2
Contents
X.1 SAFETY WARNINGS 4
1. Introduction 5
2. Overview 6
2.1 Front panel and controls 6
2.2 Waste electrical and electronic equipment 9
2.3 Battery and Fuse Location, fitting and replacement 9
3. Operation 10
3.1 General operation – all models 10
3.2 Mode button functions 11
3.3 Test inhibit 12
4. Voltage, Frequency, Current and temperature measurement 13
4.1 Making a voltage measurement 13
5. Continuity / resistance measurement 15
5.1 Nulling test lead resistance (up to 9.99ohms)
W
16
5.2 Making a CONTINUITY measurement 17
5.3 Storing / downloading results (MFT1835 only) 17
5.4 Continuity Buzzer ON/OFF 17
5.5 Switch probe (SP5) 18
5.6 Buzzer threshold 18
5.7 Measurement methods and sources of error 18
6. Insulation resistance
500
V
19
6.1 Making an INSULATION measurement 19
6.2 Insulation test lock 19
6.3 Measurement methods and sources of error 20
7. Loop Impedance testing 21
7.1 Range selection and test leads 21
7.2 MAKING A LOOP IMPEDANCE MEASUREMENT 23
7.3 Phase to Neutral (or Phase to Phase) testing 28
7.4 Prospective Fault Current and Short Circuit calculation (PFC & PSCC) 29
7.5 Measurement methods and sources of error 30
8. Residual Current Device testing 31
8.1 MAKING AN RCD MEASUREMENT 32
8.2 Selecting RCD type 32
8.3 ½ x I RCD Current Rating (No-trip test)
32
8.4 1 x I RCD Current Rating (Tripping test on 30mA RCD) 34
8.5 2 x I RCD Current Rating (Tripping test on 30mA RCD) – MFT1825 & 1835 ONLY 35
8.6 5 x I RCD Current Rating (Tripping test on 30mA RCD) 35
8.7 Ramp Test 36
8.8 Fast Ramp Test 37
8.9 Type A (DC Sensitive) RCD test
37
8.10 Type B (Pure DC) RCD test 37
8.11 Variable RCDs (not MFT1815) 38
8.12 AUTO RCD testing 38
8.13 3 Phase RCD testing 39
8.14 Touch voltage display 39
8.15 Measurement methods and sources of error 40
8.16 Useful information 41
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