holyhobgoblin
Member
Easy I built MikeVT version in less than 30 minutes, it don't look pretty but did the job I needed.hi guys i like the look of the 4-20mA & 2-10Vdc Current Generator , how hard is it to build one, has anyone got a picture of the one they have build, what's needed thanks stu
Thanx for you input, i thought it may be the resistors. Guess its time to play around with the soldering iron again.holy guy
your problem is with the resistors, make one a little different so you can use it even lower the 32 is a little high (some machines can not cope above 25 mA.
Use a variable resistor (potmeter to find both setting and then solder the value with a fixed one in.
An RTD simulator is very easy to build by using some resistors and a turnswitch.
best is to use a four deck switch and soler the resistors direct on the switch.
I just downloaded a resistance table for RTD (Pt100) so i'll pick some resistance values from it to make the simulator.
Here is a simpler version of mine without the milivolt source.
If you look at the upper diagram it shows how it works.
The lower diagram shows the actual circuit.
The nice thing about this it both sources and simulates, it doesn't even need a battery to simulate.
A page or so back I show the full blown version with thermocouple / RTD simulation (millivolt / resistance)
I made mine over 30 years ago, in that time i have replaced a couple of switches and many batteries but it's never needed re-calibration.
Roy
Thanx Roy, I saw you version earlier in the post but i was unsure on how to build it, I was unsure of the symbols you used. Do you have a parts list for your simulator? I like how you can simulator mV & resistance.
Thanx again folks for your help