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@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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