Protek 2700 Power Meter

[joeqsmith]

I bought this meter new and it started acting up.  Never was a real great meter but good for a ballpark with low frequencies.   This is the first time I have had it apart.

[joeqsmith]

Can is made from two parts.  One brass. Soldered together.   The two circuit boards are also soldered together. 

[joeqsmith]

The meter became very unstable.  It has not been abused.  When I removed the can, there is some crazy rework in there.  Once apart, the thing started working.  Spent a fair amount of time trying to find a cracked joint in this mess. 

[joeqsmith]

Really, not that bad for low frequency.  They claim +/-10% of full scale from 10MHz to 1GHz.   Full scale ranges are 2W, 200mW, 20mW and 2mW.

Shown with 10,1 and -1dBm. 

[joeqsmith]

Shown with 2G, 10dBm.  Not so great.  There are 4 pots to align it but I doubt there is anything to trim it for flatness.  I suspect that's what the crazy pile of soldered together mess was for.