MIT-4500 series
MIT-4500 Series High Voltage Insulation Resistance Tester
5, 10 or 15 kV · from 0.01 MΩ to 50 TΩ · six rated levels plus steps
Insulation testing for transformers, motors, generators, cables and switchgear. Three models at 5, 10 and 15 kV, each with six rated voltage levels and a step adjustment function for the voltages in between.
MIT-4500 series · 240 × 188 × 85 mm, 2720 g
Six levels, or anything in between
Fixed steps rarely match every specification. A step adjustment function sits on top of the six rated levels, so a voltage the fixed steps do not reach is still available.
Six levels plus steps
Each model offers six rated test voltages, and a step adjustment function produces the levels in between, up to that model’s maximum. A 15 kV instrument will also generate 12 kV.
Five measurements
Insulation from 0.01 MΩ, DC to 1000 V, AC to 750 V, DC current from 0.01 nA and capacitance to 50 µF, all on the same terminals.
Ratios calculated for you
Absorption ratio and polarization index come off the display, worked out from the timed readings rather than a stopwatch and a calculator.
500 sets, USB to the PC
Held internally and reviewed on the instrument, then uploaded to the supplied software for saving, reporting and printing.
Discharge and alarm
The test object is discharged automatically at the end of a test, an alarm is raised when a reading passes a set threshold, and the instrument shuts itself down.
Built for the test point
IP54 against dust and moisture, running from an 11.1 V internal pack, so there is no mains connection to find on site.
Used on transformer windings, bushings and surge arresters, on motor and generator windings assessed by absorption ratio and polarization index, and on cables and lines where distributed capacitance is high.
Three models, and they do not nest
The rated voltage sets overlap, but each model drops the lowest level as it gains the highest. The 15 kV instrument does not offer 100 V or 250 V, so the top model is not automatically the safe choice.
| Model | Rated test voltages | Insulation range | Part number |
|---|---|---|---|
| MIT-4505 | 100, 250, 500, 1000, 2500 V, 5 kV | 0.01 MΩ to 10 TΩ | 464505 |
| MIT-4510 | 250, 500, 1000, 2500 V, 5 kV, 10 kV | 0.01 MΩ to 35 TΩ | 474510 |
| MIT-4515 | 500, 1000, 2500 V, 5 kV, 10 kV, 15 kV | 0.01 MΩ to 50 TΩ | 484515 |
Test voltage is the rated value × (1 ±10%), and output short-circuit current is 6 mA or better on all three. Check the lowest voltage your specification calls for as well as the highest: the step adjustment function reaches intermediate levels, but not below a model’s lowest rated one.
Measurement ranges and accuracy
Five measurements from one set of terminals, with resolution and accuracy the same across the three models.
| Measurement | Range | Resolution | Accuracy |
|---|---|---|---|
| Insulation and leakage | |||
| Insulation resistance | 0.01 MΩ to 50 TΩ, by model | 0.01 MΩ | ±(3% rdg + 5 digits) |
| DC current | 0.01 nA to 6 mA | 0.01 nA | ±(5.0% rdg + 2 digits) |
| Capacitance | 10 nF to 50 µF | 10 nF | ±(10% rdg + 5 digits) |
| Voltage | |||
| DC voltage | 0.1 to 1000 V | 0.1 V | ±(1.5% rdg + 3 digits) |
| AC voltage | 0.1 to 750 V | 0.1 V | ±(1.5% rdg + 3 digits) |
| Output | |||
| Test voltage | Rated value × (1 ±10%) | — | — |
| Output short-circuit current | 6 mA or better | — | — |
Accuracies are quoted at 23 ±5 °C and below 75% relative humidity. Absorption ratio and polarization index are calculated from the timed readings rather than measured separately. Resolution, accuracy and output short-circuit current are the same across all three models.
High voltage instrument
These testers generate up to 15 kV. They are for use by trained personnel following the appropriate safe system of work, with the test object isolated and proved dead before connection. The voltage inputs are rated CAT III 300 V.
Compliance: IEC 61010-1, IEC 61010-2-031, IEC 61557-1 and 61557-5, IEC 60529 to IP54, at pollution degree 2. Reference conditions 23 ±5 °C below 75% relative humidity.
Technical specifications
| Measures | Insulation resistance, DC and AC voltage, DC current and capacitance · absorption ratio and polarization index calculated automatically |
|---|---|
| Voltage levels | Six rated levels per model, plus a step adjustment function that produces intermediate voltages, so a 15 kV instrument will also generate 12 kV |
| Display | Four-digit backlit LCD with controllable brightness, for use in dim places |
| Storage and output | 500 sets held internally with review on the instrument · USB to the supplied monitoring software for upload, saving and printing |
| Alarm and discharge | Alarm raised when a reading passes the set threshold · automatic discharge at the end of a test · automatic shutdown |
| Interference | Large output power and strong interference rejection, for stable readings in substations and on long cables where distributed capacitance is high |
| Power | 11.1 V internal rechargeable battery with charger · no mains connection needed at the test point |
| Construction | Shock, dust and moisture resistant · IP54 to IEC 60529 · pollution degree 2 |
| Standards | IEC 61010-1 · IEC 61010-2-031 · IEC 61557-1 and 61557-5 · IEC 60529 (IP54) |
| Measurement category | CAT III 300 V · pollution degree 2 |
| Reference conditions | 23 ±5 °C, below 75% relative humidity |
| Dimensions · mass | 240 × 188 × 85 mm · 2720 g including battery |
| Part numbers | MIT-4505 464505 · MIT-4510 474510 · MIT-4515 484515 |
What’s in the case
- MIT-4505, MIT-4510 or MIT-4515 tester
- High voltage rod, red, 3 m
- High voltage test leads, black and green, 1.5 m each
- Battery charger for the internal 11.1 V pack
- USB cable and monitoring software on CD
- Accessory case, manual and warranty certificate
The rod and both leads are supplied as standard. Lead lengths may vary by configuration. 500 sets are held internally and upload over USB for the report.