Keysight 34972A - Using Attenuators

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324 Keysight 34970A/34972A User’s Guide
Using Attenuators
Provisions have been made on the 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.
To select the attenuator components, use the following equation:
One typical use for the shunt component is with 4 to 20 mA transducers. A 50Ω,
±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 50Ω resistor converts the 4 to 20 mA current to a 0.2 to 1 volt
signal.
R1
R2
V
signal
V
att
HI
LO
V
att
V
signal
R
2
R
1
R
2
+
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×=