Uni-T UT171A [11/20] Ut171a b c instructions ut171a b c instructions

Содержание

• Contents 2
• Ut171a b c instructions 2
• I overview 3
• Ii accessories 3
• Iii safety operation criterion 3
• Ut171a b c instructions 3
• Iv electrical symbols 4
• Ut171a b c instructions ut171a b c instructions 4
• V comprehensive specification 4
• Ut171a b c instructions ut171a b c instructions 5
• Vi appearance structure refer to figure 1 vii displayer refer to figure 2 5
• Îbb b b b 5
• Ut171a b c instructions ut171a b c instructions 6
• Viii knob of function selection and button 6
• Ut171a b c instructions ut171a b c instructions 7
• Ix measuring operation instructions 8
• Measuring ac dc voltage see figure 3 8
• Ut171a b c instructions 8
• Measuring of resistance conductivity g figure 4a 9
• Ut171a b c instructions ut171a b c instructions 9
• Measuring of circuit switching 10
• See figure 5 10
• Ut171a b c instructions ut171a b c instructions 10
• Diode test see figure 6 11
• Measuring of capacitance 11
• See figure 7 11
• Ut171a b c instructions ut171a b c instructions 11
• Measuring of frequency duty ratio 12
• Measuring temperature 12
• See figure 8 12
• See figure 9 12
• Ut171a b c instructions ut171a b c instructions 12
• A note 13
• Measuring ac dc see figure 10 13
• Ut171a b c instructions ut171a b c instructions 13
• A 600a aca dca external input 14
• A caution 14
• Current calipers measurement see figure 11 14
• Non contact ac voltage sensing see figure 12 14
• Ut171a b c instructions ut171a b c instructions 14
• Other functions 15
• Square wave output see figure 13 15
• Ut171a b c instructions ut171a b c instructions 15
• A caution 16
• Alnput impedance 16
• Measuring of dc voltage 16
• Ut171a b c instructions ut171a b c instructions 16
• X technical indexes 16
• Measuring of ac current 17
• Measuring of ac voltage 17
• Measuring of dc current 17
• Ut171a b c instructions ut171a b c instructions 17
• Measuring of capacitance 18
• Measuring of frequency duty ratio cycle 18
• Measuring of resistance conductance applicable to ut171b c only 18
• Ut171a b c instructions ut171a b c instructions 18
• Measuring of temperature applicable to ut171b c only 19
• Measuring with current caliper ut171c only 19
• Square wave output ut171c only 19
• Ut171a b c instructions ut171a b c instructions 19
• Ut171a b c instructions ut171a b c instructions 20
• Xi maintenance and repair 20

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UT171A B C Instructions 4 Diode test see Figure 6 UT171A B C Instructions Range of test voltage for diode is about 5 Measuring of capacitance see Figure 7 0 3V Auxiliary displayer displays diod When there is no input instrument will display Caution If diode under test is in open circuit or reverse polarity it will display OL In fixed reading which is the inherent capacitance of instrument When measuring capacitance in small range gear the inherent value must be deducted from measured value to guarantee terms of silicon PN junction 500 800mV measuring precision Therefore it is allowed shall be generally confirmed as normal to utilize function of relative measuring REL value When measuring in circuit diode it is necessary to cut off all the power supply in the circuit under test and discharge residual electric charge in capacitor before measuring Do not input voltage higher than DC 30V or AC 30V so as to prevent personal injury of the instrument to make automatic deduction facilitating measuring reading A Caution If metered capacitance is in short circuit or capacitance is beyond maximum range of the instrument LCD will display OL As for measuring large bulk capacitance it is normal to take seconds to measure Before testing it is necessary to discharge all the residual electric charge in capacitance It is particularly important for high voltage capacitance preventing damage on instrument and personal injury The measured capacitance if stored in a charge may appear in the process of testing the screen display DISCHARGE state 17 Figure 7 18