>>though, as the user might change from 3.9V to 4.0 by changing
>>the MSD first and blow a chip up..
>
>We use a lot of the HP662x PSU's here, they have direct keypad
>entry of the voltage and current limits.  I hate them with a
>vengance.  Setting 3.3 volts, you have to be ultra-carefull
>that the decimal point was accepted, or things with tantalum
>caps tend to explode quite violently.  So I heard anyway... :o)
>
>I definitely think PSU's are one application where a rotary control
>and an analog meter (especialy for current) are hard to beat.

I have used a number of Thurlby Thandar 3510 PSu's, and these have both
keypad and rotary entry. I find the keypad real nice with well spaced keys.
Haven't had problems with decimal point entry, but perhaps that is because
they tend to be used to simulate spacecraft 28V supplies :) The rotary knob
is ideal for tweaking the supply up and down, but I would not want to use it
to get to the other end of the voltage range from where I am.

But the other nice thing is that they have an output on/off button, which
means that you can set the voltage and current limits before turning on the
output. The item being set is displayed in a separate smaller display, which
is then used to show watts when the output is turned on. Real handy feature.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body