Fluke 1577 Insulation Multimeter

Fluke 1577 Insulation Multimeter is rated 4.7 out of 5 by 7.
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  • Fluke 1577 2-in-1 Insulation Tester Multimeter | Fluke

Key features

  • Insulation test voltages 500 V, 1000 V
  • Insulation test: 0.1 MΩ to 600 MΩ
  • Auto discharge of capacitive voltage
  • AC/DC Voltage and milliamps
  • Three-year warranty

Product overview: Fluke 1577 Insulation Multimeter

Two powerful tools in one

The Fluke 1577 Insulation Multimeter combine a digital insulation tester with a full-featured, true RMS digital multimeter in a single, compact, handheld unit, which provides maximum versatility for both troubleshooting and preventative maintenance.

Whether you work on motors, generators, cables, or switch gear, the Fluke 1577 Insulation Multimeter is ideally suited to help you with your tasks and at a cost that is far less than buying the two products.

Additional features

  • DC millivolts
  • Resistance (0.1 Ω to 50 MΩ)
  • Continuity
  • Remote probe, test leads, alligator clips
  • Rugged, utility hard case
  • Auto power off to save battery power
  • True RMS
  • Large display with backlight
  • Live circuit detection prevents insulation test if voltage > 30 V is detected for added user protection
  • CAT III 1000V, CAT IV 600V measurement category
  • Accepts optional Fluke TPAKTM magnetic hanging system to free your hands for other work

What's in the box:

  • 1577 Insulation Multimeter
  • Remote probe
  • Test leads
  • Alligator clips
  • Hard case
  • Four AA alkaline batteries
  • Quick reference guide
  • CD rom with manual

Specifications: Fluke 1577 Insulation Multimeter

Voltage DCMaximum voltage 1000 V
Maximum resolution0.001 V
Voltage ACMaximum voltage1000 V
Maximum resolution0.1 mV
Current DCMaximum amps 400 mA
Amps accuracy±(1.0%+2)
Maximum resolution0.01 mA
Current ACMaximum amps 400 mA
Amps accuracy±(2.0%+2)*
Maximum resolution0.01 mA
ResistanceMaximum resistance50 MΩ
maximum resolution0.1Ω
Insulation Test
Minimum test current @ 1kΩ/V1 mA
Test voltages500, 1000 V
Maximum resistance per test voltage50 V 
100 V 
250 V 
500 V 
1000 V600 MΩ
Maximum resolution per test voltage50 V0.01 MΩ
100 V0.01 MΩ
250 V0.1 MΩ
500 V0.1 MΩ
1000 V0.1 MΩ
Accuracy per test voltage50 V±(3% + 5)
100 V±(3% + 5)
250 V±(1.5% + 5)
500 V±(2.0% + 5)
1000 V±(2.0% + 5)
Environmental Specifications
Operating temperature–20°C to +55°C
Storage temperature-40°C to +60°C
Humidity (without condensation)0% - 95% (10°C – 30°C)
0% - 75% (30°C – 40°C)
0% - 40% (40°C – 55°C)
Operating altitude2000 m
Safety Specifications
GeneralIEC 61010-1: Pollution Degree 2
MeasurementIEC 61010-2-033: CAT IV 600V / CAT III 1000V
Mechanical and General Specifications
Size203 x 100 x 50 mm (with holster)
Weight624 g
Warranty3 years
Battery life alkalineMeter use 1000 hours
Insulation test useMeter can perform at least 1000 insulation tests with fresh alkaline batteries at room temperature. These are standard tests of 1000 V into 1 MΩ with a duty cycle of 5 seconds on and 25 seconds off.
IP ratingIP40

Models: Fluke 1577 Insulation Multimeter

Fluke 1577
Fluke 1577 Insulation Multimeter
Buy it


  • Remote probe
  • Test leads
  • Alligator clips
  • Hard case
  • Four AA alkaline batteries
  • Quick reference guide
  • CD rom with manual

What does it mean when the fluke tester reads 11 G

Asked by: Kells007
It means your insulation resistance is very high. Does the display actually say this? >11G? It means your insulation resistance is greater than 11 gigohms, the limit to the meter's ability to measure insulation resistance on the high side.
Answered by: Leigh Clambakes
Date published: 2024-01-08
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Rated 3 out of 5 by from Easy to Use Multiple Function We bought four of FC 1587 great product , only problem with 4 AA battery holders , suggest to stick to old 9V type battery . Most of them battery spring holders snap.
Date published: 2021-08-22
Rated 5 out of 5 by from Easy to use. I had our company purchase one of these about 4 years ago, and it has come in handy on quite a few occasions. From testing the insulation, to a multimeter, it handles just about everything our shop needs.
Date published: 2016-12-12
Rated 5 out of 5 by from Big time and money saver! This is a great way to save time when you are in the mass building industry. Its one tool that performs several operations with great accuracy. It is light weight and easy to operate. It is super lightweight and is easy to keep by your side with the magnetic hanging system that keeps both hands free for multi-tasking! It also has a captive discharge for added safety! I have bought one for each man on the crew and recommended to many others and have gotten 100% positive feedback. I am a repeat customer!
Date published: 2016-12-11
Rated 5 out of 5 by from Great meter Purchased the 1587 in January of 2015. It has performed flawlessly. Having a full functioning multimeter with a built in insulation tester in my tool bag is super convenient and is great for working on VFDs and motors. No more lugging around a hand crank insulation tester. Looking forward to upgrading to the 1587 with Fluke Connect.
Date published: 2016-12-08
Rated 5 out of 5 by from Should be in every toolbox Simple straightforward operation. No need to re-learn how to use on every job.
Date published: 2016-12-08
Rated 5 out of 5 by from MegOhmMeter ive owned this unit for a few years now. it works amazing, it of now my go to meter for almost every job except amp readings
Date published: 2016-12-07
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