[Amps] LCR Meter

[Larry Benko]

Jack, K8ZOA wrote a very in depth review of the AADE L/C IIB recently.  
The link was published here a few days ago but here it is again 
http://www.cliftonlaboratories.com/aade_l_c_iib_meter_review.htm and in 
the 3rd paragraph is a button to download a pdf file of the review.  
Page 13 of the review has a detailed graph of test frequency vs 
capacitance or inductance.  The highest test freq. is about 750KHz and 
the lowest is about 10KHz.

Larry Benko,. W0QE

Bill, W6WRT wrote:
> 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
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