Milwaukee CALIBRATION 2238-20 Operating instructions

MILWAUKEE ELECTRIC TOOL CORPORATION – TEST & MEASUREMENT PRODUCT
REPAIR SERVICE INSTRUCTIONS — CALIBRATION
2238-20 Clamp Meter for HVAC/R
Environmental
Condition
Perform all calibration at an ambient temperature of 23°C ± 2°C / 73.4°F ± 3.6°F and relative
humidity of 80% - allow the fork meter to sit at this temperature for a minimum of 30
minutes before proceeding.
REPAIR SERVICE
INSTRUCTIONS
Calibration
MILWAUKEE ELECTRIC TOOL CORPORATION
13135 WEST LISBON ROAD ●BROOKFIELD, WISCONSIN 53005-2550 ●USA
58-92-2238d1 04/2010
2239-20 Clamp Meter

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STNETNOCFOELBAT Page
Introduction 1
Precautions and Safety Information 1
Symbols 1
Safety 2
Specifications 3
General Specifications 3
Functional Description 3
Voltage Specifications 4
Current Specifications 4
Resistance Specifications 4
Continuity Specifications 4
Capacitance Specifications 4
Temperature Specifications 5
Hertz Specification 5
Physical and Environment Characteristics 6
Certification and Compliance 6
Basic Maintenance 6
Inserting and Removing the Battery 6
Maintenance - continued 7
Performance Tests 7
Testing the Display 7
Calibration Procedure: 2238-20 8
Calibration Procedure: 2238-20 - continued 9
Calibration Procedure: 2239-20 10
Calibration Procedure: 2239-20 - continued 11

1
Introduction
WARNING
To avoid shock or injury, do not perform the verification tests or calibration procedures
described in the manual unless you are qualified to do so.
The information provided in this document is for the use of qualified personnel only.
CAUTION
The 2238-20 and 2239-20 contain parts that can be damaged by static discharge.
Follow the standard practices for handling static sensitive devices.
Precautions and Safety Information
Use the Meter only as described in the Operator’s Manual. If you do not do so, the protection provided
by the Meter 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.
The Symbols
The symbols used on the Meter and in this manual are explained in Table 1.
Table A. The Symbols
Risk of electric shock
See instruction card
DC measurement
Equipment protected by double or
reinforced insulation
Battery
Earth
AC measurement
Resistance
DC Current
Capacitance
Continuity
Temperature
Application around and removal from hazardous
live conductors is permitted.
Conforms to EU directives
Underwriters Laboratories, Inc.
United States and Canada
Do not discard this product or throw away.
A
++
CUS

2
SAFETY
Review the following safety precautions to avoid injury and prevent damage to this product or
products connected to it. To avoid potential hazards, use the product only as specified.
CAUTION: These statements identify conditions or practices that could result in damage to
the equipment or other property.
WARNING: These statements identify conditions or practices that could result in personal
injury or loss of life.
Specific precautions
Do not operate without covers. To avoid personal injury, do not apply any voltage or current to
the product without covers in place.
Electric overload. Never apply a voltage to a connector on the product that is outside the range
specified for that connector.
Avoid electric shock. To avoid injury or loss of life, do not connect or disconnect probes or test
leads from the meter while they are connected to a voltage source.
Do not operate in wet/damp conditions. To avoid electric shock, do not operate this product in
wet or damp conditions.
To reduce the risk of injury, user must read and understand operator’s manual.

3
SPECIFICATIONS
All specifications are warranted unless noted typical and apply to the 2238-20 and 2239-20.
Stated accuracies are at 23°C±5°C at than 80% relative humidity and without the battery
indicator displayed.
General specifications
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Overrange display Display "OL" when the reading exceeds
range by 10%
Low voltage indicator is indicated
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12 V Lithium-Ion Milwaukee Battery Pack
49-11-2401, 49-11-2402
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Maximum input voltage 1000V CAT lll between IV and COM
Maximum floating voltage 1000V CAT lll between any terminal and earth
ground
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1. Current sensing jaws
2. NCVD sensing area
3. NCVD indicator
4. °F/°C button (2238-20)
Zero button (2239-20)
5. Inrush button (2239-20)
Cat. No.
2238-20
Cat. No.
2239-20
6. Rotary Dial
7. Display
8. Hold button
9. Min/Max button
10. Worklight LED
11.Jaw opening trigger
12. Terminal inputs
2
4
11
12
6
10
8
7
5
3
9
6
1
FUNCTIONAL DESCRIPTION

4
Measurement Specifications
Accuracy is ±(% reading + number of digits) at 23°C ± 5°C, less than 80% R.H.
Temperature coefficient: 0.1 * (Specified accuracy)/°C, <18°C, >28°C
(1) DC Voltage
Range Resolution Accuracy
600V 0.1V
1000V 1V
±(2% reading + 2 digits)
(2) AC Voltage
Range Resolution Accuracy (Sine Wave)
600V 0.1V
1000V 1V
±(1.2% reading + 5 digits) (50/60 Hz)
(3) DC μA (2238-20 only)
600.0μA 0.1μA ±(1.5% reading + 5 digits)
±(1.8% reading + 5 digits)
(45~500 Hz)
(4) AC Current
Range Resolution Accuracy
(5) Resistance
Range Resolution Accuracy
600 Ω/6k Ω/60 kΩ/600 kΩ 0.1 Ω/1 Ω/10 Ω/0.1 kΩ
(6) Continuity
Range Resolution Accuracy
Continuity Buzzer
600.0Ω
2238-20:
60/600A 0.01/0.1A ±1.9% rdg ± 5dgt (50/60Hz)
±3.0% rdg ± 5dgt (45-500Hz)
2239-20: * Add 2% at CF>2
60/600/1000A 0.01/0.1/1A
±1.0% rdg ± 2dgt
Buzzer sounds at 30Ω or less
(7) Capacitance
0.1μF/1μF
Range Resolution Accuracy
±2.5% ±20dgt
up to 60
μF
400μF / 4000μF
Range Resolution Accuracy
0.1Ω

5
(8) Temperature (2238-20)
(9) Hertz (2239-20)
-40ºC ~ 538ºC
-40ºF ~ 1000ºF
(10) Volt Sense
Volt Sense Light should be on at 90V @ 1 inch (2.54 cm).
(11) Thermocouple
K Type Class II Thermocouple with standard dual banana jack.
Measurement Range: -40.0°C ~ 260.0°C (-40.0°F ~ 500.0°F)
Accuracy: ±2.5°C
(12) Over-range Indication
Display “OL” when the reading exceeds the measuring range.
(13) Rotary Switch
In order to prevent a “0” reading, the contacts about the input signal must be made properly
before the contact of the function selection.
(14) Auto Power Off
Meter automatically turns power off after powering up and no operation for 20 ±5 minutes.
Press any key or rotate the rotary to power up.
Range Resolution Accuracy
0.1°C
0.1ºF
±1% ±10dgt
±1% ±18dgt
(15) Battery: Milwaukee 12 V Lithium-Ion Battery Pack: 49-11-2401, 49-11-2402
(16) Battery life:
Approx. 12 hours with all functions
(17) Overvoltage Category
IEC/EN 61010-1 2nd edition for measurement CAT lll, 1000V; CAT lV, 600V
(18) Operating Temperature
-10°C to 50ºC (14ºF to 122ºF)
(19) Storage Temperature
-40°C to 60ºC (-40º to 140ºF) (No batteries)
ACA: 600 Hz, 6 kHz
ACV: 600 Hz, 6 kHz, 60 kHz
Range Resolution Accuracy
±1%rdg ±1dgt
Sensitivity: Amps 5A RMS;
Volts - 30V RMS
Minimum Hz measurement is 10Hz
0.1 Hz, 1 Hz, 10 Hz

6
Physical and Environmental Characteristics
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Vibration & shock Operating MIL-PRF-28800F for Class 2 Instrument
Indoor Use
Certifications and compliances
SafetyDesigned to IEC61010-1, UL61010-1 and CSA specifications
Category Ill 1000V.
Input rating
CAT IV : The source of the Low-Voltage installation.
CAT III : Distribution level mains, fixed installation.
CAT II : Local level mains, appliances, portable equipment
Over voltage category
CAT I : Signal level, special equipment or parts of equipment,
telecommunication, electronics.
Pollution Degree 2 Do not operate in environments where conductive
Pollutants may be present.
Basic Maintenance
WARNING
To avoid shock, disconnect test leads from any voltage source than remove from meter before
opening the case or replacing the battery.
Inserting/Removing the Battery
To remove the battery, use a flat screwdriver
to pry open the lock latch. Push in the release
buttons and pull the battery pack away from
the tool.
Lock latch
Fig. 1
To insert the battery, slide the pack into the
body of the tool. Make sure it latches securely
into place. Press in the lock latch to lock the
battery in place.

7
Performance Tests
The following performance tests verify the complete operability of the Meter and check the
accuracy of each Meter function against the Meter’s specifications.
Accuracy specifications are valid for a period of one year after calibration, when measured at an
operating temperature of 18°C to 28°C and a maximum of 80% relative humidity.
To perform the following tests, it is not necessary to open the case, no adjustments are necessary,
merely make the required connections, apply the designated inputs, determine if the reading on the
Meter display falls within the acceptable range indicated.
If the Meter fails any of these tests, it needs calibration adjustment or repair.
Testing the Display
Press “HOLD” key while turning the Meter on from the “OFF” position to hold the display in the
Display Test Mode. Compare the display with the example in Figure 2. Turn off the meter to
escape the test mode.
LCD Graphics 2238-20
Figure 2 Display Test
Maintenance - continued
To reduce the risk of personal injury and damage, never immerse your tool, battery pack or
charger in liquid or allow a liquid to flow inside them.
Maintaining Tool
Keep your tool, battery pack and charger in good repair by adopting a regular maintenance program.
After six months to one year, depending on use, return the tool, battery pack and charger to a
MILWAUKEE service facility for service. If the tool does not start or operate at full power with a fully
charged battery pack, clean the contacts on the battery pack. If the tool still does not work properly,
return the tool, charger and battery pack, to a MILWAUKEE service facility for repairs.
Cleaning
Clean dust and debris from charger and tool vents. Keep tool handles clean, dry and free of oil or grease.
Use only mild soap and a damp cloth to clean the tool, battery pack and charger since certain cleaning
agents and solvents are harmful to plastics and other insulated parts. Some of these include gasoline,
turpentine, lacquer thinner, paint thinner, chlorinated cleaning solvents, ammonia and household deter-
gents containing ammonia. Never use flammable or combustible solvents around tools.
WARNING

8
Calibration Procedures: 2238-20
Mode：M2238 True RMS Clamp Meter for HVAC/R
Environmental：Temperature 18°C ~ 28°C Humidity：<70%RH
CC aalliibbrraattiioonn eeqquuiippmmeenntt
：：11..
FLUKE 5520A 22..FLUKE 5500A/COIL(50TURNS) 33..MM22223388 Fixture
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NOTE:
(1) Turn the unit off. Press and hold “ + ” keys and turn the function dial
to range “ ” then push “°F/°C ” button within 2 sec. The LCD will blink “ZERO”
Step Function Switch Position Input Signal Adjustment Adjust Range Note
1. DCV Adjustment 300VDC VR1 299.9~300.1V
2. ACV Zero Adjustment Open Circuit VR2 0.0~0.1V (1)
3. ACV Adjustment 300V/60Hz (sine wave) VR3 299.9~300.1V
4. DCuA Adjustment
300uADC VR4 299.9~300.1uA
5. ACA 600A Adjustment 300A/60Hz VR5 299.9~300.1A
6. ACA 60AAdjustment 30A/60Hz VR6 29.99~30.01A
7. Capacitor Adjustment 220uF Soft Key 218.0~222.0 (2)
8. Capacitor Adjustment 2200uF Soft Key 2180~2220 (3)
9. Temp. Adjustment
0mVDC Soft Key --- (4)
10. Temp. Adjustment 16.395mVDC Soft Key --- (5)
11. Temp. Adjustment
0°C Soft Key -0.1~0.1°C (6)
12.
13.

9
symbol to indicate the software forced zero is disabled and the actual
reading is now displayed so the operator can adjust the real AD zero. Wait
around 1 minute the reading will stop falling and the operator can adjust
VR2 to null the number. Check the adjusting result stay at zero and turn
the unit off to finish the adjusting.
(2) Turn the unit off. Press and hold “ + ” keys and turn the function
dial to range “ ” then push “°F/°C” button within 2 sec. The LCD will blink
“INRUSH” symbol. Input 220uF signal to the terminal then press “ ”
button to write the calibration data into the unit.
(3) Continue from note (2). Press “ ” button to switch unit to 4000
uF range.
Input 2200uF signal to the terminal then press “ ”
button to write the
calibration data into the unit. Check
220uF and 2200uF again. If reading
is correct, turn off the unit to complete the calibration procedure.
(4) Turn the unit off. Press and hold “ + ” buttons and turn the function
dial to range “ ” then press “°F/°C” button within 2 sec. The LCD will blink
“ZERO” symbol. Input 0mV to the input terminals then press “ ” button to
write in the calibration data.
(5) Continue process in note (4). Input 16.395mV to the input terminals then
press “ ” to write in the calibration data.
(6) Continue process in note (5). Press “ ” button and the LCD will blink
“ ” symbol. Input 0°Csignal
to the input terminals and press “ ” button
the write in the calibration data. Check the reading. If the reading is correct,
turn the unit off to complete the process.
Ω
Calibration Procedures 2238-20 - continued

10
Calibration Procedures: 2239-20
Mode：M2239 True RMS AC/ DC clamp meter
Environmental：Temperature 18°C ~ 28°C Humidity：<70%RH
C alibration equipment：：11.. FLUKE 5520A 22..FLUKE 5500A/COIL(50TURNS)
33..MM22223388 FF iixxttuurree 44..Screw adjustment probe
Note:
(1) Turn the unit off. Press and hold “ + ” keys and turn the function dial
to range “ ” then push “
INRUSH” button within 2 sec. The LCD will blink “ZERO”
symbol to indicate the software forced zero is disabled and the actual reading is
now displayed so the operator can adjust the real AD zero. Wait
Step Function Switch Position Input Signal Adjustment Adjust Range Note
1. DCV Adjustment 300VDC VR2 299.9~300.1V
2. ACV Zero Adjustment Open Circuit VR4 0.0~0.1V (1)
3. ACV Adjustment 300V/60Hz (sine wave) VR3 299.9~300.1V
4. ACABalanceAdjustment 20A/60Hz (sine wave)
VR5 X±0.03A (2)
5. DCA ZeroAdjustment Open Circuit VR6 -0.03~0.03A
6. ACA 60AAdjustment 30A/60Hz VR8 29.99~30.01A
7. ACA 600AAdjustment 300A /60Hz VR7 299.9~300.1A
8. ACAINRUSHAdjustment +INRUSH 300A/60Hz VR1 299.0 ~301.0A (3)
9. Capacitor Adjustment 220uF Soft Key 218.0~222.0 (4)
10. Capacitor Adjustment 2200uF Soft Key 2180~2220 (5)
11.
12.
13.
14.
15.

11
around 1 minute the reading will stop falling and the operator can adjust VR4
to null the number. Check the adjusting result stay at zero and turn the unit off
to finish the adjusting.
(2) X represents the reading when the wire is at the center of the jaw.
(3) Repeat the procedure of getting “INRUSH” reading then adjust VR1 to make
the reading within the acceptable range.
(4) Turn the unit off. Press and hold “ + ” keys and turn the function dial
to range “ ” then push “
INRUSH ” button within 2 sec. The LCD will blink
“INRUSH” symbol. Input 220uF signal to the terminal then press “ ” button
to write the calibration data into the unit.
(5) Continue from note (4). Press “ ” button to switch unit to 4000
uF range.
Input 2200uF signal to the terminal then press “ ”
button to write the
calibration data into the unit. Check
220uF and 2200uF again. If the
reading is correct, turn off the unit to complete the calibration procedure.
Calibration Procedures 2239-20 - continued