I'm doing some progress with my new heater. The PID regulates well, but is (I imagine) too slow when put in real service. A bigger temp change takes some time to adjust and as it happens, the electronics inside the heater (the reference amp stuff) contribute to the heat. So, when the PSU is off but the oven is on I imagine that turn on will rise the temperature, adding time to stabilize. That somewhat defeats the purpose of having the oven run on all time. I'm sure I can figure it out somehow.
Anyway, I plead to you who owns a PD2005 to help me! I really could use two key facts.
1) What is the running temp inside the oven with the thermostat drive?
2) What is the power of the heater?
These two key facts is really easy to measure. The first one only need a screwdriver.
1) The outer (red) shield is held in place by three screws in the socket. They don't need to be removed, only loosened. Then, the shield will come off if you turn it slightly and then it just separates. Inside, you will find a inner tube covered with isolation, but with a end cap that is not covered. The end cap comes off with two screws. Then you can stick a common thermocouple or whatever inside the electronics package ant measure the temperature.
I'm not proposing anything destructive here! You can reassemble the end cap and the shield as easy as it comes off! I'm not suggesting that you should break or harm your 2005 for me! 2) The second does even not need dismantling anything besides removing the cover of the unit! Do like this:
A) Turn off the device (front panel switch. This is to break the transformer from the heater).
B) Disconnect the unit from mains (not only for safety, but also because you otherwise will try to measure ohms of a live wire).
C) Measure resistance between pin 9 and pin 10 on the heater assembly socket (clearly marked on the socket)
D) Measure resistance of the thermostat (in "on" position presumably), between pin 11 and 9.
There are some caps in parallel with the heater and thermostat so please measure "common" ohms on a simple multimeter, not a real LCR meter doing AC measurements.
Its easy! A temperature and two resistances. It will not break your unit (if you aren't incredible clumsy)!
First one that comes up with those digits will be mentioned on the PCB of my second spin of my new PID regulator!
...make that the two first. One brave first, and one for confirmation!
