caius
Guest
Fri Jan 21, 2011 7:07 pm
Hi all,
I have to made some measurements with a frequency counter (model VC3165) on
low frequencies (up to 60 Hz) .I know that in case of low frequency
measurements a low-pass filter is needed in order to obtain stable and
precise readings.
My frequency counter has only an AC/DC button (to be used with a low-pass
filter as said in the service manual) but it doesn't have an integrated
low-pass filter (many counters have it).
I built some simple RC filter ( using a resisitor and a capacitor) with
various cut-off frequncy ( I tried 15 Khz and 50 Khz) but I alway obtain
floating and not precise readings on low frequencies.
How can I solve this problem?Maybe using a low-pass filter like these(very
expensive IMHO)?:
http://cgi.ebay.com/AGILENT-HP-10856A-LOW-PASS-FILTER-KIT-5KHz-50KHz-500KHz-/120668081898?pt=LH_DefaultDomain_0&hash=item1c1860ceea
or building a proper one (but as said before simple RC filters didn't work)?
JeffM
Guest
Sat Jan 22, 2011 9:23 pm
caius wrote:
Quote:
[...]How can I solve this problem?[...]
Step 1:
Post it in a way that *everyone* who reads the question
can see **ALL** of the responses.
The way you do that is to put the names of
ALL the groups to which you are going to post it
on the To: line of your *first* (and only) post;
separate those with commas.
This is called cross-posting.
An even better method
is to choose ONE group where your topic is appropriate
and post ONLY to that group.
