® 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.
Table of Contents Title Page Unpacking the Meter......................................................................................... Safety Information and Symbols ....................................................................... Key functions .................................................................................................... Display .......................................................................................................... Using the Meter .......................
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List of Tables Table 1. 2. Title Page Key and Switch Descriptions..................................................................... 6 Display Description ................................................................................... 8 List of Figures Figure 1. 2. 3. 4. 5. 6. Title Page Shipment Content ..................................................................................... Display ...................................................................................................
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.
Fluke 1520 Users Manual acf02f.eps Figure 1.
MegOhmMeter Safety Information and Symbols Safety Information and Symbols W A Caution identifies conditions and actions that may damage the Meter. A 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 W See manual T Equipment protected by double or reinforced Insulation M P CAT III J I D Battery Earth Fuse AC or DC Recycling information Conforms to CSA C22.2 No 1010.
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 damaged.
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 ( ) 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.
Fluke 1520 Users Manual Key functions Table 1. Key and Switch Descriptions T L 6 Rotary switch To select a measurement function. Used for the Insulation Resistance and Low Resistance test functions. 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.
MegOhmMeter Key functions Table 1 (continued) N Resistance Beeper function Turns the Beeper function ON and OFF. When ON, the R icon appears on the display and the Meter beeps at short circuit. Z Low Resistance function Turns the test lead resistance compensation ON. The 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. C X Backlight button Turns the display backlight ON and OFF.
Fluke 1520 Users Manual Display Table 2 and Figure 2 describe the display. Table 2. Display Description 8 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.
MegOhmMeter Key functions 1 2 3 4 10 5 9 8 7 6 acf12f.eps Figure 2.
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. Warning W To prevent electric shock, first connect the test leads to the Meter inputs before you make connection to the circuit under test.
MegOhmMeter Using the Meter acf04f.eps Figure 3.
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 • • 12 W Warning Measuring insulation resistance requires the application of potentially dangerous voltages to the circuit. This may include exposed bonded metalwork.
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. Warning W 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 circuit under test before proceeding with the next step.
Fluke 1520 Users Manual 4. 14 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. While keeping the probes on the test points, release the TEST button.
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 2. Warning In this mode a potentially dangerous voltage is continuously applied to the probes.
Fluke 1520 Users Manual Measuring Low Resistance To measure low resistance: 1. Zero out the test lead resistance (see Table 1). 2. Connect the probes to the circuit to be measured. If voltage is present on the probes, the voltage is displayed. Warning A repetitive beep and the flashing high voltage acf06f.eps 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 circuit under test before proceeding with the next step. 3.
MegOhmMeter Using the Meter 5. Exchange the red (+) and black (-) probes on the circuit and repeat steps 3 and 4 to reverse the polarity of the test current. The reading should be the same as the previous. This test is useful to detect corroded connections, which can cause different readings for both polarities. Using the LOCK Function to Measure Resistance The LOCK function is used to continuously supply the test current to the circuit to be tested.
Fluke 1520 Users Manual Measuring Resistance 1. 2. Connect the probes to the circuit to be measured. Measure voltage first to ensure that no hazardous voltage is present, then switch to Ohms. If the resistance is approximately 30 Ω or less, the Meter beeps. To turn off the beeper, press the beeper button. If the resistance is higher than 4000 Ω, >4000 Ω is displayed. acf07f.eps Measuring Voltage 1. 2. Connect the probes to the circuit to be measured.
MegOhmMeter Using the Meter Checking the Battery This function tests the battery under simulated load per EN61557. Disconnect all test leads from any circuit. acf09f.eps Full Empty 100% - Full 0% - Empty acf13f.eps Figure 4.
Fluke 1520 Users Manual Maintaining the Meter This section provides basic maintenance information, including fuse and battery replacement instructions. Caution Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. Cleaning Clean only with soap and water. Remove any residue afterwards. Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
MegOhmMeter Maintaining the Meter W Warning Replacing and Disposing of the Batteries To avoid electric shock, disconnect the test leads from the inputs before opening the Meter for battery replacement. G To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery empty indicator appears. Note This Meter contains alkaline batteries. Do not dispose of these batteries with other solid waste.
Fluke 1520 Users Manual 4. 5. 6. 7. 22 Place the Meter face down on a nonabrasive surface and loosen the two screws with a flat-blade screwdriver. Lift the battery access lid away from the Meter. Replace the C cells as shown in Figure 5. Observe the battery polarity shown in the battery compartment. Secure the battery access lid back in position with the two screws.
MegOhmMeter Maintaining the Meter acf10f.eps Figure 5. Replacing the Batteries.
Fluke 1520 Users Manual W Warning Testing and Replacing the Fuse To avoid electric shock, disconnect the test leads from the inputs before opening the Meter for fuse replacement. To prevent personal injury or damage to the Meter, install ONLY Fluke specified fuse identified in the “Replacement Parts and Optional Accessories” section. Before replacing the fuse, test it as described in the next section. Testing the Fuse e Use the following procedure to test the internal fuse of the Meter. 1.
MegOhmMeter Maintaining the Meter Replacing the Fuse W Warning To avoid electric shock, personal injury or damage to the Meter, use ONLY the specified fuse, and in accordance with the following procedure. If the previous fuse test indicates that the fuse is defective (resistance > 40 Ω), replace the fuse as follows: 1. Turn the rotary switch to the OFF position. 2. Disconnect test leads from any power source. 3.
Fluke 1520 Users Manual acf11f.eps Figure 6.
MegOhmMeter Replacement Parts and Optional Accessories Replacement Parts and Optional Accessories Replacement Part Battery 1.5 V Alkaline Size C Test Lead set Test Probe, 1 kV, lantern tip, red Test Probe, 1 kV, lantern tip, black Alligator Clip, red Alligator Clip, black Carrying Case Holster Hand Strap Fuse, 6 mm x 32 mm (0.25 x 1.25 inch), 0.5 A, 660 V, Fast Acting, 50 A Minimum Interrupt rating OR Fuse, 6 mm x 32 mm (0.25 x 1.25 inch), 0.
Fluke 1520 Users Manual Principle of Measurement for Resistance The Meter measures resistance by inducing a current in the circuit under test, measuring the resultant potential across the circuit, and then calculating the resistance of the circuit. The resistance is then established by performing the following calculation: R= V I (Ohm’s Law) Service Centers To locate an authorized service center, visit us on the World Wide Web: www.fluke.
MegOhmMeter Specifications Specifications Operating Temperature Storage Temperature Temperature Coefficient Environmental -10 °C to +50 °C -40 °C to +70 °C 0.
Fluke 1520 Users Manual Size Weight Drop requirement Shock and Vibration Electrical Safety Maximum Operating Voltage Protection Levels Immunity & Emmissions ESD 30 Mechanical Specifications 23,4 x 10 x 6,4 cm (9.2 x 3.9 x 2.5 in) 1 kg (2.2 lbs.
MegOhmMeter Specifications Electrical Specifications C Size 1.5 V alkaline, ANSI/NEDA-14A, IECLR14 (4 pieces) Fuse 6 mm x 32 mm (0.25 x 1.25 inch), 0.5 A 660 V, Fast Acting, 50 A Minimum Interrupt rating Insulation Resistance Display Ranges 4.000 MΩ, 40.00 MΩ, 400.0 MΩ, 4000 MΩ Measurement Range (per EN61557-2) 0.250 MΩ to 4000 MΩ Resolution 0.001 MΩ to 10 MΩ Accuracy 2 % + 2 counts 0.250 MΩ to 100.0 MΩ 10 % + 2 counts + 1 %/1000 MΩ 100.
Fluke 1520 Users Manual Test Voltages Accuracy Nominal Current Number of measurements Circuitry Protection 250 V, 500 V, 1000 V +20 %, -0 % 1 mA 5,000 test inhibited if ≥ 30 V ac or dc at inputs Lo Ω Display Range Measurement Range Accuracy Resolution Analog Bar Graph Open Circuit Voltage Short Circuit Current Test Leads Zero Number of measurements Circuitry Protection 32 40.00 Ω 0.10 Ω to 40.00 Ω 2 % + 2 counts 0.01 Ω 0 to 100 Ω 6 V typical 200 mA minimum, (0.2 to 2.
MegOhmMeter Specifications Voltage Range 600 V, dc, 50/60 Hz Resolution 1V Accuracy 2 % + 2 counts Analog Bar Graph 0 to 1000 V Range 4000 Ω Resistance Accuracy 2 % + 2 counts Resolution 1Ω Analog Bar Graph 0 to 10 kΩ Beeper On at ≈30 Ω or less 33
Fluke 1520 Users Manual Limited Warranty & Limitation of Liability Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days.
MegOhmMeter Specifications the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point). THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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