Re: B&K Precision Power Supply

Hello John,


We bought a B&K 1788 programmable power supply, that claims to be
0-32V/0-6A. When we tried to use it, we were never able to get more
than a couple of amps out of it, under any load. When we tried to run a
DC motor on it, it settled on a current of about 1/2 A, at about 1V,
not enough even to turn the shaft. Putting a 3ohm resistor across it,
programming for 10V and 3A, we should have gotten a constant current of
3A at a voltage of 9V, but got 2.46V at 0.81A. With a 9.1ohm load,
setting voltage for 24V and current for 3A, we got 11.68V at 1.31A.

Finally, while running the motor with a 3ohm resistor in series, it
ran at 24V and 1.49A with the shaft free-running. Putting a finger load
on the shaft, the current increased to 2.5A, and then a relay in the
unit clicked and the voltage dropped back to 15V. Around then, it
started emitting epoxy-smelling smoke.

Although the unit is spec'ed at 32V, it can't even be programmed to
that- anything higher than 31V gets trimmed to 31 on the display.

Has anyone here used this supply, and found it not to be a piece of
***? I'd like to know if we should return it for warranty repair or
try to get our money back.


Epoxy-smelling smoke? My advice: Return it, asap.

--
Regards, Joerg

http://www.analogconsultants.com
.

Quantcast