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IRT3 • Insulation Resistance Tester

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The IRT3 is an affordable, rugged Megohmeter

used to check motor and generator windings,

power transformers, and electrical lines. Its

multiple output ranges make it suitable for a wide

variety of applications.

The IRT3

has the following features:

• Large high-contrast analog display

• Live circuit (external voltage applied) warning light

• AC Voltage measurement to 600 Volts

• Insulation resistance readings from 0 to 400 Megohms

• Three test-voltage ranges (250, 500, 1000 V DC)

• Fuse protected against accidental misuse

• Precision, low resistance test leads (1000 Volt CAT III rated)

• Low battery indication

• Maintains rated voltage on cables at up to 1 mA leak-rate

• Automatic, post-test cable discharge

• Rugged, compact case with latching cover to keep the elements out

• Three year limited warranty

Standard Accessories:

Test Leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 pair

Batteries 1.5V, “AA” Alkaline (R6) . . . . . . . . . . . . . . . . . .8 pieces

Fuse 0.5A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 piece

Instruction Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 booklet

Alligator Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 set

Hard Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 piece

Specifications

Insulation Resistance

Range Accuracy

0 - 50MΩ & ∞ (250 DC V ±10%) ±5% rdg (approx)

0 - 100MΩ & ∞ (500 DC V ±10%)

0 - 400MΩ & ∞ (1000 DC V ±10%)

Open circuit current: 1mA DC min @ 0.25MΩ for 250V range

1mA DC min @ 0.5MΩ for 500V range

1mA DC min @ 1MΩ for 1000mA

Short circuit current: 0 - 50MΩ : 2 DCmA

0 - 100MΩ : 2 DCmA

0 - 400MΩ : 2 DCmA

Power consumption: Max current approximately 190mA @ 12 V DC

Function Range Accuracy Frequency Range

AC Voltage 0 - 600V ±2.5% ±3 dgt 40 - 1kHz

Continuity 0 - 50Ω ±2.5% Full Scale

Open Circuit terminal voltage: 4V DC min.

Short Circuit terminal current: 240mA DC min.

Safety requirements: IEC-1010 safety requirements category III

Dimensions: 6.7 x 6.5 x 3.6 inches (170 x 165 x 92 mm)

Weight: 2.1 lb. (batteries included)

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