Tenma 72-7780 - Capacitance, Frequency, and Temperature Measurements; AC;DC Current and NCV Measurements

capacitance)
Notes:
• Ifthetestedcapacitorisshortedoritscapacityis
overthespecifiedrange“OL”symbolwillbe
displayedonthescreen.
• Whenmeasuringlargecapacitors,itmaytakeafew
secondstoobtainsteadyreadings.
• Beforemeasuringcapacitors(especiallyforhigh
voltagecapacitors),pleasefullydischargethem.
6. Frequency/Dutyratiomeasurement(seefigure8) 
Atthefrequencyposition,presstheHz/%toselect
frequency/dutyratiomeasurementmode.
Notes:
• DonotinputvoltageoverDC60VorAC30V.
7. Temperaturemeasurement(seefigure9)
Turnonthedevice,after“OL”symbolappears,insert
K‐thermocoupleintothedevice.
Note:
OnlyK‐typethermocoupleisapplicable.Themeasured
temperatureshouldbelessthan230˚C/446˚F
(˚F=˚C*1.8+32)

8. AC/DCcurrentmeasurement(seefigure10)
Connecttestleadswiththetestedcircuitinseries.
ReadingsunderthisACmeasurementistrueRMS.
Notes:
• Beforemeasuring,switchoffthepowersupplyof
thecircuit.
• Iftherangeofthemeasuredcurrentisunknown,
selectthemaximumrangeandthenaccordingly
reduce.
• Therearefusesinside10AjackandmA/μAjack.Do
notconnectthetestleadswithanycircuitsin
parallel.
• Ifthetestedcurrentisover5A,eachmeasurement
timeshouldbelessthan10secondsandthenext
testshouldbeafter15minutes.
• WhenmeasuringACcurrent,pressHz/%buttonto
displayACfrequencyordutyratio.
• 60AACandDCcurrentclampmeasurement(see
figure11) 
Connectasshownwiththeat tachedcurrentclamp.
9. NCVmeasurement(seefigure12)
1） SwitchthedialtoNCVposition