MI 3290 Earth Analyser
Technical specifications
131
15.1.6 Selective (Flex Clamps 1 - 4)
Measurement principle: ............................... Voltage / Current (external Flex Clamp) measurement
Total Earth
Impedance
Test frequency
Measuring range
Resolution
Uncertainty (* See notes)
Ztot
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 … 2,63 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
3,29 kHz … 6,59 kHz
0,00
… 19,99
0,01
(10 % of r 3 digits)
20,0
… 199,9
0,1
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, 2.63 kHz, 3.29 kHz, 6.59 kHz
Short-circuit test current ............................... > 220 mA @ 164 Hz, 40 Vac
Limit range (Ztot) .......................................... 0,1
… 5 k
(OFF)
Test voltage shape ......................................... sine wave
Ztot definition ................................................ Impedance value Z(f)
Measuring time ............................................. see Table 15.2
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 [If1, If2, If3, If4]
Automatic clamp recognition ....................... yes [F1, F2, F3, F4]
* 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 Measuring time Measurement
Test frequency
2 – pole
3 – pole
4 – pole
Selective (Iron Clamp)
Selective (Flex Clamp 1-4)
55 Hz
17 s
32 s
45 s
57 s
1:13 s
329 Hz
8 s
11 s
15 s
19 s
23 s
1.50 kHz
6 s
10 s
12 s
15 s
18 s
6.59 kHz
6 s
9 s
12 s
/
18 s
15.0 kHz
6 s
9 s
11 s
/
/
sweep
1:14 s
2:17 s
3:20 s
3:35 s
5:30 s (1 x Flex Clamp)
Table 15.2: Typical measuring times for different measurements
