05 | Keysight | M9260A PXIe Audio Analyzer Module – Data Sheet
Loopback and multiple impedance selection
The M9260A PXIe audio analyzer module includes built-in features that aim to provide
you with greater convenience and confidence in your audio measurement tasks. Figure 2
illustrates the loopback and multiple impedance selection within the M9260A.
Loopback: The M9260A module has a loopback from the generator to the analyzer. This
enables an automatic self-test and self-calibration of the audio analyzer module. This
avoids the need for manual calibration via an external BNC cable, which could inevitably
introduce errors due to the external connector or cable. For automated test systems, the
loopback is a critical feature as manual calibration via an external BNC cable is not an
allowed procedure.
Multiple impedance selection: Unmatched impedances can create errors in test, which is
why it is necessary to ensure exact impedance matches to the DUT. Typical digitizers do
not provide a selection of impedances – usually only one – hence you often need to use
external impedance converters to achieve the required impedance. The M9260A output
impedance selection includes the 50 Ω impedance that’s commonly used for audio devices,
and 600 Ω impedance to match legacy audio devices. The M9260A input impedance in-
cludes three selections: 50 Ω, 600 Ω, and 1 MΩ to match the output of most audio devices.
In addition to this selection, the Keysight U8903A-109 BNC accessory kit is available if you
need to convert the M9260A impedance to any other required value.
Output impedance
50Ω
600Ω
M9260A
Loopback
Generator
Input impedance
1MΩ
Analyzer
50Ω
600Ω
Figure 2. M9260A PXIe audio analyzer loopback and multiple impedance selection features
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