TPI A254 Manuel utilisateur

A254

User Guide

CONTROLS AND FUNCTIONSSAFETY WARNINGS AND CAUTIONS

Read all instructions.

1. Always wear safety goggles when working

near batteries. Keep yourself, clothing and test

equipment clear of all moving or hot engine

parts. Be sure ignition is in OFF position, and

all accessories are off before disconnecting bat-

tery.

2. Never place smoking materials, sparks, or

open flames near batteries. Gasoline and bat-

tery gases are highly explosive.

3. Use equipment in locations with adequate

ventilation. Engine exhaust contains carbon

monoxide gas, a colorless, odorless lethal gas.

4. Always disconnect the ground connections

on all batteries before servicing the electrical

system. Be sure all test leads are connected as

instructed before conducting a test.

5. Apply the parking brake, place the gear

selector in neutral (standard transmission)

or park (automatic transmission) and block

the drive wheels. Disable the ignition or

fuel system before performing starting sys-

tem tests.

Jaw Opening

Trigger

DCmA Zero

Adjust Knob

Power On

Indicator

Power And

Range Selector

Switch

Jaw Opening

Point

MEASURING DC CURRENT

Make sure that the ground and positive leads

are plugged into the proper receptacle for cor-

responding function positions.

Do not attempt to make a

current measurement of

more than 60A or of a cur-

rent that is unknown.

Measurement Procedure:

1. Turn the DMM on and manually set the

DMM rotary switch to 2 or 4 DCV func-

tion.

2. With the A254 connected to the BNC to

banana plug adapter, insert the GND

plug into the COM input jack and the +

plug into the V input jack.

3. Select the desired range on the A254.

4. Using the ZERO knob on the front of

the A254, adjust it until the display on

the DMM reads “0.000”.

5. Clamp the A254 around a single wire to

the circuit to be measured.

6. Read the current on the DMM.

NOTE: Refer to chart on page 5 for read-

ing interpretations

READING INTERPRETATION

CHART

DMM V 10mV/A 100mV/A

Reading Range Range

0.001 100 mA 10 mA

0.005 500 mA 50 mA

0.010 1.0 amps 100 mA

0.015 1.5 amps 150 mA

0.025 2.5 amps 250 mA

0.050 5.0 amps 500 mA

0.075 7.5 amps 750 mA

0.100 10.0 amps 1 amp

0.125 12.5 amps 1.25 amps

0.150 15.0 amps 1.50 amps

0.175 17.5 amps 1.75 amps

0.200 20.0 amps 2.0 amps

0.250 25.0 amps 2.5 amps

0.300 30.0 amps 3.0 amps

0.350 35.0 amps 3.5 amps

0.400 40.0 amps 4.0 amps

0.450 45.0 amps 4.5 amps

0.500 50.0 amps 5.0 amps

0.550 55.0 amps 5.5 amps

0.600 60.0 amps 6.0 amps

. x .

. x

1.000 x 10.0 amps

APPLICATION:

PARASITIC LOAD ON BATTERY

Measurement Procedure:

1. Turn the DMM on and manually set the

DMM rotary switch to 2 or 4 DCV func-

tion.

2. With the A254 connected to the BNC to

banana plug adapter, insert the GND

plug into the COM input jack and the +

plug into the V input jack.

3. Select the 100mV/A range on the A254.

4. Using the ZERO knob on the front of

the A254, adjust it until the display on

the DMM reads “0.000”.

5. Clamp the A254 around the negative

battery cable.

6. Read the current on the DMM.

MEASURING AC CURRENT

Make sure that the ground and positive leads

are plugged into the proper receptacle for cor-

responding function positions.

Do not attempt to make a

current measurement of

more than 60A or of a cur-

rent that is unknown.

Measurement Procedure:

1. Turn the DMM on and manually set the

DMM rotary switch to 2 or 4 ACV func-

tion.

2. With the A254 connected to the BNC to

banana plug adapter, insert the GND

plug into the COM input jack and the +

plug into the V input jack.

3. Select the desired range on the A254.

4. Clamp the A254 around a single wire to

the circuit to be measured.

5. Read the current on the DMM.

NOTE: Refer to chart on page 5 for read-

ing interpretations

SPECIFICATIONS

FUNCTION RANGE ACCURACY

DCA

100mV/A 10mA - 20A +/- (1.5% + 20mA)

10mV/A 100mA - 40A +/- (2% + 20mA)

40A - 60A +/- (4% + 20mA)

ACA

100mV/A 10mA - 10A +/- (2% + 20mA)

(40Hz to 1kHz)

+/- (4% + 30mA)

(1kHz to 10kHz)

+/- (8% + 30mA)

(10kHz to 20kHz)

10mV/A 100mA - 40A +/- (2% + 30mA)

(40Hz to 1kHz)

+/- (4% + 30mA)

(1kHz to 2kHz)

+/- (6% + 30mA)

(2kHz to 5kHz)

Operating Temperature 32 to 122 degrees F

Storage Temperature -4 to 158 degress F

Relative Humidity 0 to 80%

Max Conductor Size 9.0mm (0.35 inches)

Power Supply 9 Volt Battery

APPLICATION NOTES:

PARASITIC LOAD ON BATTERY

(KOEO- Key Off, Engine Off)

Please refer the figure on page 8

regarding the following notes:

1. Note the reading on the 133 is

-.012 This is becsuse we attached the

A254 to the negative (-) battery cable to

ensure you measure the entire parasitic

draw on the battery. Most new automo-

biles have multiple cables attached to the

positive post that does not allow you to

include all in your measurement.

2. Refering to the chart on page 5, a reading

of .012 DC volts with the A254 set on the

100mV/A range is actually 120mA

(milliamps).

3. Note that the 133 is set on the 2 DCV

range. This is the range the output of the

A254 is designed to use on the 120 and

133 meters. Use the 4 volt range on the

153, 163, 183 and 440.

MAINTENANCE

Battery Replacement

1. Set the switch on the front of the

A254 to the OFF position.

2. Unplug the A254 from the DMM or

scope.

3. Remove the 3 screws from the back

of the A254.

4. Separate the front and back housing

and replace the 9 volt battery.

5. Reassemble in reverse order.

Cleaning your A254

Clean the surface area of the A254 with

a mild detergent and damp cloth.

Troubleshooting Guide

No Reading on DMM: Plugged into

incorrect input

jacks. DMM set

to incorrect range

and func-tion

No Power On light: Dead battery

Broken battery

snap wires.

Test Products International, Inc.

A254 Instruction Manual

TPI reserves the right to make

changes at any time without notice

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