B&K Precision 1688B - Manual - Manual (Page 34)

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Figure 14 - Overtemperature Protection
When you get this warning, switch off the unit and remove all loading. Check your
load and output settings and allow the unit to cool down for at least 30 minutes.
Check if any of the ventilation is blocked and make sure there is enough clearance
around the power supply. Listen carefully for the fan noise from the cooling fan when
you turn on the unit again. If you cannot hear this routine self test fan noise upon
power on, the fan has failed and the power supply should not be used. In this case,
please contact B&K Precision.
6.3 OLP: Overload Protection
Normally the overload protection is sustained by the CC constant current mode.
When the CC mode fails and goes undetected, it may cause serious damage to your
device under test. The OLP is to minimize the extent of damage to your loads as
power supplies will fail at some point in time. Switch off your power supply as soon
as you see this warning as shown in Figure 15.