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.
®
1520
MegOhmMeter
Users Manual
Table of Contents
Title Page
Unpacking the Meter......................................................................................... 1
Safety Information and Symbols....................................................................... 3
Key functions.................................................................................................... 6
Display.......................................................................................................... 8
Using the Meter ................................................................................................ 10
Connecting to the Circuit Under Test............................................................ 10
Auto-Shut-Off................................................................................................ 12
Measuring Insulation Resistance .................................................................. 12
Measuring Low Resistance........................................................................... 16
Measuring Resistance................................................................................... 18
Measuring Voltage........................................................................................ 18
Checking the Battery..................................................................................... 19
Maintaining the Meter....................................................................................... 20
Cleaning........................................................................................................ 20
Replacing and Disposing of the Batteries...................................................... 21
Testing and Replacing the Fuse.................................................................... 24
Replacement Parts and Optional Accessories .................................................. 27
Principle of Measurement for Resistance.......................................................... 28
Service Centers................................................................................................ 28
Specifications.................................................................................................... 29
i
ii
List of Tables
Table Title Page
1. Key and Switch Descriptions..................................................................... 6
2. Display Descri ption ................................................................................... 8
List of Figures
Figure Title Page
1. Shipment Content..................................................................................... 2
2. Display...................................................................................................... 9
3. Connecting to the Circuit Under Test........................................................ 11
4. Display Example....................................................................................... 19
5. Replacing the Batteries............................................................................. 23
6. Replacing the Fuse................................................................................... 26
ii
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 bl ack, 1.5 m
• 2 test probes, red and bl ack
• 2 alligator clips, red and black
• Hand strap
• Carrying case
• CD ROM (Not Pictured)
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Fluke 1520
Users Manual
Figure 1. Shipment Content
acf02f.eps
2
MegOhmMeter
Safety Information and Symbols
Safety Information and Symbols
A Caution identifi es conditions and actions that may damage the Meter. A WWarning
identifies conditions and actions that pose hazard(s) to the user. International symbols on
the Meter and in the manual ar e explained below.
Y
W
T
M
P
CAT III
Risk of electric shock
See manual
Equipment protected by double or
reinforced Insulation
Battery Recycling information
Conforms to CSA C22.2 No 1010.1-92 +
Amendment 2 1997, UL 3111 and
ANSI/ISA SP82.01 1994
Conforms to EU directives
OVERVOLTAGE (Installation) CATEGORY
refers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY
meter and primary over-current protection equipment.
,,,
is equipment in fixed installations (e.g., electricity
J
I
D
VDE
t
,,,
, Pollution Degree 2 per IEC1010-1
Earth
Fuse
AC or DC
Conforms to VDE
EN61010 (Pending)
Conforms to UL 3111.1
3
Fluke 1520
Users Manual
W
Safety Information
Use of instrument in a manner not specified by the manufact urer may impair
safety features/protection provided by the equipment. Read the following safety
information caref ully before using or servici ng 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.
• Be careful when working abo ve 30 V ac rms, 42 V ac peak and
60 V dc. Such voltages pose a shock hazard.
• When using the probes, keep your fingers away from probe contacts. Keep
your fingers behind the finger guards on the probes.
• Measurements can be adversely affected by impedances of additional
operating circuits connected in parallel or by t ransient currents.
• Verify operation prior to measuring hazardous voltages (voltages above 30 V
ac rms, 42 V ac peak and 60 V dc).
4
MegOhmMeter
Safety Information and Symbols
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Safety Information (cont.)
• Place test leads in pr oper input terminals.
• Disconnect the live t est lead before disconnect ing the neutral test lead.
• Do not use the Meter if the battery indicator (G ) shows a battery empty
condition.
• Use only Fluke recommend ed 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 l eads from power sources and from the Meter before
changing the batteri es or fuse.
• Do not use the Meter in a wet environment.
• Use only Fluke specifi ed test leads.
5
Fluke 1520
Users Manual
Key functions
Table 1. Key and Switch Descriptions
Rotary switch
To select a measurement function.
6
T
L
Used for the Insulation Resistance and Low Resistance test functi ons.
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
• Insulation Resistance- this mode continuously applies the test voltage
to the circuit to be tested. The beeper sounds every 2 seconds to
remind you that you are in the Lock mode.
• Low Resistance- this mode continuously applies the test current to the
circuit to be tested.
To unlock: press LOCK or TEST again.
V LOCK appears on the display.
N
Z
C
MegOhmMeter
Key functions
Table 1 (continued)
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.
Low Resistance function
Turns the test lead resistance compensation ON.
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
Turns the display backlight ON and OFF.
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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 Insulati on Resistance or Low
Resistance function.
4 Beeper symbol shows if beeper function is turned on in Resistance functi on.
5 Zero symbol is on if test leads are zeroed out.
6 Main reading display for all functions.
7 Analog bar graph displays resistance on a logarithmic scale and voltage on a linear
scale. The value always tracks the main reading.
8 High voltage warning symbol flashes if voltage ≥ 30 V ac or dc is present on the probes.
9
Battery life indicator. Displays briefly when the Meter is first switched to a function.
Displays the amount of battery voltage left in increment s of 25 %.
10 Lock symbol is on if the TEST mode is locked in Insulation or Low Resistance functions.
8
10
MegOhmMeter
Key functions
1 32
4
5
9
8
7
Figure 2. Display
6
acf12f.eps
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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
MegOhmMeter
Using the Meter
Figure 3. Connecting to the Circuit Under Test
acf04f.eps
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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 tur n the meter back on, turn t he rotary switch to
OFF, then to the desir ed function.
Measuring Insulation Resistance
W
Warning
• Measuring insulation resistance requires the application of potentially
dangerous voltages to the circuit. This may incl ude exposed bonded
metalwork.
• Before proceeding, ens ure that the installation is correctly wired and no
personnel are endangered by any tests.
12
MegOhmMeter
Using the Meter
To measure insulati on resistance, do the following:
1. Select the test voltage.
2. Connect the probes to t he circuit to be measure d.
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 proceeding with the next step.
3. Push and hold the TEST butt on. The upper left display shows the test vol tage applied
to the circuit under test. The main display shows the resistance.
Note
The display shows - - - - until the TEST button is pushed.
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Fluke 1520
Users Manual
The Meter beeps when the reading is stable. Th e upper right display s hows the same
resistance reading as the main display.
When resistance is higher than the maximum display range, the meter react s as
follows:
• If the 250V range is selected, the display r eads >1000 MΩ.
• If the 500V range, is selected, the displa y reads >2000 MΩ.
• If the 1000V range, is selected, the displ ay reads >4000 MΩ.
4. While keeping the probes on the test points, release the TEST button.
The circuit now disch arges through the Meter, while the main reading shows the
decreasing voltage.
Keep the probes touched to the test points u ntil the circuit is completely discharged
(the main display sho ws - - - -).
The upper right displ ay holds the resistance reading until a new test is started or a
different function is selected.
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MegOhmMeter
Using the Meter
Using the LOCK Function to Measure Insulation Resistance
The LOCK function holds t he test voltage on the probes. Use LOCK to make long durat ion
measurements without having to push and hol d the TEST button.
To use the LOCK function:
1. Press the TEST button, then press the LOCK button, and then release bot h
simultaneously.
W
Warning
In this mode a potentially dangerous voltage is continuously applied to t he
probes.
In this mode, if the probes are disconnected from th e circuit, the Meter
cannot discharge any potentially dangerous capacitive voltages left on the
circuit.
Caution
In this mode the Meter cannot indicate if the circui t is live.
Ensure that the circuit is de-energized before connecting the test probes i n
this mode.
2. Press LOCK or TEST to disengage the lock functi on.
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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 t he circuit to be measure d.
If voltage is prese nt on the probes, the vol tage is displayed.
W
Warning
A repetitive beep and the flashing high voltage
symbol (Y) warn the user if voltage more than 30 V ac
acf06f.eps
or dc is present. If the vol tage is > 30 V ac or dc,
remove the voltage fr om the circuit under test before
proceeding with the next step.
3. Press and hold the TEST but ton. A single beep indi cates a stable reading. The
resistance shows on the main display. If the resistance is high er than 40 Ω, >40 Ω is
displayed.
4. Release the TEST button. The upper right displ ay holds the resistance reading until a
new test is started or a different function is selected.
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MegOhmMeter
Using the Meter
5. Exchange the red (+) and black (-) probes on the circuit and r epeat steps 3 and 4 to
reverse the polari ty 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 pol arities.
Using the LOCK Function to Measure Resistance
The LOCK function is used to continuously supply the test current to the circuit to be tested.
This is useful for making several measurem ents in succession without having to push and
hold the TEST button for each measurement.
1. Press the TEST button, then press the LOCK button, then release both simultaneously.
2. You can now probe the desir ed test locations i n succession.
3. Press LOCK or TEST to disengage the lock functi on.
Caution
The Meter cannot indicate if the circuit is live in this mode.
Ensure that the circuit is de-energized before connecting the test probes i n
this mode or the fuse may blow.
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Fluke 1520
Users Manual
Measuring Resistance
1. Connect the probes to t he circuit to be measure d.
Measure voltage fi rst to ensure that no hazardous voltage is
present, then switch to Ohms.
2. If the resistance is approximately 30 Ω or less, the Meter
beeps. To turn off t he beeper, press the beeper button. If the
resistance is high er than 4000 Ω, >4000 Ω i s displayed.
Measuring Voltage
1. Connect the probes to t he circuit to be measure d.
2. If the voltage is higher than 660 V, >660 V is displayed.
W
Warning
The Meter indicates either ac or dc voltage. If the
voltage being measured has both an ac and dc
component, the Meter di splays only the largest
component of the measured signal.
18
acf07f.eps
acf08f.eps
Checking the Battery
This function tests the battery under simulated load per
EN61557. Disconnect all test leads from any circuit.
Full
Empty
100% - Full
0% -
Empty
MegOhmMeter
Using the Meter
acf09f.eps
Figure 4. Display Example
acf13f.eps
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Fluke 1520
Users Manual
Maintaining the Meter
This section provi des basic maintenanc e information, incl uding fuse and battery
replacement instructions.
Caution
Do not attempt to repair or service your Meter unless you ar e qualified to do
so and have the relevant cal ibration, 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.
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MegOhmMeter
Maintaining the Meter
Replacing and Disposing of the Batteries
W
Warning
To avoid electric shock, disconnect the test l eads from the inputs before
opening the Meter for battery replacement.
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.
G
Note
This Meter contains alkaline batteries. Do not dispose of these batteries with other solid
waste. Used batteries should be disposed of by a qualified recycler or hazardous
materials handler. Contact your authorized Fluke Service center for recyc l i n g
information.
The Meter uses four alkaline C cell batteri es (supplied). To repl ace the batteries, do the
following (see Figure 5):
1. Turn the rotary switch to t he OFF position.
2. Disconnect test leads from any power source.
3. Remove the holster.
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Fluke 1520
Users Manual
4. Place the Meter face dow n on a nonabrasive surface and loosen the two s crews with a
flat-blade screwdriver.
5. Lift the battery access lid away from the Meter.
6. Replace the C cells as shown in Figure 5. Observe the battery polarity shown in the
battery compartment.
7. Secure the battery ac cess lid back in posit ion with the two screws.
22
MegOhmMeter
Maintaining the Meter
Figure 5. Replacing the Batteries.
acf10f.eps
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Fluke 1520
Users Manual
Testing and Replacing the Fuse
W
Warning
To avoid electric shock, disconnect the test l eads from the inputs before
opening the Meter for fuse replacement.
To prevent personal injury or damage to the Meter, install ONLY Fluke
specified fuse ident ified in the “Replacement Parts and Optional
Accessories” secti on.
Before replacing t he fuse, test it as descr ibed in the next section.
Testing the Fuse
Use the following procedure to test the int ernal fuse of the Meter .
1. Turn the rotary switch to the Lo e Function.
2. Connect the test leads to the input terminal s and short them
together. Press TEST.
3. The display should indicate approximately 0.5 Ω. If the
display reads >40 Ω, replace the fuse as described next and
test again.
24
acf06f.eps
MegOhmMeter
Maintaining the Meter
Replacing the Fuse
W
Warning
To avoid electric shock, personal injury or damag e to the Meter, use ONLY
the specified fuse, an d in accordance with the f o llowing procedure.
If the previous fus e test indicates that the fuse is defective ( resistance > 40 Ω), replace the
fuse as follows:
1. Turn the rotary switch to t he OFF position.
2. Disconnect test leads from any power source.
3. Follow Steps 2 - 5 to remove the battery access li d as described under "Replacing and
Disposing of the Batter ies".
4. Unscrew the bottom cover as shown in Figure 6.
5. Remove the fuse as shown in Fig ure 6.
6. Replace with a new fuse.
7. Place the bottom cover on and secure the screws.
8. Insert the batteries. Observe the battery polarity shown in the battery compartment.
9. Secure the battery ac cess lid.
10. Test the fuse as described under "Testing t he Fuse".
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Fluke 1520
Users Manual
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Figure 6. Replacing the Fuse
acf11f.eps
Replacement Parts and Optional Accessories
Replacement Parts and Optional Accessories
Replacement Part Part Number
Battery 1.5 V Alkaline Size C 423582
Test Lead set 669058
Test Probe, 1 kV, lantern tip, red 803459
Test Probe, 1 kV, lantern tip, black 803467
Alligator Clip, red 803434
Alligator Clip, black 803442
Carrying Case 603115
Holster 670643
Hand Strap 669069
W
Fuse, 6 mm x 32 mm (0.25 x 1.25 inch), 0.5 A, 660 V, Fast Acting,
50 A Minimum Interrupt rating
W
Fuse, 6 mm x 32 mm (0.25 x 1.25 inch), 0.5 A, 750 V, Fast Acting
Optional Accessories Part Number
Harness 669074
Tool Pack 669903
W
For safety, use exact replacement only.
OR
MegOhmMeter
NA
1556096
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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 pote ntial across the circuit, and then calcul ating the resistanc e of the circuit.
The resistance is t hen established by performing the following calculation:
V
R =
(Ohm’s Law)
I
Service Centers
To locate an authori zed service center, vi sit us on the World Wide Web:
www.fluke.com
or call Fluke using an y of the phone numbers listed below:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-678-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
28
Specifications
Environmental
Operating Temperature -10 °C to +50 °C
Storage Temperature -40 °C to +70 °C
Temperature Coefficient 0.10 x (specified accuracy)/ °C
(< 18 °C or > 28 °C)
Relative Humidity:
Non condensing (< 10 °C)
90 % RH (10 °C to 30 °C)
75 % RH (30 °C to 40 °C)
45 % RH (40 °C to 50 °C)(Without Condensation)
Dust/water resistance IP42 per IEC 529
Operating Altitude 2000 m
Storage Altitude 12000 m
MegOhmMeter
Specifications
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Fluke 1520
Users Manual
Mechanical Specifications
Size 23,4 x 10 x 6,4 cm
(9.2 x 3.9 x 2.5 in)
Weight 1 kg (2.2 lbs.)
Drop requirement Per IEC 1010-1
Shock and
Vibration
Electrical Safety Meets all requirements of EN61010-1, 1995 and EN61557, 1997
Maximum
Operating Voltage
Protection Levels CAT
Immunity &
Emmissions
ESD EN61000-4-2 Satisfies Criteria B
Conforms to MIL-PREF-28800F class 3 & 4
Safety Specifications
600 V ac or dc between any terminal and earth ground
,,,
, 600 V, Pollution Degree 2 per EN61010-1
Electromagnetic Compatibility (EMC)
EN 61326-1
(Unspecified for Field strength in excess of 2V/m)
30
MegOhmMeter
Specifications
Electrical Specifications
Battery C Size 1.5 V alkaline, ANSI/NEDA-14A, IECFuse 6 mm x 32 mm (0.25 x 1.25 inch), 0.5 A 660 V,
Insulation Resistance
Display Ranges 4. 000 MΩ, 40.00 MΩ, 400.0 MΩ, 4000 M Ω
Measurement Range (per EN61557-2) 0.250 MΩ to 4000 MΩ
Resolution 0.001 MΩ to 10 MΩ
Accuracy
Analog Bar Graph 0 to ∞
LR14 (4 pieces)
Fast Acting, 50 A Minimum Interrupt rating
2 % + 2 counts
0.250 MΩ to 100.0 MΩ
10 % + 2 counts + 1 %/1000 MΩ
100.0 MΩ to 4000 MΩ
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Fluke 1520
Users Manual
Test Voltages 250 V, 500 V, 1000 V
Accuracy +20 %, -0 %
Nominal Current 1 mA
Number of measurements 5,000
Circuitry Protection test inhibited if ≥ 30 V ac or dc at inputs
Lo Ω
Display Range 40.00 Ω
Measurement Range 0.10 Ω to 40.00 Ω
Accuracy 2 % + 2 counts
Resolution 0.01 Ω
Analog Bar Graph 0 to 100 Ω
Open Circuit Voltage 6 V typical
Short Circuit Current 200 mA minimum, (0.2 to 2.0 Ω for >20%
Test Leads Zero 2 Ω
Number of measurements 5,000
Circuitry Protection test inhibited if ≥ 30 V ac or dc at inputs
battery capacity remaining).
32
Voltage
Range 600 V, dc, 50/60 Hz
Resolution 1 V
Accuracy 2 % + 2 counts
Analog Bar Graph 0 to 1000 V
Resistance
Range 4000 Ω
Accuracy 2 % + 2 counts
Resolution 1 Ω
Analog Bar Graph 0 to 10 kΩ
Beeper On at ≈30 Ω or less
MegOhmMeter
Specifications
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. This warranty extends only to the original buyer or enduser customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries or to any
product which, in Fluke’s opinion, has been misused, altered, neglected, contaminated, or damaged by
accident or abnormal conditions of operation or handling. Fluke warrants that software will operate
substantially in accordance with its functional specifications for 90 days and that it has been properly
recorded on non-defective media.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user
customers only but have no authority to extend a greater or different warranty on behalf of Fluke.
Warranty support is available if product is purchased through a Fluke authorized sales outlet or Buyer
has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs
of repair/replacement parts when product purchased in one country is submitted for repair in another
country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge
repair, or replacement of a defective product which is returned to a Fluke authorized service center
within the warranty period.To obtain warranty service, contact your nearest Fluke authorized service
center to obtain return authorization information, then send the product to that service center, with a
description of the difficulty, postage and insurance prepaid (FOB Destination), to the nearest Fluke
authorized service center. Fluke assumes no risk for damage in transit. Following warranty repair, the
product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that the
failure was caused by neglect, misuse, contamination, alteration, accident or abnormal condition of
operation or handling, including overvoltage failures caused by use outside of the product’s specified
rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs
and obtain authorization before commencing the work. Following repair, the product will be returned to
34
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. FLUKE SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS
OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdi ction, su ch holding will not affect the validity or enforceability of an y
other provision.
11/99
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
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Fluke 1520
Users Manual
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