Megger MFT1700 series - Instrument Operation; General Operation Procedures; Test Inhibit Conditions

Loop impedance testing [mA] – Measures circuit loop
impedance
Note: Third lead can be connected. The third lead will enable reverse
polarity detection
MEASUREMENT: Press TEST to start. L-E tests start automatically.
Supply: L-E = 50 Vac - 280 Vac
L-L, L-N = 50 Vac – 480 Vac
Zmax:
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Stores maximum loop measurements on small
display and most recent loop measurement on
larger display
Warnings: Over voltage
Reverse polarity (with mains plug test lead)
SETUP options: Auto start on connection ON/OFF
Note: Third lead can be connected. The third lead will enable polarity
detection.
Loop impedance R1+R2 testing [mA]
MEASUREMENT: Select Zref and make measurement at Ze (or Zdb).
This is automatically saved.
Zref & R1+R2 Select R1+R2 mode and make measurement as
normal (Zs).
Zref automatically deducted from Loop (Zs) value
to give R1+R2 value.
Main
range
knob
(left)
2nd Range
knob
(right)
Terminal
connections
Separate
leads
Mains lead
connections
User
Action
NOT 1710
See note
See note See note
NONE
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Main
range
knob
(left)
2nd Range
knob
(right
Terminal
connections
Separate
leads
Mains lead
connections
User
Action
then
See note
See note See note
NONE
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