Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Current Measurement - help needed with shunt resistor

Status
Not open for further replies.
S

sureshamathew

Newbie level 3
Joined
Jul 31, 2009
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,309
Current Measurement

Hi,

My requirement is to measure currents in the range 10uA to 100mA (resolution = 10uA). I also have a NIDAQ(6105) with a resolution of 100uV (appx) to log the voltage data automatically. I am planning to use LTC6100 so that I can amplify the current more so that the DAQ can log the data. The LTC6100 requires a minimum sense voltage of 300uV to work. However, the value of the sense resistor seems to be a real problem. For 100mA currents, the voltage drop is just too large. Is this is the best way to do it?

- Suresh
 

Re: Current Measurement

You may have to consider connecting several shunt resistors to cover all required ranges .. see attached picture ..
Switching can be done with, for example, MOSFETS, as they have channel resistance Rds(ON) well below 0.1Ω ..

Rgds,
IanP
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top