30 Multimeter use how to test electronic device with a multimeter
How to check electronic device and how to test electronic components. Testing electronic components with analog multimeter and digital multimeter.
Friday, November 3, 2023
Color Code of resistor 1 Ohm 2 Ohm 10 Ohm 100 Ohm 2K 5K 10K and 100K
Monday, March 20, 2023
Multimeter use how to test IGBT and testing electronic components with multimeter
Multimeter use how to test IGBT using Analog Multimeter and Digital Multimeter
IGBT TESTING IGBT has 3 legs , namely , Gate , collector and Emitter , Its working principle is input voltage control output current. we can use this basic bias to test whether it is a bad or good IGBT. Important note analog Multimeter use on this article it is a version that black test lead supply V+ and red test lead supply V- , when setting to resistance test function.![]() |
HOW TO TEST IGBT |
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Connection diagram to test IGBT ON / OFF testing. |
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Sample IGBT has Gate Collector and Emitter ( pin No. 1 2 3 respectively ) |
Step to test IGBT ON / OFF TESTING
1. Take IGBT part number to find leg function from datasheet.
2. Connect test leads with IGBT leg as photo above.
3. Set analog multimeter to Rx10K as this range it will supply 9VDC from internal battery. 9VDC is high enough to bias gate leg so IGBT is working as ON state.
4. Use resistor's leg to temporarily connect between G leg and C leg ; the pointer's of multimeter move forward to low resistance as shown on photo.
5. After removing resistor leg the pointer 's of multimeter hold
the same position because IGBT is still working as ON state , this is for a good IGBT indication but the bad IGBT can not hold ON state so the multimeter's pointer move backward to ∞ position after removing resistor's leg.
Friday, March 10, 2023
Test SCR / THYRISTOR MODULE with multimeter
How to test SCR Module
3. Check SCR condition , A and K1 terminal. Set to Ohm meter range , good SCR will display very high resistance as Mega Ohm. Shorted SCR , multimeter display 0 Ohm and Open SCR , multimeter display OL.
Check A and K1 terminal of SCR , good SCR get very high resistance Mega Ohm.
4. Check SCR condition , G1 and K1 terminal. Set to Ohm range on digital multimeter , good SCR will display low resistance . Shorted SCR , multimeter display 0 Ohm and Open SCR , multimeter display OL.
Check G1 and K1 terminal. , good SCR will display low resistance .
Analog multimeter can check diode on SCR module too if it is a good diode will point at low resistance when forward biasing and point at ∞ (Infinity) Ohm when reverse biasing. Check G1 and K1 terminal of SCR module , good SCR will display low resistance so it can check by Rx1 Ohm Range. However , A and K1 terminal of SCR is 4-5 Mega Ohm resistance analog multimeter can not display or present any pointer movement this is very high value , after try with the same module and same condition , it always point at point at ∞ (Infinity) Ohm.
Sunday, March 5, 2023
10 Ohm 100 Ohm 220 Ohm 1K 10K 100K colour Code resistor with value label
Resistor color code and its reading example set 3
Read resistor color code from real resistor.
These are photo of resistor with label to present 10 Ohm 100 Ohm 220 Ohm 1K 10K 100K colour code resistor and more. For rechecking and confirm value of resistor. Many time we have question about lavue of resistor and we use a few method to find the resistor value such as test it by multimeter , seek manual and label on PCB , and compare color code with the good one.
Example of 4 bands resistor color code
1) 10 ohm resistor color code 0.5W ±5%
Brown black black gold
1 0 x1 ±5% = 10 Ohm ±5%
2) 100 ohm resistor color code 0.5W ±5%
Brown black brown gold
1 0 x10 ±5% = 100 Ohm ±5%
3) 220 ohm resistor color code 0.5W ±5%
Red red brown gold
2 2 x10 ±5% = 220 Ohm ±5%
4) 1K ohm resistor color code 0.5W ±5%
Brown black red gold
1 0 x100 ±5% = 1000 Ohm ±5% = 1K Ohm ±5%
5) 10K ohm resistor color code 0.5W ±5%
Brown black orange gold
1 0 x1000 ±5% = 10000 Ohm ±5% = 10K Ohm ±5%
6) 100K ohm resistor color code 0.5W ±5%
Brown black Yellow gold
1 0 x10000 ±5% = 100000 Ohm ±5% = 100K Ohm ±5%
7) 1M ohm resistor color code 0.5W ±5%
Brown black green gold
1 0 x100000 ±5% = 1000000 Ohm ±5% = 1M Ohm ±5%
8) 2.2K ohm resistor color code 0.5W ±5%
Red red red gold
2 2 x100 ±5% = 2200 Ohm ±5% = 2.2K Ohm ±5%
9) 4.7K ohm resistor color code 0.5W ±5%
Yellow violet red gold
4 7 x100 ±5% = 4700 Ohm ±5% = 4.7K Ohm ±5%
10) 6.8K ohm resistor color code 0.5W ±5%
Blue grey red gold
6 8 x100 ±5% = 6800 Ohm ±5% = 6.8K Ohm ±5%
11) 22K ohm resistor color code 0.5W ±5%
Red red orange gold
2 2 x1000 ±5% = 22000 Ohm ±5% = 22K Ohm ±5%
12) 47K ohm resistor color code 0.5W ±5%
Yellow violet orange gold
4 7 x1000 ±5% = 47000 Ohm ±5% = 47K Ohm ±5%
13) 68K ohm resistor color code 0.5W ±5%
Blue grey orange gold
6 8 x1000 ±5% = 68000 Ohm ±5% = 68K Ohm ±5%
14) 220K ohm resistor color code 0.5W ±5%
Red red yelllow gold
2 2 x10000 ±5% = 220000 Ohm ±5% = 220K Ohm ±5%
15) 470K ohm resistor color code 0.5W ±5%
Yellow violet yelllow gold
4 7 x10000 ±5% = 470000 Ohm ±5% = 470K Ohm ±5%
16) 680K ohm resistor color code 0.5W ±5%
Blue grey yelllow gold
6 8 x10000 ±5% = 680000 Ohm ±5% = 680K Ohm ±5%
17) 470 ohm resistor color code 0.5W ±5%
Yellow violet brown gold
4 7 x10 ±5% = 470 Ohm ±5%
18) 680 ohm resistor color code 0.5W ±5%
Blue grey brown gold
6 8 x10 ±5% = 680 Ohm ±5%
Wednesday, March 1, 2023
Test IGBT with Multimeter BAD or Good Condition
Test IGBT with Multimeter
How to test IGBT with multimeter , it will explain on this article. If anyone can use a basic multimeter and know how to test diode , it can easily test IGBT too. Before testing notice the IGBT terminals , It has G , C and E terminal. G = Gate , C= Collector, E = Emitter. Some model of IGBT has internal diode connected across C and E terminal. Hight current and big IGBT tend to fail as shorted and open condition so before testing all process you may firstly check shorted and open condition.
Discharge IGBT by shorting 3 terminal together. This sample IGBT has terminal arrangement as G C E ( 1-2-3 respectively ).
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Step to Test IGBT with a multimeter .
1. Discharge IGBT by shorting 3 terminal together. Use resistor legs or other similar metal wire. After discharge do not touch any its terminal and during the test process always hold at insulated area or black case. Remove IGBT from circuit before doing any any testing.
2. Test C and E terminals by using Rx1K Ohm range. Touch the test lead and read the measured value. Switch the test lead and read the measured value again. Good IGBT will display some resistance 1 time and ∞ 1 time. Shored IGBT will point at 0 Ohm 2 time. Open IGBT will point at ∞ 2 time.
Good IGBT will point at ∞ scale 1 time
3. Test G and C terminals by using Rx10K Ohm range. Touch the test lead and read the measured value. Switch the test lead and read the measured value again. Good IGBT will display ∞ 2 time.
4. Test G and E terminals by using Rx10K Ohm range. Touch the test lead and read the measured value. Switch the test lead and read the measured value again. Good IGBT will display ∞ 2 time.
Test G and C terminals by using Rx10K Ohm range.
Test G and E terminals by using Rx10K Ohm range.
All step 1 , 2 , 3 to 4 testing must be good condition so the IGBT is good condition. If any of only 1 step is fail so the IGBT is already bad.
Simple method to test IGBT is Gate trig.
Discharge the IGBT by shorting 3 terminal together. During the test process do not touch any terminal and always hold IGBT at black case. Connect the lest lead as photo then use resistor to supply trig voltage from C terminal to trig G terminal. Good IGBT will cause pointer of multimeter move forward and point at some resistance. then remove the resistor ( trig voltage) , the IGBT still let current flow and the pointer still point at the same position when trig Gate.
After removing trig voltage , the pointer still point the same position ( for good IGBT)
Friday, January 20, 2023
How to test a transistor good or bad condition with hFE test
Test a transistor good or bad , hFE test
Condition of transistor : good , bad or defective can be checked from its hFE. hFE is DC amplification and it is a the relation of Ib and Ic , hFE = Ic/Ib. Generally , hFE is amount range 10-1000 it depends on a transistor part number. Shorted , opened , defective transistor will reflect to hFE amount. We will demonstrate those case below. hFE amount also use to QC quality of transistor , compare quality of transistor from different supplier or different batch. Some model of analog multimeter and digital multimeter has specific transistor test socket.
Transistor test socket
Step to check a transistor hFE.
1. Find a transistor terminal arrangement and DC current gain from its datasheet. For example transistor part number :
2N3904 is NPN type , terminal arrangement : E-B-C and hFE = 100(min)-300(max) .
2N3906 is PNP type , terminal arrangement : E-B-C and hFE = 100(min)-300(max).
2. Insert the right terminal to the right socket and transistor type. B terminal to B socket , C terminal to C socket and E terminal to E socket.
hFE test of 2N3906 PNP transistor , good transistor will display hFE
3. In case of bad transistor : shorted , opened will display as demonstration below.
C-E shored demonstration , bad transistor
Open E terminal demonstration , bad transistor
How to check electronic device
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