Table of Contents
Advertisement
Chapter 8 Tutorial
Actuators and General-Purpose Switching
Using Attenuators
Provisions have been made on the HP 34903A circuit board for
installing simple attenuators or filter networks. An attenuator is
composed of two resistors that act as a voltage divider. A typical
attenuator circuit is shown below.
V
att
To select the attenuator components, use the following equation:
R
2
V
= V
x
att
signal
R
R
1
One typical use for the shunt component is with 4 to 20 mA transducers.
A 50 , 1%, 0.5 watt resistor can be installed in the R2 location.
The resultant voltage drop (transducer current through the resistor)
can be measured by the internal DMM . Thus, the 50 resistor converts
the 4 to 20 mA current to a 0.2 to 1 volt signal.
R1
HI
LO
R2
2
V
signal
8
387
Advertisement
Table of Contents
