Instructions manual [PDF] (7 pages)
- Updated: 08.06.2026
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Instructions for:
digital automotive analyser 15 function with IC/IR
MODEL No: TA304
1.
SAFETY
1.1.
PERSONAL PRECAUTIONS
When using this multimeter, please observe all normal safety rules concerning:
Protection against the dangers of electrical current.
Protection of the meter against misuse.
Full compliance with safety standards can only be guaranteed if used with the test leads supplied. If necessary, they must be replaced with genuine
Sealey leads with the same electronic ratings. Failure to do so will invalidate the warranty.
DO NOT use leads if damaged or if the wire is bared in any way.
DO NOT use the meter if it has been damaged.
1.2.
GENERAL SAFETY INSTRUCTIONS
WARNING! USE EXTREME CAUTION when working with high voltages.
Familiarise yourself with the application and limitations of the multimeter as well as the potential hazards. IF IN ANY DOUBT CONSULT A QUALIFIED
ELECTRICIAN.
Before commencing testing, follow instructions below and select the correct input sockets, function and range on the multimeter.
When the meter is connected to a circuit, do not touch any unused meter terminals.
When the magnitude of the value to be measured is unknown beforehand, set the range selector to the highest value available.
Before rotating the range selector to change functions, disconnect test probes from the circuit under test.
WARNING! Never perform resistance, transistor, diode or continuity measurements on live circuits.
Always take care when working with voltages above 35V DC or 25V AC rms. These voltages are considered a shock hazard.
Always keep fingers behind the probe barriers whilst measuring and DO NOT use when hands are wet.
DO NOT touch the test leads, tips or the circuit being tested.
Choose the proper range and function for the required measurement. DO NOT try voltage or current measurements that may exceed the ratings marked on
the Function/Range switch.
When testing for the presence of a voltage or current, make sure the meter is functioning correctly. Take a reading of a known voltage or current before
accepting a zero reading.
DO NOT test voltages above 600V AC or DC - the circuitry of the multimeter will be destroyed.
WARNING! NEVER connect the multimeter to a voltage source / live circuit when the rotary switch is set to any other function apart from Voltage testing.
WARNING! Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical
contacts. Other means should be used to ensure that the terminals are not “live”.
Avoid damaging the meter when testing voltage. Disconnect the test leads from the test points before changing functions.
DO NOT attempt a voltage measurement with the test leads in the 20A or the mA terminal.
ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
DO NOT use the multimeter in a potentially explosive atmosphere or where flammable material is present.
ONLY operate the multimeter when the back cover is in place and fastened securely.
If any abnormal readings are observed, the multimeter must be checked out by an authorised technician.
ALWAYS turn off the multimeter and disconnect the test leads, before opening the back cover to replace the fuse or battery.
When not in use, store the multimeter carefully in a safe, dry, childproof location out of direct sunlight. If storing for a long period of time, remove the
battery. Storage temperature range: -15°C to 50°C.
Note: The warnings, cautions and instructions referred to in this manual cannot cover all possible conditions and situations that may occur. It must be
understood that common sense and caution are factors which cannot be built into this product, but must be applied by the operator.
WARNING! Engines produce carbon monoxide which is odourless and causes slower reaction time which could lead to serious injury. An engine which is
operating should be in a well ventilated area, or the vehicle's exhaust should be connected to an adequate fume removal system.
When working on a vehicle which is being tested or repaired ensure that the handbrake is on and the front wheels are chocked to avoid the vehicle moving
and causing injury.
Wear suitable eye protection when testing or repairing a vehicle.
When measuring current, connect the meter in series with the load.
Disconnect the live test lead before disconnecting the common test lead.
The mA and the 20A terminals are protected by fuses. To avoid possible injury or damage, use only in circuits limited to 400mA or 20A for 30 seconds.
To maintain the accuracy of the meter, replace the discharged battery immediately when the symbol 'BAT' appears on the meter display.
Avoid measurement errors from outside interference. Keep the meter away from spark plug and coil wires.
Exceeding the electrical limits of this meter is dangerous and will expose you to serious or possibly fatal injury. Carefully read and understand
the specification limits of this meter together with the warnings and cautions in this safety section.
DO NOT exceed the limits shown in the table below.
FUNCTION
TERMINAL
INPUT LIMIT
DC/AC Volts, Ohm/Continuity/Diode,
CAP., IR-TEMP. Adaptor, Type-K TEMP.,
Hz, % Duty, Ms Dwell, RPM
V-Ω-RPM
600VoltsAC DC
AC/DC
μA / mA
400mA DC/AC
AC/DC20A
20A
*20A DC/AC
* 20 Amp measurement for 30 seconds maximum.
Ohms can not be measured if voltage is present, ohms can be measured only in a non-powered circuit. However, the meter is protected to 600 volts.
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE THE
PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR
PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these instructions, and properly
maintained, give you years of trouble free performance.
The user shall ensure that test probes are correctly selected in order to prevent danger. Probes shall be selected to ensure that adequate barriers guard
against inadvertent hand contact with live conductors under test and that probes have minimal exposed probe tips. Where there is a risk of the probe tip
short circuiting with other live conductors under test, it is recommended that the exposed tip length shall not exceed 4mm.
TA304 Issue:4(I) - 17/06/14
Original Language Version
© Jack Sealey Limited
3. MAIN meter Features
SPECIFICATION:...................................................................Model No: TA304
Tach (RPM):............2-10cyl, 4-Stroke 600-4000 (x1)rpm, 600-12000 (x10)rpm
Dwell:....................................................................................................4/5/6/8cyl
AC Voltage:.............................................................400mV, 4V, 40, 400V, 700V
DC Voltage:...........................................................400mV, 4V, 40, 400V, 1000V
AC Current:........................................400µA, 4000µA, 40mA, 400mA, 4A, 20A
DC Current:........................................400µA, 4000µA, 40mA, 400mA, 4A, 20A
Capacitance:................................. 40nF, 400nF, 4µF, 40µF, 400µF, 4mF, 40mF
Frequency:.............................................................................0.001Hz-9.99MHz
Duty Cycle:..........................................................................................0.1-99.9%
Pulse Width:.........................................................................................0.1-10ms
Resistance:............................................400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
Continuity:........................................................... <30Ω Continuity Buzzer 2kHz
Temperature:........................................................ -20 to +760°C, -4 to +1400°F
IR Temperature:...................................................... -20 to +280°C, -4 to +536°F
Diode Check:................................................................................................. Yes
Back Light:..................................................................................................... Yes
Bar Graph Display:........................................................................................ N/A
Display Hold:................................................................................................. Yes
Auto Ranging:................................................................................................ Yes
Inductive Coupler:......................................................................................... Yes
Digits Height:.............................................................................................20mm
Auto Power Off:.............................................................................................Yes
Low Battery Indicator:...................................................................................Yes
Batteries (supplied):............................................................................. 9V (PP3)
Hi-Impact Case:............................................................................................. Yes
Size (L x W x D):.....................................................................182 x 82 x 55mm
Weight:........................................................................................................360g
fig.1
fig.2
2. introduction & specification
INTRODUCTION: Includes new generation, 15-function, auto-ranging automotive diagnostic multimeter with IR thermometer attachment. Combination digital/
bar-graph display gives accurate indication of component outputs. Large, easy to read high contrast display with bright, white backlight. Workshop-tough, durable
bi-composite case with integral stand and auto power shut-off. High speed processing circuitry reads standard automotive parameters including duty cycle and
pulse width making this tool ideal for testing fuel injection systems. Features auto-ranging, and data hold functions with overload protection on all ranges. Includes
relative functions including Min/Max and Peak Hold. Supplied with Inductive Coupler, IR Thermometer, test probes and thermocouple in carry case.
TA304 Issue:4(I) - 17/06/14
Original Language Version
© Jack Sealey Limited
4.3.
Data Hold (fig.5a)
The Data Hold function allows the meter to "freeze" a measurement for
later reference.
4.3.1. Press the DATA HOLD button to “freeze” the reading on the display.
The “HOLD” symbol will appear in the display.
4.3.2. Press the DATA HOLD button again to return to normal operation.
4.4.
Peak Hold (fig.5b)
The Peak Hold function captures the peak AC or DC voltage or current.
The meter can capture negative or positive peaks as fast as
1 millisecond in duration.
4.4.1. Turn the function switch to the A or V position.
4.4.2. Press and Hold the PEAK button until “CAL” appears in the display. This
procedure will zero the range selected & return the meter to manual
ranging.
4.4.3. Press the PEAK button, Pmax will display.
4.4.4. The display will update each time a higher positive peak occurs.
4.4.5. Press the PEAK button again, Pmin will display. The display will now
update and indicate the lowest negative peak.
4.4.6. To return to normal operation, press and hold the PEAK button until the
Pmin or Pmax indicator switches off. Note: If the Function switch
position is changed after a calibration the Peak Hold calibration must be
repeated for the new function selected.
4.5.
max/min button (fig.6a)
4.5.1. Press the MAX/MIN button to activate the MAX/MIN recording mode.
The display icon "MAX or MIN" will appear. The meter will go to
manual ranging & display and hold the maximum or minimum reading
and will update only when a new “max or min” occurs.
4.5.2. Press the MAX/MIN key and a blinking “MAX MIN” will appear. The
meter will display the present reading, but will continue to update and
store the max and min readings.
To exit MAX/MIN mode press and hold the MAX/MIN key for 2 seconds.
4.6.
Backlight button (fig.6b)
4.6.1. Press the BACKLIGHT button to turn the backlighting ON.
4.6.2. Press the BACKLIGHT button again to turn the backlighting OFF.
fig.5a
fig.5b
fig.6a
fig.6b
4. PUSH BUTTON FUNCTIONS
5. meter FUNCTIONS
4.2.
Mode Button
Press the mode pushbutton to select the following functions;
DC/AC Voltage, DC/AC Current Resistance, Diode, Continuity &
Capacitance
4.1.
Manual Range & Stroke 4/2(DIS),
Hz, %, ms +, CYL Button
Press to this button to select;
STROKE 4, 2DIS, Hz ,%, ms+, CYL range & V/A/ Resistance manual
Range
4.1.1. Manual Ranging
The meter turns on in the autoranging mode. Press the Range button to
go to manual ranging. The display icon " " will appear. Each press of
the range button will step to the next range as indicated by the units and
decimal point location. Press and hold the Range button for two seconds
to return to autoranging.
fig.3
fig.4
5.1.
Voltage (V)
5.1.1. Select the Volts “ V” range with the rotary switch.
5.1.2. The meter will automatically select the best voltage (V) range.
5.1.3. Select DCV or ACV with the MODE button.
5.1.4. Insert Black lead in COM terminal.
5.1.5. Insert Red lead in V-Ω-RPM terminal
5.1.6. Touch the Black probe to ground or to the negative (-) circuit
5.1.7. Touch the Red probe to the circuit coming from the power source
IMPORTANT: Voltage must be measured in parallel (Red probe
measuring circuit from power source).
WARNING: When measuring voltage, be sure the Red test lead is in
the terminal marked “V”. If the test lead is in an Amp (A) or
Milliampere (mA) terminal, you may be injured or the meter damaged.
5.2.
Resistance (Ω)
IMPORTANT: If you are testing an application that has capacitors in the
circuit, be sure to turn the power OFF on the test circuit and discharge all
capacitors. Accurate measurement is not possible if external or residual
voltage is present.
5.2.1. Select the Resistance “ Ω” range with the rotary switch.
5.2.2. Select the Resistance “Ω” function with the Mode button. Please note, the
unit defaults to resistance.
5.2.3. Insert Black lead in COM terminal.
5.2.4. Insert Red lead in V-Ω-RPM terminal
5.2.5. Touch the test lead probes across the resistor to be tested.
5.3.
Diode Check ( )
IMPORTANT: Turn the power OFF to the test circuit
5.3.1. Select the Diode Check " " function with the rotary switch and
mode button.
5.3.2. Insert Black lead in COM terminal.
5.3.3. Insert Red lead in V-Ω-RPM terminal
5.3.4. Touch the Black test probe to the negative (-) side of the diode.
5.3.5. Touch the Red test probe to the positive (+) side of the diode.
5.3.6. Reverse the probes: Black to the positive (+) side and Red to the negative
(-) side.
Note: A “good” diode will read low in one `direction and high in the other direction
when the probes are reversed (or vice versa).
A defective diode will have the same reading in both directions or read
between 1.0 to 3.0 V. in both directions
Diode
(- to +)
Reverse probes (+ to -)
GOOD
0.4 to 0.9V
Over Limit (OL)
Over Limit (OL)
0.4 to 0.9V
BAD
Over Limit (OL)
1.0 to 3.0V
1.0 to 3.0V
Over Limit (OL)
0.4 to 0.9V
0.4 to 0.9V
Over Limit (OL)
Over Limit (OL)
0.000V
0.000V
TA304 Issue:4(I) - 17/06/14
Original Language Version
© Jack Sealey Limited
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