Contents
1 Functions and accuracy ......................................................................................... 2
2 What’s in the box? ................................................................................................. 3
3 Measuring reference values for ongoing accuracy records ...................................... 3
4 Checking Continuity performance .......................................................................... 4
4.1 The need to null test leads ........................................................................ 4
4.2 Instruments with a lead null function .......................................................... 4
4.2.1 Lead nulling ............................................................................. 4
4.2.2 Continuity check ....................................................................... 4
4.3 Instruments without a lead null function ...................................................... 5
4.3.1 Measuring lead resistance ......................................................... 5
4.3.2 Continuity check ....................................................................... 5
4.4 Tolerance examples ................................................................................. 5
5 Insulation Resistance checks ................................................................................. 6
6 Earth Fault Loop Impedance checks ...................................................................... 7
7 Residual Current Device checks ............................................................................. 9
1 Functions & accuracy
The Kewtech FC2000 provides a quick and simple method of checking the accuracy of
electrical installation test instruments.
It does not replace the calibration requirements but provides a ready check on instrument
accuracy helping to minimise incorrect certification and costly revisits to confirm installation
compliance.
The FC2000 provides accuracy checks for test instruments used to measure:
• Continuity
• Insulation Resistance
• Earth fault loop impedance
• Operation of Residual Current Devices.
Accuracy
2 What’s in the box?
1 × FC2000
1 × Power Lead
2 × Test leads for Continuity and Insulation Resistance checks
Calibration Certificate
The FC2000 is supplied with a Calibration Certificate. The measured values given on the
Check Label fitted in the lid and shown on the Calibration certificate are the actual resistance
values for each individual FC2000. These values may vary from the Nominal Value due to the
manufacturer’s tolerances for the resistors used.
3 Measuring reference values for ongoing accuracy
records
The FC2000 is supplied with a Calibration Certificate. The measured values given on the
Check Label fitted in the lid are the ‘actual’ resistance values for each individual FC2000.
These values may vary from the Nominal Value due to the manufacturer’s tolerances for the
resistors used.
When using the FC2000 for the first time each test instrument to be checked should be in
current calibration.
When the first set of tests for any instrument are undertaken:
• A separate test record sheet should be kept for each test instrument.
• Each test should be repeated 3 times to establish the initial test value for each particular
instrument.
• The value obtained over the three tests should be similar and within the instrument
manufacturer’s tolerances.
• The average value over the three tests should be recorded on the instrument test record
as the Reference Value.
• It is this Reference Value which will be used for future accuracy checks on the instrument.
Insulation Test
0.5MΩ
1 %
Voltage Rating to
1000V.
2.0MΩ
1%
200MΩ
2%
Continuity Test
0.5Ω
1% ± 20mΩ
Current Rating
1.0Ω
2.0Ω
Loop Test
additional 1Ω or
100Ω switched in to
the Earth Loop
1% ± 20mΩ
Current Rating (pulsed)
RCD
x 1
Current 1% of
range
Timer ± 1ms
x 5
Check Value
Acceptable range
Rating
30mA x 1 (30mA)
30 to 33mA
30mA AC type
30mA x 5 (150mA)
143 to 165mA
30mA AC type
30mA x 1/2 (15mA)
13.5 to 15mA
30mA AC type
