Hey Forum
I've got a number of dc current transducers for PCB mounting, i want to
use them to replace resistor shunt circuits. These transducers are open-loop and based on the hall-effect sensor. From the block diagram it appears that an in-amp is used to condition the signal from the hall sensor. Depending on how the transducer is configured you can get 30mV/amp or 60mV/amp.
First question is if any one here has experience of such devices whats your opinion of them and would you have any recommendations?
2. The sensor has a Vref input (probably to the in-amp), what is the purpose of this, what advantage does it offer to me and how should i make effective use of it? I plan to use a 2.5volt reference IC anyhow. The Vref does put an offset on the output i just dont get why this would be required? I think it may be that i can input an AC wave thus this Vref will offset it so that i get the wave swinging around 2.5V rather then 0 (the transducer can only be supplied with +5volt.
3. Some of the specs include RL = Load Resistance >= to 2kohm
Rout = output internal resistance < 10ohms
How should i interpret this data? Should i take RL been the minimum load i should place on the output? Rout not relevant?
4. With 60mV/Amp and a typical range of 0-10Amps i get approx 0-600mV signal, i need to input this to an ADC, should i simply gain this, buffer it and feed straight in to the ADC?
Any comments appreciated!!
mlk
I've got a number of dc current transducers for PCB mounting, i want to
use them to replace resistor shunt circuits. These transducers are open-loop and based on the hall-effect sensor. From the block diagram it appears that an in-amp is used to condition the signal from the hall sensor. Depending on how the transducer is configured you can get 30mV/amp or 60mV/amp.
First question is if any one here has experience of such devices whats your opinion of them and would you have any recommendations?
2. The sensor has a Vref input (probably to the in-amp), what is the purpose of this, what advantage does it offer to me and how should i make effective use of it? I plan to use a 2.5volt reference IC anyhow. The Vref does put an offset on the output i just dont get why this would be required? I think it may be that i can input an AC wave thus this Vref will offset it so that i get the wave swinging around 2.5V rather then 0 (the transducer can only be supplied with +5volt.
3. Some of the specs include RL = Load Resistance >= to 2kohm
Rout = output internal resistance < 10ohms
How should i interpret this data? Should i take RL been the minimum load i should place on the output? Rout not relevant?
4. With 60mV/Amp and a typical range of 0-10Amps i get approx 0-600mV signal, i need to input this to an ADC, should i simply gain this, buffer it and feed straight in to the ADC?
Any comments appreciated!!
mlk