10
KCS-ID Manual
Klippel R&D System
1.8
Troubleshooting
1.8.1
KCS-ID messages
Amplifier Headroom exceeded
The KA3’s amplifier can provide approx. 19…22 V peak (depending connected DC resistance). The
error message pops up if more voltage is required to reach a certain limit or the excitation voltage is
set manually to a level exceeding the amplifier’s capability. Note that the multi-tone stimulus has a
crest factor of approx. 3. Hence, the maximum possible voltage is 6…7 V RMS when the internal AMP
card is used.
You can use an external amplifier that can provide more voltage to drive the transducer to its limits
or to reach a higher excitation voltage.
If 6…7 V RMS are sufficient because the target amplifier used in the KCS online mode cannot deliver
more voltage anyway, you can set the level manually to approx. 6 V RMS in the KCS-ID’s property
page’s category
Stimulus.
High voice coil position change detected
This message indicates that between LINEAR MODE and NONLINEAR MODE either
the voice coil was shifted significantly due to very asymmetric nonlinear behavior of the
transducer or
the distance between laser sensor and transducer membrane position has changed
Note that the rest position of the NONLINEAR MODE is used as reference rest position used in the
KCS on-line mode. The voice coil stabilization feature will shift the voice coil to this reference rest
position.
Check correct Speaker System Type setting
KCS-ID performs a small signal speaker parameter identification in the LINEAR MODE. If it detects
that e.g. the number of distinct impedance magnitude peaks does not correspond to the specified
Speaker System Type (e.g. sealed or vented enclosure), this message appears. Note that in rare
cases, the warning might trigger even if the correct speaker type is set. In this case you do not have
to do anything.
1.8.2
KCS Server messages
The KCS Server website might display warnings and information after a KCS-ID file has been
uploaded. See explanations of selected info and error messages below.
Info/Warning Messages
Low both-sided Bl(x) decay. Detection of the voice coil rest position and stabilization might not
work optimally.
