In a message dated 10/03/2005, ke6pxp@....... writes:

I am  building a mercury-cup tiltmeter and it uses the INA121 opamp. I would
be  interested in seeing your analysis of it's noise  also.



Hi George,
 
    I don't know if you could tolerate an input current  of 5 nano Amps, 
rather than 4 pico Amps? The INA118 has about  1/3 the 0.1 to 10 Hz voltage noise 
and about twice the CMRR range. This is the  one that I use with differential 
photocells. 
 
    Regards,
 
    Chris Chapman






In a message dated 10/03/2005, ke6pxp@....... writes:
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=3D2>I am=20
  building a mercury-cup tiltmeter and it uses the INA121 opamp. I would
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  interested in seeing your analysis of it's noise=20
also.


Hi George,
 
    I don't know if you could tolerate an input cur=
rent=20
of 5 nano Amps, rather than 4 pico Amps? The INA118 has abo=
ut=20
1/3 the 0.1 to 10 Hz voltage noise and about twice the CMRR range. This is t=
he=20
one that I use with differential photocells. 
 
    Regards,
 
    Chris Chapman