TABLE OF CONTENTS Resistance
where
| ? | = resistance |
| V | = voltage |
| AT | = ampere turns |
| T | = turns |
Ampere Turns
Amperes
where
A = amperes
Direct Current
The Universal (Arytron) Shunt
For 0 to 10 mA, use:
where
| R sh1 | = 0.111 ohm shunt |
| R sh2 | = 1.11 ohm shunt |
| R sh3 | = 11.1 ohm shunt |
| R m | = 100 |
For 10.01 to 100 mA, use:
For 100.01 mA to 1 amp, use:
Determining Required Shunt Resistance
where
| R sh | = shunt resistor |
| I m | = full-scale deflection current |
| R m | = dc resistance of meter |
| I sh | = current to be shunted |
dc Voltmeters
Determining the Total Resistance Required to Drop Full-scale Voltage at fsd Current
where
| R t | = required resistance drop |
| M r | = desired meter range |
| I m | = full-scale deflection current |
| I m | = dc resistance of meter |
Meter Sensitivity
where
| M s | = meter sensitivity |
| V | = volts |
| I m | = full-scale deflection current |
Series Voltmeters
Determining the Value of a Multiple Resistor
where
| R v | = multiple resistor value |
| V | = full-scale voltage for desired range |
| I m | = full-scale deflection current |
| R m | = meter resistance |
dc Bridges
Balance for a Wheatstone Bridge
where
| R x | = unknown resistance |
| R a and R b | = ratio arms |
| R s | = variable standard resistance |
when
Alternating Current Waveforms
| Factors Used for Sinusoidal Wave Shape | ||||
|---|---|---|---|---|
| Given | Average | r.m.s | Peak | Peak to Peak |
| Average | 1.0 | 1.11 [**] |
