Re: HP 3421A actuators Message #2 Posted by Andy on 22 Aug 2003, 5:51 p.m., in response to message #1 by Tracy Vermeyen
I have used the actuators to activate relays so I can turn higher voltage devices on and off.
For example, I once hooked a humidifier up to a relay controlled by channel 0 on the 3421a. Then I had two thermocouples to measure both wet bulb and dry bulb temperatures. I used my hp75 to calculate relative humidity from the two temperatures (and a known air pressure) and then had it turn the humidifier on or off to control humidity.
Also, I have a freind who uses his 3421 and his 41cx to control his home sprinkler system (I think he has the digital card option though which gives you more on/off channels). He uses a repeating alarm on his 41cx to call a program which opens and closes valves.
The possiblities are endless!
Enjoy,
Andy
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