Fluke 333 Use and care manual

®
PN 1618765 June 2001
© 2001 Fluke Corporation. All rights reserved. Printed in U.S.A. 1
33X
ClampMeters
Calibration Information
Introduction
WWarning
To avoid electric shock or injury, do not perform the performance tests or
calibration procedures unless you are qualified to do so.
The information provided in this manual is for the use of qualified personnel
only.
The 33X Calibration Information provides the information necessary to verify the performance and adjust
the calibration of the Fluke 333, 334, 335, 336, and 337 ClampMeters, hereafter known as the Meter(s).
The following information is included in this document:
•Safety Information and International Electrical Symbols
•Specifications
•Replacing the Batteries
•Cleaning
•Performance Tests
•Calibration Adjustment
•User-Replaceable Parts and Accessories
•Warranty Statement
See the 33x Instruction Cards for complete operating instructions.
Contact Information
To contact Fluke, call:
1-888-99-FLUKE (1-888-993-5853) in USA
1-800-36-FLUKE (1-800-363-5853) in Canada
[phone] in Europe
[phone] Japan
[phone] Singapore
[phone] in other countries
For additional information about Fluke, its products, and services, visit Fluke’s web site at:
www.fluke.com
To register this product, go to www.fluke-warranty.com

33x
Calibration Information
2
Safety Information
WWarnings and Precautions
To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter
or the equipment under test, adhere to the following practices:
•Avoid working alone so assistance can be rendered.
•Never use the Meter on a circuit with voltages higher than 600 V or a frequency
higher than 400 Hz fundamental. The meter may be damaged.
•Do not use the Meter or test leads if they look damaged.
•Use extreme caution when working around bare conductors or bus bars. Contact
with the conductor could result in electric shock.
•Read the instruction card and safety sheet before use and follow all safety instructions.
•Use the Meter only as specified in the instruction card; otherwise, the Meter’s safety
features may be impaired.
•Use caution when working with voltages above 60 V dc or 30 V ac. Such voltages
pose a shock hazard.
•Before using the Meter, inspect the case. Do not use the Meter if it is damaged. Look for
cracks or missing plastic. Pay particular attention to the insulation around the connectors.
•Verify the Meter’s operation by measuring a known voltage. Do not use the Meter if it
operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced.
•Do not apply more than the rated current or voltage, as marked on the Meter.
•Use the proper terminals, function, and range for your measurements.
•Do not operate the Meter with the case (or part of the case) removed.
•When servicing the Meter, use only specified replacement parts.
International Electrical Symbols
The following international symbols appear in this document and on the Meter.
Risk of electric shock
Risk of danger. Important Information. See manual.
Equipment protected by double or reinforced Insulation
Battery
Conforms to CSA C22.2 No 1010. 2.032-96
Conforms to EU directives
Earth
DC measurement
AC measurement
N10140 Conforms to relevant Australian standards
Conforms to UL 3111-1 and UL 3111-2-032
Inspected and licensed by TÜV Product Services

ClampMeters
Specifications
3
Specifications
*These specifications apply
@ 23 °C ±5 °C, in relative
humidity of 0 - 90% 333 334 335 336 337
Range 0 - 400.00 A 0 - 600.0 A 0 - 999.9 A
Accuracy 2 % ±5 counts (50/60 Hz) 2 % ±5 counts (10 - 100 Hz)
6 % ±5 counts (10 - 400 Hz)
Crest
Factor
add 2% for
CF > 2
NA NA 2.4 @ 500 A
2.0 @ 600 A 3 @ 500 A 2.5 @ 600 A 3 @ 500 A 2.5 @ 600 A
1.42 @ 1000 A
?
(50 Hz/60 Hz)
AC
response Avg Rms
Inrush Current Integration
Time NA 100 ms
Range NA NA NA 0 - 600.0 A 0 - 999.9 AA
Accuracy NA NA NA 2 % ±5 counts
Range 0 - 600.00 VK
Accuracy 1 % ±5 counts
50/60 Hz 1 % ±5 counts (20 - 100 Hz) 6 % ±5 counts (100 - 400 Hz)
Range 0 - 600.0 VL
Accuracy 1 % ±5 counts
Range 0 - 600.0 Ω0 - 600.0 Ω
600 - 6000 Ω
e
Accuracy 1 % ±5 counts
Continuity R≤30 Ω
Range NA NA NA NA 5.0 - 400.0 HzHz-Amps Only
Trigger Level:
10-100 Hz ≥5 A
5-10 Hz,
100-400 Hz > 10 A
Accuracy NA NA NA NA 0.5 % ±5 counts
Storage
Temperature -40 °C to 60 °C
Operating
Temperature -10 °C to 50 °C
Altitude 2500 m
EMC- instrument unspecified for use in EMC field ≥0.5 V/m
CAT III 600 V, Pollution Degree II:
CAT III equipment is designed to protect against transients in equipment in fixed-equipment installations, such as
distribution panels, feeders and short branch circuits, and lighting systems in large buildings.
*< 18 °C,> 28 °C add 0.1 x (specified accuracy)/°C

33x
Calibration Information
4
Replacing the Batteries
WWarning
To avoid false readings, that could lead to possible electric shock or personal
injury, replace the batteries as soon as the low battery indicator ( b) appears.
Disconnect the test leads before replacing the batteries.
To replace the batteries (refer to Figure 1):
1. Turn the rotary switch to OFF and remove the test leads from the terminals.
2. Loosen the battery compartment door screw, and remove the door from the case bottom.
3. Remove the batteries.
4. Replace the batteries with 2 new AA batteries.
5. Reattach the battery compartment door to the case bottom and tighten the screw.
adc02f.eps
Figure 1. Replacing the Batteries
Cleaning
WWarning
To avoid electrical shock, remove any input signals before cleaning.
Caution
To avoid damaging the Meter, do not use aromatic hydrocarbons or chlorinated
solvents for cleaning. These solutions will react with the plastics used in the
instruments.
Clean the instrument case with a damp cloth and mild detergent.

ClampMeters
Performance Tests
5
Performance Tests
WWarning
To avoid electric shock, do not perform the performance test procedures unless
the Meter is fully assembled.
The following performance tests verify the complete operation of the Meter and check the accuracy of
each meter function against the Meter’s specifications. If the Meter fails any part of the test, calibration
adjustment and/or repair is indicated.
In the performance tests, the Meter is referred to as the unit under test (UUT).
Table 1. Required Equipment
Equipment Recommended Model
AC Calibrator Fluke 5520A
Digital Multimeter (DMM) Any Fluke model
50-Turn Current Coil Fluke 5500A/Coil
Testing the Display
For models 334 - 337, test the display by turning the Meter on while holding down the INRUSH button.
Check all segments for clarity and contrast. The 333 is not equipped with this feature. Refer to Figure 2.
OFF
V
A
V
INRUSH
ZERO MIN/MAX
AHz
On/Off
INRUSH
adc01f.eps
Figure 2. Testing the Display (337 is shown)

33x
Calibration Information
6
Backlight Test
The 334, 335, 336, and 337 Clampmeters are equipped with a display backlight. To test the backlight,
press s. The backlight will come on and the unit will beep. To turn off the backlight, press sa second
time. Refer to Figure 3.
OFF
V
OFF
V
adc03f.eps
Figure 3. Testing the Backlight
Keypad Test
To test the keypad, turn the Meter on and push each button separately. Each button push will cause the
Meter to beep.
Preparing for the Performance Test
WWarning
To avoid possible electric shock or personal injury:
•Do not perform the following procedures unless qualified to do so. Some
procedures involve the use of high voltages.
•Before handling the test connections and in between tests, make sure the
calibrator is in standby mode (STBY).
To prepare for the performance test:
1. Make sure that you have the required equipment, see Table 1.
2. Warm up the calibrator as required by its specifications.
3. Allow the temperature of the UUT to stabilize at room temperature ( 23 °C ±5 °C [73 °F ±9 °F] ).

ClampMeters
Performance Tests
7
Performance Test Procedure
To test each of the Meter’s functions and operating ranges, do the following:
1. Connect the source to the Meter’s VΩand COM input jacks.
2. Referring to Table 2, put the Meter in the desired function and range for each test.
3. Apply the indicated output from the source.
4. When using the amp function on the 5520A, make sure LCOMP on the 5520A is ON.
5. The reading on the Meter display should be within the low and high limits shown in the table.
6. Repeat steps 1-4 for each function and range in Table 2.
If the Meter fails to perform within the low-high range indicated for each test in Table 2, the Meter needs
to be calibrated and adjusted, or requires some repair.
5520A Calibrator
50-Turn Current Coil
Conductor
1000A
600V
CAT
TRUE RMS CLAMPMETER
337
OFF
V
A
V
Amps
AC
DC
Volts
INRUSH
ZERO MIN/MAX
Hz
MAXMIN
AHz
COM
600V
V
CAT
HOLD
adc07f.eps
Figure 4. 33x Amps/Hz Verification Setup

33x
Calibration Information
8
Table 2. Performance Tests 333, 334, 335
Meter Response
Test
(Switch Position) 5520A Output Lower Limit Upper Limit
20 V 50 Hz 19.3 V AC 20.7 V ACK
AC Volts 600 V 50 Hz 593.5 V AC 606.5 V AC
20 V 19.3 V DC 20.7 V DC
-20 V -19.3 V DC -20.7 V DC
600 V 593.5 V DC 606.5 V DC
L
DC Volts
-600 V -593.5 V DC -606.5 V DC
R
Continuity 25 ΩBeeper On
600 Ω590.5 Ω609.5 Ωe
Ohms 6 KΩ(334, 335) 5905 Ω6095 Ω
20 A 50 Hz 19.1 A AC 20.9 A AC
200 A 50 Hz (334, 335) 195.5 A AC 204.5 A AC
?
Amps AC
600 A 50 Hz (334, 335) 587.5 A AC 612.5 A AC
Inrush *5 A 60 Hz 4.4 A AC 5.6 A AC
* display should bar (- - - -), then show reading with inrush light on (334, 335)

ClampMeters
Performance Tests
9
Table 2. Performance Tests 336, 337 (cont.)
Meter Response
Test
(Switch Position) 5520A Output Lower Limit Upper Limit
20 V 50 Hz 19.3 V AC 20.7 V AC
600 V 50 Hz 593.5 V AC 606.5 V AC
K
AC Volts
600 V 400 Hz 563.5 V AC 636.5 V AC
600 V 400 Hz 563.5 V AC 636.5 V ACMin/Max (337)
20 V 400 Hz Reading does not change
20 V 19.3 V DC 20.7 V DC
-20 V -19.3 V DC -20.7 V DC
600 V 593.5 V DC 606.5 V DC
L
DC Volts
600 V -593.5 V DC -606.5 V DC
R
Continuity 25 ΩBeeper On
600 Ω590.5 Ω609.5 Ωe
Ohms 6 KΩ5905 Ω6095 Ω
20 A 50 Hz 19.1 A AC 20.9 A AC
200 A 50 Hz 195.5 A AC 204.5 A AC
200 A 400 Hz 187.5 A AC 212.5 A AC
600 A 50 Hz 587.5 A AC 612.5 A AC
?
Amps AC
900 A 50 Hz (337 only) 881.5 A AC 918.5 A AC
Inrush *5 A 60 Hz 4.4 A AC 5.6 A AC
0.0 A after button push -0.5 A DC 0.5 A DC
20.0 A 19.1 A DC 20.9 A DC
−20.0 A -19.1 A DC -20.9 A DC
600.0 A 587.5 A DC 612.5 A DC
-600.0 A -587.5 A DC -612.5 A DC
900.0 A (337) 881.5 A DC 918.5 A DC
A
DC Amps
-900.0 A (337) 881.5 A DC 918.5 A DC
5 A 10 Hz 9.4 Hz 10.6 HzFrequency (337)
10 A 300 Hz 298.0 Hz 302.0 Hz
*display should bar (- - - -), then show reading with inrush light on

33x
Calibration Information
10
Calibration Adjustment 333, 334, & 335
Use the following steps to adjust the calibration of the 333, 334, and 335 meters (refer to Figure 5):
1. Remove the 2 screw on the bottom of the Meter.
2. Lift off the top case.
3. Apply 600.0 V 50 Hz.
4. Adjust R12 until display reads within 1.0 V.
5. Apply 200.0 A 50 Hz (remove 600 Vac).
6. Adjust R15 until the display reads within 0.5 A.
7. Replace the top case.
8. Replace the case screws.
9. Verify the calibration by going through the performance test procedures.