Tektronix Handheld Instruments Reference manual

Technical Reference

Handheld Instruments Basic Service

061-4123-00

Warning

The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service.

that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.

Service Reference

This manual contains the Performance Verification and Adjustment procedures for many handheld products. Table i lists the products supported by this manual.

T able i: Handheld products supported by this manual

Products

CMM150 AC Current Probe DMM249 Digital Multimeter DCM300 and 320 Digital Clamp Multimeters DMM254 Digital Multimeter DCM330 Digital Clamp Meter DMM800 Series Digital Multimeters DCM910 Digital Clamp Meter DMM912, 914, and 916 Digital Multimeters DMM150 Digital Multimeter DTM510 and DTM520 Digital Thermometers DMM157 Digital Multimeter (serial numbers

above TW80000)

DTM900 and DTM920 Digital Thermometers

Service information of products not provided in this manual may be available under separate cover. Table ii provides a list of many handheld and benchtop instruments and their service documentation.

T able ii: Handheld and benchtop instruments service manuals

Product Tektronix part number

212 Oscilloscope 070-5053-00 214 Oscilloscope 070-5055-00 214 Storage Oscilloscope 070-1483-00 221 Oscilloscope 070-1573-01 222 Digital Storage Oscilloscope 070-7459-00 222A DSO:

B010100 thru B039999 B040000 and above

222PS Power Scout 070-8098-02

070-8330-00 070-8330-02

224 Digital Storage Oscilloscope 070-8405-02 305 DMM Oscilloscope 070-2423-01 314 Storage Oscilloscope 070-1824-00 335 Oscilloscope 070-1943-01 336 Digital Storage Oscilloscope 070-4421-00

Handheld Instruments Basic Service

Service Reference

T able ii: Handheld and benchtop instruments service manuals (cont.)

Product Tektronix part number

2201 Portable Oscilloscope 070-7189-00 2205 Oscilloscope 070-6716-00 221 1 Oscilloscope 070-7234-00 2214 Digital Storage Oscilloscope 070-7783-00 2220 Digital Storage Oscilloscope 070-5302-00 2221A Oscilloscope:

B010100 to B019999

B020000 and above 2225 Oscilloscope 070-6299-00 2230 Digital Storage Oscilloscope 070-4999-00 2232 Digital Storage Oscilloscope:

B010100 to B029999

B030000 and above 2235 AN/USM-488 Oscilloscope 070-4977-00

070-8157-01 070-8549-00

070-7067-01 070-8548-00

2245 Portable Oscilloscope 070-6276-00 2245A Portable Oscilloscope:

B010100 to B015999

B016000 and above 2246A Portable Oscilloscope 070-6555-00 2246/1Y/2R/2246 Mod A 070-7062-00 2247A Portable Oscilloscope 070-6367-00 2252 Portable Oscilloscope 070-7838-01 2335 Oscilloscope 070-41 16-00 2336 Oscilloscope 070-41 18-00 2336Y A Oscilloscope 070-501 1-00 2337 Oscilloscope 070-4120-00 TAS 455/465 Oscilloscope 070-8524-02 TAS 465 Oscilloscope 070-9403-00 TAS 475/485 Oscilloscope:

B010100 to B020099

B020100 and above TDS 210/220 Oscilloscope 070-9693-01 TDS 310/320/350 Oscilloscope 070-8570-05

070-6557-00 070-7672-00

070-8878-01 070-9404-00

TDS 340/340A/360/380 Oscilloscope 070-9435-02 THS 710/720/730 Oscilloscope 070-9246-03

Handheld Instruments Basic Service

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to the products in this manual or any products connected to them. To avoid potential hazards, use these products only as specified.

Only qualified personnel should perform service procedures.

While using these products, you may need to access other parts of the system. Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system.

To Avoid Fire or

Personal Injury

Use Proper Power Cord. To avoid fire hazard, use only the power cord specified

for the product you are using.

Use Proper V oltage Setting. Before applying power, ensure that the line selector is in the proper position for the power source being used.

Connect and Disconnect Properly . Do not connect or disconnect probes or test leads while they are connected to a voltage source.

Ground the Product. Some of these products are grounded through the grounding conductor or the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product you are using, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product you are using. Consult the product manual for further ratings information before making connections to the product.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

Replace Batteries Properly. Replace batteries only with the proper type and rating specified.

Recharge Batteries Properly. Recharge batteries for the recommended charge cycle only.

Use Proper AC Adapter. Use only the AC adapter specified for the product you are using.

Handheld Instruments Basic Service

iii

General Safety Summary

Do Not Operate Without Covers. Do not operate these products with covers or panels removed.

Use Proper Fuse. Use only the fuse type and rating specified for the product you are using.

Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present.

Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate these products in wet or damp conditions.

Do Not Operate in Explosive Conditions. To avoid injury or fire hazard, do not operate these products in an explosive atmosphere.

Keep Product Surfaces Clean and Dry . To avoid electric shock and erroneous readings, keep probe surfaces clean and dry.

Symbols and Terms

Provide Proper Ventilation. Refer to the product installation instructions for details

on installing the product so it has proper ventilation.

T erms in this Manual. These terms may appear in this manual.

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

T erms on the Products. These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the

marking. WARNING indicates an injury hazard not immediately accessible as you read the

marking. CAUTION indicates a hazard to property including the product.

Handheld Instruments Basic Service

General Safety Summary

Symbols on the Product. The following symbols may appear on the product:

DANGER

High Voltage

Protective Ground

(Earth) T erminal

ATTENTION

Refer to Manual

Double

Insulated

Handheld Instruments Basic Service

General Safety Summary

Handheld Instruments Basic Service

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service

procedures. Do Not Service Alone. Do not perform internal service or adjustments of this

product unless another person capable of rendering first aid and resuscitation is present.

Disconnect Power. To avoid electric shock, disconnect the main power by means of the power cord or, if provided, the power switch.

Use Caution When Servicing the CRT. To avoid electric shock or injury, use extreme caution when handling the CRT. Only qualified personnel familiar with CRT servicing procedures and precautions should remove or install the CRT.

CRTs retain hazardous voltages for long periods of time after power is turned off. Before attempting any servicing, discharge the CRT by shorting the anode to chassis ground. When discharging the CRT, connect the discharge path to ground and then the anode. Rough handling may cause the CRT to implode. Do not nick or scratch the glass or subject it to undue pressure when removing or installing it. When handling the CRT, wear safety goggles and heavy gloves for protection.

Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components.

To avoid electric shock, do not touch exposed connections. X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the

high-voltage circuitry or the CRT enclosure. X-ray emissions generated within this product have been sufficiently shielded.

Handheld Instruments Basic Service

vii

Service Safety Summary

viii

Handheld Instruments Basic Service

Preventing Electrostatic Discharge

CAUTION. Static discharge can damage internal semiconductor components. Follow the guidelines listed below to avoid product damage.

When performing service that requires internal access to an instrument, adhere to the following precautions to avoid damaging internal modules or their components:

H Avoid handling modules or components in areas that have floors or work

surfaces capable of generating a static charge.

H Spray carpeted work areas with a solution of equal parts of water and fabric

softener.

H Wear clothing made from materials that do not accumulate static charges.

Avoid Wool (and some artificial fibers) which build up static charges readily; wear cotton which conducts electricity and resists static accumulation.

H Minimize the handling of static-sensitive devices. H Transport and store static-sensitive devices in their protected containers or on

a metal rail. Label any package that contains static-sensitive parts.

H Service instruments and modules at grounded, static-free work stations. H Do not allow devices capable of generating a static charge on a work station

surface.

H Wear a grounding strap while working with static-sensitive devices. H Handle circuit boards by their edges, if possible. H Do not slide static-sensitive components over any surface. H Do not use high-velocity compressed air to clean or dry components or

modules.

Handheld Instruments Basic Service

Preventing Electrostatic Discharge

Handheld Instruments Basic Service

Preface

This manual contains service information for a wide range of handheld products. Each section covers a product or related series of products and includes the following information:

H A product description that details instrument functions, capabilities, and

recommended uses

H A front panel illustration H A set of electrical, mechanical, environmental, and physical specifications H A performance verification procedure to ensure the instrument meets

specifications

H An adjustment procedure to return the instrument to factory calibration (not

included for all instruments)

The information contained in this manual is current at the date of publication and is typical or suggested, not guaranteed.

Some instruments have optional service information available under separate cover. This manual does not duplicate information from optional service manuals. Refer to the optional accessories list in your user manual for Tektronix part numbers of optional service manuals. A list of many handheld and benchtop instruments manuals are listed in Table ii on Page i.

NOTE. This manual provides the necessary service information to verify that your instrument is working properly. Should you have service-related questions not covered in either this manual or in an optional service manual, please contact your Tektronix Service Center for additional information.

For product warranty information, refer to the user manual supplied with your instrument.

Handheld Instruments Basic Service

Preface

Contacting Tektronix

Product Support

Service Support

For other information

To write us Tektronix, Inc.

For application-oriented questions about a Tektronix measurement product, call toll free in North America: 1-800-TEK-WIDE (1-800-835-9433 ext. 2400) 6:00 a.m. – 5:00 p.m. Pacific time

Or contact us by e-mail: tm_app_supp@tek.com

For product support outside of North America, contact your local Tektronix distributor or sales office.

Contact your local Tektronix distributor or sales office. Or visit our web site for a listing of worldwide service locations.

http://www.tek.com In North America:

1-800-TEK-WIDE (1-800-835-9433) An operator will direct your call.

P.O. Box 1000 Wilsonville, OR 97070-1000

xii

Handheld Instruments Basic Service

Instructions Manual

CMM150 AC Current Probe

070-9937-00

CMM150 AC Current Probe 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CMM150 Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CMM150 Performance Verification 5. . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Set Up 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification Procedure 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CMM150 T est Record 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CMM150 Adjustment Procedures 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Adjustment 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handheld Instruments Basic Service

Table of Contents

Handheld Instruments Basic Service

CMM150 AC Current Probe

The CMM150 measures AC current (up to 300 A) when used with the DMM150 Digital Multimeter.

The current probe acts as a current to voltage transformer. The probe captures the current induced magnetic fields around a conductor (wire) and converts the fields to a proportional voltage that is displayed on the DMM150.

Figure 1: CMM150 AC Current Probe with DMM150 Digital Multimeter

Handheld Instruments Basic Service

CMM150 AC Current Probe

Handheld Instruments Basic Service

CMM150 Specifications

Accuracies are ±(% reading + number of digits) at 23_ C ±5_ C at less than 80% R.H. (relative humidity).

T able 1: General specifications

Characteristics Description

Operating temperature 0 _C to 45 _C <75% R.H. Storage temperature –20 _C to +60 _C <75% R.H. T emperature coef ficient 0.15  (specified accuracy) /_C

(<18 _C or >28 _C)

Dimensions (W L D) with holster 72 mm  102 mm  36 mm

(2.83 in.  4.02 in.  1.42 in.) Weight 130.1 g (0.29 lbs) Maximum altitude 2000 m Maximum jaw opening 30 mm (1.18 in) Maximum conductor size 29 mm dia. (1.14 in.)

T able 2: Measurement characteristics

Characteristics Description

Current range 0.1 A to 300 A AC Output voltage 10 mV/A Accuracy ±(1.9% + 0.5 A) 50X60 Hz

±(3.9% + 1 A) 40X400 Hz

Maximum bare wire voltage 600VAC Sensor type Induction coil Maximum output impedance 120 W

RMS

CAT II

T able 3: Certifications and compliances

EC Declaration of Conformity Meets intent of Low Voltage Directive 73/23/EEC for Product Safety. Compliance was

demonstrated to the following specifications as listed in the Official Journal of the

European Communities

Low Voltage Directive 73/23/EEC:

EN 61010-1 Safety requirements for electrical equipment for

measurement, control, and laboratory use

Certifications Certified by CSA to CAN/CSA–C22.22 No. 231 and UL1244

Handheld Instruments Basic Service

CMM150 Specifications

T able 3: Certifications and compliances (cont.)

Overvoltage Category Category: Examples of Products in this Category:

CA T III Distribution-level mains, fixed installation

Local-level mains, appliances, portable equipment Signal levels in special equipment or parts of equipment,

telecommunications, electronics

Pollution Degree 2

CA T II CA T I

As defined in EN 61010-1. Do not operate in environments where conductive pollutants may be present.

Handheld Instruments Basic Service

CMM150 Performance Verification

This section contains the procedure to verify that the CMM150 AC Current Probe performs as warranted when installed on a DMM150 Digital Multimeter. If an instrument fails any of these checks, it needs adjustment and or repair.

The performance verification procedure provides a valid confirmation of instrument electrical characteristics and function under the following conditions:

Test Equipment

H The CMM150 and DMM150 operate in an 18_ to 28_

C (64_ to 82_ F)

ambient environment with a relative humidity of less than 75%.

H The DMM150 stabilizes at the stated ambient temperature for one hour. H The DMM150 warms up for five minutes. H The DMM150 is set to the 3 V AC mode. H Allow the DMM150 to settle to its final value before taking the measure-

ment.

The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently.

The performance verification procedure uses external traceable test equipment to directly check warranted characteristics.

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 4. If you substitute equipment, you may need to modify the procedures.

NOTE. Before beginning the performance verification procedure, warm up the test equipment according to the manufacturer’s recommendations.

T able 4: Test equipment

Description Minimum requirements Example product

Universal Calibration System

Handheld Instruments Basic Service

ББББББ

Resolution & accuracy 4 times

БББББББ

greater than the multimeter display reading

БББББББ

Wavetek 9100 with option 200

БББББББ

current coil set

БББББББ

CMM150 Performance Verification

Set Up

To prepare for the performance verification checks, do the following steps.

1. Attach the CMM150 to the DMM150 and allow them to stabilize at the

ambient temperature for one hour before testing.

Verification Procedure

AC Ampere Check

2. Turn the DMM150 on by pushing the slide switch to V

NOTE. You need to keep the DMM150 powered on throughout the warm-up period and throughout the entire verification procedure.

3. Warm up the DMM150 for five minutes.

4. Photocopy the test record on page 7 to record your test results.

Implement the following checks to verify the performance of your CMM150 AC Current Probe.

WARNING. To avoid electric shock, avoid touching exposed connections.

Perform the following steps to verify the AC ampere measurement accuracy.

V .

1. Set the DMM150 slide switch to V

2. Push the Blue function button to select AC volts.

3. Press the RANGE button to select the 3 V range.

4. Select the appropriate coils as necessary to multiply the AC current

calibrator output to each of the values given in the Test Record. For more information, refer to the user manual of your calibrator.

5. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

6. Verify that the multimeter reads within the specified Display minimum and

maximum limits.

7. Turn the calibrator output off.

8. Remove the clamp from the current loop.

V .

Handheld Instruments Basic Service

CMM150 Performance Verification

CMM150 Test Record

Serial number Procedure performed by Date

CMM150 test record

Test input Tolerance Display minimum Reading Display maximum

AC ampere test (50 Hz or 60 Hz)

0.1 A ±1.9% + 0.5 A –.005 .007

10.0 A ±1.9% + 0.5 A .094 .106

100.0 A ±1.9% + 0.5 A .976 1.024

300.0 A ±1.9% + 0.5 A 2.938 3.062

Handheld Instruments Basic Service

CMM150 Performance Verification

Handheld Instruments Basic Service

CMM150 Adjustment Procedures

This section contains procedures to adjust the CMM150 AC Current Probe. Perform these procedures once a year or if the CMM150 Performance Verifica- tion procedure indicates the need for calibration.

In this section you will find the following information:

H A list of adjustments H A list of test equipment needed to make the adjustments H Instructions on how to prepare the instrument for adjustment H Step-by-step adjustment procedures

The procedures in this section do not verify performance. To confirm that your multimeter meets factory specifications, perform the procedures in the CMM150 Performance Verification section.

Test Equipment

Test Accessories

The test equipment listed in Table 4 on page 5 is a complete list of equipment needed for the adjustment procedures. This procedure assumes that the test equipment is operating within tolerance.

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 4. If you substitute equipment, you may need to modify the procedures.

In addition to the test equipment, some additional test accessories are required to perform the adjustment procedure.

T able 5: Test accessories

Description Qty Example product

Couplers Patch cords 2 ITT Pomona B8

ITT Pomona 5635

Handheld Instruments Basic Service

CMM150 Adjustment Procedures

Preparation for Adjustment

The following guidelines apply to all CMM150 adjustments:

Adjustment

H Perform all adjustments in a 21_ to 25_

relative humidity of 75% or less.

H Warm up the DMM150 for at least 15 minutes. H Do not alter any setting without reading the entire adjustment procedure first. H Do not alter a setting unless a performance characteristic cannot be met at the

current setting.

H Read the Safety Summary at the beginning of this manual.

1. Connect the CMM150 to the DMM150 as shown in Figure 2.

VR1

C ambient environment with a

Coupler

Figure 2: Adjustment location

2. Set the DMM150 to measure AC volts.

3. Select the appropriate coil to multiply the AC current calibrator output to

100.0 Amps at 60 Hz.

4. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

5. Adjust VR1 for a reading of 1.000.

6. Turn the calibrator output off.

7. Remove the clamp from the current loop.

Patch cord

Handheld Instruments Basic Service

Instructions Manual

DCM300 and DCM320 Digital Clamp Multimeters

070-9847-01

DCM300 and DCM320 Digital Clamp Multimeters 1. . . . . . . . . . . . . .

DCM300 and DCM320 Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . .

DCM300 and DCM320 Performance Verification 7. . . . . . . . . . . . . . . .

T est Equipment 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Set Up 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification Procedure 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM300 and DCM320 T est Record 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM300 and DCM320 Adjustment Procedures 13. . . . . . . . . . . . . . . . .

List of Adjustments 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Adjustment 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handheld Instruments Basic Service

Table of Contents

Handheld Instruments Basic Service

DCM300 and DCM320 Digital Clamp Multimeters

The DCM300 and DCM320 Digital Clamp multimeters measure AC current, AC voltage, and resistance/continuity. The meters use a current transformer to measure current without opening the circuit.

The meters automatically select the correct measurement range and have a 4000 count resolution. (The maximum reading is 3999.)

The DCM320 meter provides true RMS readings for both AC volts and AC current.

Figure 1: DCM300 Digital Clamp Multimeter

Handheld Instruments Basic Service

DCM300 and DCM320 Digital Clamp Multimeters

Handheld Instruments Basic Service

DCM300 and DCM320 Specifications

The characteristics listed in this section apply under the following conditions: H The instrument operates in a 0_ to 45_ C ambient environment unless

otherwise noted.

H The instrument warms up for at least 20 minutes.

NOTE. All specifications are warranted unless marked “typical.” Typical characteristics are not guaranteed but are provided for the convenience of the user.

T able 1: Electrical characteristics

Characteristic Description

AC Voltage, Auto Ranging (nominal Input Impedance: 10 MW, <100 pF)

Ranges 600 V and 400 V Voltage Rating 600 V Resolution

400 V Range 0.1 V 600 V Range 1 V

Accuracy 40 to 500 Hz: ±(1.2% of reading + 5 digits)

Crest Factor (DCM 320 only) 1.4 to 2.0, add 0.6% to accuracy

2.0 to 2.5, add 2.0% to accuracy

AC Current, Auto Ranging

Ranges 600 A and 400 A Overload Protection 800 A Uninsulated Wire Voltage Rating 600 V Resolution

400 A Range 0.1 A 600 A Range 1 A

Accuracy 50 to 60 Hz

400 A Range ±(1.9% of reading + 5 digits) 600 A Range ±(2.9% of reading + 5 digits)

RMS

CAT II

Crest Factor (DCM 320 only) 1.4 to 2.0, add 1.0% to accuracy

Handheld Instruments Basic Service

2.0 to 2.5, add 2.5% to accuracy

DCM300 and DCM320 Specifications

1010.1

L 1 11-1 M

T able 1: Electrical characteristics (cont.)

Characteristic Description

Resistance, Auto ranging (meter beeps if resistance is <100 W.)

Ranges 4 kW and 40 kW Overload Protection 600 V Resolution

4 kW Range 1 W

40 kW Range 10 W Accuracy ±(2.0% of reading + 9 digits) Maximum Open Circuit Voltage 1 V

RMS

T able 2: General specifications

Characteristic Description

Auto Power Off Approximately 30 minutes Battery 9 V, ANSI/NEDA1604A, IEC 6F22 Battery Life 200 hours (alkaline) Maximum Conductor Size 40 mm

T able 3: Certifications and compliances

Certifications

Overvoltage Category Category: Examples of Products in this Category:

Pollution Degree 2 Do not operate in environments where conductive pollutants may be present.

anadian Standards Association certified to Standard CSA UL31 11-1 for Electrical and Electronic Measuring and Testing Equipment, and IEC1010-2-032 particular requirements for hand-held current clamps for electrical measurement and test.

CA T III Distribution-level mains, fixed installation CA T II Local-level mains, appliances, portable equipment CA T I Signal levels in special equipment or parts of equipment,

telecommunications, electronics

, Standard

Handheld Instruments Basic Service

T able 4: Environmental characteristics

Characteristic Description

Temperature

Operating

Nonoperating T emperature Coef ficient Maximum Altitude (Operating) 2,200 m (7,218 ft.)

0_ to 45° C (32_ to 113° F), <75% relative humidity –20_ to +60° C (–4_ to 140° F), <80% relative humidity

0.2% (specified accuracy) per _C at <18_ C (64_ F) or >28_ C (82_ F)

DCM300 and DCM320 Specifications

Handheld Instruments Basic Service

DCM300 and DCM320 Specifications

Handheld Instruments Basic Service

DCM300 and DCM320 Performance Verification

This section contains procedures to verify that the DCM300 and DCM320 Digital Clamp Multimeters perform as warranted. If an instrument fails any of the checks, it needs adjustment and or repair.

The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions:

H The instrument operates in an 18_ to 28_ C ambient environment with a

relative humidity of less than 75%.

H The instrument warms up for 20 minutes. H The instrument remains fully assembled (do not remove the bottom cover).

The DCM300 and DCM320 performance verification consists of the checks listed in Table 5.

T able 5: Performance verification checks

AC Current Check

Test Equipment

AC Voltage Check Resistance and Continuity Check

The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently.

The performance verification procedures use external traceable test equipment to directly check warranted characteristics.

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 6. If you substitute equipment, you may need to modify the procedures.

NOTE. Before beginning the performance verification procedures, warm up the test equipment according to the manufacturer’s recommendations.

Handheld Instruments Basic Service

DCM300 and DCM320 Performance Verification

100

5500

T able 6: Test equipment

Description Minimum requirements Example product

AC Current Calibrator >0.5% accuracy, 0 to 400 A

AC Voltage Calibrator >0.2% accuracy Resistance Calibrator >0.3% accuracy

Set Up

To prepare for the performance verification checks, do the following.

1. Turn the DCM300/DCM320 Digital Clamp Multimeter on by sliding the

function switch to any position other than OFF.

2. Warm up the instrument for 20 minutes.

>0.7% accuracy, 400 to 600 A

Wavetek 9 current multiplier coils or Fluke

A with Wavetek X10 and

X50 Current multiplier Coils

with option 2

Verification Procedure

AC Current Check

3. Photocopy the test record on pages 11 and 12 to record your test results.

The following checks verify the performance of your DCM300 or DCM320 multimeter.

WARNING. The following procedures produce magnetic fields that may cause a malfunction in heart pacemakers or damage to sensitive equipment.

To check the AC current accuracy, perform the following steps.

1. Set the multimeter function switch to the A

position.

2. Set up the AC current calibrator to output the values in the AC current test

record.

NOTE. Select the appropriate coils to multiply the AC Current calibrator output for each of the values listed in the AC current test record.

3. For each of the conditions listed in the AC current test record, position the

clamp around the current loop of the AC current calibrator and release the clamp trigger. Ensure that the clamp is entirely closed.

Handheld Instruments Basic Service

DCM300 and DCM320 Performance Verification

4. Verify that the multimeter display reads within the specified Display

minimum and maximum limits for each of the specified conditions.

5. Turn the calibrator output off.

6. Remove the clamp from the current loop.

AC Voltage Check

Resistance and Continuity

Check

To check the AC voltage accuracy, perform the following steps.

WARNING. To avoid electric shock, avoid touching the exposed connections on the multimeter circuit board.

1. Set the multimeter function switch to the V

2. Connect the AC voltage calibrator output to the multimeter V–W and COM

input terminals.

3. Set the calibrator to each of the values listed in the AC voltage test record

and verify that the multimeter display reads within the specified Display minimum and maximum limits.

4. Turn the calibrator output off.

5. Disconnect the calibrator.

To check the resistance accuracy and verify the continuity function, perform the following steps.

1. Set the multimeter function switch to the W

position.

2. Connect the resistance calibrator output to the multimeter V–W and COM

3. Set the calibrator to each of the values listed in the Resistance and continuity

4. Turn the calibrator output off.

5. Disconnect the calibrator.

Handheld Instruments Basic Service

input terminals.

test record and verify that the display reads within the specified Display minimum and maximum limits.

DCM300 and DCM320 Performance Verification

Handheld Instruments Basic Service

DCM300 and DCM320 Performance Verification

DCM300 and DCM320 Test Record

Serial number Procedure performed by Date

DCM300 and DCM320 test record

Test input Tolerance Display minimum Reading Display maximum

AC current test

0 A ±0.5 A 00.0 00.5

10.0 A 50 Hz ±0.7 A 09.3 10.7

60 Hz ±0.7 A 09.3 10.7

100.0 A 50 Hz ±2.4 A 97.6 102.4

60 Hz ±2.4 A 97.6 102.4

300.0 A 50 Hz ±6.2 A 293.8 306.2

60 Hz ±6.2 A 293.8 306.2

380.0 A 50 Hz ±8 A 372.0 388.0

60 Hz ±8 A 372.0 388.0

600 A 50 Hz ±22 A 578 622

60 Hz ±22 A 578 622

AC voltage test

0 V ±0.5 V 00.0 00.5

10.0 V 500 Hz ±0.6 V 09.4 10.6

100.0 V 500 Hz ±1.7 V 98.3 101.7

380.0 V 500 Hz ±5.1 V 374.9 385.1 600 V 50 Hz ±12 V 588 612

500 Hz ±12 V 588 612

Handheld Instruments Basic Service

DCM300 and DCM320 Performance Verification

120

DCM300 and DCM320 test record (cont.)

Test input Display maximumReadingDisplay minimumTolerance

Resistance and continuity test

W ±9 W 000 W 009 W

Buzzer must sound

W ±11 W 109 W 131 W

Buzzer must sound

1.000 kW ±0.029 kW 971 W 1.029 kW

3.700 kW ±0.083 kW 3.617 kW 3.783 kW

39.00 kW ±0.87 kW 38.13 kW 39.87 kW

Handheld Instruments Basic Service

DCM300 and DCM320 Adjustment Procedures

This section contains procedures to adjust DCM300 and DCM320 Digital Clamp multimeters. If your instrument fails a performance requirement, use these procedures to return it to factory specifications.

In this section you will find the following information:

H A list of adjustments H A list of test equipment needed to make the adjustments H Instructions on how to prepare the instrument for adjustment H Step-by-step adjustment procedures

The procedures in this section do not verify performance. To confirm that your multimeter meets factory specifications, implement the procedures in the DCM300 and DCM320 Performance Verification section.

List of Adjustments

Test Equipment

Use the adjustments listed in Table 7 to return DCM300 and DCM320 multimeters to factory calibration.

T able 7: DCM300 and DCM320 adjustments

AC Current AC Voltage Resistance Continuity

The test equipment listed in Table 6 on page 8 is a complete list of equipment needed for the adjustment procedures. These procedures assume that all test equipment is operating within tolerance. Detailed operating instructions for test equipment are not given in this procedure. If you need operating information, refer to the instruction manual of the test equipment.

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 6. If you substitute equipment, you may need to modify the procedures.

Handheld Instruments Basic Service

DCM300 and DCM320 Adjustment Procedures

Preparation for Adjustment

The following guidelines apply to all DCM300 & DCM320 adjustments. H Perform all adjustments in a 21_ to 25_ C ambient environment with a

relative humidity of 75% or less.

H Before making any adjustment, warm up the multimeter for 20 minutes. H Do not alter any setting without reading the entire adjustment procedure first. H Do not alter a setting unless a performance characteristic cannot be met at

the current setting.

H Read the Safety Summary at the beginning of this manual.

Open the Meter Case

Adjustment Procedure

You must open the meter case to gain access to the internal adjustments.

1. Lay the meter face down on a flat work surface.

2. Remove the two screws from the meter bottom with a Phillips-head

screwdriver.

3. Gently lift the end of the bottom cover until it unsnaps from the top cover.

Do not remove the circuit board mounting screws.

To reassemble the meter following the adjustments, perform steps 2 and 3 above in reverse order.

To return your instrument to factory calibration, perform the following procedures.

WARNING. The following procedures produce magnetic fields that may cause a malfunction in heart pacemakers or damage to sensitive equipment.

AC Current

To adjust the AC current calibration, perform the following steps.

1. Set the AC current calibrator to output 100 A at 50 Hz.

2. Set the multimeter function switch to the A position.

3. Select the appropriate coil to multiply the AC current calibrator output to

100 A at 50 Hz.

Handheld Instruments Basic Service

DCM300 and DCM320 Adjustment Procedures

4. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

5. Adjust VR2 with a small flat-tipped screwdriver; set the multimeter reading

to 100.0.

6. Turn the calibrator output off.

7. Remove the clamp from the current loop.

AC Voltage

Resistance

To adjust the AC voltage calibration, perform the following steps.

WARNING. To avoid electrical shock, avoid touching the exposed connections on the multimeter circuit board.

1. Set the multimeter function switch to the V

2. Connect the AC voltage calibrator output to the multimeter V–W and COM

input terminals.

3. Set the AC voltage calibrator to output 300 V at 500 Hz (DCM300) or 300 V

at 50 Hz (DCM320).

4. Adjust VR1 with a small flat-tipped screwdriver; set the multimeter reading

to 300.0.

5. Turn the calibrator output off.

6. Disconnect the calibrator from the multimeter.

To adjust the resistance calibration, perform the following steps.

1. Set the multimeter function switch to the W

position.

2. Connect the resistance calibrator output to the multimeter V–W and COM

3. Set the resistance calibrator to simulate a 1 kW resistance load.

4. Adjust VR3 with a small flat-tipped screwdriver; set the multimeter reading

5. Turn the calibrator output off.

6. Disconnect the calibrator from the multimeter.

Handheld Instruments Basic Service

input terminals.

to 1.000.

DCM300 and DCM320 Adjustment Procedures

Continuity

To adjust the continuity calibration, perform the following steps.

1. Connect the resistance calibrator output to the multimeter V–W and COM

input terminals.

2. Set the resistance calibrator to simulate a 150 W resistance load.

3. Place the bottom cover back on the meter and hold it in place. (The

continuity buzzer will not sound during the following adjustments without the cover in place.)

4. If the buzzer does not sound, use a small flat-tipped screwdriver to adjust

VR4 until the buzzer sounds. You will have to remove the bottom cover to make the adjustment and then replace the cover to make the test.

5. If the buzzer does sound, use a small flat-tipped screwdriver to adjust VR4

until the buzzer does not sound. After that, use the screwdriver to adjust VR4 until the buzzer sounds again. (Remove the cover to adjust; replace the cover to test.)

6. When you complete all adjustments, turn the multimeter off and replace the

bottom cover. Do not pinch the battery leads between the case halves during reassembly.

VR3

VR4

VR1

VR2

Figure 2: Adjustment locations

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T able 8: Summary of adjustments

DCM300 and DCM320 Adjustment Procedures

Adjustment name

AC Current 100.0 A 50 Hz VR2 ±1.0 A 99.0 101.0 AC Volts 300.0 V 500 Hz (DCM300)

Ohm

Test value Range setting

50 Hz (DCM320)

1.000 kW VR3 ±1 W 999 W 1.001 kW 150 W VR4 Adjust VR4 until the buzzer just sounds

Circuit location

VR1 ±0.3 V 299.7 300.3

Tolerance

Display minimum

Display maximum

Handheld Instruments Basic Service

DCM300 and DCM320 Adjustment Procedures

Handheld Instruments Basic Service

Instructions Manual

DCM330 Digital Clamp Meter

070-9848-01

DCM330 Digital Clamp Meter 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM330 Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM330 Performance Verification 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Set Up 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification Procedure 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM330 T est Record 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM330 Adjustment Procedures 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Adjustments 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Adjustment 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handheld Instruments Basic Service

Table of Contents

Handheld Instruments Basic Service

DCM330 Digital Clamp Meter

The DCM330 Digital Clamp Meter measures DC current, AC current, and frequency. The meter uses a Hall-effect device to measure current without opening the circuit.

The meter automatically selects the correct measurement range and has a 4000 count resolution. (The maximum reading is 3999.)

The DCM330 meter provides true RMS readings for AC current.

Figure 1: DCM330 Digital Clamp Meter

Handheld Instruments Basic Service

DCM330 Digital Clamp Meter

Handheld Instruments Basic Service

DCM330 Specifications

The characteristics listed in this section apply under the following conditions: H The instrument operates in a 0° to 50° C (32° to 122° F) ambient environ-

ment unless otherwise noted.

H The instrument warms up for at least 20 minutes.

NOTE. All specifications are warranted unless marked “typical.” Typical characteristics are not guaranteed but are provided for the convenience of the user.

T able 1: Electrical characteristics

Characteristic Description

Overload Protection 2000 A for one minute Uninsulated Wire Voltage 600 V Measuring Rate 2 times per second nominal AC Current, Auto Ranging

Ranges 400 A and 1000 A

Uninsulated Wire Voltage Rating 600 V

Resolution

400 A Range 0.1 A 1000 A Range 1 A

Accuracy 40 Hz to 400 Hz

0 A to 400 A ±(1.9% of reading + 8 counts) 401 A to 1000 A ±(2.9% of reading + 5 counts) Crest Factor 1.4 to 2.0, add 1.0% to accuracy

2.0 to 2.5, add 2.5% to accuracy

DC Current, Auto Ranging

Ranges 400 A and 1000 A

Resolution

400 A Range 0.1 A 1000 A Range 1 A

RMS

CAT II

Handheld Instruments Basic Service

DCM330 Specifications

T able 1: Electrical characteristics (cont.)

Characteristic Description

Accuracy

0 A to 20 A ±(1.9% of reading + 10 counts)

20.1 A to 400 A ±(1.9% of reading + 40 counts) 401 A to 1000 A ±(2.9% of reading + 5 counts)

Frequency, Auto Ranging

Ranges 4 kHz and 10 kHz Sensitivity 6 A Resolution

4 kHz Range 1 Hz 10 kHz Range 10 Hz

Accuracy ±(0.5% of reading + 3 counts)

Peak Hold

Range Low, High Resolution

Low 0.1 A High 1.0 A

Accuracy ±(3% of reading + 10 counts)

RMS

(10 A

RMS

, 1kHz to 10 kHz)

T able 2: General specifications

Characteristic Description

Auto Power Off Approximately 30 minutes Battery 9 V, ANSI/NEDA1604A, IEC 6F22 Battery Life 40 hours (alkaline) Maximum Conductor Size 51 mm (2 inch) diameter or 24 × 60 mm (.95 × 2.36 inch) bus bar

Handheld Instruments Basic Service

T able 3: Certifications and compliances

1010.1

L 1 11-1 M

DCM330 Specifications

Certifications

Overvoltage Category Category: Examples of Products in this Category:

Pollution Degree 2 Do not operate in environments where conductive pollutants may be present.

CA T III Distribution-level mains, fixed installation CA T II Local-level mains, appliances, portable equipment CA T I Signal levels in special equipment or parts of equipment,

telecommunications, electronics

, Standard

T able 4: Environmental characteristics

Characteristic Description

Temperature

Operating

Nonoperating T emperature Coef ficient Maximum Altitude (Operating) 2,000 m (6,562 ft)

0° to 50° C (32° to 122° F), <75% relative humidity –20° C to +60° C (21° to 140° F), <80% relative humidity

0.2 × (specified accuracy) per °C at <18° C or >28° C

Handheld Instruments Basic Service

DCM330 Specifications

Handheld Instruments Basic Service

DCM330 Performance Verification

This section contains procedures to verify that the DCM330 Digital Clamp Meter performs as warranted. If an instrument fails any of the checks, it needs adjustment and or repair.

The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions:

H The instrument operates in an 18_ to 28_ C (64_ to 82_ F) ambient

environment with a relative humidity of less than 75%.

H The instrument warms up in the ambient environment for at least one hour. H The instrument remains fully assembled (do not remove the bottom cover).

The DCM330 performance verification consists of the checks listed in Table 5.

T able 5: Performance verification checks

AC Current Check DC Current Check

Test Equipment

Frequency Check

The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently.

The performance verification procedures use external traceable test equipment to directly check warranted characteristics.

Alternative test equipment must meet or exceed the intended minimum requirements specfied in Table 6. If you substitute equipment, you may need to modify the procedures.

NOTE. Before beginning the performance verification procedures, warm up the test equipment according to the manufacturer’s recommendations.

Handheld Instruments Basic Service

DCM330 Performance Verification

100

T able 6: Test equipment

Set Up

To prepare for the performance verification checks, do the following.

1. Turn the DCM330 Digital Clamp Meter on.

2. Warm up the meter for 20 minutes.

3. Photocopy the test record on pages 11 and 12 to record your test results.

Description Minimum requirements Example product

AC/DC Current Calibrator >0.5 % accuracy 0 to 400 A

>0.7 % accuracy 400 to 1000 A

Wavetek 9 200 current multiplier coils

with Option

Verification Procedure

AC Current Check

The following checks verify the performance of your DCM330 meter.

WARNING. The following procedures produce magnetic fields that may cause a malfunction in heart pacemakers or damage to sensitive equipment.

To check the AC current accuracy, perform the following steps.

1. Set the meter function to AC.

2. Select the appropriate coils as necessary to multiply the AC current

calibrator output to each of the test values in the AC current test record. For more information, refer to the user manual of your calibrator.

3. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

4. Verify that the display reads within the specified Display minimum and

maximum limits.

5. Turn the calibrator output off.

6. Remove the clamp from the current loop.

Handheld Instruments Basic Service

DCM330 Performance Verification

DC Current Check

To check the DC current accuracy, perform the following steps.

1. Set the meter function to DC.

2. In the absence of any magnetic fields, press the DCA AUTO ZERO button

to zero the meter.

3. Select the appropriate coil(s) as necessary to multiply the DC current

calibrator output to each of the test values in the DC current test record. For more information, refer to the user manual of your calibrator.

4. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

5. Verify that the display reads within the specified Display minimum and

maximum limits.

6. Before each measurement, set the calibrator output to off and press the DCA AUTO ZERO button to zero the meter.

NOTE. Any time a measurement appears to be out of tolerance, turn the calibrator output off, rezero the meter, and try again.

7. Turn the calibrator output off.

8. Disconnect the calibrator.

Handheld Instruments Basic Service

DCM330 Performance Verification

Frequency Check

To check the frequency accuracy, perform the following steps.

1. Set the meter function to Hz.

2. Select the appropriate coil as necessary to multiply the AC current calibrator

output to 20 A.

3. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

4. Verify that the display reads within the specified Display minimum and

maximum limits for each of the frequencies listed in the Frequency test record.

5. Turn the calibrator output off.

6. Disconnect the calibrator.

Handheld Instruments Basic Service

DCM330 Performance Verification

DCM330 Test Record

Serial number Procedure performed by Date

DCM330 test record

Test input Tolerance Display minimum Reading Display maximum

AC current test

0.0 A ±0.8 A –00.8 00.8

10.0 A 50 Hz ±1.0 A 0.90 1 1.0 400 Hz ±1.0 A 0.90 11.0

100.0 A 50 Hz ±2.7 A 97.3 102.7 400 Hz ±2.7 A 97.3 102.7

300.0 A 50 Hz ±6.5 A 293.5 306.5 60 Hz ±6.5 A 293.5 306.5

380.0 A 50 Hz ±8 A 372.0 388.0 60 Hz ±8 A 372.0 388.0

600 A 50 Hz ±22 A 578 622

60 Hz ±22 A 578 622

60 Hz

1 1

±34 A 966 1034 ±34 A 966 1034

1000 A 50 Hz

At these frequencies, the inductance of the DCM330 may shut down the output of some calibrators. If this happens, decrease the calibrator output frequency until the output remains on for the duration of the test.

Handheld Instruments Basic Service

DCM330 Performance Verification

DCM330 test record (cont.)

Test input Display maximumReadingDisplay minimumTolerance

DC current test

0.0 A ±1.0 A –1.0 01.0

10.0 A ±1.2 A 08.8 11.2

100.0 A ±5.9 A 94.1 105.9

300.0 A ±9.7 A 290.3 309.7 600 A ±22 A 578 622 1000 A ±34 A 966 1034 –10.0 A ±1.2 A –11.2 –8.8 –100.0 A ±5.9 A –105.9 –94.1 –300.0 A ±9.7 A –309.7 –290.3 –600 A ±22 A –622 –578 –1000 A ±34 A –1034 –966

Frequency test

20 A 20 Hz ±3 Hz 0.017 kHz 0.023 kHz 20 A 50 Hz ±3 Hz 0.047 kHz 0.053 kHz 20 A 60 Hz ±3 Hz 0.057 kHz 0.063 kHz 20 A 100 Hz ±4 Hz 0.096 kHz 0.104 kHz 20 A 1 kHz ±8 Hz 0.992 kHz 1.008 kHz 20 A 3 kHz ±18 Hz 2.982 kHz 3.018 kHz 20 A 5 kHz ±60 Hz 4.94 kHz 5.06 kHz 20 A 7 kHz ±70 Hz 6.93 kHz 7.07 kHz 20 A 10 kHz ±80 Hz 9.92 kHz 10.08 kHz

Handheld Instruments Basic Service

DCM330 Adjustment Procedures

This section contains procedures to adjust the DCM330 Digital Clamp Meter. If your instrument fails a performance requirement, use these procedures to return it to factory specifications.

In this section you will find the following information:

H A list of adjustments H A list of test equipment needed to make the adjustments H Instructions on how to prepare the instrument for adjustment H Step-by-step adjustment procedures

The procedures in this section do not verify performance. To confirm that your multimeter meets factory specifications, perform the procedures in the DCM330 Performance Verification section.

List of Adjustments

Test Equipment

Use the adjustments listed in Table 7 to return the DCM330 clamp meter to factory calibration.

T able 7: DCM330 adjustments

Position Error AC Current DC Current Peak Hold

Alternative test equipment must meet or exceed the intended minimum requirements specfied in Table 6. If you substitute equipment, you may need to modify the procedures.

Handheld Instruments Basic Service

DCM330 Adjustment Procedures

Preparation for Adjustment

The following guidelines apply to all DCM330 adjustments.

H Perform all adjustments in a 21_ to 25_ C ambient environment with a

H Before making any adjustment, warm up the current meter for at least

H Do not alter any setting without reading the entire adjustment procedure first. H Do not alter a setting unless a performance characteristic cannot be met at

H Read the Safety Summary at the beginning of this manual.

relative humidity of 75% or less.

30 minutes.

the current setting.

Open the Meter Case

Adjustment Procedure

You must open the meter case to gain access to the internal adjustments.

1. Lay the meter face down on a flat work surface.

2. Remove the two screws from the case bottom with a Phillips-head

screwdriver.

3. Gently lift the end of the case bottom until it unsnaps from the case top.

4. Remove the three screws that secure the circuit board assembly to the case

top. Do not remove the screws that secure the circuit boards to each other.

5. To access the adjustments, lift the circuit board assembly far enough out of

the top case to expose the adjustments. See Figure 2 and the procedure that follows.

To reassemble the meter following the adjustments, perform steps 2 through 4 above in reverse order.

To return your instrument to factory calibration, implement the following procedures.

Use a small flat-tipped screwdriver to make the adjustments. Refer to Figure 2 for adjustment locations.

WARNING. Magnetic fields are produced that may cause a malfunction in heart pacemakers, or damage to sensitive equipment.

Handheld Instruments Basic Service

VR1 VR2

VR3 VR5 VR6 VR7

VR8

DCM330 Adjustment Procedures

Short for Auto Zero (VR2)

Short for Peak Hold (VR9)

VR9 VR10

Position Error

DC Auto Zero

Figure 2: Adjustment locations

To adjust the position error calibration, perform the following steps.

1. Set the clamp meter to the AC position.

2. Select the appropriate coil to multiply the AC current calibrator output to

380 A at 50 Hz.

3. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

4. Adjust VR1 to maintain the measurement error to less than 1% total while

positioning the coil in the clamp.

5. Turn the calibrator output off.

6. Remove the clamp meter from the coil.

To adjust the DC zero calibration, perform the following steps.

1. Set the clamp meter to the DC position.

2. Short the Auto Zero points indicated in Figure 2.

Handheld Instruments Basic Service

DCM330 Adjustment Procedures

3. Adjust VR2 until the display reads 00.0 ± 5 counts.

4. Remove the short.

5. Press the clamp meter DCA AUTO ZERO button to zero the display.

6. Adjust VR3 until the display reads 00.0.

DC 400 A Range

DC 1000 A Range

To adjust the DC 400 A range calibration, perform the following steps.

1. Set the clamp meter to the DC position.

2. Select the appropriate coil to multiply the DC current calibrator output to

200 A.

3. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

4. Position the clamp to the center of the coil.

5. Adjust VR5 until the display reads 201.5.

6. Turn the calibrator output off.

7. Remove the clamp meter from the coil.

To adjust the DC 1000 A range calibration, perform the following steps.

1. Set the clamp meter to the DC position.

2. Select the appropriate coil to multiply the DC current calibrator output to

400 A.

3. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

4. Press the clamp meter DCA AUTO ZERO button to zero the display.

5. Position the clamp to the center of the coil.

6. Adjust VR6 until the display reads 400.

7. Turn the calibrator output off.

8. Remove the clamp meter from the coil.

Handheld Instruments Basic Service

DCM330 Adjustment Procedures

AC 400 A Range

AC 1000 A Range

To adjust the AC 400 A range calibration, perform the following steps.

1. Set the clamp meter to the AC position.

2. Select the appropriate coil to multiply the AC current calibrator output to

390 A at 400 Hz.

3. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

4. Position the clamp to the center of the coil.

5. Adjust VR8 until the display reads 396.0. To keep the meter on the lower

range, it may be necessary to cycle the calibrator output off and on.

6. Turn the calibrator output off.

7. Remove the clamp meter from the coil.

To adjust the AC 1000 A range calibration, perform the following steps.

1. Set the clamp meter to the AC position.

2. Select the appropriate coil to multiply the AC current calibrator output to

400 A at 400 Hz.

Peak Hold

3. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

4. Position the clamp to the center of the coil.

5. Adjust VR7 until the display reads 400.

6. Turn the calibrator output off.

7. Remove the clamp meter from the coil.

To adjust the peak hold calibration, perform the following steps.

1. Set the clamp meter to the AC position.

2. Short the Peak Hold points indicated in Figure 2.

3. Press PEAK HOLD to activate the function.

4. Adjust VR9 until the display reads 00.0.

5. Remove the short.

6. Press PEAK HOLD to cancel the function.

7. Press PEAK HOLD again to verify that the display reads 00.0.

Handheld Instruments Basic Service

DCM330 Adjustment Procedures

T able 8: Summary of adjustments

8. Press PEAK HOLD to cancel the function.

9. Repeat steps 2 through 8 above until the display reads 00.0.

10. Select the appropriate coil to multiply the AC current calibrator output to

200 A at 400 Hz.

11. Position the clamp around the coil of the current calibrator and release the

clamp trigger. Ensure that the clamp is entirely closed.

12. Position the clamp to the center of the coil.

13. Adjust VR10 until the display reads 200.0.

14. Turn the calibrator output off.

15. Remove the clamp meter from the coil.

16. Reassemble the meter.

Adjustment name

Position Error AC 380 A 50 Hz VR1 <5 counts 0 count 5 counts DC Zero DC VR2

DC 400 A Range

DC 1000 A Range

AC 400 A Range

AC 1000 A Range

Peak Hold AC VR9

Auto Zero points shorted.

Peak Hold points shorted.

Mode Test value Frequency

DC VR3 ±0.1 –00.1 +00.1 DC 200.0 A VR5 ±0.5 201.2 201.8

DC 400 A VR6 ±1 399 401

AC 390.0 A 400 Hz VR8 ±0.1 395.5 396.5

AC 400 A 400 Hz VR7 ±1 399 401

AC 200.0 A 120 Hz VR10

Circuit location

Display

Tolerance

±0.5 –00.5 00.5

±0.1 199.9 200.1

minimum

00.0 00.0

Display maximum

Handheld Instruments Basic Service

Instructions Manual

DCM910 Digital Clamp Meter

070-9849-01

DCM910 Digital Clamp Meter 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM910 Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM910 Performance Verification 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Set Up 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Verification Procedure 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM910 T est Record 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCM910 Adjustment Procedures 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Adjustments 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Equipment 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Adjustment 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedure 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handheld Instruments Basic Service

Table of Contents

Handheld Instruments Basic Service

DCM910 Digital Clamp Meter

The DCM910 Digital Clamp Meter measures DC current, AC current, and frequency. The meter uses a Hall-effect device to measure current without opening the circuit.

The meter automatically selects the correct measurement range and has a 4000 count resolution. (The maximum reading is 3999.)

The DCM910 meter provides true RMS readings for AC current.

Figure 1: DCM910 Digital Clamp Meter

Handheld Instruments Basic Service

DCM910 Digital Clamp Meter

Handheld Instruments Basic Service

DCM910 Specifications

The characteristics listed in this section apply under the following conditions: H The instrument operates in a 0° to 50° C (32° to 122° F) ambient environ-

ment unless otherwise noted.

H The instrument warms up for at least 20 minutes.

NOTE. All specifications are warranted unless marked “typical.” Typical characteristics are not guaranteed but are provided for the convenience of the user.

T able 1: Electrical characteristics

Characteristic Description

Overload Protection 2000 A for one minute Uninsulated Wire Voltage 600 V Measuring Rate 2 times per second nominal AC Current, Auto Ranging

Ranges 400 A and 1000 A Uninsulated Wire Voltage Rating 600 V Resolution

400 A Range 0.1 A 1000 A Range 1 A

Accuracy 40 Hz to 400 Hz

0 A to 400 A ±(1.9% of reading + 8 counts) 401 A to 1000 A ±(2.9% of reading + 5 counts) Crest Factor 1.4 to 2.0, add 1.0% to accuracy

2.0 to 2.5, add 2.5% to accuracy

DC Current, Auto Ranging

Ranges 400 A and 1000 A Resolution

400 A Range 0.1 A 1000 A Range 1 A

RMS

CAT II

Handheld Instruments Basic Service

DCM910 Specifications

T able 1: Electrical characteristics (cont.)

Characteristic Description

Accuracy

0 A to 20 A ±(1.9% of reading + 10 counts)

20.1 A to 400 A ±(1.9% of reading + 40 counts) 401 A to 1000 A ±(2.9% of reading + 5 counts)

Frequency, Auto Ranging

Ranges 4 kHz and 10 kHz Sensitivity 6 A Resolution

4 kHz Range 1 Hz 10 kHz Range 10 Hz

Accuracy ±(0.5% of reading + 3 counts)

Peak Hold

Range Low, High Resolution

Low 0.1 A High 1.0 A

Accuracy ±(3% of reading + 10 counts)

RMS

(10 A

RMS

, 1kHz to 10 kHz)

T able 2: General specifications

Characteristic Description

Auto Power Off Approximately 30 minutes Battery 9 V, ANSI/NEDA1604A, IEC 6F22 Battery Life 40 hours (alkaline) Maximum Conductor Size 51 mm (2 inch) diameter or 24 × 60 mm (.95 × 2.36 inch) bus bar

Handheld Instruments Basic Service

T able 3: Certifications and compliances

1010.1

L 1 11-1 M

DCM910 Specifications

Certifications

Overvoltage Category Category: Examples of Products in this Category:

Pollution Degree 2 Do not operate in environments where conductive pollutants may be present.

CA T III Distribution-level mains, fixed installation CA T II Local-level mains, appliances, portable equipment CA T I Signal levels in special equipment or parts of equipment,

telecommunications, electronics

, Standard

T able 4: Environmental characteristics

Characteristic Description

Temperature

Operating

Nonoperating T emperature Coef ficient Maximum Altitude (Operating) 2,000 m (6,562 ft)

0° to 50° C (32° to 122° F), <75% relative humidity –20° C to +60° C (21° to 140° F), <80% relative humidity

0.2 × (specified accuracy) per °C at <18° C or >28° C

Handheld Instruments Basic Service

DCM910 Specifications

Handheld Instruments Basic Service

DCM910 Performance Verification

This section contains procedures to verify that the DCM910 Digital Clamp Meter performs as warranted. If an instrument fails any of the checks, it needs adjustment and or repair.

The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions:

H The instrument operates in an 18_ to 28_ C (64_ to 82_ F) ambient

environment with a relative humidity of less than 75%.

H The instrument warms up in the ambient environment for at least one hour. H The instrument remains fully assembled (do not remove the bottom cover).

The DCM910 performance verification consists of the checks listed in Table 5.

T able 5: Performance verification checks

AC Current Check DC Current Check

Test Equipment

Frequency Check

The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently.

The performance verification procedures use external traceable test equipment to directly check warranted characteristics.

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 6. If you substitute equipment, you may need to modify the procedures.

NOTE. Before beginning the performance verification procedures, warm up the test equipment according to the manufacturer’s recommendations.

Handheld Instruments Basic Service

DCM910 Performance Verification

100

T able 6: Test equipment

Set Up

To prepare for the performance verification checks, do the following.

1. Turn the DCM910 Digital Clamp Meter on.

2. Warm up the meter for 20 minutes.

3. Photocopy the test record on pages 11 and 12 to record your test results.

Description Minimum requirements Example product

AC/DC Current Calibrator >0.5 % accuracy 0 to 400 A

>0.7 % accuracy 400 to 1000 A

Wavetek 9 200 current multiplier coils

with Option

Verification Procedure

AC Current Check

The following checks verify the performance of your DCM910 meter.

WARNING. The following procedures produce magnetic fields that may cause a malfunction in heart pacemakers or damage to sensitive equipment.

To check the AC current accuracy, perform the following steps.

1. Set the meter function to AC.

2. Select the appropriate coils as necessary to multiply the AC current

calibrator output to each of the test values in the AC current test record. For more information, refer to the user manual of your calibrator.

3. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

4. Verify that the display reads within the specified Display minimum and

maximum limits.

5. Turn the calibrator output off.

6. Remove the clamp from the current loop.

Handheld Instruments Basic Service

DCM910 Performance Verification

DC Current Check

To check the DC current accuracy, perform the following steps.

1. Set the meter function to DC.

2. In the absence of any magnetic fields, press the DCA AUTO ZERO button

to zero the meter.

3. Select the appropriate coil(s) as necessary to multiply the DC current

calibrator output to each of the test values in the DC current test record. For more information, refer to the user manual of your calibrator.

4. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

5. Verify that the display reads within the specified Display minimum and

maximum limits.

6. Before each measurement, set the calibrator output to off and press the DCA AUTO ZERO button to zero the meter.

NOTE. Any time a measurement appears to be out of tolerance, turn the calibrator output off, rezero the meter, and try again.

7. Turn the calibrator output off.

8. Remove the clamp from the current loop.

Handheld Instruments Basic Service

DCM910 Performance Verification

Frequency Check

To check the frequency accuracy, perform the following steps.

1. Set the meter function to Hz.

2. Select the appropriate coil as necessary to multiply the AC current calibrator

output to 20 A.

3. Position the clamp around the current loop of the current calibrator and

release the clamp trigger. Ensure that the clamp is entirely closed.

4. Verify that the display reads within the specified Display minimum and

maximum limits for each of the frequencies listed in the Frequency test record.

5. Turn the calibrator output off.

6. Remove the clamp from the current loop.

Handheld Instruments Basic Service

DCM910 Performance Verification

DCM910 Test Record

Serial number Procedure performed by Date

DCM910 test record

Test input Tolerance Display minimum Reading Display maximum

AC current test

0.0 A ±0.8 A –00.8 00.8

10.0 A 50 Hz ±1.0 A 09.0 1 1.0 400 Hz ±1.0 A 09.0 11.0

100.0 A 50 Hz ±2.7 A 97.3 102.7 400 Hz ±2.7 A 97.3 102.7

300.0 A 50 Hz ±6.5 A 293.5 306.5 60 Hz ±6.5 A 293.5 306.5

380.0 A 50 Hz ±8.0 A 372.0 388.0 60 Hz ±8.0 A 372.0 388.0

600 A 50 Hz ±22 A 578 622

60 Hz ±22 A 578 622

60 Hz

1 1

±34 A 966 1034 ±34 A 966 1034

1000 A 50 Hz

At these frequencies, the inductance of the DCM910 may shut down the output of some calibrators. If this happens, decrease the calibrator output frequency until the output remains on for the duration of the test.

Handheld Instruments Basic Service

DCM910 Performance Verification

DCM910 test record (cont.)

Test input Display maximumReadingDisplay minimumTolerance

DC current test

0.0 A ±1.0 A –01.0 01.0

10.0 A ±1.2 A 08.8 11.2

100.0 A ±5.9 A 94.1 105.9

Frequency test

Handheld Instruments Basic Service

DCM910 Adjustment Procedures

This section contains procedures to adjust the DCM910 Digital Clamp Meter. If your instrument fails a performance requirement, use these procedures to return it to factory specifications.

In this section you will find the following information:

H A list of adjustments H A list of test equipment needed to make the adjustments H Instructions on how to prepare the instrument for adjustment H Step-by-step adjustment procedures

The procedures in this section do not verify performance. To confirm that your multimeter meets factory specifications, perform the procedures in the DCM910 Performance Verification section.

List of Adjustments

Test Equipment

Use the adjustments listed in Table 7 to return the DCM910 clamp meter to factory calibration.

T able 7: DCM910 adjustments

Position Error AC Current DC Current Peak Hold

Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 6. If you substitute equipment, you may need to modify the procedures.

Handheld Instruments Basic Service

DCM910 Adjustment Procedures

Preparation for Adjustment

The following guidelines apply to all DCM910 adjustments.