Fluke 1507 Insulation Resistance Tester - Fluke-1507
The Fluke 1507 Insulation Resistance Tester is a five-voltage handheld megohmmeter built for maintenance programs that need rigorous insulation testing without the cost or complexity of a full combination instrument. With selectable test voltages of 50V, 100V, 250V, 500V, and 1000V, automatic PI and DAR ratio calculation, and a measurement range to 10 GΩ, the 1507 covers the full spectrum of motor, cable, and equipment insulation testing required by IEEE Std 43, IEC 60034, and aircraft maintenance manuals. Compared to the 1587 FC – which adds a complete True-RMS multimeter, K-type thermocouple temperature measurement, and Fluke Connect wireless connectivity – the 1507 focuses purely on insulation resistance measurement in a dedicated form factor optimized for frequent, repetitive insulation testing.
Key Features
- Five Selectable Test Voltages (50V, 100V, 250V, 500V, & 1,000V DC): The 1507 covers the full range of insulation test voltages required by aviation and industrial maintenance procedures. 50V and 100V test cables and small motors with lower-voltage insulation ratings. 250V is standard for general wiring insulation checks. 500V is the most widely specified motor winding test voltage per IEEE Std 43 and IEC 60034. 1,000V tests heavier-duty equipment where higher dielectric stress is called for. Matching the test voltage to the maintenance manual specification is essential for both test validity and equipment safety.
- Insulation Resistance to 10 GΩ: The measurement range from 0.01MΩ to 10 GΩ (10,000 MΩ) covers deteriorating insulation (low single-digit MΩ values that indicate immediate attention required) through excellent-condition insulation on recently commissioned equipment (multi-gigaohm readings). FAA maintenance procedures typically specify minimum acceptable insulation resistance values that the 1507 measures directly with ±5% accuracy across most of the range.
- Polarization Index (PI) Testing: The 10-minute/1-minute insulation resistance ratio is the definitive test for motor winding moisture contamination and thermal degradation. A PI ratio above 2.0 (per IEEE Std 43) indicates dry, healthy insulation; below 1.0 indicates contamination or damage requiring corrective action. The 1507 automatically calculates and displays PI ratios; no manual calculation required.
- Dielectric Absorption Ratio (DAR) Testing: The 60-second/30-second resistance ratio provides a faster insulation condition indication than the full 10-minute PI test. DAR is particularly useful for field assessments where a complete PI test cycle is impractical during limited maintenance access windows.
- Automatic Discharge of Capacitive Test Objects: Motors and cables accumulate charge during insulation testing that can cause shock hazards after the test voltage is removed. The 1507 automatically discharges the test object at the end of each test (under 0.5 seconds for loads up to 1 µF), protecting technicians and preventing measurement errors from residual charge.
- Live Circuit Detection: The 1507 inhibits the insulation test if it senses more than 30V on the test terminals, preventing the technician from applying high-voltage test stress to an energized circuit and protecting both the operator and the equipment under test.
- Programmable Pass/Fail Thresholds: A user-set minimum insulation resistance threshold triggers a visual pass/fail indicator, letting maintenance technicians apply program-specific minimum resistance specifications directly in the field without converting readings against reference tables.
- Voltage Verification and Earth-Bond Resistance: Beyond insulation testing, the 1507 measures AC/DC voltage from 0.1V to 600V and earth-bond (low-ohms) resistance from 0.01Ω to 20 kΩ with a 200 mA test current — enough to verify supply voltage, confirm de-energization, and run bonding-continuity checks without grabbing a second instrument.
Technical Specifications Overview
The 1507 tests at five selectable DC voltages (50V, 100V, 250V, 500V, and 1,000V), measuring insulation resistance from 0.01MΩ to 10 GΩ with ±5% accuracy. It calculates PI and DAR test ratios automatically and includes programmable pass/fail thresholds, live circuit detection, and auto-discharge of capacitive loads. The 1507 includes basic AC/DC voltage measurement to 600V and earth-bond resistance to 20 kΩ, but does not include a full multimeter function set – see the 1587 FC for a combined insulation tester and True-RMS multimeter with Fluke Connect. For higher test voltages above 1000V, see the 1550C (5kV) for medium-voltage equipment or the 1555 (10kV) for utility power cable applications.
Motor & Cable Insulation Testing Applications
- Aircraft motor winding periodic insulation testing, standardized 500V insulation resistance testing on actuator motors, pump motors, and blower motors per aircraft maintenance manual requirements
- Industrial motor predictive maintenance programs, recurring insulation resistance measurement, and PI testing to trend winding condition over time, and schedule rewinding before failure
- Motor return-to-service verification, PI, and DAR testing confirm winding insulation drying after motor storage, flooding, or high-humidity exposure before powering up
- Cable and conductor insulation spot-checks, verifies minimum insulation resistance on repaired cable runs and newly pulled conductors before energization
- Switchgear and panel insulation verification, basic insulation resistance checks on disconnect switches, circuit breakers, and bus assemblies at 500V
Fluke 1507 Calibration
PJi operates an ISO/IEC 17025 Accredited Calibration Lab and provides NIST-traceable calibration for the Fluke 1507 at the time of purchase. Add calibration to your order at checkout. Our calibration documentation satisfies FAA Part 145 tool control requirements, ISO 9001 quality system records, and AS9100 traceability requirements. PJi is the one-stop source: the instrument and the calibration certificate in a single transaction. Calibration-only companies (Custom-Cal, Fox Valley Metrology, ATS) cannot sell you the instrument. Amazon and Grainger cannot calibrate it. PJi does both.
Why Buy from Pilot John International
Pilot John International is an authorized Fluke distributor with specialized expertise serving aviation maintenance, FAA Part 145 repair stations, and industrial MRO facilities. Unlike Amazon, Grainger, or Test Equipment Depot, which sell Fluke instruments but offer zero calibration services, PJi's in-house ISO/IEC 17025 Accredited Calibration Lab calibrates your instrument at purchase. We stock the full Fluke catalog, ship same-business-day on in-stock items, and our technical staff understands the demands of aviation and industrial electrical maintenance.
| General Information | |
|---|---|
| Part # | Fluke-1507 |
| Manufacturer | Fluke |
| Shipping Information | |
|---|---|
| Product Weight | 1.13 lbs. |
| Product Dimensions | 10 x 7 x 4 in. |
| HTS | 9030333400 |
| ECCN | 3A992 |
| Specifications | |
|---|---|
| Accuracy | ±5% of reading + 5 digits |
| Auto-Discharge | Yes (after each test) |
| Continuity | Yes |
| DAR Testing | Yes (60-sec / 30-sec ratio, automatic) |
| Insulation Resistance Range | 0.01MΩ to 2,000MΩ |
| Model Number | 1507 (PJi SKU: Fluke-1507) |
| Multimeter Functions | No (see Fluke 1587 FC for combined instrument) |
| Pass/Fail Threshold | Programmable |
| PI Testing | Yes (10-min / 1-min ratio, automatic) |
| Product Type | Dedicated Insulation Resistance Tester |
| Safety Rating | CAT III 600V |
| Test Voltage | 500V DC |
| Warranty | Limited lifetime |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* |
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QUESTIONS & ANSWERS
Yes – the Fluke 1507 supports five selectable insulation test voltages: 50V, 100V, 250V, 500V, and 1,000V DC. That covers low-voltage cable and small-motor testing at 50V to 250 V, the standard 500V motor winding test per IEEE Std 43 and IEC 60034, and higher-stress 1000 V testing for heavier equipment. The 1507 is a full five-voltage handheld insulation tester, not a single-voltage instrument.
The Fluke 1507 measures insulation resistance from 0.01 MΩ to 10 GΩ (10,000 MΩ), with ±5% accuracy across most of the range. That covers everything from clearly failed insulation in the low MΩ region up through excellent-condition windings and cables that read in the multi-gigaohm range. The high end offers ample headroom for trending insulation values on newly installed or recently overhauled equipment.
The Fluke 1507 runs on four AA alkaline batteries (NEDA 15A / IEC LR6), readily available at any hardware store, FBO supply room, or maintenance crib. A fresh set delivers at least 1,000 standard insulation tests (1,000V into 1 MΩ at a 5-seconds-on / 25-seconds-off duty cycle), or at least 2,500 earth bond resistance measurements – enough to cover months of routine maintenance testing between battery swaps.
The Fluke 1507 carries a 1-year limited warranty from Fluke covering defects in materials and workmanship under normal use. Calibration is separate from warranty coverage, and PJi can provide NIST-traceable ISO/IEC 17025 calibration at the time of purchase or any time thereafter – with documentation that satisfies FAA Part 145 tool control, ISO 9001 quality systems, and AS9100 traceability requirements.
The Fluke 1507 ships with a remote test probe that has a built-in trigger, letting the technician initiate insulation tests from a fixed contact point without holding the meter. That matters for aircraft and hangar work in two ways: the technician can position the probe on a hard-to-reach terminal — deep in a motor junction box, behind a panel – and step back before triggering the test. The meter sits in a convenient location, handling the lead-side connection.
The Fluke 1507 includes live circuit detection that inhibits the insulation test if it senses more than 30 V on the test terminals – a critical guardrail against applying high-voltage test stress to an energized circuit. It also automatically discharges capacitive loads (under 0.5 seconds for loads up to 1 µF) after each test, eliminating residual voltage on cable runs and motor windings before the leads are touched. The instrument carries a CAT IV 600 V overvoltage rating for direct connection to service entrance and distribution panels.
The Fluke 1507 includes basic AC/DC voltage measurement from 0.1 V to 600 V and an earth-bond (low-ohms) resistance function that tests from 0.01 Ω to 20 kΩ with a 200 mA test current. These are not full multimeter capabilities – for that, the Fluke 1587 FC combines a complete True-RMS multimeter with the insulation tester – but they are enough to verify supply voltage, confirm de-energization, and run bonding-continuity checks before insulation testing without grabbing a second instrument.
The Fluke 1507 is drop-tested to 1 meter per IEC 61010-1 (six sides, oak floor) and vibration-tested to MIL-PRF-28800F Class 2 standards for random vibration. The enclosure carries an IP40 rating against small foreign objects (non-operating), and the operating temperature range is -20°C to 55°C. That combination handles hangar, FBO, and outdoor ramp conditions across most North American climates.
The Fluke 1507 ships with the meter itself, TL224 test leads, TP74 test probes, alligator clips (red and black), a protective holster, the remote test probe, four AA batteries (installed), and user documentation. PJi can bundle the optional TPAK magnetic hanging system and NIST-traceable ISO/IEC 17025 calibration with the meter at the time of order.
Both the Fluke 1507 and the Fluke 1587 FC offer five-voltage insulation testing (50V, 100V, 250V, 500V, and 1,000V), automatic PI and DAR calculation, live circuit detection, and auto-discharge of capacitive loads. The 1587 FC adds full True-RMS multimeter functions (frequency, capacitance, temperature via K-type thermocouple), Fluke Connect wireless connectivity, and a longer warranty. The 1507 is the better fit when the application is pure insulation testing, and a second instrument already handles multimeter duties; the 1587 FC consolidates both into one tool.
