Battery powered measurement
Battery powered measurement
(OP)
Is there a commercially available solution for a battery powered measurement that lasts about 5 days (5x24hrs).
Measurement setup:
6 channels
6 accelerometers
1 data acquisition system
1 data storage (for 5x24hrs)
all this should be continueus, batterypowered.
All help is welcome
rgrds
Wim
Measurement setup:
6 channels
6 accelerometers
1 data acquisition system
1 data storage (for 5x24hrs)
all this should be continueus, batterypowered.
All help is welcome
rgrds
Wim





RE: Battery powered measurement
dgallagher@ghg.net.
RE: Battery powered measurement
RE: Battery powered measurement
RE: Battery powered measurement
Thanks in advance
RE: Battery powered measurement
You do not say what the sampling rate of the measurement will be. Are you just recording the time signals or is some analyis (eg averaged spectra) to be performed online by the acquisition system.
Depending on the sample rate, the amount of storage space for the time signals could be very large. 6 channels times 3600 seconds per hour times 125 hours times 4 bytes per data point = approx 10 Megabytes per 1Hz sampling frequency. Thats 10 Gb for a 1Khz sample frequency. I understand that hard disk drives can be quite power hungry if they are writing continuously.
Michael
RE: Battery powered measurement
The problem with lead-acid battery is that the measurement takes place during flight (of course no plane flies 5 days cont., but during refuelling and loading into another plane measurements should continue) and wet-cell batteries are therefore not allowed.
The sampling rate will be approx. 2kHz (I need approx. 0-1kHz data). I'm just collecting time-data, analysis will be done afterwards.
The hungriness of all the parts (sensors, acquisition, diskdrive etc.) added up is indeed the problem, that's why I'm investigating this.
RE: Battery powered measurement
They come in various sizes and 1 reason I like them is that the ones I use are 12 volt units which most of my equipment is powered with.
My unit is: Sonnenschien A212/5.7S 12 volts 5.7 Ah Dryfit A200
C. Hugh (www.Hatch.ca)