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Thanks. My sensor end of the cable is passive, so, other than adding a circuit at the remote location (which is not totally out of the question), I have no way of creating true differential signals. If it is changing cable capacitance as you suggest, then what would the solution be?
Well, I'm trying to reduce coupling between cables that are running adjacent to one another. I am already using twisted pair but still have problems. My drive signal is running adjacent to pickup signals for 70 ft. Pickup signals are very small and I believe my problem is coupling as I am...
Hi,
Does anyone have any experience using the magnetic shielded wire products from Magnetic Shield Corp? Here is a link to their website....
https://www.magnetic-shield.com/index.html
Can anyone comment on the effectiveness (or lack thereof) of these products at audio frequencies? It all...
Thanks for all the replies. After digesting these thoughts and other discussions, I am wondering if what I actually need is a magnetic shield material as I am operating at such a low frequency (10 kHz)? Any comments? I did try the transformer coupling approach and it did not seem to help much...
Hi, I am driving a coil at 10 kHz with a constant current source. There are two detector coils mounted axi-symmetrically positioned either side of the primary. All three coils have a resistance of 3 Ohms and inductance of about 275 uH (Figure 1). I am currently using foil shielded twisted...
Well, it is all part of a very large continuous caster - pretty much everything is steel, it's all connected together and ultimately all grounded. How good that ground is, I don't know for sure.
Hi,
I have some instrumentation on very large piece of industrial machinery. The instrumentation drives a coil at 10 kHz A.C. and looks at the resulting induced emf in two secondary coils. The instrument connects to the coil via a 20m cable, a junction box then connects this cable to a...
CAL1 and CAL2 are DC signals forming the second inputs to the two instrumentation amplifiers (INA111) so I think I am using them correctly, or am I missing something? Thanks.
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The circuit oscillates VERY occasionally - for example, sometimes it is days before I see an...
Here is the circuit. Power supply pins are decoupled using a 4.7uF Tantalum in parallel with a 0.01uF ceramic capacitor. This is basically a detector circuit operating at 10 kHz. The two instrumentation amplifiers provide high- and low-sensitivity outputs. Thanks!
<a...
Hi,
I am trying to get to the bottom of a rather stubborn circuit instability and want to rule out a few things. I am driving two instrumentation amplifiers (INA111's) - either both + inputs or both - inputs, never mixed - from a common source. The source is basically a passive low-pass...
Well, this is a follow-up post following a question about the INA111. Really, I don't need an actual answer to this question, more advice on the best place to go to help me. So, I am looking for a zero-drift instrumentation amplifier that I can operate at 10 kHz with a gain of at least 100...
Would that affect ac performance? I am monitoring the signal after a bandpass filter and so assumed that offset drift was not a contributor - maybe I am wrong about this?
Also, thanks for the hint on freezer spray - makes perfect sense now you told me!
Thanks!
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I'm using...
Now I'm thinking it might be drift in CMRR with temperature. I use the same IC in a different part of the circuit with just as much gain and it does not drift at all. The difference being that this second circuit is configures as a single-ended input, i.e. the other input to the INA111 is...
So, put a thermsitor from the output to the inverting input of the instrumentation amplifier? With a temperature coefficient equal to what I observe? Will it affect the gain? How would I select a value and would this work for all gains or would it need to change if I altered the gain-setting...
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