Fluke 1520 Use and care manual

®
1520
MegOhmMeter
Calibration Manual
PN 1592594
November 2000
© 2000 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

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 end-user 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 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 jurisdiction,
such holding will not affect the validity or enforceability of any other provision.
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
11/99

i
Table of Contents
Title Page
Introduction........................................................................................................ 1
Contacting Fluke................................................................................................ 2
Precautions and Safety Information................................................................... 2
International Symbols.................................................................................... 2
Specifications..................................................................................................... 4
Required Equipment .......................................................................................... 6
Performance Test............................................................................................... 7
Display Test................................................................................................... 7
Backlight Test................................................................................................ 8
Battery Test ................................................................................................... 8
Discharge Circuit Test................................................................................... 8
Volts and Ohms Measurement Accuracy Verification.................................. 8
LO Ohms Measurement Accuracy Verification............................................ 9
Meg Ohm Measurement Accuracy Verification............................................ 9
Meg Ohm Voltage Source Accuracy Verification......................................... 11
Maintaining the Meter........................................................................................ 12
Cleaning......................................................................................................... 12
Replacing and Disposing of the Batteries...................................................... 12
Testing and Replacing the Fuse..................................................................... 13
Replacement Parts and Optional Accessories.................................................... 15

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Calibration Manual
ii

iii
List of Tables
Table Title Page
1. International Symbols ............................................................................................ 2
2. Required Equipment............................................................................................... 6
3. Display Icons.......................................................................................................... 7
4. Volts and Ohms Test.............................................................................................. 8
5. Lo Ohms Test......................................................................................................... 9
6. Meg Ohm Test........................................................................................................ 10
7. Meg Ohm Voltage Source Test.............................................................................. 11

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Calibration Manual
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v
List of Figures
Figure Title Page
1. Display ................................................................................................................... 7
2. Replacing the Batteries........................................................................................... 13
3. Replacing the Fuse................................................................................................. 14

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Calibration Manual
vi

1
Introduction
WWarning
To avoid shock or injury, do not perform the verification tests
or calibration procedures described in this manual unless you
are qualified to do so.
The information provided in this document is for the use of
qualified personnel only.
Caution
The 1520 MegOhmMeter contains parts that can be damaged by
static discharge.
Follow the standard practices for handling static sensitive
devices.
The information in this manual deals with the Fluke 1520 MegOhmMeter, (hereafter
referred to as “the Meter”). Information provided includes:
•Precautions and safety information
•Specifications
•Basic maintenance (cleaning, replacing the battery and fuses)
•Performance test procedures
•Accessories and replaceable parts
For complete operating instructions, refer to the 1520 Users Manual PN 1543203.

1520
Calibration Manual
2
Contacting Fluke
To order accessories, receive assistance, or locate the nearest Fluke distributor or Service
Center, call:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]
Address correspondence to:
Fluke Corporation Fluke Europe B.V.
P.O. Box 9090, P.O. Box 1186,
Everett, WA 98206-9090 5602 BD Eindhoven
USA The Netherlands
Visit us on the World Wide Web at: www.fluke.com
Precautions and Safety Information
WWarning
If this product is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.
Read the “Safety Information”page before servicing this product.
In this manual, a Warning identifies conditions and actions that pose hazard(s) to the
user; a Caution identifies conditions and actions that may damage the Meter or the test
instruments.
International Symbols
International symbols used on the Meter and in this manual are explained in Table 1.
Table 1. International Symbols
Risk of electric shock JEarth
See manual IFuse
Equipment protected by double or reinforced
insulation DAC or DC
Battery Recycling information
Conforms to CSA C22.2 No 1010.1-92 + Amendment
2 1997, UL 3111 and ANSI/ISA SP82.01 1994 VDE Conforms to VDE EN61010 (Pending)
Conforms to EU directives tConforms to UL 3111.1
CAT
III OVERVOLTAGE (Installation) CATEGORY III, Pollution Degree 2 per IEC1010-1 refers to the level of
Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY III is equipment
in fixed installations (e.g., electricity meter and primary over-current protection equipment.

MegOhmMeter
Precautions and Safety Information
3
WSafety 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.
•Be careful when working above 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
transient currents.
•Verify operation prior to measuring hazardous voltages
(voltages above 30 V ac rms, 42 V ac peak and 60 V dc).
•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 from the
Meter before changing the batteries or fuse.
•Do not use the Meter in a wet environment.
•Use only Fluke specified test leads.

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Calibration Manual
4
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
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 Conforms to MIL-PREF-28800F class 3 & 4
Safety Specifications
Electrical Safety Meets all requirements of EN61010-1, 1995 and
EN61557, 1997
Maximum Operating Voltage 600 V ac or dc between any terminal and earth
ground
Protection Levels CAT ,,,, 600 V, Pollution Degree 2 per EN61010-1
Electromagnetic Compatibility (EMC)
Immunity & Emmissions EN 61326-1
(Unspecified for Field strength in excess of 2V/m)
ESD EN61000-4-2 Satisfies Criteria B
Electrical Specifications
Battery C Size 1.5 V alkaline, ANSI/NEDA-14A, IEC-LR14
(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

MegOhmMeter
Specifications
5
Insulation Resistance
Display Ranges 4.000 MΩ, 40.00 MΩ, 400.0 MΩ, 4000 MΩ
Measurement Range (per EN61557-2) 0.250 MΩto 4000 MΩ
Resolution 0.001 MΩto 10 MΩ
2 % + 2 counts
0.250 MΩto 100.0 MΩ
Accuracy
10 % + 2 counts + 1 %/1000 MΩ
100.0 MΩto 4000 MΩ
Analog Bar Graph 0 to ∞
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 Ωto 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 Ωfor >20% battery
capacity remaining).
Test Leads Zero 2 Ω
Number of measurements 5,000
Circuitry Protection test inhibited if•30 V ac or dc at inputs
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 Ωor less

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Calibration Manual
6
Required Equipment
Required equipment is listed in Table 2. If the recommended models are not available,
equipment with equivalent specifications may be used.
Repairs or servicing should be performed only by qualified personnel.
Caution
Do not attempt to use the 5500A or other standard calibrator for insulation and
continuity resistance tests. Calibrator damage will result.
Table 2. Required Equipment
Equipment Minimum Required Characteristics Recommended Model
Calibrator AC Voltage Range: 0-600 Vac
Accuracy: + 0.5 %
Frequency Range: DC –60 Hz
Accuracy: +3 %
DC Voltage Range: 0-600 Vdc
Accuracy: + 0.5 %
Ohms Range: 0 Ω- 4000Ω
Accuracy: + 0.5 %
Insulation Resistance: 250 kΩ, 500 kΩ, 1 MΩ,
80 MΩ
Accuracy: + 0.5%
Continuity Resistance: 2 Ohms, 20 Ohms
Accuracy: + 0.5%
9100 w/135 option
HV Divider DC Voltage Range: 1 kV –5 kV
Accuracy: + 1%
Division Ratio: 1000:1
Input resistance: 1000 MΩ
Fluke 80K-40
DMM DC Voltage Range: 1 –1000 Vdc
Accuracy: + 0.25% Fluke 87-3

MegOhmMeter
Performance Test
7
Performance Test
WWarning
While performing the following procedures, there are potentially
dangerous voltages at the Meter output terminals when the
Meter is in the MΩfunction.
The following performance tests will ensure that the meter is in proper operating
condition and meets the published accuracy specifications. If the Meter fails any of the
performance test steps, repair is needed.
To perform the tests you will need equipment meeting the minimum specification given
in Table 2.
Display Test
While turning the Meter on, push and hold down the beeper button. Compare the display
with the example in Figure 1. Check all segments for clarity and contrast.
1 32
6
7
9
10
8
45
acf12f.eps
Figure 1. Display
Table 3. Display Icons
AVoltage applied to the probes in Insulation Resistance function.
BLow Resistance/Resistance function indicator.
CResistance reading held from the last measurement in Insulation Resistance or Low Resistance
function.
DBeeper symbol shows if beeper function is turned on in Resistance function.
EZero symbol is on if test leads are zeroed out.
FMain reading display for all functions.
GAnalog bar graph displays resistance on a logarithmic scale and voltage on a linear scale. The
value always tracks the main reading.
HHigh voltage warning symbol flashes if voltage ≥30 V ac or dc is present on the probes.
IBattery life indicator. Displays briefly when the Meter is first switched to a function. Displays the
amount of battery voltage left in increments of 25 %.
JLock symbol is on if the TEST mode is locked in Insulation or Low Resistance functions.

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Calibration Manual
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Backlight Test
Push the backlight button and note that the all three backlight LEDs come on. Each LED
can be seen on the left side of the display as an intensified area.
Battery Test
Turn the Rotary Switch to the Battery Check position and note that the batteries have
90% or better charge. Replace if necessary. Refer to "User Maintenance" for detailed
instructions on changing the batteries.
Discharge Circuit Test
The following Discharge Circuit Test is a safety related test that verifies input jack wiring
to the PCA, the RSOB contacts, RSOB pads on the PCA, and other active components on
the PCA.
Caution
DO NOT push the Meter TEST button during the following
procedure.
1. Connect the DMM to the VΩand COM jack of the Meter.
2. Set the DMM to kΩfunction.
3. Turn the Meter Rotary Switch to the 250V, 500V, 1000V and Lo Ωposition. Check
that the DMM reading for each position is between 1600 and 2600 Ω.
Volts and Ohms Measurement Accuracy Verification
To verify accuracy of the V and Ωfunction, complete the following:
Perform the battery test and replace as necessary
1. Connect the Calibrator to the VΩand COM inputs on the Meter.
2. Turn the Meter Rotary Switch to the function listed for each step of Table 4.
3. Apply the input for the steps 1 through 10 as listed in Table 4.
4. Compare the Meter displayed reading with the display limits of Table 4.
5. DISCONNECT THE CALIBRATOR FROM THE METER.
Table 4. Volts and Ohms Test
Display Reading
Step Function Source Output Lower Limit Upper Limit
1 Volts 0 Volts -2 2
2 Volts 180 V 174 186
3 Volts 540 V 527 553
4 Volts 180 V @ 60 Hz 174 186
5 Volts 540 V @ 60 Hz 527 553
6Ω0 Ω02
7Ω1200 Ω(UTTi High) 1174 1226
8Ω3600 Ω(UUTi High) 3526 3674
9ΩOpen >4000 >4000
10 Continuity on 27 ΩBeeper on Beeper on

MegOhmMeter
Performance Test
9
LO Ohms Measurement Accuracy Verification
Caution
During the following tests, the 9100 source output must be
applied to the UUT prior to pushing the UUT TEST button.
Failure to do this WILL damage the 9100.
Do not attempt to use the 5500A or other standard calibrator for
the following test. Calibrator Damage will result.
Use the calibrator continuity resistance function to verify accuracy of the LO Ωfunction
as follows:
1. Turn the Meter Rotary Switch to LO Ω.
2. Connect the calibrator to the Meter VΩand COM input terminals using 4 wire test
leads.
3. Apply zero ohms from the calibrator.
4. Zero the LO ohms function (press and release the TEST button and then press and
hold the ZERO button until the Meter beeps).
5. Apply the Calibrator Output values listed in Table 5 and compare the Meter reading
with the display reading limits given.
Table 5. Lo Ohms Test
Display Reading Limits
Step Function Calibrator Output Lower Limit Upper Limit
1 LO Ohms 2 Ohms 1.94 2.06
2 LO Ohms 20 Ohms 19.58 20.42
Meg Ohm Measurement Accuracy Verification
Use the calibrator Insulation Resistance function to verify MΩmeasurement accuracy as
follows:
Caution
During the following tests the 9100 source output must be
applied to the UUT prior to pushing the UUT TEST button.
Failure to do this WILL damage the 9100.
Do not attempt to use the 5500A or other standard calibrator for
the following test. Calibrator Damage will result.

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Calibration Manual
10
WWarning
Pushing the TEST button produces a potentially dangerous
voltage, at the Meter output terminals, when the Meter is in the
MΩfunction.
1. Turn the Meter Rotary Switch to the MΩfunction and set the Meter range as listed in
Table 6.
2. Apply the calibrator output values listed in step 1 of Table 6.
3. Press and hold the Meter TEST button until the Meter display reading settles to its
final value.
4. Compare the Meter displayed reading with the display reading limits of Table 6.
5. Release the TEST button.
6. Repeat the above process for all remaining steps in Table 6.
Table 6. Meg Ohm Test
Display Reading
Step Function Range Calibrator Output Lower Limit Upper Limit
1MΩ250 V 250 kΩ243 257
2MΩ500 V 250 kΩ243 257
3MΩ1000 V 250 kΩ243 257
4MΩ250 V 500 kΩ488 512
5MΩ500 V 500 kΩ488 512
6MΩ1000 V 500 kΩ488 512
7MΩ250 V 1 MΩ0.978 1.022
8MΩ500 V 1 MΩ0.978 1.022
9MΩ1000 V 1 MΩ0.978 1.022
10 MΩ250 V 80 MΩ78.2 81.8
11 MΩ500 V 80 MΩ78.2 81.8
12 MΩ1000 V 80 MΩ78.2 81.8
13 MΩ250 V Open >1000 >1000
14 MΩ500 V Open >2000 >2000
15 MΩ1000 V Open >4000 >4000

MegOhmMeter
Performance Test
11
Meg Ohm Voltage Source Accuracy Verification
To verify MΩVoltage Source Accuracy complete the following procedure:
WWarning
Pushing the TEST button produces a potentially dangerous
voltage, at the Meter output terminals, when the Meter is in the
MΩfunction.
1. Connect the DMM, listed in Table 2, to the Meter VΩand COM input terminals. Set
the DMM to the VDC function.
2. Turn the Meter Rotary Switch to the MΩfunction and range listed in Table 7, step 1.
3. Press and hold the TEST button until the Meter reading settles to its final value.
4. Compare the DMM reading with the display reading limits of Table 7.
5. Release the TEST button.
6. Repeat the above process for Table 7, Step 2.
7. Disconnect the DMM from the Meter and connect the HV Divider to the DMM.
8. Connect the DMM, with HV Divider, to the Meter VΩand COM input terminals.
9. Press and hold the TEST button until the Meter reading settles to its final value.
10. Compare the DMM display reading with the display reading limits of Table 7,
step 3.
Table 7. Meg Ohm Voltage Source Test
Display Reading
Step Function Range Measurement Device Lower Limit Upper Limit
1MΩ250 V Test DMM 250 300
2MΩ500 V Test DMM 500 600
3MΩ1000 V Test DMM with HV Divider 1.000 1.200

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Calibration Manual
12
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.
Replacing and Disposing of the Batteries
WWarning
To avoid electric shock, disconnect the test leads 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 G appears.
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 recycling information.
The Meter uses four alkaline C cell batteries (supplied). To replace the batteries, do the
following (see Figure 2):
1. Turn the rotary switch to the OFF position.
2. Disconnect test leads from any power source.
3. Remove the holster.
4. Place the Meter face down on a nonabrasive surface and loosen the two screws with a
flat-blade screwdriver.
5. Lift the battery access lid away from the Meter.
6. Replace the C cells as shown in Figure 2. Observe the battery polarity shown in the
battery compartment.
7. Secure the battery access lid back in position with the two screws.