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

Measuring AC voltage using a PIC

Status
Not open for further replies.
P

prasad70

Member level 3
Joined
Mar 24, 2011
Messages
67
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Activity points
1,690
untitled.PNG

I want to measure 230V AC voltage directly from mains supply line without using a transformer. I tested circuit and it worked but accuracy drops at low voltages. Does it due to la eakge of capacitor ?

Can some one please help?
 

Use a different slope in your code for low voltage ranges. That could bring some linearity in your measurements.
 
yes it depends form the capacitor

can you put the value of the componets at the design.

from which voltage and donw the accuracy is not good
 

R1 - 390K, R2 - 4.7k VR, R3 -100K, C1 - 10MF

Can there be errors due to voltage drop across the Diode ?

Error level increases with sensing voltage. i.e Error at 230V Zero and at 150VAC it was around 6V
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top