7
Resistance Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION
.
1. Set the selector switch to the appropriate
Ω range to be used.
2.
Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack.
3. Short the leads by touching the probes together. Pointer should read zero
at the right hand end of the upper
most scale, if it doesn’t, use the Ohm
adjust knob on the right hand of the panel to line up the pointer with zero.
(If pointer can’t be brought to zero, replace battery.)
4. Connect the test leads across the resistance to be measured.
5.
Take reading on the top “Ω” scale and multiply it by the multiplication
factor indicated by the selector switch.
6. If there is little or no pointer movement from the left side of the scale,
reset the selector switch to higher range. The effective reading scope on
an Ohm meter scale is within the area of between 25 degree of Arc left
side to the Midscale and 25 degree right side to the Midscale.
NOTE:
If connected incorrectly with the voltage, this tester can be
automatically restored to the normal working within 1 minute after taking off
the test leads or the voltage load from the tester without any damage. (This
tester can afford the voltage <250V DC/AC rms. for the period of 30 seconds
max.)
Diode Measurement
1. Set the selector switch to the appropriate
Ω range to be used.
NOTE:
To test the diode while current below 0.060 mA at X 10K range;
current below 0.15 mA at X 1K range; current below 1.5 mA at X 100
range; current below 15 mA at X 10 range; current below 150 mA at X 1
range.
2.
For IF (forward current) test
, put the BLACK test lead to the “-COM”
jack and the R
ED test lead to the Red “+” jack. And then connect the
Black probe to the Positive terminal of the Diode, the Red probe to the
Negative terminal of the Diode.
For IR (reverse current) test
, reverse the connection.
3. Read the value IF or IR of the diode on the LI scale.
4. Read the linear (forward voltage) VF of the diode on the LV scale.
Continuity Test
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION
.
Set the selector switch to the BUZZ range. Connect the test leads to two
points of circuit. If the resistance is lower than 200 Ohm approx., the Beeper
sounds.
NOTE:
Battery voltage is sufficient for Buzzer operation as long as the Zero
Ohm pointer can be adjusted to the Zero scale place.
