HP3070
Teradyne / Genrad 228x
Mentor Graphics
(formerly)
Router Solutions Incorperated
* 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.
Ohm's Law
Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance.
| E = I x R | I = E / R | R = E / I |
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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
| 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.
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Voltage Divider Formula
The formula for determining the DC or AC output voltage of a resistive divider is:
Vout = Vin * R2 / (R1 + R2)
Convert Units of measurement
Convert Temperature from Fahrenheit to Celsius to Kelvin
The following is a good link with a lot of useful conversion tools:
http://www.export911.com/convert/conFac-I.htm