Tenma 72-7780 - Measurement Operation Instructions

NCV Non‐contactvoltage
OFF shutdown
Buttons：
RANGE：Switchtherangemodetoauto/manualandthencyclethroughallranges.To
exitauto/manualmode,pressthebuttonfor2secondsorswitchthefunctionaldial.
(OnlyforV,Ω,I  measurement)
MAX/MIN：StartsandstopsMax/Minrecording.Toexitthismode,pressthebutton
for2secondsorswitchthefunctionaldial.(OnlyforV,Ω,I and˚C/˚F
measurement)
REL：Savethefirstreadingasreferencevalue.Thesecondreading=second
measurementvalue‐referencevalue.Toexithismode,pressthebuttonfor2seconds.
(OnlyforV,Ω,I and˚C /˚Fand  measurement);whenmeasuringcapacitance,
RELbuttonisonlyusedforeliminatingintrinsicvalue.
Hz/%：WhenmeasuringACvoltage/current,pressthebuttontocyclethrough
frequencyanddutyratiomeasurement.
SELECT：Selectfunctions.UnderACmodes,longpressthebuttonuntilUFCappears
toenterVFCmeasurementmodeandmeasurethevariablefrequencyvoltage.Long
pressgaintoexitVFCmeasurementmode.
HOLD：Pressthebuttononcetoholdthereading.Pressagaintounlockthereading
andentergeneralmeasurementmodes.
IX. Operationinstructions
Toavoidfalsereading,replacethebatteryifthebatterylowpowersymbol
appears.Alsopayspecialattentiontothewarningsignbesidesthetestlead
housing,indicatingthatthetestedvoltageorcurrentmustnotexceedthevalues
listedonthedevice.
1. AC/DCvoltagemeasurement(seeFigure3)
1) Connecttestleadswiththeloadinparallel.
2) Wheninputimpedanceabout10MΩ,thereis
measurementerrors.Inputimpedance≤10kΩ,
measurementerrorscanbeignored(≤0.1%)
Notes:
• Donotmeasurevoltageover600Vrms,oritmayexpose
userstoelectricshockanddamagethedevice.
• Pleasepayextraattentionwhenmeasuringhighvoltagein
ordertoavoidelectricshock.
2. Resistancemeasurement(seefigure4a)
Connecttestleadswiththeresistanceinparallel.
Warnings:
• Iftheresistorisopenorovertherange,the“OL”symbol
willbedisplayedonthescreen. 
• Beforemeasuringresistance,switchoffthepowersupply
ofthecircuit,andfullydischargeallcapacitors.
• Whenmeasuringlowresistance,thetestleadswillproduce
0.1Ω~0.2Ωmeasurementerror.Toobtainaccurate