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Low Source Impedance on Keysight 8920 Audio Output

The 8920 Family of instruments have a very low source impedance (< 1 ohm) for the audio generator so that a voltage level set by the audio generator is almost entirely delivered to the load under test (DUT, Device Under Test). For example, when the 8920 is set to a level of 259 mV having a 1 ohm source impedance applied to a 600 ohm load, 258.6 mV are actually applied:

Voltage applied = Voltage set

V applied = 259 mV (600/600+1)

V applied = 259 mV (0.9983)

V applied = 258.6 mV

Whereas if the 8920 had a 600 ohm output impedance then the set voltage would not reflect the actual applied voltage:

Voltage applied DOES NOT = Voltage set

V applied = 259 mV (600/600+600)

V applied = 259 mV (0.50)

V applied = 129.5 mV

(c) Copyright Agilent Technologies 1998, 2000

This information is subject to change without notice and is provided "as is" with no warranty. Agilent Technologies shall not be liable for any direct, indirect, special, incidental or consequential damages in connection with the use of this material.