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KYORITSU KEW 1109, Инструкция по эксплуатации

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KYORITSU KEW 1109 Скачать руководство пользователя страница 23

̶ 21 ̶

⑷

  The  meter  pointer  deflects  close  to  full  scale  when  the  forward 

current I

F

 is measured. However, it hardly deflects when the reverse 

current I

R

 is measured.

     The forward voltage of the average germanium diode measures 0.1 V 

to 0.2V and that of the silicon diode 0.5V to 0.8V.

⑸

  Since the maximum open circuit voltage at the low resistance ranges 

is 3V (12V at X 10k range), it is possible to light up an LED having a 

forward voltage of more than 1.5V and measure forward current I

F

 as 

well. The reading on the LI scale indicates the forward current I

F

 at 

which the LED lights up. The reading on the LV scale also indicates 

the forward voltage V

F

     For  testing  a  large  LED  use  the  X1  Ω  range.  For  a  smaller  LED 

having less than 10mA IF use the X10Ωrange.

Diode Test

Fig.4

I

R

 

<

 

<

 I

F

 

N(-COM)

I

R

I

F

P(

＋

)

×

10

×

1

×

1k

Содержание KEW 1109

Страница 1: ...INSTRUCTION MANUAL ANALOGUE MULTIMETER KEW 1109S ...

Страница 2: ...6 1 Preparation 11 6 2 DC Voltage Measurements 12 6 3 AC Voltage Measurements 13 6 4 Low Frequency dB Measurements 14 6 5 AC Output Voltage Measurements Using Output Terminal 15 6 6 DC Current Measurements 16 6 7 Resistance Measurements 17 6 8 Terminal Current LI Terminal Voltage LV Diode Test 20 6 9 Measuring ICEO leakage current of transistors 22 6 10 Measuring hFE DC Current Amplification Facto...

Страница 3: ...s a warning for the user to avoid electric shock hazard The symbol on the instrument means that the user must read the instructions in this manual for safe operation of the instrument CAUTION This is a caution for the user to avoid damage to the instrument WARNING Never open the back case during measurements Never use the instrument to measure voltage higher than 250V on an industrial power line W...

Страница 4: ... vibration in transit Note Take good care not to make voltage measurements with the range selector switch at the 250mA DC position The fuse may blow or instrument get damaged Do not expose the instrument to the direct sun extreme temperature and humidity or dew fall for a long period Also care must be taken not to give a shock to the instrument by dropping or inadequate handling Since the meter co...

Страница 5: ...derstand the basic differences between current and voltage measurements for proper use of multimeters Voltage measurements are designed to detect potential difference between two points Make certain that the multimeter is connected in parallel with the circuit under test Current measurements are intended to monitor the consumption of current in the circuit resulting from the application of voltage...

Страница 6: ...e i n g consumed by a resistor IM Meter Current IR Load Current E Power Source Voltage RM Internal Resistance of Multimeter Fig 1 IR IM IR IM RM IR E RM IR IM IR IR Power Source Power Source E E Load Load RM DC V Range DC mA Range COM COM RM 0 V mA mA Battery Power Source Battery Power Source Battery Power Source Battery Power Source Resistor Load Resistor Load ...

Страница 7: ...d accurate reading 19 measuring ranges for a wide scope of application OUTPUT terminal to cut off the DC component of AC voltage being measured hFE scale for transistor checking dB scale 10 62dB Safety designed input terminals and test leads ...

Страница 8: ...voltage approx 150mV terminal voltage approx 550mV 3 of full scale Resistance 4 ranges 0 2kΩ 20Ω mid scale 0 20kΩ 200Ω mid scale 0 2MΩ 20kΩ mid scale 0 20MΩ 200kΩ mid scale 3 of scale length Current across Terminals at Resistance Range LI 4 ranges 0 150mA x1 range 0 15mA x10 range 0 150μA x1k range 5 of scale length Battery voltage at 3V 0 60μA x10k range Battery voltage at 12V Voltage across Term...

Страница 9: ...acteristic chart DC Current Amplication Factor hFE 1 range hFE 0 1000 atΩ 10 range 3 of scale length Dimensions 100 W x 150 L x 47 D mm Weight Approx 330g Accessories Test Leads Model 7066A 1 set F250V 0 5A fuse 2 pcs including one spare fuse also installed into the housing case 1 5V Battery Type R 6P SUM 3 AA or equivalent 2 pcs Installed into the instrument 9V Battery Type 6F22 006P PP3 or equiv...

Страница 10: ...8 4 Instrument Layout Meter Pointer Meter Zero Adjust Screw OUTPUT Terminal P Terminal COM N Terminal Front Panel Mirrored Scale Plate Meter Window Housing Case Ohm Zero Adjust Knob Range Selector Switch ...

Страница 11: ...anges 10V 50V 250V 1000V C10 B50 B250 B10 X1 X1 X1 X100 COM DC Current 4 ranges 50μA 2 5mA 25mA 250mA B50 B250 B250 B250 X 1 X0 01 X0 1 X1 COM Resistance 4 ranges X1Ω x10Ω x1kΩ X10kΩ A 0 2k A0 2k A0 2k A0 2k X1 X10 X1k X10k COM Current across Terminals LI 4 ranges X1Ω X10Ω X1kΩ X10kΩ E15 E15 E15 E15 X10 mA X1 mA X 10 μA X 4 μA COM Voltage across Terminals LV 4 ranges x1Ω X10Ω X1kΩ X10kΩ F3 F3 F3 F...

Страница 12: ...V 1000V C10 B 50 B 250 B10 X1 X1 X1 X 100 Output COM Low Frequency Output dB 4 ranges 10V 50V 250V 1000V G 10 22dB G 10 22dB G 10 22dB G 10 22dB X1 X1 14dB X1 28dB X1 40dB COM or Output COM DC Current Amplification Factor hFE 4 ranges X10Ω D 0 1000 X1 COM A B C E D F G ...

Страница 13: ...use is the absence of batteries or the blown fuse Refer to section 7 With the range selector switch set to the x1Ω range position short the tips of the test leads together Turn the ohm zero adjust knob and make certain that the meter pointer moves to the 0 mark on the right end of the ohm scale If not the battery voltage is insufficient Replace all of the 1 5V batteries R6P SUM 3 or equivalent Ref...

Страница 14: ...h set to the DC mA or ohm range position or the test lead erroneously connected to the AC 15A terminal This may not only damage the instrument or blow the fuse but also cause an injury to the operator Applications Measuring voltage on batteries electrical appliances bias voltage of IC of transistor circuits and any other DC voltages Insert the red test lead into the terminal of the instrument and ...

Страница 15: ...ge selector switch set to the DC mA or ohm range position This may not only damage the instrument or blow the fuse but also cause an injury to the operator Applications Measuring voltage on household and factory electrical installations especially those for lighting commercial power lines power supply circuits taps of transformers etc Insert the red test lead into the positive terminal of the inst...

Страница 16: ... zero dB power level of 0 001 watt one milliwatt across 600 ohms or 0 775V AC across 600 ohms therefore output in a 600 ohms impedance circuit can be read directy from the dB scale When the impedance of a measuring circuit is not 600 ohms however a dB reading obtained is simply the result of measuring an AC voltage on the corresponding dB scale To measure decibels read the dB scales in accordance ...

Страница 17: ...ge selector switch set to the DC mA or ohm range position This may result in instrument damage fuse blow or a possible injury to the operator Note The blocking capacitor connected in series with the OUTPUT terminal may change the AC voltage response at low frequencies The lower the Low Frequency Output the more apparent the change The AC voltage response also changes at higher frequencies due to t...

Страница 18: ...e Low Frequency Output measurements in accordance with the instructions given for AC voltage measurements Table 2 Frequency Characteristics 6 6 DC Current Measurements WARNING Make sure that the test leads are securely connected to the circuit If the test prods are disconnected inadvertently a high voltage may develope in the circuit WARNING Never apply voltage to the current ranges The fuse could...

Страница 19: ...test When the reading is below 25mA set the range selector switch to the lower range for more accurate reading and proceed with the measurement 6 7 Resistance Measurements WARNING Be sure to turn off power to the circuit under test before making resistance measurements WARNING Never apply voltage to the ohm ranges The fuse could blow or the instrument get damaged Especially when a voltage higher t...

Страница 20: ...the black test lead into the COM terminal Set the range selector switch to the desired range position With the test lead tips shorted together turn the zero ohm adjust knob so that the meter pointer lines up with the zero mark at the right end of the ohm scale Turn off power to the circuit under test Connect the test leads to both ends of the circuit under test and take the reading Fig 2 Resistanc...

Страница 21: ...sed for resistance measurements with output voltage from the COM terminal being positive and output voltage from the terminal negative Fig 3 A good knowledge of this relationship will be helpful in testing semi conductors such as transistors and diodes as well as electrolytic capacitors Polarity of Multimeter Terminals at Resistance Measurements Fig 3 LV LI COM Terminal Terminal ー 0ΩADJ ...

Страница 22: ...ed or the voltage applied to the circuit Also an abnormal condition may develope in the circuit due to its self heating Therefore make resistance measurements at each range w ith the above in full consideration Shown below are the values of terminal current and voltage on each resistance range Table 3 Resistance Range X1 X10 X1k X10k Multiply by 10 Direct Reading 10 4 Max Terminal Current LI 150mA...

Страница 23: ... open circuit voltage at the low resistance ranges is 3V 12V at X 10k range it is possible to light up an LED having a forward voltage of more than 1 5V and measure forward current IF as well The reading on the LI scale indicates the forward current IF at which the LED lights up The reading on the LV scale also indicates the forward voltage VF For testing a large LED use the X1 Ω range For a small...

Страница 24: ...the rating of a transistor before testing Use the resistance measuring ranges to test transistors Insert the red and black test leads into the P and N COM terminals respectively With the tips of the test leads shorted together turn the ohm zero adjust knob so that the meter pointer lines up with the 0 mark on the right end of the ohm scale Connect the test leads to the transistors according to the...

Страница 25: ...the amount slightly differs with the types of the transistor Use Table 4 below to determine if the germanium transistors are good or bad Table 4 Leakage Current ICEO of Germanium Transistors Small Medium Sized Transistors Large Sized Transistors Approx 0 1 2mA Approx 1 5mA If the leakage current exceeds the above values appreciably the transistors are faulty E EMITTER E EMITTER B BASE B BASE C COL...

Страница 26: ...of a certain resistance value approx 24kΩ is connected across the N COM terminal of the instrument and the base of the transistor base terminal current IB determined by R approx 24kΩ flows and current IC multiplied by hFE also flows into the collector of the transistor resulting in the increase of DC current and thus causing the meter indication to change notably Theoretically the hFE lC lB of a t...

Страница 27: ...Fig 8 is on the market and is recommended for use in making hFE measurements Test Lead Set for hFE Measurements Fig 8 Fig 9 Test Lead 1 Test Lead 2 Test Lead 1 Test Lead 2 R 24kΩ B C E hFE hFE B B C C E E P P N COM N COM X10 hFE X10 hFE NPN Type Transistor PNP Type Transistor E EMITTER C COLLECTOR B BASE ...

Страница 28: ... hFE test lead 1 to the collector and base terminals of the transistor respectively Clip E of the hFE test lead 2 to the emitter of the transistor When the transistor is good the indicated value is small representing leakage current ICEO only with the base terminal open lB 0 If base terminal DC current IB flows collector terminal DC current IC changes and meter gives a reading of the current incre...

Страница 29: ...e by unscrewing the case fixing screw to replace the fuse When 2 x1 5V battery R 6P SUM 3 or equivalent are exhausted it is no longer possible to zero ohm adjust on the x 1Ω range Remove the housing case by unscrewing the case fixing screw to replace the batteries Observe correct polarity when replacing the batteries When the 9V battery 6F22 006P or equivalanet is exhausted it is no longer possibl...

Страница 30: ... 28 PCB Component Layout Drawing Fig 11 ...

Страница 31: ...4WF 4 Ω DC 25m A R13 Resistor 1 2WF 0 379 Ω DC 250m A R14 Resistor 1 2WF 18 Ω ΩX 1 R15 Resistor 1 4WF 200 Ω ΩX 10 R16 Resistor 1 4WF 34KΩ ΩX 1K R18 Resistor 1 4WF 240 Ω R19 Resistor 1 4WF 44KΩ R20 Resistor 1 4WF 195 KΩ ΩX10K R21 Resistor 1 4WF 18KΩ R22 Resistor 1 4WF 750 Ω R23 Resistor 1 4WF 31KΩ VR1 Variable Resistor 10KΩ D1 2 3 Diode 1N4448 C1 Ceramic Capacitor 0 047μF50V C2 Metal Film Capacitor...

Страница 32: ... 30 CIRCUIT DIAGRAM ...

Страница 33: ... 31 MEMO ...

Страница 34: ... 32 MEMO ...

Страница 35: ......

Страница 36: ...DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations 08 12 92 2025A ...

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