Fluke 1535 Use and care manual

August 2017
©2017 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.
Specifications are subject to change without notice.
1535/1537
Insulation Tester
Calibration Manual

LIMITED WARRANTY AND LIMITATION OF LIABILITY
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.
This warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or
abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf. To obtain
service during the warranty period, 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 problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE,
ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the exclusion or
limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to you.
11/99
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
China Service Center
Rm 101, 1/F, Tong Heng Tower
No. 4 Hua Yuan Road,
Hai Dian District, Beijing
100088, P.R.C.
Hotline: [phone]

i
Title Page
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How to Contact Fluke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Principle of Measurement and Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Equipment and Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Calibration Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Battery Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table of Contents

ii
1535/1537
Calibration Manual

1
Introduction
XW Warning
To prevent electric shock or personal injury, do not perform the calibration
verification tests or calibration procedures described in this manual unless
you are qualified to do so. The information provided in this manual is for the
use of qualified personnel only.
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.
For complete operating instructions, refer to the Users Manual at www.fluke.com.
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
• Technical Support China: [phone]
• Calibration/Repair 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]
Or, visit Fluke's website at www.fluke.com.
To register your product, visit http://register.fluke.com.
To view, print, or download the latest manual supplement, visit http://us.fluke.com/usen/support/manuals.

1535/1537
Calibration Manual
2
Safety Information
A Warning identifies hazardous conditions and procedures that are dangerous to the user. A Caution
identifies conditions and procedures that can cause damage to the Product or the equipment under test.
XW Warning
To prevent possible electrical shock, fire, or personal injury:
• Carefully read all instructions.
• Read all safety information before you use the Product.
• Do not alter the Product and use only as specified, or the protection supplied by
the Product can be compromised.
• Do not use the Product around explosive gas, vapor, or in damp or wet
environments.
• Do not use the Product if it is altered or damaged.
• Disable the Product if it is damaged.
• Do not use the Product if it operates incorrectly.
• Use Product-approved measurement category (CAT), voltage, and amperage
rated accessories (probes, test leads, and adapters) for all measurements.
• Do not exceed the Measurement Category (CAT) rating of the lowest rated
individual component of a Product, probe, or accessory.
• 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. Use personal protective
equipment (approved rubber gloves, face protection, and flame-resistant
clothes) to prevent shock and arc blast injury where hazardous live conductors
are exposed.
• Examine the case before you use the Product. Look for cracks or missing
plastic. Carefully look at the insulation around the terminals.
• Do not use test leads if they are damaged. Examine the test leads for damaged
insulation, exposed metal, or if the wear indicator shows. Check test lead
continuity.
• Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.
• Do not apply more than the rated voltage, between the terminals or between
each terminal and earth ground.
• Measure a known voltage first to make sure that the Product operates correctly.
• Limit operation to the specified measurement category, voltage, or amperage
ratings.
• The battery door must be closed and locked before you operate the Product.
• Connect the common test lead before the live test lead and remove the live test
lead before the common test lead.
• Remove all probes, test leads, and accessories before the battery door is
opened.
• Remove all probes, test leads, and accessories that are not necessary for the
measurement.
• Keep fingers behind the finger guards on the probes.
• Replace the batteries when the low battery indicator shows to prevent incorrect
measurements.
• Use the correct terminals, function, and range for measurements.

Insulation Tester
Safety Information
3
• Place test leads in proper input terminals.
• Do not work alone.
• 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.
• Results of measurement can be adversely affected by the impedances of
additional operating circuits connected in parallel or by transient currents.
• Before and after testing, confirm that the Tester does not indicate the presence
of a hazardous voltage. If a hazardous voltage is shown on the display, remove
power from the circuit under test or allow the installation capacitance to fully
discharge.
• Do not disconnect the test leads before a test has been completed and the test
voltage at the terminals has returned to zero. This ensures that any charged
capacitance is fully discharged.
• Use the guard terminal only as specified in this manual. Do not allow other
foreign objects coming into contact with the guard terminals as safety may be
compromised
• Remove the input signals before you clean the Product.
• Use only specified replacement parts.
• Repair the Product before use if the battery leaks.
• Be sure that the battery polarity is correct to prevent battery leakage.
• Do not operate the Product with covers removed or the case open. Hazardous
voltage exposure is possible.
• Have an approved technician repair the Product.

1535/1537
Calibration Manual
4
Symbols used on the Product and in this manual are explained in Table 1.
Table 1. Symbols
Symbol Description
XWARNING. HAZARDOUS VOLTAGE. Risk of electric shock.
WWARNING. RISK OF DANGER.
Consult user documentation.
China metrology certification mark for measuring instruments manufactured in the People’s Republic of China
(PRC).
PConforms to European Union directives.
Battery
RContinuity test or continuity beeper tone. (1537 only)
TDouble Insulated
6WARNING. Do not apply greater than 660 Volts.
Interference is present. Displayed value might be outside of specified accuracy.
步进 Ramp mode indicator
Electrical breakdown
Both direct and alternating current
Earth
Measurement Category III is applicable to test and measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.
Measurement Category IV is applicable to test and measuring circuits connected at the source of the
building’s low-voltage MAINS installation.
~This product complies with the WEEE Directive marking requirements. The affixed label indicates that you
must not discard this electrical/electronic product in domestic household waste. Product Category: With
reference to the equipment types in the WEEE Directive Annex I, this product is classed as category 9
"Monitoring and Control Instrumentation" product. Do not dispose of this product as unsorted municipal waste.

Insulation Tester
General Specifications
5
General Specifications
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.5 mm x 104 mm
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 x AA alkaline IEC LR6
Dimensions (H x W x L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 mm x 211 mm x 93 mm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 kg
Temperature
Operating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-10 °C to +50 °C
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 °C to +60 °C
Operating Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Non condensing (<10 °C)
≤80 % RH (at 10 °C to 30 °C)
≤50 % RH (at 30 °C to 50 °C)
Altitude
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 m
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 000 m
Overvoltage Category. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CAT IV 600 V
Safety
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IEC 61010-1: Pollution Degree 2
IEC 61010-2-033: CAT IV 600 V
IEC 61557-1
Insulation Resistance Measurement. . . . . . . . . . . . . . . . . IEC 61557-2
Effectiveness of the Protective Measures. . . . . . . . . . . . . IEC 61557-16
Intrusion Protection (IP) Rating . . . . . . . . . . . . . . . . . . . . . IEC 60529: IP40
Electromagnetic Compatibility (EMC)
International . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IEC 61326-1: Portable Electromagnetic Environment
IEC 61326-2-2 CISPR 11: Group 1, Class A
Group 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the
internal function of the equipment itself.
Class A: Equipment is suitable for use in all establishments other than domestic and those directly connected to a low-voltage power
supply network that supplies buildings used for domestic purposes. There may be potential difficulties in ensuring electromagnetic
compatibility in other environments due to conducted and radiated disturbances.
Caution: This equipment is not intended for use in residential environments and may not provide adequate protection to radio
reception in such environments.
Number of Insulation Resistance Measurements
Un (V) Rload (Ω) Number of Measurements
250 V 250 kΩ6500
500 V 500 kΩ3800
1000 V 1 MΩ2200
2500 V 2.5 MΩ1300

1535/1537
Calibration Manual
6
Electrical Specifications
The Tester’s accuracy is specified for 1 year after calibration at operating temperatures of 10 °C to 30 °C.
For operating temperatures outside the range (-10 °C to +10°C and +30 °C to +50 °C), add ±0.25 % per °C
for 5 % bands, add ±1 % per °C for 20 % bands.
Insulation Resistance Measurement
Test Voltage Range Resolution Accuracy
250 V
<200 kΩunspecified unspecified
200 kΩto 500 kΩ1 kΩ5 %
0.50 MΩto 5.00 MΩ10 kΩ5 %
5.0 MΩto 50.0 MΩ100 kΩ5 %
50 MΩto 500 MΩ1 MΩ5 %
0.50 GΩto 5.00 GΩ10 MΩ5 %
5.0 GΩto 50.0 GΩ500 MΩ20 %
>50 GΩunspecified unspecified
500 V
<200 kΩunspecified unspecified
200 kΩto 500 kΩ1 kΩ5 %
0.50 MΩto 5.00 MΩ10 kΩ5 %
5.0 MΩto 50.0 MΩ100 kΩ5 %
50 MΩto 500 MΩ1 MΩ5 %
0.50 GΩto 5.00 GΩ10 MΩ5 %
5.0 GΩto 10.0 GΩ100 MΩ5 %
10.0 GΩto 50.0 GΩ500 MΩ20 %
50 GΩto 100 GΩ5 GΩ20 %
>100 GΩunspecified unspecified

Insulation Tester
Electrical Specifications
7
Insulation Resistance Measurement
Test Voltage Range Resolution Accuracy
1000 V
<200 kΩunspecified unspecified
200 kΩto 500 kΩ1 kΩ5 %
0.50 MΩto 5.00 MΩ10 kΩ5 %
5.0 MΩto 50.0 MΩ100 kΩ5 %
50 MΩto 500 MΩ1 MΩ5 %
0.50 GΩto 5.00 GΩ10 MΩ5 %
5.0 GΩto 20.0 G 100 MΩ5 %
20.0 GΩto 50.0 G 500 MΩ20 %
50 GΩto 200 GΩ5 GΩ20 %
>200 GΩunspecified unspecified
2500 V
<200 kΩunspecified unspecified
200 kΩto 500 kΩ1 kΩ5 %
0.50 MΩto 5.00 MΩ10 kΩ5 %
5.0 MΩto 50.0 MΩ100 kΩ5 %
50 MΩto 500 MΩ1 MΩ5 %
0.50 GΩto 5.00 GΩ10 MΩ5 %
5.0 GΩto 50.0 GΩ100 MΩ5 %
50 GΩto 500 GΩ5 GΩ20 %
>500 GΩunspecified unspecified
Bar graph range: 0 Ωto 1 TΩ
Insulation test voltage accuracy: -0 %, +10 % at 1 mA load current
Charging rate for capacitive load: 5 s/μF
Discharge rate for capacitive load: 1.5 s/μF
Function Range Accuracy
Leakage Current Measurement 1 nA to 2 mA ±(20 % + 2 nA)
Capacitive Measurement 0.01 μF to 2.00 μF±(15 % of reading + 0.03 μF)
Insulation Resistance Test Voltage 250 V to 2500 V ±(3 % + 3 V)
Function Range Resolution
Timer 0 to 99 minutes Setting: 1 minute
Indication: 1 second

1535/1537
Calibration Manual
8
Short circuit current
1535 . . . . . . . . . . . . . . . . . . . . . . . . . .>2 mA
1537 . . . . . . . . . . . . . . . . . . . . . . . . . .>5 mA
Live circuit warning Warning Range
>30 V
VAC / VDC / Resistance Measurement (1537 Only)
Function Range Resolution Accuracy
±(% reading + Digits)
VAC 0 V to 600.0 V 0.1 V ±(2 % +10)
(45 Hz to 500 Hz)
VDC 0 V to 600.0 V 0.1 V ±(2 % +10)
Resistance
0 Ωto 600.0 Ω0.1 Ω
±(2 % +10)
600 Ωto 6000 Ω1 Ω
6.00 kΩto 60.00 kΩ10 Ω
Operating Ranges and Uncertainties per EN 61557
Function Display Range
EN 61557
Measurement Range
Operating Uncertainty
±(% reading + Digits)
Nominal Values
V
EN 61557-1[1]
0 V ac to 600 V ac
45 Hz to 500 Hz
0 V ac to 600 V ac
±(2 % +10 digits)
UN= 230/400 V ac
f = 50/60 Hz
RISO
EN 61557-2 0 kΩto 500 GΩ200 kΩto 500 GΩ±20 % UN= 250 / 500 / 1000 / 2500 V dc
IN= 1.0 mA
[1] 1537 only
Operating Uncertainties per EN 61557
Parameter Specification Typical Max[1]
Intrinsic uncertainty IEC 61557-2
A, Reference conditions 1.63 % 3.68 %
Position IEC 61557-2
E1, Reference Conditions ±90 °2.29 % 5.00 %
Supply Voltage
IEC 61557-2
E2, At low battery voltage stated by
manufacture
2.80 % 6.09 %
Temperature IEC 61557-2
E3, 0 °C and 35 °C3.36 % 9.83 %
Operating
Uncertainty
IEC 61557-2
B, ≤30 % 7.30 % 18.17 %
[1] Confidence level: 95 %.

Insulation Tester
Principle of Measurement and Resistance
9
Principle of Measurement and Resistance
The Tester uses these formulas to measure insulation parameters and display the results:
Equipment and Environment
Before you start the verification procedures or make calibration adjustments, refer to this section for the
equipment, system, and setup requirements.
See Table 2 for a list of requirements for the verification tests and calibration adjustment.
Ohm’s Law
Capacitance (Charge)
PI (Polarization Index)
DAR (Dielectric Absorption Ratio)
DD (Dielectric Discharge) I= current after 1-minute discharge
V= voltage at moment before discharge
C= measured object capacitor
Table 2. Equipment Requirements
Equipment Description Recommended
Model
Used on:
Verification
Tests Calibration Adjustment
High Voltage Meter 3 kV, ±1 % Fluke 5320A and
Fluke 8846 XX
Current Source 1 nA to 50 nA, ±5 %
50 nA to 400 μA, ±1 % Keithley 6220 X
Capacitors 0.1 μF, 3 kV, ±10 %
2 μF, 3 kV, ±10 % WIMA SNMKP Series XX
Calibrator
DC voltage: -600 V to 600 V
Accuracy: ±0.5 %
AC voltage: 0 V to 600 V
45 Hz to 500 Hz
Accuracy: ±0.5 %
OHM: 0 kΩ to 60 kΩ
Accuracy: ±0.5 %
Fluke 5522A XX
Resistors 200 kΩto 50 GΩ, 3 kV, ±1 %
500 GΩ, 3 kV, ±5 %
Combinations of:
OHMITE Slim-Mox Series
and Ultra-Mox Series X
PC With serial communication
software Recommended software: Tera Term X
USB Cable (1537 only) USB A to mini B Fluke PN 4499448 X
Probe Fixture (1535 only) See Figure 1. X
RV
I
---=
CQ
V
----=
PI R10min
R1min
----------------=
DAR R1min
R15s
--------------=
DD I
VC×
-------------=

1535/1537
Calibration Manual
10
Figure 1. 1535 to Probe Fixture Connection
Calibration Procedure
The recommended calibration cycle for this product is 1 year. Or, calibrate the Product if it fails any
performance test in the verification procedure.
Before you do the calibration:
1. Make sure that you have the required equipment. See Table 2.
a. For 1537, make sure the Product battery is good or replace it if necessary.
b. For 1535, remove the batteries and calibration seal of the unit under test (UUT) and reassemble the UUT on
the probe fixture and power up the fixture.
2. Make sure the USB driver is correctly installed on the PC:
a. For 1537, connect the unit under test (UUT) to PC with the USB cable.
b. For 1535, connect the probe fixture to PC with USB cable.
3. Use proper serial communication software to send calibration commands, set the baud rate to
9600 bps. Set up the software and make sure a “carriage return” byte and a “line feed” byte are sent
after each command.
4. Warm up the Calibrator as necessary. Refer to the specifications of the Calibrator.
5. Let the temperature of the unit under test (UUT) become stable to room temperature.
3.3 V UART
GND
RXD_IN
TXD_OUT
12V+
GND

Insulation Tester
Calibration Procedure
11
To do the calibration:
1. Turn on the meter.
2. To check the connection, use the PC and serial communication software to enter these commands:
3. To calibrate the Current function, use the PC and serial communication software to enter these commands:
Command Operation / Purpose Response
id Check the connection and unit ID The ID information of UUT
Command Operation / Purpose Response
Connect the current source between E and G
cal start_current Enter Current calibration mode “cal start_current”
irs 4 Enter 200 nA range “irs”
Current source outputs -1 nA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 0
-0.001 ADC_READ Write the calibration parameter 0, use read value ADC_READ in the previous step “current param”
Current source outputs -5 nA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 1
-0.005 ADC_READ Write the calibration parameter 1, use read value ADC_READ in the previous step “current param”
Current source outputs -50 nA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 2
-0.05 ADC_READ Write the calibration parameter 2, use read value ADC_READ in the previous step “current param”
Current source outputs -150 nA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 3
-0.15 ADC_READ Write the calibration parameter 3, use read value ADC_READ in the previous step “current param”
irs 3 Enter 2 μA range “irs”
Current source outputs -250 nA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 4
-0.25 ADC_READ Write the calibration parameter 4, use read value ADC_READ in the previous step “current param”
Current source outputs -1.5 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 5
-1.5 ADC_READ Write the calibration parameter 5, use read value ADC_READ in the previous step “current param”
irs 2 Enter 20 μA range “irs”
Current source outputs -2.5 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 6
-2.5 ADC_READ Write the calibration parameter 6, use read value ADC_READ in the previous step “current param”
Current source outputs -19 μA

1535/1537
Calibration Manual
12
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 7
-19 ADC_READ Write the calibration parameter 7, use read value ADC_READ in the previous step “current param”
irs 1 Enter 200 μA range “irs”
Current source outputs -25 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 8
-25 ADC_READ Write the calibration parameter 8, use read value ADC_READ in the previous step “current param”
Current source outputs -190 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 9
-190 ADC_READ Write the calibration parameter 9, use read value ADC_READ in the previous step “current param”
irs 0 Enter 2 mA range “irs”
Current source outputs -250 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 10
-250 ADC_READ Write the calibration parameter 10, use read value ADC_READ in the previous step “current param”
Current source outputs -400 μA
adc i r Read the Current analog-to-digital conversion value ADC_READ “current_adc”
cal_param current 11
-400 ADC_READ Write the calibration parameter 11, use read value ADC_READ in the previous step “current param”
cal stop_current Stop the Current calibration “cal stop_current”
cal_param save Save the calibration parameters “params saved”

Insulation Tester
Calibration Procedure
13
4. To calibrate the PWM function, use the PC and serial communication software to enter these commands:
Command Operation / Purpose Response
Connect the high voltage meter between L and G
cal start_pwm Enter PWM calibration mode “cal start_pwm”
pwm 0 Set PWM ratio to 0 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 0
0V_READ ADC_READ
Write the calibration parameter 0, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 7.3 Set PWM ratio to 7.3 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 1
7.3 V_READ ADC_READ
Write the calibration parameter 1, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 69.5 Set PWM ratio to 69.5 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 2
69.5 V_READ ADC_READ
Write the calibration parameter 2, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 71.3 Set PWM ratio to 71.3 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 3
71.3 V_READ ADC_READ
Write the calibration parameter 3, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 73.0 Set PWM ratio to 73.0 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 4
73.0 V_READ ADC_READ
Write the calibration parameter 4, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 74.8 Set PWM ratio to 74.8 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 5
74.8 V_READ ADC_READ
Write the calibration parameter 5, use measured
value V_READ and read value ADC_READ in the
previous two steps “pwm param”
pwm 76.5 Set PWM ratio to 76.5 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ

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Calibration Manual
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adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 6
76.5 V_READ ADC_READ
Write the calibration parameter 6, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 78.2 Set PWM ratio to 78.2 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 7
78.2 V_READ ADC_READ
Write the calibration parameter 7, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 79.9 Set PWM ratio to 79.9 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 8
79.9 V_READ ADC_READ
Write the calibration parameter 8, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 81.5 Set PWM ratio to 81.5 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 9
81.5 V_READ ADC_READ
Write the calibration parameter 9, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 83.1 Set PWM ratio to 83.1 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 10
83.1 V_READ ADC_READ
Write the calibration parameter 10, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 84.7 Set PWM ratio to 84.7 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 11
84.7 V_READ ADC_READ
Write the calibration parameter 11, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
pwm 86.2 Set PWM ratio to 86.2 % “pwm adjusted”
Measure the L-G voltage by the high voltage
meter, the measured (in Volts) is V_READ
adc hv r Read the HV analog-to-digital conversion value ADC_READ “pwm_volt_adc”
cal_param pwm 12
86.2 V_READ ADC_READ
Write the calibration parameter 12, use measured
value V_READ and read valueADC_READ in the
previous two steps “pwm param”
cal stop_pwm Stop the PWM calibration “cal stop_pwm”
cal_param save Save the calibration parameters “params saved”

Insulation Tester
Calibration Procedure
15
5. To calibrate the Capacitance function, use the PC and serial communication software to enter these
commands:
6. To calibrate the VDC function, use the PC and serial communication software to enter these commands:
Command Operation / Purpose Response
Connect the 2 μF capacitor between L and E
cal start_capacitor Enter Capacitor calibration mode “cal start_capacitor”
Wait 6 seconds at least
misc capacitor_finished Query whether or not the capacitor calibration
process is finished, if not finished, do this step again “yes finished”
misc capacitor_coef Query calibrated coefficient CAP_COEF
cal_param capacitor CAP_COEF Write coefficient “capacitor param”
cal stop_capacitor Stop the Capacitor calibration “cal stop_capacitor”
cal_param save Save the calibration parameters “params saved”
Command Operation / Purpose Response
Connect the calibrator between E and G (use VDC
function)
cal start_dmm_vdc Enter VDC calibration mode “cal start_dmm_vdc”
Calibrator outputs 0 V
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vdc_adc”
cal_param dmm_vdc 0
0 ADC_READ Write the calibration parameter 0, use read value ADC_READ in the previous step “dmm_vdc param”
Calibrator outputs 600 V
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vdc_adc”
cal_param dmm_vdc 1 600
ADC_READ Write the calibration parameter 1, use read value ADC_READ in the previous step “dmm_vdc param”
cal stop_dmm_vdc Stop the VDC calibration “cal stop_dmm_vdc”
cal_param save Save the calibration parameters “params saved”

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Calibration Manual
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7. To calibrate the VAC function (1537 only), use the PC and serial communication software to enter these
commands:
Command Operation / Purpose Response
Connect the calibrator between E and G (use VAC
function)
cal start_dmm_vac Enter VAC calibration mode “cal start_dmm_vac”
Calibrator outputs 10 V 50 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 0
10 ADC_READ Write the calibration parameter 0, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 400 V 50 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 1
400 ADC_READ Write the calibration parameter 1, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 200 V 100 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 2
200 ADC_READ Write the calibration parameter 2, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 200 V 200 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 3
200 ADC_READ Write the calibration parameter 3, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 200 V 300 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 4
200 ADC_READ Write the calibration parameter 4, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 200 V 400 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 5
200 ADC_READ Write the calibration parameter 5, use read value ADC_READ in the previous step “dmm_vac param”
Calibrator outputs 200 V 500 Hz
adc vac_vdc r Read the Voltage analog-to-digital conversion value ADC_READ “dmm_vac_vdc”
cal_param dmm_vac 6
200 ADC_READ Write the calibration parameter 6, use read value ADC_READ in the previous step “dmm_vac param”
cal stop_dmm_vac Stop the VAC calibration “cal stop_dmm_vac”
cal_param save Save the calibration parameters “params saved”