Fluke 30 Service Information

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Clamp Meter

Service Information

WWarning

Do not service the Meter unless you are qualifi ed to do so. The service information provided in this document is for the use of qual ified personnel only.

To avoid electrical shock or personal injury: Al w ays remove the test leads and input signals from the Meter bef ore openi ng t he case.

Use caution when working with vol t ages above 60V dc or 30V ac.

WWarning

To avoid false readings, which could l ead t o possi ble electric shock or personal injury, replace the battery as soon as the bat tery indicator appears.

Y Caution

The Meter is protected throughout by double insulati on or rei nf orced insulation. When servicing the Meter, use only specified replacement parts.

This Meter contains parts that can be damaged by stat i c discharge. Follow the standard practices for handling stati c sensitive devices.

Introduction

This document covers the following topics relating to the calibration of the Fluke 30 Clamp Meter, hereafter referred to as the meter:

• Required Test Equipment

• Assembly/Reassembly

• Calibration Adjustments

• Performance Check

Service

To contact Fluke, call one of the following telephone numbers: USA and Canada: 1-888-99-FLUKE (1-888-993-5853)

Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65Anywhere in the world: +1-425-356-5500

Or, visit Fluke's Web site at www.fluke.com. To order replacement parts, call 1-800-526-4731.

Outside U.S.A. contact your nearest service center.

-276-6196

Caution

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30 Clamp Meter

Required Equipment

Table 1 lists the equipment required to perform the calibration procedure.

Table 1. Calibration Equipment

Instrument Type Recommended Model

AC Calibrator Fluke 5700A Transconductance Amplifier Fluke 5220A Digital Multimeter Fluke 77 Lab Supply (0-10V) Resistor (MF, 30.1 ohms, 1%) Fluke PN 296665 Resistor (MF, 27.4 ohms, 1%) Fluke PN 296368 50 Turn Current Coil 5500A coil

Preparing for Calibration

1. Configure the test equipment as shown in Figure 1.

2. Disassemble the meter by removing the four screws on the case back.

3. Remove the battery cover and front panel.

4. Turn on the meter and use a DMM to verify that the battery level is between 7 and 9 volts. If the battery

does not meet this criteria, replace the battery before proceeding with the calibration procedure.

Note

The test equipment should be allowed to warmup and stabilize for at least 30 minutes before starting the calibration checks.

5700A/5720A 5500A

1V PK

MAX

A, -SENSE,

AUX V

20V PK

SCOPE

200V PK

MAX

20V RMS MAX

TRIG OUT

5500A Coil

Conductor

MAX

HOLD

400A

200A

200

200V 600V OFF

COM

600V

Calibrator

5220A

NORMAL AUX

V, ,

RTD

1000V

RMS MAX

20V PK

MAX

Figure 1. Calibration Equipment Configuration

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Calibration Adjustments

Complete the following procedure to calibrate the meter. Refer to Figure 2 for the adjustment locations.

AC Voltage Calibration

1. Set the meter to the 200V AC range. Connect the calibrator to the input of the meter, and program the calibrator to 100V AC at 60 Hz. Adjust VR3 to indicate “100.0” on the display.

2. Set the calibrator to 0V and set the meter to the 600V AC range. Set the calibrator to 600V AC at 60 Hz, and verify that the display reading is within the tolerance specified in Table 2.

AC Current Calibration

1. Set the calibrator to 3.8 amps at 60 Hz.

2. Set the meter to the 200A AC range. Clamp the meter around the 5500A coil as shown in Figure 1.

Center the jaws on the coil using the indicator marks on the jaws of the meter and adjust VR2 to indicate “191.0” on the display (adjusting to 191.0 amps ensures that the clamp meets accuracy specifications where response roll-off occurs).

3. Set the meter to the 400A AC range and set the calibrator to 7A AC at 50 Hz. Verify that the display

reading is within the tolerance specified in Table 2. If the value is out of tolerance, balance the

calibration between the 200A and 400A ranges so that both ranges fall within the tolerance specified in

Table 2.

Calibration Adjustments

Ohms Calibration

The ohms ranges are not adjustable.

Continuity Beeper Calibration

Connect a 30.1e resistor across the meter’s input terminals, and turn VR4 slowly until the beeper sounds.

VR3

VR1

VR4

VR2

VR3

VR4

VR1

Low Battery Indication Cali brat i on

1. Disconnect the battery from the meter, and connect the lab supply to the battery terminals. Set the

power supply to 6.7V, and turn on the meter. Slowly adjust VR1 until the low battery indicator

appears.

Figure 2. Calibration Adjustment Locations

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30 Clamp Meter

2. Set the power supply to 7.0V, and verify that the low battery indicator goes off.

Reassembly

1. Press and release the hold switch (so the switch is down), and fit the button over the switch housing.

2. Set the mark on the function switch axis to the 200V AC position (horizontal position), see Figure 4.

3. Set the rotary switch on the front panel to the 200V position.

4. Reinstall the front panel, making sure the wires surrounding the PCB are not caught between the front

and back case halves.

5. Reinstall all but the battery cover screw (three screws) on the case back.

6. Reinstall the battery and battery cover. Then secure with the battery cover screw.

Performance Check

To perform a performance check on the meter, set up the test equipment as shown in Figure 1. Referring to Table 2, set the 5700A calibrator controls as shown, and verify that the meter readings fall between the high and low limits for each range.

Table 2. Performance Test Measurement Points

5700 Settings Range Low Limit High Limit

Current AC Freq. Hz

20A 60 200A 18.8A 21.2A 190A 60 200A 187.3A 192.7A 40A 60 400A 36A 44A 350A 50 400A 342A 358A 400A 60 400A 388A 412A

Volts AC Freq. Hz

20V 60 200V 19.5 20.5 190V 60 200V 187.4V 192.6V 60V 60 600V 56V 64 600V 60 600V 590V 610V

Resistance Ω

190Ω NA Ohms 186.9Ω 193.1Ω To verify the continuity beeper, connect a 27.4Ω resistor (PN 296368) across the input terminals and verify the beeper

sounds.

VR2

VR3

HOLD SWITCH

FUNCTION SWITCH

Figure 4. Rotary Switch Position

200V

HOLD

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