TESTING ELECTRONIC COMPONENTS WITH MEASURING TOOLS & REPAIR ( 1 )

Measuring Elco With Multimeter

Actually the way that I have to say this does not quite fit for a check elco, and precise way to measure who is the capacitance METER elco, and he will show the actual capacity of which is owned elco's. But it is quite enough to help, here's how:

1. Turn the measuring limit of the ohmmeter X1 / X10 for elco large size and X100 / X1K to elco small size.
2. Connect the probe to each foot ELCO (same sided)
3. See the appointment of a needle on the scale board.

Conclusions The results of measurements
• Needle point & figure back into place: good elco
• The needle pointed to the numbers and did not return to the same place: leaking elco
• The needle does not move at all: elco break
• The needle at zero: elco short

Measuring the Non Polar Capacitor With Multitester

Actually, this method is also not right to check the capacitors, and precise way to measure who is the capacitance METER elco, and he would show who the actual capacity that is owned elco. But it is quite enough to help, here's how:

1. Turn the measuring limit of the ohmmeter X1K / X10K
2. Connect the probe to each leg of the capacitor (same sided)
3. See the appointment of a needle on the scale board.

 

Conclusions The results of measurements

• The needle pointed to the numbers then and to the same place: a good capacitor
• The needle pointing to the ill back into place: a capacitor leak
• The needle does not move: the capacitors break
• The needle pointed to zero: the capacitor short

3. DIODE

Diodes are electronic components made ​​from semiconductor elements. This material is silicon or germanium. Silicon diodes working on the voltage 0.6 VDC and germanium diodes working on the voltage 0.2 VDC.

Examples of diodes: IN 4148, IN4002, IN 4003, etc..

 

Diode symbol is D, the symbol image:

 

Diode properties:

• If given the forward direction (positive voltage => anode and negative voltage => cathode) will deliver the flow and vice versa

 

• If given the backward direction (positive voltage => cathode and a negative voltage => anode) will not conduct current.

 

Diode function:

• As a rectifier
• As a safety circuit of the possibility of polarity reversal

Measuring Diodes With Multitester

Turn the measuring limit of the ohmmeter X10 / X100

 

1. red probe => cathode, black probe => anode => The needle moves is not zero.
then the position is reversed:
red probe => anode, black probe => cathode, Needles ill move
means diodes in GOOD condition.


2. red probe => cathode, black probe => anode => The needle moving or pointing to zero.
then the position is reversed:
red probe => anode, black probe => cathode => The needle moving or pointing to zero
means the diode under conditions DAMAGED / SHORT.


4. DIODE ZENER

Made of silicone material. Typically used in power supply circuit where the current function is as a stabilizer. Although the AC current is converted to DC subject to change, will not take effect if there is a zener diode.

The nature is as follows:

• Voltage achieved an average maximum of 0.7 s / d 12 volt
• Only a small resistance to flow, a maximum of 1 s / d 50 mA
• Virtually no voltage is lost if it passes a zener diode.

Zener diode example: zener 6 volt, 12 volt zener, etc.     

 

 

Measurement of whether or not the same zener diode with a regular measurement.
Applications in circuit