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



   






In a message dated 30/11/2007 21:03:24 GMT Standard Time,=20
asensio@............ writes:
<=
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=3D2>With=20
  about 30 uApp the movement of the adjustment screw/rod is about 1 mm.
I=
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  think the response should still be linear at a 1 mm movement but
the ou=
tput=20
  voltage looks more like a triangle. Maybe I demand too much=20
....


Hi Andreas,
 
    I suggest treating your HS-10 with considerable=
=20
care. You might read through old letters by Sean Morrissey on psn. I remembe=
r=20
him replacing springs regularly. 
    Now you only want the sensor to move microns, s=
o I=20
suggest that you connect it to the input of a current to voltage=20
converter opamp and then use a 1/f amplifier stage to roll off the sign=
al.=20
This should give you a good idea of what performance you can expect. Going f=
rom=20
3 K to 400 Ohms will greatly overdamp it.  Later, you might use a negat=
ive=20
input impedance amplifier to give ~zero impedance, but you need to provide a=
=20
temperature compensated reference resistor. This could be as simple as a Ni=20
thermometer element and a resistor, or a non inductively wound coil of coppe=
r=20
wire - if you can get it thin enough. Pt has a slightly lower temperatu=
re=20
coefficient. 0 to 100 C  for Cu =3D 1.44, Pt =3D 1.32, Ni =3D 1.70=
..
    Could you send an EMail to the manufacturer? Th=
ey=20
should be able to advise you.
 
    Regards,
 
    Chris Chapman