Uni-t UTM 1204A User Manual [ru]

P\N:110401102778

CONTENTS

I. Introduction--------------------------------------------- 1 II.Unpacking Inspection--------------------------------- 1 III.Rules for Safe Operation----------------------------2 IV.Electrical Symbols------------------------------------3 V.Appearance Structure--------------------------------4 VI.Display Symbols-------------------------------------- 5 VII.Key Functions and Automatic Shutdown-------6 VIII.Measurement Instructions------------------------ 7

1.DC Voltage Measurement-------------------------7

2.AC Voltage Measurement-------------------------8

3.Resistance Measurement-------------------------9

4.Diode Measurement------------------------------ 10

5.Conductance Detection-------------------------- 11

6.Capacitance Measurement--------------------- 12

7.Frequency Measurement------------------------13

8.Temperature Measurement---------------------14

9.DC Current Measurement-----------------------15

10.AC Current Measurement-----------------------16 IX.Technical Indicators---------------------------------17 X.Maintenance------------------------------------------ 22

I.INTRODUCTION

UT204A is a 3 3/4-bit AC/DC digital clamp meter (hereinafter referred to as clamp m eter ) with stable performance, safety and reliability. As a special electrician's instrument with excellent performance, machine circuit is designed on the basis of large-scale integrated circuit doubleinteger A/D converter with full-range overload protection circuit and specific appearance design. Clamp meter can be used to measure AC/DC voltage, current, resistance, diode,c ircuit O N/OFF, capacitance, frequency and temperature, etc. The usage manual includes related safety information and warning prompt, etc. Please read content carefully and abide by all warnings and notices strictly.

Warning: Please read Rules for Safe

Operation c arefully b efore u sage o f c lamp m eter.

II.UNPACKING INSPECTION

Please open the package box and take instrument out. Please check if following items are deficient or damaged or not.

1. Usage manual

2. Probe

3. Temperature probe

4. Guarantee certificate 1 sheet

Please contact your supplier instantly if any item is deficient or damaged.

1 book 1 pair 1 probe

III.RULES FOR SAFE OPERATION

Please pay attention to Warning Sign and Cautionary Words . Warning refers to possible danger to user, instrument or measured equipment. The instrument shall be designed and produced according to GB4793 Safety Requirements of Electronic Measuring Instrument, IEC 61010-1 and IEC 1010-2-032 Safety Standard to meet safety standards of duplex insulation, overvoltage CAT II 600V, CAT III 300V and pollution level

Protection ability may be weakened or lost if failing to use clamp meter according to related operation instructions.

1. Please inspect clamp meter and probe before use to avoid damage or abnormal use. Please do not use the clamp meter again if probe or shell insulation is damaged obviously with LCD display failure or clamp meter cannot operate normally.

2. It is strictly prohibited to use clamp meter before covering rear cover and battery cell to avoid electric shock.

3. Fingers cannot exceed probe forehand during measurement. Do not touch nude electric wires, connector, unused input end or circuits during measurement to avoid electric shock.

4. Function switch must be in correct position before measurement. It is strictly prohibited to change gears during measurement to avoid damage of clamp meter.

5. Do not exert at least 600V between terminal of clamp meter and grounding to avoid electric

Shock or damage of clamp meter.

6. To operate the instrument carefully under DC 60V or AC 30V to avoid electric shock.

7. Do not measure voltage or current which is more than permissible input value. Be sure to place function range switch to the maximum range position if scope of measured value cannot be determined. Be sure to cut off circuit power and discharge all capacitors before ON/OFF measurement of online resistance, diode or circuit. To disconnect probe and measured circuit then remove probe from input end of clamp meter and cut off power after measurement.

8. To replace battery in a timely manner during display of LCD display to guarantee high measurement precision. To take battery out if clamp meter has not been used for a long time.

9. Please do not alter internal wiring of clamp meter randomly to avoid instrument damage and safety danger.

10.Do not store or use clamp meter in environment in high-temperature, high-humidity, combustible, explosive and strong current magnetic environment.

11.Please clean the instrument shell by soft cloth and neutral detergent during maintenance. Do not use abrasive or solvent to avoid shell corrosion which may cause instrument damage and safety danger.

V.Appearance Structure (shown in Figure 1)

1. Input end;

2. LCD digit display;

3. Function key: To select basic functions;

4. Measurement function knob: White mark is initially set value; Blue mark is validated after selecting blue key;

5. Clamp head trigger: To press the trigger to loosen clamp head. Clamp head will be tightened again locally if loosening the trigger;

6. Hand protection: It is designed to guarantee safety when hand of users touching dangerous zone;

7. Clamp head: It is a device to measure AC/DC current to convert current to voltage. Single conductor of measured current must pass through center of clamp head perpendicularly;

IV.ELECTRIC SYMBOLS

Duplex insulation AC Diode

Warning prompt AC or DC

To meet European Union standard.

Grounding DC

Deficient battery Buzzing ON/OFF

Figure 1

VI. DISPLAY SYMBOLS (SHOWN IN FIGURE 2)

Figure 2

1. AC signal measurement instructions;

2. Negative polarity instructions;

3. DC signal measurement instructions;

4. Instructions of deficient battery charge;

5. Automatic range instructions;

6. Diode testing instructions;

7. ON/OFF detection instructions;

8. Measurement instructions of duty cycle;

9. Data maintenance instructions;

10. Measurement instructions of relative value;

11. Temperature measurement unit ( );

12. Resistance measurement unit (ohm, kilo-ohm and mega-ohm);

13. Frequency measurement unit (Hz);

14. Capacitance measurement unit (nF and µF);

15. Current measurement unit (A);

16. Voltage measurement unit (mV and V);

1010

88 99

1111

1212

1313 1414

1515

1616

VII. KEY FUNCTIONS AND AUTOMATIC SHUTDOWN

1.HOLD As reading maintenance key, it is to maintain displayed reading by triggering. Displayed value will be locked for constant display by pressing the key once. It can be pressed again to release locking status and return to common measurement status.

2.REL Current display value of clamp meter will be used as reference value after pressing the key. Display will be reset to 0 to minus reference value from measurement result automatically until exiting measurement function of relative value by pressing the key again. relative range can be switched over by pressing the key in and measurement gears.

3.SELECT It is a function selection key for switchover of and measurement gears by triggering. Note: Automatic shutdown function will be cancelled if pressing SELECT key for bootstrap after automatic shutdown.

4.Automatic Shutdown Clamp meter will power off automatically (under sleeping status) to save electric energy if function key and knob switch fail to operate within 15 minutes during measurement. Automatic shutdown function can be cancelled by pressing SELECT key for bootstrap. Clamp meter will start up automatically (under working status) by rotating function key under automatic shutdown status. (Please refer to Clause 6 for effective key operation.)

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