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Fluke 1535 and 1537 Insulation Resistance Tester and Megohmmeters
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Fast, accurate, reliable insulation testing in a portable, lightweight package

The Fluke 1535 and 1537 2,500 V Insulation Resistance Testers are engineered to simplify frontline troubleshooting whether you’re on the factory floor or working in the field at a solar installation. With user-selectable test voltages from 250 V to 2,500 V and resistance measurements up to 500 GΩ, these testers allow you to cover more workload with a single tool. Equipped with an intuitive user interface, a short circuit current of up to 5 mA and a CAT IV 600 V rating, these portable high-voltage insulation testers can deliver rapid and stable resistance measurements no matter where you take them. The 1537 Insulation Resistance Tester also allows you to store measurements for later review or PC transfer using the provided software.

  • Selectable Voltage Tests: Tailor your tests with user-selectable voltages of 250 V, 500 V, 1000 V, and 2500 V to cover both industrial and solar applications.
  • Extended Insulation Resistance Measurement: Reach up to 500 GΩ in insulation resistance measurement for a thorough analysis.
  • Intelligent Calculations: Automatically calculate the Polarization Index (PI) and Dielectric Absorption Ratio (DAR), minimizing the influence of environmental factors.
  • High Measurement Capacity: Execute up to 1,300 measurements at 2,500 V or 6,500 measurements at 250 V on a single charge, enhancing productivity.
  • Enhanced Safety Features: Benefit from a CAT IV 600V rating and a built-in voltage alarm function for heightened safety during operations.

The Fluke 1537 has these additional features:

  • Extended Measurements: The Fluke 1537 enhances your testing capabilities with AC/DC voltage and resistance measurements.
  • Stable Resistance Measurements: Achieve faster, more stable insulation resistance measurements with a short circuit current up to 5mA.
  • Fine-tunable Test Voltage: Adjust the test voltage from 250 V to 2500 V in 100 V increments to meet specific testing requirements.
  • Dielectric Discharge Rate Calculation: Automatically calculate the dielectric discharge rate (DD) to aid in identifying elusive insulation issues.
  • Ramp Test Mode: Linearly increase the applied test voltage 100 V/s to help identify potentially hard to identify fault conditions.
  • Visual and Audio Continuity Indicator: Verify continuity visually on the screen display or with the audible indicator so you can focus on your testing procedure without looking at the display.
  • Customizable Testing Parameters: Set user-defined labels, adjust test duration, and store measurement results for a tailored testing experience.
  • Effortless Data Management: Download and manage data effortlessly with the provided PC software.
  • Extended Warranty: Enjoy peace of mind with an extended 3-year warranty.
  • User-selectable voltages of 250 V-2500 V
  • Up to 500 GΩ insulation resistance measurement
  • Short circuit current up to 5mA for fast, stable measurements
  • Automatically calculate PI and DAR
  • Perform 1,300+ insulation tests on a single charge
General Specifications
Display 73.5 mm x 104 mm
Battery 8 AA alkaline cells, IEC LR6
Dimensions (H x W x L) 184 mm x 211 mm x 93 mm
Weight 1.3 kg
Temperature
Operating temperature -10 °C to +50 °C
Storage temperature -20 °C to +60 °C
Operating humidity Non-condensing (<10 °C)
≤80 % RH (10 °C to 30 °C)
≤50 % RH (30 °C to 50 °C)
Altitude
Operating altitude 2000 m
Storage altitude 12000 m
Overvoltage category CAT IV 600 V
Safety
General IEC 61010-1, Pollution Degree 2
IEC 61557-1
Measurement IEC 61010-2-030: CAT IV 600 V
IEC 61010-2-034: 2500 V dc
Insulation resistance measurement IEC 61557-1, IEC 61557-2
IP Rating IEC 60529 IP40
Electromagnetic Compatibility (EMC)
International IEC 61326-1: Electromagnetic environment for portable equipments
IEC 61326-2-2 CISPR 11: Group 1, Class A
Electrical Specifications
The meter's accuracy is specified for one year after calibration at operating temperatures of 10°C to 30°C. For operating temperatures outside the range (-10°C to +10°C and +30°C to +50°C), add ± 0.25% per °C, except on the 20% bands, add ± 1% per °C.
Insulation resistance testing
Test voltage Range Resolution Accuracy
250 V <200 kΩ Unspecified Unspecified
200 kΩ to 500 kΩ 1 kΩ 5 %
0.50 MΩ to 5.00 MΩ .01 MΩ 5 %
5.0 MΩ to 50.0 MΩ 0.1 MΩ 5 %
50 MΩ to 500 MΩ 1 MΩ 5 %
0.50 GΩ to 5.00 GΩ 0.01 GΩ 5 %
5.0 GΩ to 50.0 GΩ 0.1 GΩ 20 %
>50 GΩ Unspecified Unspecified
500 V <200 kΩ Unspecified Unspecified
200 kΩ to 500 kΩ 1 kΩ 5 %
0.50 MΩ to 5.00 MΩ .01 MΩ 5 %
5.0 MΩ to 50.0 MΩ 0.1 MΩ 5 %
50 MΩ to 500 MΩ 1 MΩ 5 %
0.50 GΩ to 5.00 GΩ 0.01 GΩ 5 %
5.0 GΩ to 10.0 GΩ 0.1 GΩ 5 %
10.0 GΩ to 50.0 GΩ 0.5 GΩ 20 %
50 GΩ to 100 GΩ 5 GΩ 20 %
>100 GΩ Unspecified Unspecified
1000 V <200 kΩ Unspecified Unspecified
200 kΩ to 500 kΩ 1 kΩ 5 %
0.50 MΩ to 5.00 MΩ .01 MΩ 5 %
5.0 MΩ to 50.0 MΩ 0.1 MΩ 5 %
50 MΩ to 500 MΩ 1 MΩ 5 %
0.50 GΩ to 5.00 GΩ 0.01 GΩ 5 %
5.0 GΩ to 20.0 GΩ 0.1 GΩ 5 %
20.0 GΩ to 50.0 GΩ 0.5 GΩ 20 %
50 GΩ to 200 GΩ 5 GΩ 20 %
>200 GΩ Unspecified Unspecified
2500 V <200 kΩ Unspecified Unspecified
200 kΩ to 500 kΩ 1 kΩ 5 %
0.50 MΩ to 5.00 MΩ 0.01 MΩ 5 %
5.0 MΩ to 50.0 MΩ 0.1 MΩ 5 %
50 MΩ to 500 MΩ 1 MΩ 5 %
0.50 GΩ to 5.00 GΩ 0.01 GΩ 5 %
5.0 GΩ to 50.0 GΩ 0.1 GΩ 5 %
50 GΩ to 500 GΩ 5 GΩ 20 %
>500 GΩ Unspecified Unspecified

Insulation test voltage accuracy: -0 %, +10 % @ 1 mA load current Charging rate for capacitive load: 5 s/μF Discharging rate for capacitive load: 1.5 s/μF

  Range Accuracy
Leakage current measurement 1 nA to 2 mA  ±(20 % + 2 nA) 
Capacitance measurement  0.01 μF to 2.00 μF  ±(15 % rdg + 0.03 μF)
Test voltage for insulation resistance 250 V to 2500 V  ±(3 % + 3 V) 
Warning for energized circuit
Warning range >30 V 
Timer (F1537 only)
Range 0 to 99 min  
Resolution Setting: 1 min Alert: 1 s
Short circuit current
F1535 >2 mA
F1537 >5 mA
ACV/DCV/resistance measurement (1537 only)
Function Range Resolution Accuracy
±(% rdg + dgt)
VAC 0 V to 600.0 V 0.1 V ±(2 % +10)
（45 Hz to 500 Hz）
VDC 0 V to 600.0 V 0.1 V ±(2 % +10)
Resistance 0 Ω to 600.0 Ω 0.1 Ω ±(2 % +10)
600 Ω to 6000 Ω 1 Ω
6.00 kΩ to 60.00k Ω 0.01 kΩ

FLUKE-1537

Fluke 1537 2500V Advanced Insulation Tester

Includes:

  • Fluke 1537 Insulation Resistance Tester
  • Test leads with alligator clips (red, black, green)
  • Probe (red, black)
  • Soft carrying case
  • USB cable (Fluke 1537 only)
  • PC software (Fluke 1537 only - downloadable from the Fluke Website)

FLUKE-1535

Fluke 1535 2500V Insulation Tester

Includes:

  • Fluke 1535 Insulation Resistance Tester
  • Test leads with alligator clips (red, black, green)
  • Probe (red, black)
  • Soft carrying case