We have isolated the problem. On the output of the AD420 (the 4-20mA Iout line pin 18) we had a transient voltage suppressor which when remove led to the drift being eliminated. For some reason the transorb was causing the analog drift on…
I have a question about the 22 pin (NC pin) of AD420.
In an old specification, I think that 22 pin was a capacitor connection terminal.
However, it is NC pin now.
Because my circuit was designed in old time, the capacitor (3300pF) is connected…
By mistake, I have provided -12V instead of +12V to the AD420.
I have measure the output, it is giving 9.93V on Pin 17.
Have I lost the IC? Any solution for that.
How can I test or check, whether it will work or not?
I have prepared circuit using LM358N op-amp for output voltage range -2.5V to +2.5V, as per attached file.
But it is not giving proper output. What may be the issue in it?
I use an AD5420 to produce a precise 0-20mA output current.
Is it preferrable to compensate the offset and gain errors by firmware or there is some internal compensation circuitry in the AD5420 to do this ?
In the AD420 the compensation can…