METREL MI 3290 - Clamps; Passive (Flex Clamps 1-4)

MI 3290 Earth Analyser Technical specifications
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15.1.3 2 Clamps
Measurement principle: ............................... Measurement of resistance in closed loops using
two iron current clamps
Loop Impedance
Measuring range
Resolution
Uncertainty
Ze
0,00  … 9,99 
0,01 
(5 % of reading + 2 digits)
10,0  … 49,9 
0,1 
(10 % of reading + 2 digits)
50  … 100 
1 
(20 % of reading)
Test mode ...................................................... continuous
Distance between test clamps ...................... > 30 cm (min)
Test frequency ............................................... 82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz, 329 Hz
Limit range (Ze) ............................................. 0,1  … 40  (OFF)
Test voltage shape ......................................... sine wave
Ze definition .................................................. Impedance value Z(f).
Measuring refresh rate .................................. typical 3 s at 164 Hz (depending on test frequency)
Measurement Clamp type ............................ A1018
Generator Clamp type .................................. A1019
Automatic range selection ............................ yes
Automatic test of voltage noise .................... yes
Low clamp current indication ........................ yes [Ic]
Typical loop (test) current
Loop Impedances
Test frequency
10 m
100 m
500 m
1 
5 
10 
164 Hz
6,8 A
0,36 A
80 mA
40 mA
8 mA
4 mA
Table 15.1: Typical loop (test) current for different loop impedances
15.1.4 Passive (Flex Clamps 1-4)
Measurement principle: ............................... Voltage / Current (external Flex Clamp) measurement
Total Earth Impedance
Measuring range
Resolution
Uncertainty
Ztot
0,00  … 19,99 
0,01 
(8 % of reading + 3 digits)
20,0  … 199,9 
0,1 
200  … 999 
1 
1,000  … 1,999 
0,001 k
2,00 k … 19,99 k
0,01 k
Test mode ...................................................... continuous
Nominal frequency ........................................ 45 Hz … 150 Hz
Limit range (Zsel) .......................................... 0,1  … 5 k (OFF)
Ztot definition ................................................ Impedance value Z(f).
Measuring refresh rate .................................. typical 6 s
Input resistance (S) ....................................... 1,2 M
Automatic connection test ........................... yes [S]
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]