Fluke 1503 Insulation Resistance Meter

A durable and portable insulation resistance tester designed for both residential and commercial electricians. It conducts insulation tests ranging from 0.01 MΩ to 2000 MΩ, utilizing two test voltages: 500 V and 1000 V. The tester incorporates live circuit detection to safeguard against conducting insulation tests when voltages exceeding 30 V are detected. Additionally, it accurately measures resistance across a range from 0.01 Ω to 20.00 kΩ.

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The Fluke 1503 Insulation Resistance Meter is tailored for essential insulation testing in residential and commercial electrical applications. This compact and robust tool, similar in size to the Fluke 1507 but with fewer features, fits comfortably in hand and offers reliable performance at a competitive price point. It efficiently handles common tests and features a remote probe that streamlines repetitive or difficult-to-access testing tasks. Additional capabilities include:

  • Measures AC/DC voltage from 0.1 V to 600 V
  • Incorporates auto-discharge of capacitive voltage to enhance user safety
  • Provides low-ohms earth-bond continuity (200 mA)
  • Features a large, backlit display for clear visibility of results
  • Safeguards against overvoltage with CAT IV 600 V rating
  • Includes a comprehensive set of accessories: remote probe, test leads, test probes, alligator clips, and a one-year warranty
  • Supports hands-free operation with optional Fluke TPAK magnetic hanging system
  • Operates on four AA alkaline batteries, delivering enough power for at least 1000 insulation tests before replacement

Specifications: Fluke 1503 Insulation Resistance Meter

AC/DC Voltage Measurement
AccuracyRange600.0 V
Resolution0.1 V
50 Hz to 400 Hz ±(% of Rdg + Digits)±(2% + 3)
Input impedance3 MΩ (nominal), < 100 pF
Common mode rejection ratio (1 kΩ unbalanced)> 60 dB at DC, 50 or 60 Hz
Overload protection600 V rms or DC
Earth Bond Resistance Measurement
Range/Resolution20.00 Ω0.01 Ω
200.0 Ω0.1 Ω
2000 Ω1.0 Ω
20.00 kΩ0.01 kΩ
Accuracy±(1.5% + 3)
Overload protection2 V rms or DC
Open circuit test voltage> 4.0 V, < 8 V
Short circuit current> 200.0 mA
Insulation Specifications
Measurement range0.01 MΩ to 2000 MΩ
Test voltage500 V, 1000 V
Test voltage accuracy+ 20%, – 0%
Short circuit current1 mA nominal
Auto dischargeDischarge time < 0.5 second for C = 1 µF or less
Live circuit indicatorInhibit test if terminal voltage > 30 V prior to initialization of test
Maximum capacitive loadOperable with up to 1 µF load
Measure accuracy
500 V±(1.5% + 5)
1000 V±(1.5% + 5) to 2000 MΩ, ±(10% + 3) above 2000 MΩ
General Specifications
Maximum voltage applied to any terminal:600 V AC rms or DC
Storage temperature-40°C to 60°C (-40°F to 140°F)
Operating temperature-20°C to 55°C (-4°F to 131°F)
Temperature coefficient0.05 x (specified accuracy) per °C for temperatures < 18°C or > 28°C (< 64°F or > 82°F)
Relative humidity
0% to 95% @ 10°C to 30°C (50°F to 86°F)
0% to 75% @ 30°C to 40°C (86°F to 104°F)
0% to 40% @ 40°C to 55°C (104°F to 131°F)
VibrationRandom, 2 g, 5-500 Hz per MIL-PRF-28800F, Class 2 instrument
Shock1 meter drop per IEC 61010-1 2nd Edition (1 meter drop test, six sides, oak floor)
Electromagnetic compatibilityIn an RF field of 3 V/M, accuracy = specified accuracy (EN 61326-1:1997)
SafetyComplies with ANSI/ISA 82.02.01 (61010-1) 2004, CAN/CSA-C22.2 NO. 61010-1-04, and IEC/EN 61010-1 2nd Edition for measurement category IV 600 V (CAT IV)
CertificationsCSA per standard CSA/CAN C22.2 No. 61010.1-04; TUV per standard IEC/EN 61010-1 2nd Edition
BatteriesFour AA batteries (NEDA 15A or IEC LR6)
Battery llifeInsulation test use:Tester 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.
Resistance measurements:Tester can perform at least 2500 earth bond resistance measurements with fresh alkaline batteries at room temperature. These are standard tests of 1 Ω with a duty cycle of 5 seconds on and 25 seconds off.
Size (H x W x L)5.0 x 10.0 x 20.3 cm (1.97 x 3.94 x 8.00 in)
Weight550 g (1.2 lb)
IP ratingIP40
AltitudeOperating2000 m CAT IV 600 V, 3000 m CAT III 600 V
Non-operating (storage)12,000 m
Over-range capability110% of range
Included accessoriesTL224 Test Leads, TP74 Test Probes, clips PN 1958654 (red) and PN 1958646 (black), holster and remote probe

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