Sealey TA202 - Manual (Page 3)

 WARNING! Ensure that you read, understand and apply the safety and operational instructions before connecting the meter . Only when you are sure that
you understand the procedures is it safe to proceed with testing .
 WARNING! Risk of electrocution . High voltage circuits, both AC and DC are very dangerous and should be measured with great care .
Operating temperature range 0 °C to 40°C .
Remember to turn on meter before use and to turn it off when measurement is completed .
Note: IF “OL” appears in the display during a measurement, the value exceeds the range you have selected . Change to a higher range .
Note: On some low AC and DC ranges, with the test leads not connected to a device, the reading may show a random fluctuating reading . This is
normal and is caused by the high input sensitivity . The reading will stabilise and give a proper measurement when connected to a circuit .
4.1. Mode Button (fig .1 .10)
4 .1 .1 . To select AC/DC voltages, AC/DC current, Resistance, Diode, Continuity and Capacitance check .
4 .2 . Stroke Button 4/2 (DIS) Hz, %, ms CYL range button . (fig .1 .9 .) .
4 .2 .1 . To select stroke 4/2 (DIS) Hz, %, ms CYL range .
4.3. Data Hold, Backlight Button (fig .1 .7 .)
4 .3 .1 . The data hold function allows the meter to freeze a measurement for later reference .
4 .3 .2 . Press the data hold button to freeze the reading in the display . The indicator “hold” will appear in the display .
4 .3 .3 . Press the data hold button to return to normal operation .
4 .3 .4 . Press and hold the data button for two seconds to to switch on the display backlight .
4 .3 .5 . Press and hold the data button again for two seconds to turn off the backlight .
4.4. Relative Button (fig .1 .8 .)
4 .4 .1 . The relative measurement feature allows you to make measurements relative to a stored reference value . A reference voltage, current etc can be stored
and measurements made in comparison to that value . The displayed value is the difference between the reference value and the measured value .
4 .4 .2 Perform any measurement as described in the operating instructions .
4 .4 .3 . Press the relative button to store the reading in the display and the “REL” indicator will appear in the display .
4 .4 .4 . The display will now indicate the difference between the stored value and the measured value .
4 .4 .5 . Press the relative button to return to normal operation .
4.5. AC or DC Voltage Measurements
4 .5 .1 . Insert the black test lead into the negative “COM” jack and the red test lead into the positive “V” jack .
4 .5 .2 . Turn the rotary switch to the VDC/AC position .
4 .5 .3 . Press the “MODE” button to select ac or dc voltage .
4 .5 .4 . Touch the test probes to the circuit under test and read the voltage display .
Note: Pressing the Hz button (fig1 .9 .) while in the voltage function will switch the display to frequency or duty cycle .
4.6. AC or DC Current Measurements
 WARNING! Do Not make current measurements on the 20A scale for longer than 30 seconds in every 15 minutes. Exceeding 30 seconds may
cause damage to the meter and test leads.
4 .6 .1 . Insert the black test lead into the into the negative “COM” jack and the red test lead into the:
a) Positive uA/mA jack for currents to 400mA (fig .1 .5 .)
b) Positive 20A jack for currents to 20A (fig .1 .6 .)
4 .6 .2 . Turn the rotary switch to the uA, mA or A position .
4 .6 .3 . Press the mode button to select AC or DC current .
4 .6 .4 . Touch the test probes in series with the circuit under test and read the current on the display .
4.7. Resistance, Diode, Continuity or Capacitance Measurements
 WARNING! To avoid electric shock, disconnect power to unit under test and discharge all capacitors before taking any resistance or
capacitance measurements.
4 .7 .1 . Insert the black test lead into the negative “COM” jack and the red test lead into the positive Ω CAP jack .
4 .7 .2 . Turn the rotary switch to the Ω CAP position .
4 .7 .3 . Press the Mode button (fig . 1 .1 .) to select Ω or or or CAP .
4 .7 .4 . Connect the test probes to the two ends of the Resistance, Diode, Continuity, Capacitance or circuit to be measured .
4 .7 .5 . Read the measured value from the display .
4 .7 .6 . When on continuity range a beeping will be heard if the resistance is lower than 150Ω .
4 .7 .7 . When measuring the forward voltage across a good Diode will indicate 0 .4V or 0 .7V will be indicated and the reverse voltage will indicate “OL” (same as
on open condition) . For a short circuit diode, a value of 0mV will be displayed .
 WARNING! When checking in-circuit capacitance, be sure to disconnect the power supply from the circuit and that the capacitors are fully
discharged. The range control mode in capacitance measurement is auto-ranging.
4.8. Frequency or Duty Cycle measurements
4 .8 .1 . Insert the black test lead into the negative “COM” jack and the red test lead into the positive “Hz” jack .
4 .8 .2 . Turn the rotary switch to the “Hz %DUTY” position .
4 .8 .3 . Press the Hz % button (fig .1 .9 .) to select Hz or % .
4 .8 .4 . Touch the test probes to the circuit under test and read the frequency or duty cycle on the display .
4.9. Temperature Measurements
4 .9 .1 . Insert the type K thermocouple plug into the negative “COM” jack and the positive jack ensuring the + symbol on the plug is inserted into the positive +
jack and the negative symbol on the plug is inserted into the negative “COM” jack .
4 .9 .2 . Turn the rotary switch to the select °C or °F .
4 .9 .3 . Read the temperature on the display .
4.10. Pulse Width Measurements
4 .10 .1 . Insert the black test lead into the negative “COM” jack and the red test lead into the positive + jack .
4 .10 .2 . Turn the rotary switch to the PULSE WIDTH position .
4 .10 .3 . Connect the black test probe to ground and the red test probe to the signal wire that connects to the component to be measured .
Note: The applied time for most fuel injector is displayed on the negative (-) slope .
4.11. RPM (TACH) Measurements
4 .11 .1 . Select the RPM range with the rotary switch .
4 .11 .2 . Select the X10 RPM range with the rotary switch . Multiply the displayed reading times by 10 to get the actual RPM .
4 .11 .3 . Press STROKE button (fig .1 .9 .) to select through RPM 4 for 4-stroke or RPM 2 for 2-stroke
4 .11 .4 . Insert the inductive pickup leads into the meter . Black lead into the negative “COM” jack and the red lead into the positive RPM jack (fig .1 .4 .) .
4 .11 .5 . Connect the inductive pickup to a spark plug HT lead . If no reading is received, unhook the clamp, turn it over and connect again .
Note: Connect the pickup as far away from the distributor and exhaust manifold as possible .
Position the pickup to within six inches of the spark plug or move it to another plug HT lead if no reading or an erratic reading is obtained .
Note: RPM4: For RPM of 4-stroke engines which have 1 ignition on every 4 engine strokes .
RPM2: For RPM of DIS (Distributor-less Ignition System) and 2 -stroke engines which have 1 ignition on every two strokes .
4.12. Dwell Angle Measurement
Dwell angle is the number of degrees through which the distributor cam rotates while the breaker points are closed .
4 .12 .1 . Insert the black test lead into the negative “COM” jack and the red test lead into the positive + jack .
4 .12 .2 . Turn the rotary switch to the corresponding position of 4CYL, 5CYL, 6CYL, 8CYL on the dwell range .
4 .12 .3 . Set number of cylinders with the CYL button (fig .1 .9 .) .
4 .12 .4 . Connect the black test lead to the Ground terminal (-) on the car battery and the red test lead to the contact breaker points or the negative (-) terminal
of the ignition coil .
4 .12 .5 . When the engine is started the Dwell will be displayed .
Note: To reduce the dwell angle reading the points gap must be increased, to increase the dwell angle the points gap must be reduced .
Refer to your owners handbook for detailed procedures for dwell settings and adjustments .
Original Language Version
© Jack Sealey Limited
4. OPERATION
TA202 Issue No: 3(L) - 17/06/14