[Amps] LCR Meter

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Sun, 4 Apr 2010 04:29:34 -0700, "Jim Thomson" <Jim.thom at telus.net>
wrote:

>##  Both the  875A  and  875B     operate  at  1 khz  square wave.  What freq does the 
>AADE operate at ??     I rechecked my notes  from yrs ago... and don't know if the  choke
>was in the circuit or not.[ when measuring tune cap C.. after the fact].     I do know  that 
>when the mfj in rvs test was done... that I chassis grnded the cold end of the plate choke.
> IE: bypass capS  at base of plate choke was shorted out.
>
>## The notes say, that with choke removed... and mfj in rvs test was conducted, that everything
>resonated  just fine.  LCR meter  used to tap the coils initially.   When  plate choke was  added back
>into the circuit, the TUNE  C  had to be INCREASED  by 40 pf.  [160m only] ..and 10 pf on 80m. 

REPLY:

The AADE changes frequency automatically depending on the value being
measured, but I think the max is 100 kHz. If this is incorrect,
someone please correct me. 

The nifty part about doing this procedure is that when the RF choke
"eats" some C, it really doesn't matter as long as you have enough
spare C in the tune cap. When you re-connect the RF choke and re-tune
the tune cap, you end up with exactly the same net value of C anyway. 

73, Bill W6WRT