5.8.
ac or Dc current measurements
Warning! Do not make current measurements between 1a and 20a for longer than 30 seconds in every 15 minutes.
exceeding 30 seconds may cause damage to the meter and test probes.
5.8.1.
Insert the black test probe into the into the negative “CoM” terminal and the red test probe into the:
a) Positive 20a terminal
for currents to 20A (fig.1.6).
b) Positive ma terminal
for currents to 320mA (fig.1.7).
note:
If you are unsure of the current draw select the 20A terminal.
5.8.2.
Turn the rotary switch to the 20A or mA position.
5.8.3.
Press the Alternate Function button to select ac or dc current.
5.8.4.
Touch the test probes in series (fig.2) with the circuit under test and read the current on the display.
5.9.
resistance
Warning! to avoid electric shock, disconnect power to unit under test and discharge all capacitors before taking any
resistance measurements.
Warning! ohms cannot be measured if a voltage is present. only measure in non powered circuits.
5.9.1.
Insert the black test probe into the negative “CoM” terminal and the red test probe into the positive main positive terminal (fig.1.10)
terminal.
5.9.2.
Turn the rotary switch to the Ω position.
5.9.3.
Connect the test probes to the two ends of the Resistance circuit to be measured.
5.9.4.
Read the measured value from the display.
5.9.5.
In resistance measurements, if greater accuracy is required press the Range button.
5.10.
DioDe / continuity measurements
Warning! to avoid electric shock, disconnect power to unit under test and discharge all capacitors before taking any
resistance measurements.
5.10.1. Insert the black test probe into the negative “CoM” terminal and the red test probe into the positive main positive terminal (fig.1.10)
terminal.
5.10.2. Turn the rotary switch to the position.
5.10.3. Press the Alternate Function button (fig.1.2) to select diode or Continuity.
5.10.4. Connect the test probes to the two ends of the diode or Continuity circuit to be measured.
5.10.5. Read the measured value from the display.
5.10.6. When measuring the forward voltage across a good diode, it will indicate 0.4V or 0.7V and the reverse voltage will indicate “ol”
(same as on open condition). For a short circuit diode, a value of 0mV will be displayed.
5.10.7. In continuity mode a complete circuit will beep continuously, if open circuit, there will be no beep.
5.11.
frequency (Hz)
5.11.1. Insert the black test probe into the negative “CoM” terminal and the red test probe into the positive main positive terminal (fig.1.10)
terminal.
5.11.2. Turn the rotary switch to either of the “Hz” positions (320Hz, 3200Hz, 32kHz).
5.11.3. Connect the negative “CoM” test probe to ground.
5.11.4. Connect the positive main positive terminal (fig.1.10) test probe to the “signal out” wire of the sensor to be tested.
5.12.
Duty cycle (%)
5.12.1. Insert the black test probe into the negative “CoM” terminal and the red test probe into the positive main positive terminal (fig.1.10)
terminal.
5.12.2. Select the %dUTY range with the rotary switch.
5.12.3. Connect the negative test probe to ground.
5.12.4. Connect the positive test probe to the signal wire circuit.
5.13.
temPerature measurements
5.13.1. Insert the type K thermocouple plug into the negative “CoM” terminal and the positive terminal ensuring the + symbol on the plug is
inserted into the po terminal and the negative symbol on the plug is inserted into the negative “CoM” terminal.
5.13.2. Turn the rotary switch to the select °C or °F.
5.13.3. Read the temperature on the display.
5.14.
rPm (tacH) measurements
5.14.1. Select the rpm range with the rotary switch.
5.14.2. Select the x10 rpm range with the rotary switch. Multiply the displayed reading times by 10 to get the actual rpm.
5.14.3. Press the rpm mode button (fig.1.4) to select through rpm 4 for 4-stroke or rpm 2 for 2-stroke dIS.
note: rPm4 for rPm of 4-stroke engines which have 1 ignition on every 4 engine strokes.
rPm2 for rPm of Dis (Distributerless ignition system) & 2-stroke engines which have 1 ignition on every 2 engine strokes.
5.14.4. Insert the inductive pick-up leads into the meter. Black lead into the negative “CoM” terminal and the red lead into the positive RPM
terminal.
5.14.5. Connect the inductive pick-up to a spark plug HT lead. If no reading is received, unhook the clamp, turn it over and connect again.
note:
Connect the pick-up 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. The inductive pick-up has an adjustable sensitivity switch that may also be used to correct an unstable reading.
TA302 Issue 3 (HF) 02/10/18
Original Language Version
© Jack Sealey limited
