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- Page 1 1535/1537 Insulation Tester Users Manual April 2017 Rev. 1, 6/21 (English) ©2017-2021 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All Product names are trademarks of their respective companies.
- Page 2 The Fluke 1537 will be free from defects in material and workmanship for three years from the date of purchase. The Fluke 1535 will be free from defects in material and workmanship for one year from the date of purchase.
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Page 3: Table Of Contents
Table of Contents Introduction......................... Contact Fluke ........................Safety Information ......................Symbols..........................Unpack the Tester ......................The Tester..........................Pushbuttons....................... Tester On/Off......................Display.......................... 10 Guard Terminal Use....................11 Test Circuit Connections ....................13 Before an Insulation Test ....................14 Preset Test Voltage Selection ................15 Program a Test Voltage (1537 only) .............. -
Page 4: Introduction
Introduction The Fluke 1535/1537 Insulation Testers (the Tester or Product) are high-voltage insulation testers to validate general circuits, such as switchgear, motors, and cables. The Tester features: • Large liquid crystal display (LCD) • Preset test voltages: 250 V, 500 V, 1000 V, 2500 V •... -
Page 5: Contact Fluke
1535/1537 Users Manual Contact Fluke Fluke Corporation operates worldwide. For local contact information, go to our website: www.fluke.com. To register your product, or to view, print, or download the latest manual or manual supplement, go to our website. Fluke Corporation Fluke Europe B.V. - Page 6 Insulation Tester Safety Information Do not use in CAT III or CAT IV environments without the protective cap installed on test probe. The protective cap decreases the exposed probe metal to <4 mm. This decreases the possibility of arc flash from short circuits. Comply with local and national safety codes.
- Page 7 1535/1537 Users Manual Do not use in distribution systems with voltages higher than 660 V. Use only recommended test leads. Remove all power from the circuit under test and discharge circuit capacitance before testing resistance or capacitor with the tester.
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Page 8: Symbols
Insulation Tester Symbols Symbols Table 1 lists the symbols used on the Tester and in the manual. Table 1. Symbols Symbol Definition WARNING. HAZARDOUS VOLTAGE. Risk of electric shock. WARNING. RISK OF DANGER. Consult user documentation. » Conforms to European Union directives. Battery Continuity test or continuity beeper tone. -
Page 9: Unpack The Tester
1535/1537 Users Manual Unpack the Tester The Tester includes these items: • Insulation Tester (includes batteries) • Quick Reference Guide • Test Cables with Alligator Clips (red, black, green) • Soft Carrying Case • Test Report The 1537 also includes a USB Cable. -
Page 10: The Tester
Insulation Tester The Tester The Tester Table 2 shows the location of the Tester features. Table 2. Features 30V MAX Item Description USB Port (1537 only) Input Terminals Pushbuttons Pushbuttons Table 3 shows the location of each pushbutton and describes the functions. - Page 11 1535/1537 Users Manual Table 3. Pushbuttons Model Item Description 1535 1537 Power On / Power Off DAR / PI / DAR + PI Selection DAR / PI / DAR + PI / DD / Ramp Selection ...
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Page 12: Tester On/Off
Insulation Tester The Tester Also use to access these menu items: • Voltage adjustment in 100 V for each step • Time limit xx-xx • T - 0 to 99 minutes T1, T2, T3 - T1 < T2 < T3 T1 >... -
Page 13: Display
1535/1537 Users Manual Display Table 4 shows the location of each display feature. XW Warning To prevent possible electrical shock, fire, or personal injury: Before and after any tests, do a voltage test to confirm that the Tester does not detect the presence of hazardous voltage. -
Page 14: Guard Terminal Use
Insulation Tester The Tester Table 4. Display Features (cont.) Continuity (1537 only) Test Voltage Setting Test Voltage Discharging Possible hazardous voltage is at the test terminals Battery Status Delete/Delete All Save Bar graph display of insulation resistance V ac or V dc voltage indicator Insulation and DMM resistance measurement indicator Text display;... - Page 15 1535/1537 Users Manual Figure 1 shows how to measure the resistance from one of the conductors to the outer shield. In this case, there is a leakage current along the surface of the inner insulation near the end of the cable. This leakage adds to the current that the negative terminal senses, and causes the Tester to read a lower resistance than it should.
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Page 16: Test Circuit Connections
Insulation Tester Test Circuit Connections Figure 3 shows how make the measurement setup better. Connect the Guard terminal to the unused wire and attach it to the inner insulation. This ensures that the Tester measures the leakage between the selected conductor and the outer shield, but removes the leakage path between conductors. -
Page 17: Before An Insulation Test
1535/1537 Users Manual Table 5. Test Lead Connections Item Description E - Earth Terminal L - Live Terminal Note The Tester does not have specified accuracy below 200 kΩ . When you do a test below 200 kΩ or with the leads shorted, the Tester can show a reading. -
Page 18: Preset Test Voltage Selection
Insulation Tester Before an Insulation Test 1537 only: • Make a ramp test selection • Measure dielectric discharge (DD) • Compare insulation resistance • Set a time limit/duration for the test Use these features alone or in combination. Configure or validate (as appropriate) each feature before you start an insulation test. -
Page 19: Select A Ramp Or Steady-State Test (1537 Only)
1535/1537 Users Manual Select a Ramp or Steady-State Test (1537 only) The ramp test function is an automated test that checks insulation for a breakdown. During a ramp test, the output voltage starts at 0 V and increases linearly (100 V/s) until it reaches the specified test voltage or until the Tester senses a sudden drop in measured resistance. -
Page 20: Polarization Index (Pi)
Insulation Tester Before an Insulation Test Polarization Index (PI) As part of the insulation test, the Tester measures and stores polarization index (PI), when appropriate. A polarization index test requires 10 minutes to complete. Therefore, the Tester will start a countdown at 10 minutes. When an insulation test reaches 10 minutes, the polarization test is complete. -
Page 21: Dielectric Absorption Ratio
1535/1537 Users Manual Dielectric Absorption Ratio If appropriate, as part of the insulation test, the Tester stores the dielectric absorption ratio (DAR) with the measurement. A DAR test has a 1-minute duration and is measured and stored as invalid data for all insulation tests <1 minute. - Page 22 Insulation Tester Insulation Test PI/DAR is valid in these conditions: • Capacitance is ≤0.1 μF or Resistance is ≤100 MΩ. • Resistance is ≥200 kΩ and Capacitance ≤2 μF. • Current is ≥50 nA. To do an insulation test: 1. With the Tester turned on, set the available measurement options to meet your test requirements.
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Page 23: Store Test Results (1537 Only)
1535/1537 Users Manual Table 6. Insulation Resistance Measurements Item Description Digital main display Bar graph Any of the following conditions will stop an insulation test: User stops the test (push Time limit is complete (1537 only) Interference on the test circuit ... -
Page 24: View Test Results Stored In Memory (1537 Only)
Insulation Tester Insulation Test To store the results of an insulation test: 1. Push to save the measurement results. The Tester assigns and displays a sequential tag number to identify the measurement. 2. If the tag number is acceptable, push to store the data. - Page 25 1535/1537 Users Manual To view stored test data: 1. With the Tester turned on, push to view stored records. 2. Push to select Record. 3. Push to view the record detail. Note When a voltage is present at the terminals, that voltage is always shown on the top-center of the display, regardless of whether that voltage is sourced by the Tester or is from the circuit under test.
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Page 26: Delete Test Results Stored In Memory (1537 Only)
Insulation Tester V ac / V dc / Resistance (1537 only) Delete Test Results Stored in Memory (1537 only) You can delete a selected test result or delete all stored test results. To delete a selected test result: 1. Push to view stored records. -
Page 27: 1537 Pc Software
Do not use the test functions during communication with the PC. • Verify that the download is successful before deleting the stored test results on the Tester. • You can use the Fluke 1537 PC Software to clear results data stored in the Tester from the PC. -
Page 28: Maintenance
Insulation Tester Maintenance For complete information about how to use the software, see the Help module in the software. Maintenance There are no user-replaceable parts inside the Tester. XW Warning To prevent possible electric shock or personal injury: Do not repair or service the Product beyond what is described in ... -
Page 29: Parts And Accessories
1535/1537 Users Manual Figure 4. Battery Replacement Parts and Accessories Table 9 is a list of the replaceable parts available for the Tester. Table 10 is a list of the accessories available for use with the Tester. - Page 30 Go to to register your Product, read the Users Contact Fluke To contact Fluke, call Technical Support China at +86-400-810-3435. Or, visit Fluke’s website at To register your product, visit To view, print, or download the latest manual supplement, visit...
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Page 31: General Specifications
2500 V 2.5 MΩ 1300 General Specifications For a list of specifications for 1535/1537, please refer to the 1535/1537 Insulation Tester Quick Reference Guide, PN 5304200. Electrical Specifications The Tester’s accuracy is specified for 1 year after calibration at operating temperatures of 10 °C to 30 °C. - Page 32 Insulation Tester Electrical Specifications Table 12. Insulation Resistance Measurement (cont.) Test Voltage Range Resolution Accuracy <200 kΩ unspecified unspecified 200 kΩ to 500 kΩ 1 kΩ 0.50 MΩ to 5.00 MΩ 10 kΩ 5.0 MΩ to 50.0 MΩ 100 kΩ 50 MΩ...
- Page 33 1535/1537 Users Manual Table 12. Insulation Resistance Measurement (cont.) Test Voltage Range Resolution Accuracy <200 kΩ unspecified unspecified 200 kΩ to 500 kΩ 1 kΩ 0.50 MΩ to 5.00 MΩ 10 kΩ 5.0 MΩ to 50.0 MΩ 100 kΩ 2500 V 50 MΩ...
- Page 34 Insulation Tester Electrical Specifications Short circuit current 1535 >2 mA 1537 >5 mA Table 13. V ac / V dc / Resistance Measurement (1537 Only) Accuracy Function Range Resolution ±(% reading + Digits) ±(2 % +10) V ac 0 V to 600.0 V 0.1 V...
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Page 35: Principle Of Measurement And Resistance
1535/1537 Users Manual Table 15. Operating Uncertainties per EN 61557 Parameter Specification Typical Intrinsic IEC 61557-2 1.63 % 3.68 % uncertainty A, Reference conditions IEC 61557-2 Position 2.29 % 5.00 % E1, Reference Conditions ±90 ° IEC 61557-2 Supply E2, At low battery voltage stated 2.80 %... - Page 36 Insulation Tester Principle of Measurement and Resistance × I = current after 1-minute discharge (Dielectric Discharge) V = voltage at moment before discharge C = measured object capacitor...
- Page 37 1535/1537 Users Manual...
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