When something goes wrong in an accelerator, like an unsolicited beam dump,
the timing system broadcasts a Post Mortem event (message) and lots of
equipment push diagnostics data with time tags up to the Post Mortem system
for analysis. These PLCs control things like Cryogenics, and other
Hi all,
anyone here has an HP 54540A for sale?
Answers to ik1...@spin-it.com
73 - Marco IK1ODO
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Hello everyone,
Can you, please, help me with finding a service manual and schematics of the
HP counter 5334A. On the Agilent site I can find the 5334B but I know there
are quite some differences between both.
Any info would be appreciated.
Thanks,
bdivi-at-hotmail.com
TBolt Nuts
To keep My TBolt's temperature constant so that the environment has minimal
effect on it,
I use an aquarium temperature controller (modified to have low hysteresis)
connected to a low wattage light bulb, placed in a box with the TBolt.
It works OK and keeps the TBolt's temperature
Heck, Warren, I'll put it on the line :-). Use a very simple and cheap
processor such as a Picaxe, pass the rs232 through it to Lady Heather etc,
and capture the temperature, using it appropriately. Should work nicely
and keeps the temp control local. Even put a little LED on it to indicate
Note you do not have to pass anything thru or output any RS232, just the ONE
bit if the micro is going to control the temp out bit.
It just needs to pick up the Tbolt output data in parallel and capture the Temp
info.
If the micro is not doing the Temp control then there is no need to have the
Another useful feature to add to a completely independent micro controller so
that it needs no other inputs is to have its program smart enough to
automatically and slowly readjust its set point control Temperature to just
above the highest day to day Peak temp it sees. Needs no extra inputs,
This can also be made to work on the TBolt units that have the 1/2 deg course
Temp sensor.
The control loop gets a bit trickier, but it can hold the Temp very close at
one its course transitions points.
This would come in handy for those not wanting to change their sensor to the
high
Just acquired a used 1992 off eBay. Excellent, almost like new with manual
and even spare fuses. I noticed that the internal reference's waveform is
more like a nasty sawtooth than a nice sine wave. Is that normal? Also, when
I hook my GPSDO through a two way splitter and two different length
Putting the PID stuff into Lady Heather is no problem (if you write the
algorithm). It would be pretty trivial to drop it into the DOS version. It
would be best if a single control line would either heat or cool (no OFF
state). Even simpler, keep the fan stirring the air all the time.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark Sims
Sent: Wednesday, August 26, 2009 1:35 PM
To: time-nuts@febo.com
Subject: [time-nuts] Tbolt temperature Control
Putting the PID stuff into Lady Heather is no problem
At 03:34 PM 8/26/2009 , Mark Sims wrote:
The problem is with the Windows code. I don't know how to reliably
control the modem signals under Windows... perhaps John Miles would know.
Most Windows users use USB-
EscapeCommFunction()?
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time-nuts
I use the System.IO.Ports.SerialPort.RtsEnable property
If you're doing input (e.g. looking for a 1pps), I would imagine you'd use the
PinChangedEvent. I haven't tried it or looked at the timing.
These exist in all .NET frameworks from 2.0 onwards.
If you want to use the Windows API
My 1992 has a similarly ugly reference output - until I terminate it.
Then it's a fairly nice square wave between 0 and 1 volt. Rise fall
times are in the range of 5 ns. The manual doesn't state what the wave
shape is, only that it's 600 mVp-p into 50 ohms. I have a brochure
that says TTL
Hi,
your problem should be to adjust to physical reality, then you may
be able to control you TBOLT temperature.
I cannot remember the term in a PID equation that accounts for time
delay.
In fact there is not one! It is the wrong algorithm for controlling
almost any heater!
It is excellent
Neville
My responses to your well stated and mostly accurate 2c worth,
even though much of it does not apply to this situation.
I cannot remember the term in a PID equation that accounts for time delay.
Yea, pretty hard to remember, It called Delay on Smith predictor type of PID.
Sounds like
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