Experimental Physics and
Industrial Control System

"Silver" <[email protected]> · Fri, 26 Dec 2008 23:34:01 +0800

hi, Bob:

  may I use a compress record like this?
record(compress, "$(user):compress1")
{
        field(DESC, "average algorithm ")
        field(INP,  "$(user):aiExample.VAL CP NMS")
#       field(INP,  "uc7420:wfDataOut CP NMS")
        field(SCAN, "Passive")
        field(ALG,  "N to 1 Average")
        field(N,    "10")
        field(NSAM, "1")
}
aiExample is from exampel.db coming with example tempelate. here compress will caculate the average value of ai after getting 10 values.
while a question, when I use dbpr compress1 in ioc shell, it shows val is a nil. the average value will be put in it, it must be an array, why the address is nil?

Best wishes
Silver 2008/12/26

======= At 2008-12-26, 22:49:28 you wrote: =======

>Put a number in the SMOO field - like .95
>This will take .95 of the current reading
>and .05 of the previous reading (which is the result of this running average.)
>If the signal is more noisy - make the SMOO field something smaller - closer to 0.
>For something like a strain gauge - I've had this number be as low as .05 - but a step change would take 20 readings to change.
>Bob
>
>
>-----Original Message-----
>From: [email protected] on behalf of ???
>Sent: Thu 12/25/2008 10:43 PM
>To: [email protected]
>Subject: Is it possible to implement a loop in db?
> 
>Merry X'mas and happy new year to every one!
>
>i have a record like this:
>
>record(ai, "17U:ES:ADC-01")
>{
>  field(SCAN, ".1 second")
>  field(LINR, "LINEAR")
>  field(EGUF, "10")
>  field(EGUL, "-10")
>  field(DESC, "ADC Site B Ch 1")
>  field(PREC, "6")
>  field(EGU, "Volts")
>  field(HOPR, "10")
>  field(LOPR, "-10")
>  field(DTYP, "Hy8401ip")
>  field(INP, "#C30 S0 @")
>}
>
>
>The hardware is hytec 8002 and hytec 8401 in VME crate which is used to collect the voltage from an ion chamber after an amplifier. When read the value directly there will have noise. I want to collect ten values and avrage them to putout. Is it possible to implement by a calc record? 
>
>Another thing i am confusing is the time. Epics support 0.1,0.2,0.5 and 1,2,5 seconds scan. The 8401 clock rate can be set at 100khz in max. If i need more higher frequency then 10Hz to obtain the record value, how can i do?
>
>Thank you very much.
>
>???
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>Shanghai, China
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Best regards				 
Geyang 2008-12-26

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System