HT instruments HT14N - Manual (Page 7)

HT-14N
EN - 6
4.2.2. AC Voltage measurement
WARNING
Maximum input for AC voltage is 500V . Do not attempt to take any
voltage measurement that exceeds the limits. Exceeding the limits could
cause electrical shock and damage the multimeter.
1. Select a proper range for AC voltage (25, 250 or 500 DC V).
2. If the voltage range is not known beforehand, set the range switch to the highest range
and work down.
3. Insert the two long ends of test leads to the desired circuit, then reading will be
displayed in the corresponding red scale.
4.2.3. DC Current measurement
WARNING
Make sure that circuit under test is powered off before open it to insert test
leads. Do not attempt to take any current measurements in circuits power
with more than 240 V.
1. Power off the circuit under test.
2. Select a proper range for DC current (1, 10, 100 mA).
3. If the current range is not known beforehand, set the range switch to the highest range
and work down.
4. Insert the two test leads in series with the load in which the current is to be measured.
5. Power on the circuit under test.
6. The reading will be displayed in the corresponding black scale.
7. If the analog pointer doesn’t move during current measuring control the fuse inside the
multimeter and replace it if necessary (ref. Paragraph 4.3.3).
4.2.4. Resistance measurement
WARNING
Before taking any in circuit resistance measurement, remove power from
the circuit being tested and discharge all the capacitors.
1. Select a proper range for Resistance (10, 100, 1000
Ω).
2. Short the two probes together and adjust the “0
Ω ADJ” knob to set the pointer at zero
position on the right side of the analog display.
3. If the pointer can’t reach zero position replace the battery with a new one and repeat
step 2 again.
4. Insert the two long ends of test leads to the desired circuit, then reading will be
displayed in the green scale.
5. As measuring resistance, any voltage existing in circuit is not allowed. If a capacitor is
installed, it must be discharged before test.