4-20 mA signal

Hello friends,
special thanks to Jon Elson.
I solved the thing finally this way:
I put a low 9 V batery, a 500 Ohm and a 5 kohm potenciometer and the
multimeter in series. Then dry without the user, adjusted
first the 500ohm pot to limit max amperage to 20 mA.
Then hooked the hole stuff on the input of the valve together with the
power supply 24VDC and readjusted the 20mA (416 ohm whent down to 270
ohm). Now I were able to play with the amperage on the safe side
between 0 and 20 mA. But anyway the interface board is dead, so I will
be able to play again when I will have got the spare part from Fisher.

Until then good luck to all
Sven Peter