Hi Keith,
I have made a lot of them working for a German Oscilloscope
manufacturer.
You can use alsmost any of the available BNC-M to BNC-F enclosures,
and then you install a 1M resistor and parallel to that a 12 pF cap,
also parallel a 20 pF (max) C trimmer. So now the normalizer is
"tuned" to the input capacitance at 1 kHz for best square signal in
the att setting that will pass thru directly. Then, adjust the 1:2,
1:5, 1:10, 1:100 and 1:1000 attenuators using the normalizer.
Newer scopes have a c trimmer for adjusting the input capacitance,
for these the normalizer must be externally adjusted to a fixed
value, including the one BNC connector.
Was that of help?
Jochen DH6FAZ
Am 29.09.2012 20:49, schrieb
keithostertag:
toggle quoted message
Show quoted text
?
Jerry-
Maybe you would be willing (or someone else?) to share
your schematic for the normalizer? And any tips for making
them?
Thanks,
Keith Ostertag
--- In TekScopes@...,
jerry massengale wrote:
>
> Hi,
>
> the problem with using a probe to adjust the input is
that your probe may be way off. Unless you are sure of the
probe, it is best to use a known device which a normalizer
is made. If you get a probe that was adjusted to use with
a 7A22(47pf) you could be the blind leading the blind.
LeCroy 9400s and SC502s use 47pf inputs also.
>
>
>
>
>
> Jerry Massengale
>
>
>
>
>
>
> -----Original Message-----
> From: HankC
> To: TekScopes <TekScopes@...>
> Sent: Sat, Sep 29, 2012 12:32 pm
> Subject: [TekScopes] Re: Normalizer calibration
>
>
>
>
>
>
> The purpose of a normalizer is to ensure that the
input C of the plugin is "normal" so it is within range of
the compensation adjust of the probes likely to be used
with it.
> In the end, it really doesn't matter if it's 19, 20,
or 21 pf input.
> You could use an existing probe as a normalizer as
long as you don't move its adjustment.
> Then, adjust the C-in of your other scopes for a good
sq wave with this probe.
> Use the most sensitive V/div but make sure no preamp
gets switched in at the more sensitive ranges.
> Once done, adjust your other probes to the scope
they're being used on.
>
> HankC, Boston
>
