MI 3290 Earth Analyser
Technical specifications
128
15.1.2 Selective (Iron Clamp)
Measurement principle: ............................... Voltage / Current (external Iron Clamp) measurement
Selective Earth
Impedance
Test frequency
Measuring range
Resolution
Uncertainty (* See notes)
Zsel
55 Hz … 329 Hz
0,010
… 1,999
0,001
(8 % of r 3 digits)
2,00
… 19,99
0,01
20,0
… 199,9
0,1
200
… 999
1
1,000 k
… 1,999 k
0,001 k
2,00 k
… 19,99 k
0,01 k
659 Hz … 1,50 kHz
0,00
… 19,99
0,01
(8 % of r 3 digits)
20,0
… 199,9
0,1
200
… 999
1
1,000 k
… 1,999 k
0,001 k
Test mode ...................................................... single or sweep
Open-terminal test voltage ........................... 40 Vac
Test frequency ............................................... 55 Hz, 82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz, 329 Hz,
....................................................................... 659 Hz, 1.31 kHz, 1.50 kHz
Short-circuit test current ............................... > 220 mA @ 164 Hz, 40 Vac
Limit range (Zsel) .......................................... 0,1
… 5 k
(OFF)
Test voltage shape ......................................... sine wave
Zsel definition ................................................ Impedance value Z(f).
Measuring time ............................................. see Table 15.2
Measurement Clamp type ............................ A1018
Automatic test of probe resistance ............... yes
Automatic connection test ........................... yes [H, S, ES, E]
Automatic range selection ............................ yes
Automatic test of voltage noise .................... yes
Low clamp current indication ........................ yes [Ic]
* Notes:
Uncertainty depends of the resistance of probes and auxiliary earth electrodes (See 15.9 Influence
of the auxiliary electrodes).
1
m
resolution
only
for
resistance
of
auxiliary
earth
electrodes
Rc < 300
and test frequency ≤ 329 Hz.
Typical output current ie vs Auxiliary earth probe resistance Rc
2, 3, 4 - pole, Selective (Iron, Flex clamps), Wenner and Schlumberger method
0
50
100
150
200
250
300
1
10
100
1000
10000
Rc [Ω]
ie
[m
A
]
55 Hz
164 Hz
1,31 kHz
3,29 kHz
6,59 kHz
13,1 kHz
15,0 kHz
