[Test-Equipment] Re: [Mw] Pacific Measurements Power Detector

[Donn Baker - WA2VOI/0]

Harry,

Here's the pinout for the HP 478/8478 thermistorheads.  I've used this for years to check heads at fleamarkets.  You 
should be able to find similar results with your new head if its good.  Good find, by the way.  I was looking for heads 
at Dayton.  Only found one... bad, with one of the thermistors reading about 4 ohms and the other an open... and there 
was a $100 tag on it.  What a dreamer !!

73 Donn
WA2VOI/0

Microwave Update '08
October 17-18, 2008
www.microwaveupdate.org



HP 478 Thermistor
Mount  Pinout

                 O 3

      O 2   O 6   O 4

      /  O 1    O 5
NOTCH

#2, 4, 6 - GND   #5 n.c.
#1 ~ 1k - 5k ohms to GND
#3 ~ 1k - 5k ohms to GND
 5% or better  balance!

ALSO for  HP8478B  (10 MHz - 18 GHz)

----- Original Message ----- 
From: "Harry Brown" <harryhbrown at earthlink.net>
To: "Test Equipment Reflector" <test-equipment at mailman.qth.net>
Sent: Monday, May 19, 2008 4:18 PM
Subject: [Mw] Pacific Measurements Power Detector


>I was wandering around the flea market at Dayton and found a HP 432 power meter with a power sensor and cable. The 
>power detector was not made by HP and looked different than clones I've seen. The cable didn't mate to the 432 but the 
>guy selling it said that I could get a correct mating connector and rewire it.
>
> The power sensor was a Pacific Measurements Model 13786 good from 1 MHz to 18 MHz.
>
> At the price asked I bought it.
>
> Some questions:
>
> Anyone know if the cable can be rewired to mate with an HP432 and work with the sensor?
>
> Any way to check if the sensor works using a simple ohmmeter test?
>
> Is the sensor more valuable to someone that has a real Pacific Measurements power meter and if so who needs one?
>
> If it works, what's it worth to a ham? (I did check a price via google and it was very high from test equipment 
> resellers).
>
> 73, Harry, W3IIT
>
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