37
Defi nition of an absolute error of the cable insulation fault location
Connect the hookup for the calibration as on the
fi
gure. Resistance boxes M1 and M2
must be 0
÷
1kOm, M3 0
÷
3 MOhm. Set the resistances from the table on the boxes
M1, M2, M3.
The tolerated error of measurement of an insulation fault location of the cable:
M1
Ohm
M2
Ohm
Loop
Ohm
Tolerated absolute error for
M3 = 0, 1, 2, 3 MOhm
100
0
100
0,2 %
50
50
100
0,3 %
500
0
500
0,2 %
250
250
500
0,3 %
1000
0
1000
0,2 %
500
500
1000
0,3 %
Switch the device in LOOP mode after each setting, measure a loop pressing the
[OK] key. After that, switch the device to LEAKAGE mode, press [OK] and read the
indications Xmsd.
For each value on the resistance box you must make not less than 3 measurements. To repeat,
press [OK]. The absolute error of measurement
Δ
3 is de
fi
ned from equation:
Δ
3=Xmsd-X0
where Xmsd – the average of indications, X0 – the value from the table.
The accepted error
Δ
3 must be not more than tolerated error on the table.
Defi nition of an absolute error of a cable capacity measurement
Switch the devise in to CAPACITY mode. Changing of B-C.
Connect the measuring wires B and C to capacitance box with range of 0
÷
2mkF with
the accuracy of 0,1nF.
Set up 1, 10, 100, 500, 750nF, 1, 1.5, 1.9 mkF by turns on the capacitance box.
After each setting make a measurement pressing the [OK] key and
fi
x the result.
For each value on the resistance box you must make not less than 3 measurements
The absolute error of measurement
Δ
4 is de
fi
ned from equation:
Δ
4=Amsd-A0
Where Amsd is the average of indications, A0 is the value from the capacitance box.
