4
Measuring AC Current
(MP730007 only)
Insert the black test lead into COM terminal. If the current under test ≤ 200mA, insert
the red test lead into VΩmA terminal. If the current is higher, insert the red test lead into
the 10A terminal.
•
Turn the range selector to AC/DC range, and connect the test probes with the
circuit being measured in series.
Notes:
•
If the current to be measured is unknown, choose the maximum measuring range
(10A) and reduce it step by step until a satisfactory reading is obtained.
•
Disconnect from the circuit under test when changing the range.
•
If the display only shows “OL”, it indicates the measured current is out of range. In
this case, turn the range selector to a higher range.
Measuring Resistance
•
Insert the test leads into the input terminals (red to VΩmA and black to COM).
•
Turn the range selector to Ω range, and connect the test probes to the resistor
being measured.
Notes:
•
If the measured resistance is out of the range selected, “OL” will be displayed and
you should select a higher range. It normally takes several seconds to display a
stable reading in a high-resistance (>1MΩ) measurement.
•
When there is no input, such as in open-circuit condition, the instrument will
display “OL”.
•
When making an in circuit measurement, disconnect all power supplies and
discharge all the capacitors.
•
When measuring low resistance, the test leads will produce 0.1Ω-0.2Ω
measurement error. To obtain accurate measurement, short the test leads and use
REL function.
•
If the resistance when shorted is more than 0.5Ω, please check if test leads are
loosened or damaged.
•
Do not input over 60V DC or 30V AC or it will pose shock hazard.
Testing Continuity
•
Insert the test leads into the input terminals (red to VΩmA and black to COM, the
polarity of the red test lead is “+”).
•
Turn the range selector to continuity range.
•
Connect the test probes with the load in parallel. The reading is displayed.
•
If the measured resistance >51
Ω
indicates an open-circuit.
•
If the measured resistance <100
Ω
the circuit is in good conduction and buzzer will
sound.
Diode Testing
•
Switch the
range selector
to diode position
•
Insert the red test lead to
VΩmA
terminal, black to COM terminal.
•
Red test lead to positive pole, black to negative pole. Reading is displayed.
•
“OL” symbol appears when the diode is open or polarity is reversed. For silicon PN
junction, normal value: 500 - 800mV (0.5 - 0.8V).
Notes:
•
The voltage for testing diode is about 4.0V/1.5mA.
