MIT2500
CAT IV Insulation testers
■ Insulation testing up to 2.5 kV (New)
and 200 GΩ range in a hand held instrument
■ Guard terminal for high resistance accuracy
(New)
■ Adjustable insulation test voltage from
50 V to 2500 V (New)
■ Stabilised insulation test voltage (New)
■ Rechargeable options for mains and car
charging (New)
■ Single range, faster continuity testing from
0.01 Ω to 1 MΩ (New)
■ Polarisation Index (PI) & Dielectric Absorption
Ratio (DAR)
■ CAT IV 600 V applications
DESCRIPTION
The MIT2500 insulation and continuity tester has been designed for
Electrical and Industrial test applications, where operation voltages
exceed 1000 V and higher insulation test voltages are needed.
The MIT2500 offers both fixed range voltages of 50 V, 100V,
250 V, 500 V, 1000 V and 2500 V, as well as a variable range that
allows any voltage between 50 V and 2500 V to be “dialled in”.
This is supported by the new test voltage feedback control, which
maintains the output test voltage to within 2% of the selected
range, even when under test.
The MIT2500 uses the redesigned case, back-stand, and 6 cell
battery compartment, as well as incorporating a Guard terminal
to reduce surface tracking currents that reduce accuracy at higher
voltages.
All instruments are over-moulded for increased protection and
achieve an IP54 weatherproof rating
INSULATION RESISTANCE TESTING
The feedback controlled insulation test voltage is now accurate
to +2% -0% compared to the original +20%, providing a more
accurate test voltage without the risk of over-voltage damage to
circuits.
A variable range allows the exact test voltage to be selected from
50 V to 999 V in 1 V steps, (1KV to 2.5KV in 10 V steps) providing
1100 test voltage options.
FEATURES INCLUDE:
■ Test voltages (New)
- 50 V, 100 V, 250 V, 500 V, 1000 V, and 2500 V
■ Guard terminal
- Improved performance on higher insulation test ranges
■ 2.5 kV Silicone test leads (New)
- Purpose designed high 2.5 kV silicone test leads are included as
well as standard 1000 V CAT III / 600 V CAT IV general purpose
test leads.
■ Variable test voltage (New)
- Adjustable test voltage from 50 V to 999 V in 1 V steps,
1000 V to 2500 V in 10 V steps
■ 2% Test voltage accuracy
- The output test voltage is maintained within the tolerance of
-0% +2% +2 V
■ Stabilised test voltage
- The voltage is feedback controlled to ensure it remains within
specification throughout the full test range
■ Test voltage display (New)
- The actual test voltage is displayed on the smaller digital
readout, with the measurement on the larger digital display.
■ Measurement range displayed
– The range voltage is displayed during selection.
■ Measurement voltage display (New)
- The measurement voltage is displayed during the test.
■ Analogue arc
- The display also features an analogue arc to replicate the
response of a moving coil display.
■ PI and DAR
- Automatic Polarisation Index (PI) and Dielectric Absorption Ratio
(DAR) functions. Polarisation Index (PI):10 min / 1 minute ratio
Dielectric Absorption Ratio (DAR): 60 sec / 30 sec ratio
■ Timed testing
- Automatically test to a time limit.
■ 200 GΩ range
- Insulation testing up to 200 GΩ at ≥1000 V.
■ Test inhibit
- prevents testing if voltages in excess of 25, 30, 50, 75 or 100 V
(set by the user) are detected when making insulation tests.
Default is 50 V.
■ Insulation buzzer
- The buzzer can be set to sound if the insulation resistance is
above a user adjustable limit, configurable in the Setup menu.
■ Test Lock
- Holds insulation test on continuously.
Test ranges extend from 10 GΩ to 200 GΩ depending on test
voltage as below:
■50 Volts 10 GΩ
■100 Volts 20 GΩ
■250 Volts 50 GΩ
■500 Volts 100 GΩ
■1000 Volts 200 GΩ
■2500 Volts 200 GΩ
The MIT2500 also includes a Guard terminal to prevent errors from
stray leakage paths.
VARIABLE INSULATION VOLTAGE (NEW)*
The variable mode provides a unique solution for awkward
insulation voltage measurement applications. The range option
allows an insulation test voltage from 50 V to 999 V in 1 V steps,
1.0 KV to 2.5 KV in 10 V steps.
TYPICAL APPLICATIONS INCLUDE
■ Commercial Avionics
■ Military Land, Marine and Air communications
■ Manufacturing/production line goods
■ Electrostatic measurement
■ Component testing
■ Battery powered traction and lifting equipment
GUARD TERMINAL
The Guard terminal (G) is a third terminal on the connection panel.
Connection of the guard terminal on certain applications provides a
return path for parallel leakage currents that could otherwise create
significant errors in the insulation measurement. This is especially so
for surface contamination of equipment or cables.
■ For voltages of 1000 V and above, or expected insulation values
over 100 MΩ the guard terminal should be considered to reduce
measurement error.
CONTINUITY (RESISTANCE) TESTING
■ Single resistance range (New)
- One range fully automatic from 0.01 Ω to 1.0 MΩ.
■ Auto test current selection
- Automatically uses the preferred test current for the load
resistance under test.
■ Bi-directional testing (New)
- Option for automatic bi-directional testing without reconnecting
leads.
■ Fast response time (New)
- Response time on contact buzzer has been reduced
■ 200 mA or 20 mA
- Either 200 mA or 20 mA continuity test currents are available.
20 mA test current will considerably increase battery life.
■ Lead null
- Lead resistance compensation (NULL) operates up to 10 Ω of
resistance.
■ Buzzer - ON/OFF selected by simple push button.
■ Buzzer limit
- Continuity buzzer limit alarm provides adjustment of the
maximum resistance the continuity buzzer sounds. This is
adjustable from 1 Ω to 200 Ω in 12 steps.
■ Display PASS/FAIL (?/?) warnings (New)
- For use where buzzer indication may be disruptive.
VOLTAGE MEASUREMENT
True RMS voltage measurement to 600 V ac or dc with resolution
from 0.1 mV.
■ Digital voltage measurement up to 600 V ac/dc
■ Automatic display of frequency during voltage measurement.
DISPLAY
The display offers a combination of Analogue arc and a dual digital
readout:
Analogue arc:
■ Full display width analogue arc.
■ Arc display shows essential charge and discharge characteristics
not visible on a digital display.
■ Single pointer “needle” response has a similar response to a
moving coil meter.
Dual digital display
■ Large main digital readout for good visibility of all main
measurement results
■ Second digital display for additional data such as:
■ Insulation test voltage.
■ Insulation leakage current.
■ Supply frequency (when measuring volts).
■ Test mode eg. PI, DAR or t (t = Timer mode).
