Thanks for your help on the previous question. I set up my wheatstone bridge to pins 2 and 3 of the amp. When I use a voltmeter, I see differences over the bridge as a function of resistor change. When I put my voltmeter on the output of the INA128, I see a constant voltage of ~100mv. I am supplying with 3V with the reference pin directed to ground. The voltage is 100mv even with NC at pins 2 and 3. I would have thought it should be at 0. Any advice would be appreciated.
Asked
Active
Viewed 221 times
0
-
4Could you provide a schematic of your circuit? It would make it much easier for us to follow what you are saying. – The Photon Jan 01 '13 at 22:37
-
Have you added the RG resistor? The part should somehow change the voltage unless something is missing or the part is bad. – Gustavo Litovsky Jan 02 '13 at 00:02
1 Answers
5
INA128 has a minimum supply voltage of 4.5V.
You are attempting to use it at 3V. I'm not surprised it doesn't work at all.
This is on the first page of the datasheet. I strongly suggest you read the datasheet before designing a circuit.
markrages
- 19,905
- 7
- 59
- 96
-
You are not exceeding that, but you are also not exceeding the 4.5V minimum supply. – markrages Jan 02 '13 at 01:19
-
1