Option 4 - Martindale VT12 Voltage & Continuity Tester + PD240 Proving Unit
Option 5 - Martindale TL78 Test Wander Lead (50m)
The Megger MFT1731-OS On-Site takes all the features and specification of the Megger MFT1731 (combined insulation, continuity, loop and RCD tester) but adds on top an Earth Spike Test Kit and also Megger’s PowerSuite software.
This gives you a complete package for installation testing and certification. Certificates can be created and completed on a laptop or PC using the PowerSuite software which works across a wide range of platforms (including Windows). Multiple certificates are supported.
The MFT1731 On-Site can be used in a number of ways:
Directly from the tester
Results can be stored on the tester and downloaded later to a PC
Several Users can complete different parts for large installs and test results can be combined into a single completed certificate. All done at the time of testing.
Multiple Users can complete the same certificate at different times using different testers.
Process for completing a certificate as follows:
Take your measurement with the MFT1731
Either store the result for download later, or output the result directly while on-site using the Bluetooth technology.
After completing testing on a system, all test results on the tester can be downloaded into PowerSuite and then generate the relevant certificate.
The advantage to doing it this way is that all other data for the system can also be stored with the results (e.g. customer name, site address, circuit descriptions and earthing arrangements with no need for paper records).
The MFT1731 is equipped with earth spike resistance ranges for measuring the resistance of a fixed earth spike using a 3 terminal technique and temporary test spikes. The MFT1731 On-Site package also includes 2x test spikes and 3x extended test leads as part of the Earth Spike Test Kit that is included.
Voltage display: ±3% ±3 digits ±0.5% of rated voltage
Max service error: ±15% ±2 digits.
Short circuit current: 1.5 mA nominal test current
Test current on load: ≥1 mA at min. pass values of insulation
Output voltage tolerance: -0% +20% at rated load or less
Continuity / Resistance:
Intrinsic accuracy: ±2% ±2 digits (0.01 Ω to 99.9 Ω), ±5% ±2 digits (100 Ω to 99.9 kΩ)
EN61557 range: 0.1 Ω to 99.9 kΩ
Open circuit voltage 5 V ±1 V
Test current at 200 mA (0 Ω to 2 Ω): >200 mA @ ≤2 Ω
Test current at 15 mA (0 Ω to 2 Ω): >15mA @ ≤2 Ω
Max Service error: ±12% ±2 digits.
Loop test 2Hi (L-PE, L-N, L-L):
Intrinsic accuracy: ±5% ±3 digits
Display range: 0.01 Ω to 1000 Ω
Supply: 48 V to 480 V* (45 Hz to 65 Hz)
Test current high: 4.0 A (at 230 V)
PSCC range: 20 kA
EN61557 range: 0.30 Ω to 1000 Ω
Max service error: ±10% ±2 digits
Loop test 3Lo, 2Lo (L-E):
Intrinsic accuracy: 0.01 Ω to 39.9 Ω ±5% ±5 digits
40.0 Ω to 999 Ω ±10% ±5 digits
Display range: 0.01 Ω to 1000 Ω
Supply: 48 V to 280 V (45 Hz to 65 Hz)
Test current: Pulsed
PFC range: 20 kA
EN61557 range: 1.0 Ω to 1000 Ω
Max service error: ±10% ±2 digits
RCD test:
Intrinsic current accuracy:
No trip test: (1/2xI) –10% to 0%
Trip test: (1xI, 2xI and 5xI) +0% to +10%.
Ramp test current: ±5% ±1 digit
Trip time: ±1% ±1 ms
Programmable step increments: 10 mA to 50 mA - 1 mA steps, 50 mA to 500 mA - 5 mA steps, 500 mA to 1000 mA - 10 mA steps.
Supply: 48 V - 280 V 45 Hz to 65 Hz
Max service error: ±10% ±2 digits
Voltage:
Intrinsic accuracy: ±2% ±1 V
EN61557-1 Range: 10 V to 600 V
Phase rotation indication.
Max service error: ±5% ±2 digits
Frequency:
Intrinsic accuracy: ±0.5% ±2 digits
Resolution: 0.1 Hz
EN61557 Range: 15 Hz to 400 Hz
Max service error: ±5% ±3 digits
Earth Test Ranges:
Intrinsic accuracy: ±2.0% ±3 digits
ART method ±5.0% ±3 digits
Stakeless method ±7.0% ±3 digits
Resolution: 0.01 Ω
EN61557 range: 1.0 Ω to 1.99 kΩ
Current: 0.45 mA or 4.5 mA.
Noise rejection: 20 V pk/pk (7 V rms)
Max probe resistances: Rp, Rc = 100 kΩ @ 50 V
Max service error: ±20% ±3 digits
Current (via Clamp meter):
Intrinsic accuracy: ±5.0% ±3 digits
Resolution: 0.1 mA
EN61557 Range: 0.5 mA – 199 A
Max service error: ±10% ±2 digits
mV Sensor input
Including temperature (third party module)
±1.0% ±2 digits
Range 0.0 mV to ±199.9 mV dc
Resolution 0.1 mV
Internal memory
Capacity 1000 results
Bluetooth® communication
Power consumption:
Nominal minimum: 60 mA (Voltage range with no input voltage)
Nominal maximum: 350 mA (Active Insulation test set to 1000 V / 1 MΩ)
Range: -20 °C to +55 °C
Temperature (via 3rd Party Module):
Intrinsic accuracy: ±1.0% ±2 digits
Resolution: 1 °C
Range: -20 °C to +100 °C
Environmental Specification
Temperature
Operational range: -10 °C to +55 °C
Storage range: -25 °C to +70 °C
Humidity
Operating humidity: 90% R.H. at +40 °C max.
Altitude
2000 m to full safety specification.
Weight: 1000 g ±10% including batteries but excluding test leads, accessories and carry case.
Dimensions: 150 mm high x 85 mm wide x 235 mm deep (6 in. x 3.5 in. x 9.5 in.)
IP rating: IP54
Power Supply
Battery: Primary 6 x 1,5 V cells IEC LR6 type (AA alkaline,).
Battery: Rechargeable: 6 x 1.2 VNiMH cells EC HR6.
Display shows rechargeable [NiMH] when the battery type is changed in setup option (Section 10).
Safety / EMC
EMC In accordance with IEC61326 edition 2.
Locations: Class B locations.
Safety in accordance with BS EN 61010 -1 2010 + 61010 -30:2010
Installation Category: 600 V CAT III / 300 V CAT IV. (Max Phase to Phase 550 V)
In addition switch probe and test leads are designed to meet IEC 1010-031:2008, Double insulated to Installation Category III, 300 V phase to earth, 500 V phase to phase.
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
