEEE EU f s rdg dgt f s rdg dgt 1...
Page 11: ...7 IEC61010 CAT CAT CAT CAT CAT 300 V CAT CAT CAT T CAT II CAT IV CAT III...
Page 12: ...8 2...
Page 13: ...9 3 1 p 41 IH...
Page 14: ...10 L9787 L9840 p 7...
Page 15: ...11 1 1 1 1 2 1 EN 61557 JIS C 1304 2002 IEC 61010 2 115 10 100 3 4 5 6 2 3 4 5 6 7...
Page 16: ...12 7 MEASURE 8...
Page 17: ...13 1 3 1 2 3 4 5 6 7 8 9 11 10 14 13 12 15 p 23 2 3 4 5 6 7...
Page 18: ...14 1 MEASURE 2 3 Poles 2 3 4 Hz 575 Hz 600 Hz 5 6 7 8 9 10 11 ADJUST 12 E 13 S P 14 H C 15...
Page 20: ...16 1 4 C0106...
Page 21: ...17 Z5022 1 5 Z5022 Z5022 2 3 4 5 6 7...
Page 22: ...18 Z5022...
Page 23: ...19 2 p 8 2 L9841 L9842 11 L9842 22 L9843 51 L9843 52 50 V 1 2 3 4 4 5 6 7...
Page 24: ...20 L9787 L9844...
Page 25: ...21 2 1 p 26 p 33 ADJUST MEASURE 1 2 3 4 4 5 6 7...
Page 26: ...22 1 3 Poles 3 2 Poles 2 2 3 MEASURE 0 0...
Page 27: ...23 3 2 2 3 50 V 3 2 3 p 25 2 E H C S P H C S P 20 A 1 2 3 4 4 5 6 7...
Page 28: ...24 3 CAT 300 V rms 0...
Page 29: ...25 3 1 5 3 10 m 10 m S P H C E 2 1 E 2 2 3 4 E S P 5 1 2 3 4 4 5 6 7...
Page 30: ...26 3 E S H 5 m 10 cm 3 Poles 3 Hz 575 Hz 600 Hz 575 600 MEASURE 4 2 p 46...
Page 31: ...27 3 V MEASURE MEASURE 10 V 1 2 3 4 4 5 6 7...
Page 32: ...28 3 1 H C H MEASURE S H CHECK 2 S P S MEASURE S H CHECK...
Page 34: ...30 2 2 3 2 85 V 50 V E E 300 V...
Page 35: ...31 2 L9787 L9841 L9842 11 L9842 22 L9843 51 L9843 52 2 2 TT D 100 Rx Ro B 10 3 1 2 3 4 4 5 6 7...
Page 36: ...32 2 2 V E E H C E E S P H C Ro 5 m E 2 A 1 5 m...
Page 37: ...33 2 2 Poles 2 Hz 575 Hz 600 Hz 575 600 MEASURE 4 2 p 46 1 2 3 4 4 5 6 7...
Page 38: ...34 2 V MEASURE H S MEASURE 10 100 MEASURE...
Page 39: ...35 2 4 1 2 3 H S 4 9050 9050 1 2 3 4 4 5 6 7...
Page 40: ...36 2 5 3 2 10 k A 1 H S 7 k...
Page 42: ...38 S P E H C E H C 5 m E H C 29 S P 5 m 5 m 29 S P H C E 9050...
Page 43: ...39 1 2 3 4 4 5 6 7...
Page 44: ...40 10 V 10 V 5 V Hz 575 600...
Page 49: ...45 4 4 4 1 1 2 3 5 6 7...
Page 50: ...46 4 2 3 LR6 6...
Page 51: ...47 4 A B 1 2 3 A 4 6 5 B 6 1 2 3 5 6 7...
Page 52: ...48 4 3 4 4 4 5 p 49...
Page 53: ...49 4 4 5 MEASURE MEASURE 0 S H E H S 0 1 2 3 5 6 7...
Page 54: ...50 2 2 2 1 2 10 0...
Page 55: ...1 1 Hz 1 kHz E S P H C 10 m 1 2 3 4 5 6 7...
Page 57: ...3 2 2 2 Ro Rx 3 Rx Ro Rs n Ro Rx S P H C Ro Rx Rs S E 2 1 2 3 4 5 6 7...
Page 59: ...16 09 JA...
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Page 61: ...FT3151 Instruction Manual ANALOG EARTH TESTER Aug 2017 Revised edition 1 FT3151A980 01 EN...
Page 62: ......
Page 84: ...20 Attaching Model Z5022 Shoulder Strap...
Page 122: ...58 Before Returning for Repair...
Page 127: ...16 01 EN...
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