HBM Genesis series Technical Note page 20

GN610, GN611 Isolation and type testing
Figure 6.2: Automatic thermal overload response
Automatic restore of user selected range
As the GEN series system is designed to measure 24 hours per day, 7 days
per week, the automatic ranges switching has the negative side effect of
reduced sensitivity of the amplifier. During the actual overload condition the
channel will not be able to measure the input signal anyhow, so no extra
negative side effects are introduced. If the overload condition disappears and
the system is running unattended, the automatic selected input range will not
be the best measurement range. Therefore the amplifier will remember the
original selected user range and restore this user selection as soon as regular
thermal conditions are restored. Temporary large overload conditions will then
only result in temporary adjusted input sensitivity.
It is expected that the thermal conditions might only be restored because of the
automatic range adaption of the input channel. So the actual overload condition
might not have disappeared yet. If this would be the case, the thermal increase
would re-trigger the automatic range adaption process and the overload is
handled exactly the same way as before.
20 HBM public