* CIRCUIT BOARD TEST RESOURCES *

Here you will find various resources that can help you with your everyday test needs. Handy when you're out of the office you have an online place to look for answers or find links to your questions.

HP3070

 

Teradyne

 

Mentor Graphics

(formerly)
Router Solutions Incorperated

Ohm's Law

Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance.

Ohm's Law

E = I x R	I = E / R	R = E / I

Resistor Color Code

Resistor Color Code

Black	Brown	Red	Orange	Yellow	Green	Blue	Violet	Grey	White
0	1	2	3	4	5	6	7	8	9

Capacitor Codes

Capacitor Codes

3rd digit	0	1	2	3	4	5	8	9
Miltiplier	1	10	100	1,000	10,000	100,000	.01	.1

A capacitor marked 104 is 10 with 4 more zeros or 100,000pF which is otherwise referred to as a .1 uF capacitor.

Parallel Resistors

To find the equivilent or total resistance of two unequal parallel resistors is to use the Product Over Sum formula.

To find the equivilent or total resistance of unequal parallel resistors is to use the Reciprocal formula.

or

 

Voltage Divider Formula

The formula for determining the DC or AC output voltage of a resistive divider is:

Vout = Vin * R2 / (R1 + R2)

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