Mastech my68 Instruction Manual page 11

3.2.4 3.2.4 Continuity Continuity Check Check
3.2.4 Continuity 3.2.4 Continuity Check Check
To To avoid avoid electrical electrical shock shock
To To avoid avoid electrical electrical shock shock and/or
instrument, instrument, instrument, instrument, disconnect disconnect disconnect disconnect
discharge all high-voltage
discharge discharge discharge all all all high-voltage high-voltage high-voltage capacitors
testing testing testing testing for for Continuity. for for Continuity. Continuity. Continuity.
Continuity is a complete path for current flow.
The beeper sounds if a circuit is complete. These brief
contacts cause the Meter to emit a short beep.
To test for continuity:
1. Set the rotary switch to
/ / / /
2. Press the key to activate Continuity Check.
3. Connect the black and red test leads to the COM and
Ω terminals respectively.
4. Connect the test leads to the resistance in the circuit
being measured.
5. When the test lead to the circuit is below 50 Ω , a
continuous beeping will indicate it.
Note: Note: Note: Note:
¥
Continuity test is available to check open/short of the
circuit.
3.2.5 Capacitance 3.2.5 3.2.5 3.2.5 Capacitance Capacitance measurement Capacitance measurement measurement measurement
To To To avoid To avoid avoid avoid electrical electrical electrical electrical shock shock shock and/or shock
instrument, instrument, disconnect disconnect
instrument, instrument, disconnect disconnect
discharge discharge discharge all discharge all all all high-voltage high-voltage high-voltage high-voltage capacitors
measuring measuring capacitance. capacitance.
measuring measuring capacitance. capacitance. Use
function function function to to to to confirm function confirm confirm confirm that
discharged. discharged.
discharged. discharged.
Capacitance is the ability of a component to store an
electrical charge.
17
and/or and/or damage damage to to to to the damage the the
and/or damage the
circuit circuit circuit circuit power power power power and and and and
capacitors before
capacitors before capacitors before before
range.
and/or and/or and/or damage damage to to to to the damage damage the the the
circuit circuit power power and and
circuit circuit power power and and
capacitors capacitors capacitors before before before before
Use Use the the dc dc voltage voltage
Use the the dc dc voltage voltage
that that that the the capacitor the the capacitor capacitor capacitor is is is is
The unit of capacitance is the farad (F). Most capacitors are
in the nanofarad to microfarad range. The Meter measures
capacitance by charging the capacitor with a known current
for a known period of time, measuring the resulting voltage,
then calculating the capacitance. The measurement takes
about 1 second per range.
The Meter's capacitance ranges are 4.000nF 40.00nF,
400.0nF, 4.000µF, 40.00µF and 200.0µF.
To measure capacitance:
1. Set the rotary switch to Cap Cap Cap range. Cap
2. Connect the black and red test leads to the COM
terminals respectively.
3. Connect the test leads to the capacitor being measured
and read the displayed value.
Some Some tips tips for for measuring measuring capacitance: capacitance:
Some tips Some tips for for measuring measuring capacitance: capacitance:
¥ The meter may take a few seconds (200 µ F range, 30
seconds) to stabilize reading. This is normal for high
capacitance measuring.
¥ To improve the accuracy of measurements less than 4nF,
subtract the residual capacitance of the Meter and leads.
3.2.6 3.2.6 Frequency Frequency measurement measurement
3.2.6 Frequency 3.2.6 Frequency measurement measurement
Do Do Do not Do not not measure not measure Frequency measure measure Frequency on Frequency Frequency
(>250V) (>250V) to to to to avoid avoid electrical
(>250V) (>250V) avoid electrical avoid electrical shock electrical
damage damage damage to to to to the damage the the the instrument. instrument. instrument. instrument.
1. Set the rotary switch to Hz Hz Hz Hz range.
2. Connect the black and red test leads to the COM and Hz
terminals respectively.
3. Connect the test leads across the source or load under
measurement, and read the displayed value.
Note: Note:
Note: Note:
¥ In noisy environment, it is preferable to use shield cable for
measuring small signal.
18
COM COM Cx Cx
COM and Cx Cx
on high on on high high voltage high voltage voltage voltage
shock hazard and/or
shock hazard shock hazard and/or hazard and/or and/or