< Back to Measuring Equipment

505 High Voltage Insulation Tester

Measuring Ranges
Nominal/Open Circuit Voltage Measuring Range Nominal Current Short Circuit Current Intrinsic Error (1)
100V 250V 500V 1000V 100V/1500V 250V/2000V 500V/2500V 1000V/5000V 100K to 100M 10K to 1T 1 mA 0.7 mA 0.5 mA 0.4 mA 0.1 mA 1.3 mA 1.3 mA 2.5% 5%

Direct and Alternating Voltage
Measuring Range Frequency Internal Resistance Maximum Overload Intrinsic Error (1)
0 to 2000V AC/DC 15Hz to 500Hz 5M 2200V AC/DC max. 10s 5%


Reference Conditions
Ambient Temperature: 73F (23C) 4F (2C)
Relative Humidity: 45 to 55%
Measurement Magnitude Frequency: 60Hz (voltage measurements)
Line Voltage Waveform: Sine, deviation between effective and rectified value 1%
Battery Voltage: 8V 1%
Operating Position: Horizontal
Electromagnetic Compatibility EMC
Interference Emission: EN 50081-1: 1992
Interference Immunity: EN 50082-1: 1992

Electrical Safety
Protection Class: II
Test Voltage: 8.5KV
Overvoltage Classification: II
Pollution Degree: 2
Protection: IP 52
Designed to IEC 1010-1

Measures Insulation Resistances Up To 1 T Ohm

Simpson’s Model 505 High Voltage Insulation Tester is capable of measuring insulation resistances from 10 kilohms to 1 teraohm with eight selectable test voltages up to 5000 V. As a safety feature, the insulation tester acts as an AC/DC voltmeter to measure the absence of voltage in networks up to 2000 V. For added safety, the cables are permanently attached, preventing possible injury that could occur by the accidental removal of the cables. The Model 505 features automatic discharging capability of capacitive units under test and a lock in test switch, for hands free operation. An optional guard terminal is available to minimize surface leakage errors. There are two LEDs to indicate the selected measuring range, and one LED signifying valid measurements and battery charge status. Each tester comes in a padded carrying case with permanently connected cables and test probes, 2 alligator clips and a plug-in battery module with batteries.

Eight Test Voltages: 100, 250, 500, 1000, 1500, 2000, 2500, and 5000 VDC High Sensitivity, Direct Resistance Reading to 1T (1,000,000M) no Multipliers
Voltage Measurement to 2000 V AC/DC
Battery Powered
Built in Battery Test and Battery Charge Indicator

Ambient Conditions
Operating Temp. Range: 32F (OC) to 104F (40C)
Storage Temp. Range: -4F (-20C) to 140F (60C) (without batteries)
Relative Humidity: max. 75%, condensation must be avoided
Batteries: 6 ea. 1.5V “D” size batteries
Working Range: 6 to 10V
Battery Service Life: 100 hours for no-load and intermittent operation, 7500 measurements for test voltage of 1000V with measure resistance of 1M, 15,000 measurements for test voltage of 500V with measure resistance of 500KV, measurement of 5sec.- pause 25sec.

Mechanical Design
Dimensions: W 11.41” (290mm) x D 9.8” (250mm) x H 5.5” (140mm)
Weight: Approx. 7.5 lbs. (with batteries)

Specifications subject to change without notice.

Accessories Catalog Number Accessories Catalog Number Accessories Catalog Number
505 High-Voltage Insulation Tester 12505 Guard Cable with Alligator Clip 45065 Replacement Alligator Clips (pair) 45066

< Back to Measuring Equipment