Test Equipment Depot BST-CM273 Instruction Manual

1000A

CAT.

Ⅲ

600V

AC V

OFF

AC A

DC V

DC A

A ZERO

COM

V

AC

000

V

MAX

600V

HOLD

Ω

Ω

MAX

CAT.

Ⅲ

AC/DC CLAMP METER

99 Washington Street
Melrose, MA 02176

Phone [phone]

Visit us at www.TestEquipmentDepot.com

Toll Free 1-800-517-8431

BST-CM273

AC/DC CLAMP METER

INSTRUCTION MANUAL

INDEX

1. INTRODUCTION................................

Page

1

2. SAFETY NOTES................................

3. FEATURES.........................................

4. SPECIFICATIONS..............................

5. INSTRUMENT LAYOUT.....................

6. MEASUREMENT................................

7. MAINTENANCE.................................

2

3

4-6

7-8

9-11

12

1. INTRODUCTION

NOTE

This meter has been designed and tested according
to CE Safety Requirements for Electronic Measuring
Apparatus, EN61010-1, EN 61010-2-32 and other safety
standards. Follow all warnings to ensure safe operation.

WARNING

READ "SAFETY NOTES" (NEXT PAGE) BEFORE
USING THE METER.

-1-

2. SAFETY NOTES

Read the following safety information carefully before
attempting to operate or service the meter.

● Use the meter only as specied in this manual,

otherwise the protection provided by the meter may be

impaired.

● Always keep hands behind the meter barrier.

● Use extreme caution when clamping around uninstalled

conductors or bus bars.

● Never clamp around any conductor carrying a voltage

above 600V R.M.S.

● Rated environmental conditions:

1. Indoor use.

2. Installation Category III.

3. Pollution degree II.

4. Altitude up to 2000 Meter.

5. Relative Humidity 80% Max.

6. Ambient Temperature 0~40°C.

● Observe the international Electrical Symbols listed

below:

Meter protected throughout by double insulation
or reinforced insulation.

Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the

meter.
Alternating current.

Earth (ground) terminal.

-2-

3. FEATURES

● Full Autorange for all functions.

● Data Hold function freezes the reading.

● Max Hold function holds the absolutely maximum of

readings.

● LCD backlight function.

● Flashlight function.

● Low battery indication.

● Safety design throughout with no exposed metal parts,

shielded banana plugs and recessed input terminals.

● The Ohm function is ideal for checking continuity of

relays, transformers and motor coils.

● Diode check function.

-3-

4. SPECIFICATIONS

Ranges:

AC Voltage: 400/600 V
AC Current: 400/1000 A
DC Voltage: 400/600 V
DC Current: 400/1000 A

Resistance: 400/2000 Ω

Diode : 400/2000 mV at 1mA

ACV

Range Resolution Accuracy
400V 0.1V
600V 1V

ACA

Range Resolution Accuracy
400A 0.1A
1000A 1A

*Frequency Response 40Hz~500Hz

DCV

Range Resolution Accuracy
400V 0.1V
600V 1V

±(1.0%rdg+3dgt)

±(1.5%rdg+3dgt)

±(0.75%rdg+3dgt)

-4-

DCA

Range Resolution Accuracy
400A 0.1A
1000A 1A

Resistance

Range Resolution Accuracy

400Ω 0.1Ω
2000Ω 1Ω

*Buzzer sounds below 38.0Ω

● Overload protection

ACV 750V rms.
DCV 1000V.
Diode & Ohm 600V rms.

● Conductor Size

Approx. 40mm Max.

● Operating Principle: Dual slope integration.

● Over Rage Indication: "O.L" indicated.

● Low Battery Indication: " " sign appears on the

display.

● Response Time:

Approx.1 second.

±(1.5%rdg+3dgt)

±(1.0%rdg+3dgt)

-5-

● Sample Rate:

Approx.2 times per second.

● Temperature & Humidity for Guaranteed

0°C~40°C at 80% max. relative humidity.

● Storage Temperature & Humidity:

-10°C~50°C at 80% max. relative humidity.

● Dimensions

255(L) x 80(W) x 35(D)mm.

● Weight

Approx. 420g (battery included).

● Power Source

9V (6F22) x 1.

● Accessories:

Test leads.
Soft pouch.
Instruction manual.
9V (6F22) x 1.

-6-

5. INSTRUMENT LAYOUT

(1)

(2)

1000A

CAT.Ⅲ 600V

OFF

AC V

(3)

(4)

DC V

AC A

DC A

Ω

A ZERO

AC/DC CLAMP METER

MAX

(8)

(7)

HOLD

(9)

(5)

(6)

AC

COM

000

MAX

600V

-7-

V

Ω

V

CAT.

Ⅲ

(1) Transformer Jaws

Pick up the conductor within the jaws center.

(2) Barrier

Provide a protective distance from hands to conductor.

(3) Jaw Trigger

Press to open the jaws.

(4) DCA zero adjustment shaft

(5) LCD Display

3¾ digit LCD with the maximum reading of 3999.

(6) Input Terminals

(7) Function Switch

(8) Max Button

Hold the absolute maximum of readings with " "
indicated.

(9) Data Hold Button

Freeze the reading for all ranges with " "

HOLD

indicated.

MAX

-8-

6. MEASUREMENT

Before proceeding with measurement, read the safety
notes.
(1) AC Voltage measurement

● Insert the BLACK test lead to COM and the RED

one to the other terminal.

● Set the function switch to ACV.

● Connect the test leads to the object to be

measured.when measuring AC voltage, the polarity
of the leads can be ignored.

● Read the display.

(2) DC Voltage measurement

● Insert the BLACK test lead to COM and the RED

one to the other terminal.

● Set the function switch to DCV.

● Connect the test leads to the object to be measured.

● Read the display.

※ Reversing the polarity of the test leads displays a
negative value.

-9-

+

-

(3) AC Current measurement

● Set the function switch to ACA.

● Press the jaw trigger to open the transfomer jaw

and clamp onto one conductor only.

● Read the display.

LOADLOAD

1000A

MAX

CAT.Ⅲ 600V

OFF

AC V

1000A

MAX

CAT.Ⅲ 600V

OFF

AC V

DC V

AC A

DC A



Ω

A ZERO

HOLD

AC/DC CLAMP METER

V

AC

000



Ω

V

MAX

COM

600V

CAT.

Ⅲ

O X

DC V

AC A

DC A

Ω



A ZERO

HOLD

AC/DC CLAMP METER

V

AC

000

Ω

V

MAX

COM

600V

CAT.

Ⅲ

(4) DC Current measurement

● Set the function switch to DCA.

※ If the inital reading of DCA is not zero, adjust

the "DCA zero adjustment shaft" until the
display shows zero.

● Press the jaw trigger to open the transfomer jaw

and clamp onto one conductor only.

● Read the display.

-10-

LOADLOAD

(5) Resistance & Diode measurement
CAUTION!
Make sure that there is no voltage in the circuit or

components being measured.

For resistance test:

● Insert the BLACK test lead to COM and the RED

one to the other terminal.

● Set the function switch to Ω.

● Connect the test leads to the object to be measured.

● Read the display.

For Diode test:

● Connect the test leads to the diode for testing.

● Read the forward Voltage of diode directly from the

display.
※ Reversing the polarity of the test leads displays

O.L.

-11-

7. MAINTENANCE

Battery Replacement:

When the low battery warning sign appears, replace with
a new battery as follows:
(1) Disconnect the test leads from the clamp meter and

turn off the power.

(2) Unscrew the battery cover and replace with a new

Battery.

Cleaning and Storage:

WARNING

To avoid electrical shock or damage to the meter, do
not get water inside the case.

Periodically wipe the case with a damp cloth and
detergent. Do not use abrasives or solvents.

If the meter is not to be used for a long time over 60
days, please remove the battery for storage.

-12-

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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