Oh, and if you are driving an inductive load like a relay coil, motor, or I suppose an incandescent bulb or a speaker, don't forget the flyback diode to protect the driving transistor.? A fast recovery diode, reverse biased in normal operation, will shunt the inductive flyback kick around the transistor.? ? Jim
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-------- Original message --------
From: Dave Wright <davewrightsplace@...>
Date: 2/15/22 8:36 AM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8595E Restore and Tracking Generator Questions
Jim,
HP uses a mechanically latched relay in the 8593E and others. But, the drive circuit is not an impulse type. The current is continuous, and leads to excess dissipation in the coils.
Details here:?
/g/HP-Agilent-Keysight-equipment/topic/31717125#96700_Dave KC6UPS
