PSN-L Email List Message
Subject: Re: HS-10-1 questions
From: "Geoff" gmvoeth@...........
Date: Fri, 30 Nov 2007 22:49:27 -0700
If you purchased the HS10 new ($2500 USD) then the MFG
is the right place to go but if you
got it used ($250USD)they want nothing to do with you.
----- Original Message -----
From:
To:
Sent: Friday, November 30, 2007 3:10 PM
Subject: Re: HS-10-1 questions
>
> In a message dated 30/11/2007 21:03:24 GMT Standard Time,
> asensio@............ writes:
>
> With about 30 uApp the movement of the adjustment screw/rod is about 1 mm.
> I think the response should still be linear at a 1 mm movement but
> the output voltage looks more like a triangle. Maybe I demand too much ...
>
>
>
> Hi Andreas,
>
> I suggest treating your HS-10 with considerable care. You might read
> through old letters by Sean Morrissey on psn. I remember him replacing springs
> regularly.
> Now you only want the sensor to move microns, so I suggest that you
> connect it to the input of a current to voltage converter opamp and then use a
> 1/f amplifier stage to roll off the signal. This should give you a good idea of
> what performance you can expect. Going from 3 K to 400 Ohms will greatly
> overdamp it. Later, you might use a negative input impedance amplifier to give
> ~zero impedance, but you need to provide a temperature compensated reference
> resistor. This could be as simple as a Ni thermometer element and a resistor,
> or a non inductively wound coil of copper wire - if you can get it thin
> enough. Pt has a slightly lower temperature coefficient. 0 to 100 C for Cu =
> 1.44, Pt = 1.32, Ni = 1.70.
> Could you send an EMail to the manufacturer? They should be able to
> advise you.
>
> Regards,
>
> Chris Chapman
>
>
>
>
>
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