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®
1520
MegOhmMeter
Users Manual
September 2000 Rev.2, 2/03
© 2000-2003 Fluke Corporation. All rights reserved. Printed in USA
All product names are trademarks of their respective companies.
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Table of Contents Title Page Unpacking the Meter......................................................................................... 1 Safety Information and Symbols ....................................................................... 3 Key functions .................................................................................................... 6 Display.......................................................................................................... 8 Using the Meter ......
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List of Tables Table Title Page 1. Key and Switch Descriptions..................................................................... 6 2. Display Description ................................................................................... 8 List of Figures Figure Title Page 1. Shipment Content ..................................................................................... 2 2. Display ...................................................................................................... 9
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Fluke 1520 Unpacking the Meter The Fluke Model 1520 MegOhmMeter (hereafter, “the meter”) is a handheld instrument designed primarily to make resistance/insulation resistance measurements. The MegOhmMeter includes the following items, see Figure 1: • 2 test leads, red and black, 1.5 m • 2 test probes, red and black • 2 alligator clips, red and black • Hand strap • Carrying case • CD ROM (Not Pictured) 1
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Fluke 1520 Users Manual acf02f.eps Figure 1. Shipment Content 2
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MegOhmMeter Safety Information and Symbols Safety Information and Symbols A Caution identifies conditions and actions that may damage the Meter. A W Warning identifies conditions and actions that pose hazard(s) to the user. International symbols on the Meter and in the manual are explained below. Y Risk of electric shock J Earth See manual Fuse W I Equipment protected by double or AC or DC T D reinforced Insulation M Battery Recycling information Conforms to CSA C22.2 No 1010.1-92 + Conforms to
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Fluke 1520 Users Manual W Safety Information Use of instrument in a manner not specified by the manufacturer may impair safety features/protection provided by the equipment. Read the following safety information carefully before using or servicing the instrument. To avoid electric shock or fire, do the following: • Avoid working alone. • Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Damaged leads must be replaced. Do not use the Meter if it looks da
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MegOhmMeter Safety Information and Symbols W Safety Information (cont.) • Place test leads in proper input terminals. • Disconnect the live test lead before disconnecting the neutral test lead. • Do not use the Meter if the battery indicator ( G ) shows a battery empty condition. • Use only Fluke recommended batteries and fuse. • Do not use the Meter with any parts or cover removed. • Do not use the Meter around explosive gas, vapor or dust. • Disconnect the test leads from power sources and fro
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Fluke 1520 Users Manual Key functions Table 1. Key and Switch Descriptions Rotary switch To select a measurement function. Used for the Insulation Resistance and Low Resistance test functions. T Press and hold this button until the main reading is stable. Locks the test in Insulation Resistance or Low Resistance function. To lock: press and hold TEST, then press LOCK and simultaneously release both buttons. The icon V LOCK appears on the display. • Insulation Resistance- this mode continuously
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MegOhmMeter Key functions Table 1 (continued) Resistance Beeper function Turns the Beeper function ON and OFF. When ON, the R icon appears on N the display and the Meter beeps at short circuit. Low Resistance function Turns the test lead resistance compensation ON. Z The X icon appears on the display. To compensate, touch the probe tips together, then press and hold ZERO until the Meter beeps. The main display indicates 0.00. Backlight button C Turns the display backlight ON and OFF. 7
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Fluke 1520 Users Manual Display Table 2 and Figure 2 describe the display. Table 2. Display Description 1 Voltage applied to the probes in Insulation Resistance function. 2 Low Resistance/Resistance function indicator. 3 Resistance reading held from the last measurement in Insulation Resistance or Low Resistance function. 4 Beeper symbol shows if beeper function is turned on in Resistance function. 5 Zero symbol is on if test leads are zeroed out. 6 Main reading display for all functions. 7 Ana
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MegOhmMeter Key functions 1 2 3 4 5 10 9 8 7 6 acf12f.eps Figure 2. Display 9
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Fluke 1520 Users Manual Using the Meter Connecting to the Circuit Under Test Figure 3 shows the proper connections. W Warning To prevent electric shock when performing resistance tests, remove all power from the circuit to be measured. W Warning To prevent electric shock, first connect the test leads to the Meter inputs before you make connection to the circuit under test. 10
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MegOhmMeter Using the Meter acf04f.eps Figure 3. Connecting to the Circuit Under Test 11
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Fluke 1520 Users Manual Auto-Shut-Off The Meter automatically turns off after 15 minutes of non-use. In Lo Ohms mode, the meter turns off after 5 minutes of non-use. To turn the meter back on, turn the rotary switch to OFF, then to the desired function. Measuring Insulation Resistance W Warning • Measuring insulation resistance requires the application of potentially dangerous voltages to the circuit. This may include exposed bonded metalwork. • Before proceeding, ensure that the installation i
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MegOhmMeter Using the Meter To measure insulation resistance, do the following: 1. Select the test voltage. 2. Connect the probes to the circuit to be measured. The meter automatically detects if the circuit is energized, and displays the detected voltage. W Warning A repetitive beep and the flashing high voltage symbol ( Y ) warn the user if voltage more than 30 V ac or dc is present. If the voltage is > 30 V ac or dc, remove the voltage from the acf05f.eps circuit under test before proceedi
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Fluke 1520 Users Manual The Meter beeps when the reading is stable. The upper right display shows the same resistance reading as the main display. When resistance is higher than the maximum display range, the meter reacts as follows: • If the 250V range is selected, the display reads >1000 MΩ. • If the 500V range, is selected, the display reads >2000 MΩ. • If the 1000V range, is selected, the display reads >4000 MΩ. 4. While keeping the probes on the test points, release the TEST button. The ci
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MegOhmMeter Using the Meter Using the LOCK Function to Measure Insulation Resistance The LOCK function holds the test voltage on the probes. Use LOCK to make long duration measurements without having to push and hold the TEST button. To use the LOCK function: 1. Press the TEST button, then press the LOCK button, and then release both simultaneously. W Warning In this mode a potentially dangerous voltage is continuously applied to the probes. In this mode, if the probes are disconnected from the
