Megger MFT70 : Multifunction Tester

This instrument is IEC 61010 CAT IV 300 V rated for connection to low voltage systems with no protective device, so it is safe for connection anywhere on the system up to the source transformer without risk of damage from large transient spikes.

The unique modern styling allows it to be operated while standing on the floor, a ladder-shelf or platform, hung around the neck or handheld. Dual TEST and LOCK buttons – one pair at each end – make the tester easy to operate with either the left or right hand.

Easy to pick up and use, the rotary controls are color coded to make range selection fast. They also reduce the chance of using the wrong function or range. The large crystal clear backlit display uses the patented Megger digital/analog arc, providing an indication of fluctuating readings. The dual digital readout shows precise values of key measurements and the test parameters simultaneously, such as the output voltage on insulation testing as well as the resistance value in MΩ.

Visible and audible safety warnings are paramount when testing highenergy systems, and the MFT70 includes full input protection and safety warnings when a hazardous voltage is present. If live voltages exist on a circuit during insulation or continuity testing, the voltage is displayed on the screen. If this voltage exceeds a safe level, further testing is inhibited and a warning beep sounds.

The MFT70 features internally rechargeable batteries with a charge time of less than 4 hours, which reduces the cost of ownership.

Fully compliant with all requirements of IEC60364 derived standards, MFT70 includes all the latest measurement technology in a compact design and is fully protected and usable on single phase  three phase installations.

The MFT70 combines quick continuity resistance with a number of insulation resistance tests as well as testing of GFCIs, alleviating the need for multiple separate function test instruments.

The unit includes built in memory and Bluetooth® communications for downloading of memory using Megger Download Manager (supplied) for simple form filling of test results.

The MFT70 is designed for tough environments and ultimate reliability. Features include a rubber over mold for extra protection and grip, IP54 protection against dust and water and an IEC61010 CAT IV safety rating. Its class leading input protection ensures the MFT70 can withstand accidental misuse and voltage transients when other testers can’t.

All this in an intuitive and easy to use instrument with no hidden menus or complicated screens. Tests are easily selected using the color coded rotary switches with results clearly displayed on the high contrast dual measurement backlit display.

 

SPECIFICATIONS:

• Insulation test
  Output voltage                 -0% +20% at rated load or less
  Voltage display                ±3% ±3 digits ±0.5% of rated voltage
  Short circuit current         1.5 mA nominal test current
  Test current on load         1 mA at min pass values of insulation

• Measurement accuracy
  1000 Volts                       10 kΩ – 999 MΩ         ±3% ±2 digits
  500 Volts                         10 kΩ – 500 MΩ         ±3% ±2 digits
                                          >500 MΩ                   ±10% ±4 digits
  250 Volts                        10 kΩ – 250 MΩ          ±3% ±2 digits
                                          >250 MΩ                   ±10% ±4 digits
  100 Volts                        10 kΩ – 100 MΩ          ±3% ±2 digits
                                          >100 MΩ ±10%         ±4 digits

• Resistance and continuity
                                          0.01 Ω – 99.9 Ω         ±2% ±2 digits
                                         100 Ω – 99.9 kΩ         ±5% ±2 digits
  Open circuit voltage        5 V ±1 V
  Test current                    (0 Ω – 2 Ω)
                                         205 mA ±5 mA
                                         15 mA ±5 mA
                                         (user selectable)

• GFCI Test
  Intrinsic current accuracy:
  Ramp test current: ±5% ±1 digit
  Supply: 48 V – 280 V 45 Hz to 65 Hz
  Max service error: ±10% ±2 digits

• Supply measurement
  Voltage                           10 V – 600 V
                                         (15 – 400 Hz) True RMS
                                          ±3% ± 1 V ±2 digits
  Phase rotation indication
                                          L1–L2–L3 and L1–L3–L2
  Frequency                      15 Hz – 99 Hz ±0.5% ±1 digit
                                         100 Hz – 400 Hz ±2.0% ±2 digits
  Frequency resolution      0.1 Hz

• Power supply
  Charger for on-board recharging (4 hours typical)
  12 V car charger (cigarette lighter lead – optional)

• Ground test
  Resolution                      0.01 Ω
  Current                           0.45 mA or 4.5 mA
  Noise rejection               20 V pk/pk (7 V rms)
  Max probe resistances   Rp and Rc
                                         100 kΩ @ 50 V
                                          5 kΩ @ 25 V
  2 and 3 pole method      (0.01 Ω – 1.999 kΩ)
                                         ±2.0% ±3 digits
  ART method                   (1.00 Ω – 1.999 kΩ) ±5.0% ±3 digits*
  Stakeless method           (1.00 Ω – 199 Ω) ±7.0% ±3 digits*