Fluke 1550C Insulation Resistance Tester

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FE 1550C

Price: $4,199.95

NIST Traceable Calibration
Add NIST Calibration to your 1550C with data & uncertainties+$100.00
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The new Fluke 1550C insulation resistance tester offers digital insulation testing up to 5 kV, making it ideal for testing a wide range of high voltage equipment including switchgear, motors, generators and cables.

Fluke insulation testers can now conduct the entire range of test voltages specified in IEEE 43-2000 with a best in class, 3 year warranty and CAT IV 600 V safety rating. With measurement storage and PC interface, the 1550C is a perfect tool for preventative or predictive maintenance programs designed to identify potential equipment failures before they occur.


  • Insulation resistance/leakage current measurement
  • Step voltage testing
  • Dielectric absorption ratio
  • Polarization index
  • Ramp voltage
For a 10kV model, see the Fluke 1555 Insulation Resistance Tester.

The Fluke 1550C replaced the Fluke 1550B in early May 2010.

What's Included:
  • Test cables with alligator clips (red, black, green)
  • Alligator clips
  • Infrared adapter with interface cable
  • FlukeView Forms basic CD-ROM
  • AC power cord
  • Soft carrying case
  • Users manual on CD-ROM
  • Quick Reference card
  • English manual
  • USB-IR cable installation guide
  • FlukeView Forms installation guide

The Good:

The Bad:

The Bottom Line:

Full Review

  • Test voltages up to 5 kV provides solutions for all applications
  • CAT III 1000 V, CAT IV 600 V safety rating
  • Voltage breakdown detection alerts the user that voltage is present and gives the voltage reading up to 600 V ac or dc for increased user safety
  • Selectable test voltages in 50 V steps from 250 to 1000 V, and 100 V steps above 1000 V
  • Measurements can be stored in up to 99 memory locations, with each location assigned a unique, user defined, label for easy recall
  • Long battery life gives the user over 750 tests between charges
  • Automatic calculation of Dielectric Absorption (DAR) and Polarization Index (PI) with no additional setup
  • Guard system eliminates the effect of surface leakage current on high-resistance measurements
  • Large digital/analog LCD for easy viewing
  • Capacitance and leakage current measurement
  • Ramp function for breakdown testing
  • Resistance measurements up to 2TΩ
  • Timer settings up to 99 minutes for timed tests
  • 3-year warranty

The Fluke 1550C's accuracy is specified for one year after calibration at operating temperatures of 0 C to 35 C. For operating temperatures outside the range (-20 C to 0 C and 35 C to 50 C), add .25 % per C, except on the 20 % bands add 1 % per C.

Insulation Resistance Measurement
Test voltage (DC)
Range (DC)
Accuracy ( reading)
250 V
< 200 kΩ
200 kΩ to 5 GΩ
5 GΩ to 50 GΩ
> 50 GΩ
5 %
20 %
500 V
< 200 kΩ
200 kΩ to 10 GΩ
10 GΩ to 100 GΩ
> 100 GΩ
5 %
20 %
1000 V
< 200 kΩ
200 kΩ to 20 GΩ
20 GΩ to 200 GΩ
> 200 GΩ
5 %
20 %
2500 V
< 200 kΩ
200 kΩ to 50 GΩ
50 GΩ to 500 GΩ
> 500 GΩ
5 %
20 %
5000 V
< 200 kΩ
200 kΩ to 100 GΩ
100 GΩ to 1 TΩ
> 1 TΩ
5 %
20 %
10000 V
(Fluke 1555 only)
< 200 kΩ
200 kΩ to 200 GΩ
10 GΩ to 2 TΩ
> 2 TΩ
5 %
20 %
Bar graph range
0 to 1 TΩ
Insulation test voltage accuracy
-0 %, +10 % at 1 mA load current
Induced ac mains current rejection
2 mA maximum
Charging rate for capacitive load
5 seconds per μF
Discharge rate for capacitive load
1.5 s/μF

Leakage current measurement
1 nA to 2 mA
(5 % + 2 nA)
Capacitance measurement
0.01 uF to 15.00 μF
(15 % rdg + 0.03 μF)
0 to 99 minutes
Setting: 1 minute
Indication: 1 second
Live circuit warning
Warning range
30 V to 660 V ac/dc, 50/60 Hz
Voltage accuracy
(15 % + 2 V)
General Specifications
75 mm x 105 mm
12 V lead-acid rechargeable battery, Yuasa NP2.8-12
Charger Input (AC)
85 V ac 50/60 Hz 20 VA
This Class II (double insulated) instrument is supplied with a Class 1 (grounded) power cord. The protective earth terminal (ground pin) is not connected internally. The extra pin is for added plug retention only.
170 mm x 242 mm x 330 mm (6.7 in x 9.5 in x 13 in)
3.6 kg (7.94 lb)

Temperature (operating)
-20 C to 50 C (-4 F to 122 F)
Temperature (storage)
-20 C to 65 C (-4 F to 149 F)
80 % to 31 C decreasing linearly to 50 % at 50 C
2000 m
Enclosure sealing
Input overload protection
1000 V ac
Electromagnetic compatibility
EN 61326
Safety compliance
CAT III 1000 V, CAT IV 600 V
Pollution degree

Fluke ViewForms basic software requires a PC running Windows 2000, Windows XP and Windows Vista.
No user reviews available.
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