Gcdc x500 x250 x50 User Manual

7/22/2019 Gcdc x500 x250 x50 User Manual

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USB Impact AccelerometerModels X500-2, X250-2, X50-2

1 Features 3-axis accelerometer

500g, 250g, or 50g range

14-bit resolution

User selectable sample rates of 8, 16,

32, 64, 128, 256, and 512

nternal !i"ol# batter# c$arges %ia U&'

User selectable deadband and trigger

(ccurate )5 ""*+ time stamped data

using eal ime .loc/ ).+

ata recorded to a remo%able micro&

card )2' included+

asil# readable comma separated textdata files

ata transfer compatible it$ indos

or !inux %ia Uni%ersal &erial 'us)U&'+ interface )no special softare+

stem appears as U&' *ass &torage

e%ice to indos and !inux &s7

eig$s 172o )33g+

! indicator lig$ts for s#stem status

2 Applications

$e 9500-2, 9250-2 and 950-2 are applicableto man# pro:ects and experiments in%ol%ing

$ig$ accelerations;

"ro:ectile impact studies

, and ? axesand stored at a rate of up to 512


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USB Impact Accelerometer Models X500-2, X250-2, X50-2

3.1 Operating Instructions

$e 9500-2, 9250-2 and 950-2 are economical solutions for e%aluating $ig$ g-force e%ents7 $e

s#stem is designed to pro%ide a simple met$od to gat$er impact data and @uic/l# deli%er t$einformation for anal#sis7 $e folloing instructions outline t$e steps to begin using t$e 9500-2,

9250-2 or 950-2 products7 .onfiguration settings and mounting met$ods ill depend on t$e

particular application7

&tep 1; nsure t$e internal lit$ium-pol#mer batter# is full# c$arged b# pluggingt$e de%ice into a computer U&' port7 $e red !1 ill turn off $en

t$e batter# is full# c$arged )see section37272+7 n indos, do not use

Aotepad as t$e editor does not terminate ne lines properl#7 ..recommends indos ordpad to edit t$e config7txt file7

&tep 2; .onfigure t$e de%ice b# editing t$e appropriate tags in t$e config7txt file7

efer to section37274for configuration options7

&tep 3; f necessar#, initialie t$e . cloc/ b# creating a time7txt file )see

section37276+7 &etting t$e . ensures t$at recorded data can becorrelated to absolute time7

&tep 4; Unplug t$e de%ice from t$e U&' port and firml# attac$ t$e s#stem to t$e

target ob:ect7 epending on t$e g-force intensit# expected, tape, tie-

raps, pipe clamps, or glue are suitable met$ods of attac$ment7 $e07B5C D6-32 scre can be replaced it$ a longer scre to firml# attac$

t$e enclosure to t$e target ob:ect7

&tep 5; "ress t$e button located at t$e rear of t$e enclosure to initiate data

recording, )see Eigure 2+7 $e red !1 ill blin/ as t$e configurationfile is accessed7 f t$e time7txt file is present, t$e . is initialied it$

t$e time ritten in t$e file7 $en, t$e blue !2 ill begin to blin/ at

one second inter%als indicating t$e s#stem is operating7 $e red !1ill blin/ periodicall# as data is ritten to t$e micro& card7

&tep 6; o stop recording, press and $old t$e button for about 3 seconds7 $e

red !1 and blue !2 ill blin/ rapidl# for 2 seconds and t$en turn

off7 elease t$e button and t$e de%ice turns off7 ata recording isrestarted b# pressing t$e button again )see &tep 5+7

Fiure 2! Startin t#e Data "oer

February 2013 Rev K 2 of 14

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3.2 Electrical

3$2$1 Sensor

$e 9500-2, 9250-2, and 950-2 data loggers use analog **& accelerometer sensors7 $e sensors

and serial number tags are color coded according to sensor range; 500g F blueG 250g F $ite )or nocolor+G 50g F red7 $e logger 15 c$aracter serial number starts it$ ...1999, $ere 999 is 500

)500g+, or 250 )250g+, or 050 )50g+7 (ll configurations use a semi-transparent blue plastic enclosure7

$e analog sensors commonl# ex$ibit an offset error of 2-3H due to t$e biased %oltage output7

&ubtract or add t$e appropriate amount to cancel t$e offset error and produce a accurate reading

t$roug$out t$e full-scale7

$e 250g and 50g %ersions ex$ibit a -3db roll off at 400


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3$2$2 Indicator "Ds

stem status is indicated b# t$e to !s )see Eigure 4+7 $e blue !2 blin/s once per second

indicating a properl# operating s#stem7 $e red !1 ill lig$t $en t$e de%ice is connected %ia t$e

U&' and t$e lit$ium-pol#mer batter# is c$arging7 $e ! c$arge indicator ill turn off $en t$ebatter# is full# c$arged7 n data logging mode, t$e red !1 blin/s $en data is ritten or read from

t$e micro& memor# card7 $e period at $ic$ t$e red !1 blin/s depends on t$e sample rate and

ot$er configuration settings7 $e red !1 ill also blin/ diml# it$ U&'


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%a&le 2! 'on/iuration File %as and Descriptions

Ta! "a#i$ %ettin!s e&au#t es'ripti(n

deadband (n integer beteen

0 and 32B6B

0 &ets t$e deadband to a range expressed in KcountsC7

( ne sample is recorded if an# sensor axis

exceeds t$e pre%ious recorded reading b# t$e

deadband %alue

deadbandtimeout (n integer beteen0 and 65535

3 &pecifies t$e period in seconds $en a sample isrecorded regardless of t$e deadband setting7 $is

feature ensures periodic data is recorded during

%er# long periods of inacti%it#7

dell (n integer beteen

0 and 65535

1 $e number of samples recorded after a deadband

t$res$old triggered e%ent

microres - ff $e presence of t$is tag sets t$e de%ice to record

time stamps it$ 071ms effecti%e precision7

rebootondisconnect - off on disconnect $e presence of t$is tag causes t$e s#stem to startrecording after disconnect from a U&' port7

rtccloc/trim (n integer beteen-12B and 128

0 Eine ad:ustment for . correction

samplesperfile (n integer greater

t$an 0

288J6 $e number of lines of data per data file before a

ne file is created

samplerate 8, 16, 32, 64, 128,

256, 512

256 &ets t$e rate at $ic$ data is collected and recorded

to t$e micro& card7

starttime and stoptime &ee section 372747J - efines $en to start and stop recording

stopon%usb - ff &tops data logging if 5% U&' poer is present )see

section37274710+

statusindicators KAormalC, K


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%a&le 3! Dead&and 'alculation

M($e# ea$ban$ +(unts

9500-2 16384Ng=1500

9250-2 16384Ng=625950-2 16384Ng=130

Fiure 5! rap#ical Illustration o/ t#e Dead&and Feature

3)2)*)2 $ea$ban$time(ut

KdeadbandtimeoutC defines t$e period in seconds $en a sample is recorded b# t$e de%ice regardless

of t$e deadband setting7 $is feature ensures periodic data is recorded during extended periods of

inacti%it#7 ( %alid setting for t$e deadbandtimeout is an integer beteen 0 and 655357

3)2)*)3 $,e##

$e KdellC tag defines t$e number of consecuti%e samples recorded at t$e set sample rate after adeadband t$res$old e%ent7 $e deadband t$res$old e%ent occurs $en a sensor reading exceeds t$e

last recorded %alue b# t$e deadband setting7 ( %alid dell setting is an integer beteen 0 and 655357


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Fiure ! rap#ical Illustration o/ t#e Dell Feature

3)2)*)* mi'r(res

$e KmicroresC option sets t$e de%ice to record time stamps it$ 071ms precision7 n micro-resolutionmode, t$e time stamps are recorded as 997>>>>?? $ere 99 are seconds, >>>> are 071

milliseconds, and ?? are spurious digits t$at s$ould be ignored7 $e micro-resolution option s$ould be

implemented at sample rates of 128 $ert or greater to pro%ide t$e best timing precision7

3)2)*)5 reb((t(n$is'(nne't

$e de%ice incorporates an on=off button for initiating and terminating t$e data recording process7ata recording automaticall# starts upon disconnect from a computer U&' port if t$e tag ord

KrebootondisconnectC is included in t$e configuration file7

3)2)*) rt''#('.trim

$e Krtcclcoc/trimC setting ad:usts t$e . oscillator fre@uenc#7 "ositi%e %alues increase t$e

oscillation period )loer fre@uenc#+ and negati%e %alues decrease t$e oscillation period )$ig$erfre@uenc#+7 ( %alid setting is an integer beteen -12B and 1287 '# default, t$e . pro%ides O=-

2ppm )parts per million+ precision beteen 0P. and 40P.7 $is feature s$ould be used b# ad%anced

users onl#7

3)2)*)/ samp#esper&i#e

KsamplesperfileC defines t$e number of data lines eac$ file can $a%e before a ne file is created7 $istag controls t$e sie of t$e data files into easil# manageable lengt$s for later processing7 $e user

s$ould exercise caution before setting large files and test t$e end-user application for data limitations7

Users s$ould limit t$e maximum file sie to no more t$an 500000 lines7

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3)2)*) samp#erate

$e KsamplerateC tag defines t$e inter%al t$at data is recorded in


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3)2)*)13 Examp#e +(n&i!urati(n Fi#es

$e folloing example configurations use t$e 9250-2 model to describe t$e basic features of t$e datalogger7 $e concepts are also applicable to t$e 9500-2 and 950-2 models but t$e specific settings

reference t$e 9250-2 model7

xample (+ $e folloing configuration records data constantl# at 256 $ert7 $e de%ice ill initiate

data logging it$ a press of t$e on=off button7 ata files are 50,000 lines long or about 3 minutes eac$7

Fiure ! 'on/iuration File 4ample A

xample '+ $e de%ice ill record 3 seconds of data at 512$ if motion abo%e 20g is detected on an#axis7 ( data sample is recorded e%er# 5 minutes7 $e 9250-2 boots and begins operation once

disconnected from a $ost U&' port7

Fiure ! 'on/iuration File 4ample B

3$2$5 Data Files

ata is ritten to files in comma separated text format starting it$ t$e file $eader information and

folloed b# data entries7 $e $eader describes t$e s#stem configuration, firmare %ersion, and t$eprecise time $en t$e file as created7 ac$ $eader line is preceded it$ a semicolon )KGC+7 able 5

lists t$e %alid $eader tags7 ata entries include a time stamp and t$e ra accelerometer sensor

readings from t$e 9, >, and ? axes7 $e time stamp is seconds elapsed from t$e start time recorded int$e $eader7 $e ra sensor data format is signed digital KcountsC from t$e (= con%erter7 able 4

lists t$e e@uations for con%erting t$e counts data into g )standard acceleration of gra%it#+7

$e de%ice creates a ne data file $en t$e s#stem is booted or $en t$e maximum number of datalines is reac$ed in t$e pre%ious data file7 ( s#stem boot condition occurs $en t$e on=off button ispressed, 5% poer is restored to t$e s#stem %ia t$e U&' connector, or $en t$e de%ice is remo%ed

from a computer U&' port it$ t$e KrebootondisconnectC feature enabled7 ata files are placed in a

folder named K..C and are named data-9997cs%, $ere 999 is a se@uential number starting it$0017 $e s#stem ill create up to JJJ files7 Eigure J represents an example data file7

February 2013 Rev K J of 14

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$e last line of t$e final data file records t$e reason for t$e termination, suc$ as Ks$utdon; sitc$edoffC, Ks$utdon; lo batter#C, Ks$utdon; max files exceededC, Ks$utdon; %bus disconnectC, or

Kconnected to computerC7 $e line is designated as a comment it$ a semicolon )KGC+7

Fiure 6! 4ample Data File

%a&le ! 'on7ertin 8a 'ounts Data to Units

M($e# !

9500-2 )counts+ N 1500 = 16384

9250-2 )counts+ N 625 = 16384

950-2 )counts+ N 130 = 16384

%a&le 5! Data File 9eader %as

Ta! es'ripti(n

eadband ( ne sample from t$e sensor must exceed t$e last reading b# t$e deadband %alue

eadbandimeout $e period in seconds $en a sample is recorded regardless of t$e deadband setting

ecimate &ee section 5

ell $e number of samples recorded after a t$res$old e%ent


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3$2$ 8eal %ime 'loc:

( real time cloc/ ).+ is used to determine time for eac$ line of data recorded7 nitialiing t$e .

ensures t$at t$e start time and indi%idual time stamps can be correlated to an absolute time7 (n

uninitialied or reset . defaults to t$e first da# of t$e #ear 1J007

$e . is set using a text file named Ktime7txtC located in t$e root director# of t$e micro& card7$e s#stem loo/s for t$e time7txt file upon booting7 f t$e file exists, t$e time stored in t$e file is

loaded to t$e . and t$e time7txt file is deleted7 $e time information in t$e time7txt file must be in

t$e exact K####-**-dd


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3.3 Mechanical

$e electronics are enclosed in a t$ree-part semi-transparent blue plastic enclosure7 $e top and

bottom enclosure components and t$e printed circuit board are secured toget$er it$ a 07B5C long D6-32 scre and nut7 !onger scre lengt$s can facilitate attac$ment of t$e data logger to ot$er structures7

( slip-on cap protects t$e U&' connector7 $e de%ice eig$s 172o )33g+7

3$3$1 Dimensions

Fiure 10! nclosure Dimensions

3$3$2 Assem&l.

Fiure 11! 4ploded ;ie o/ USB Impact Accelerometer


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1.01

1.04

4.10

0.75" Length#6-32 Machine Screw

PCB Encl!re$%&

PCB Encl!reCa%&

PCB Encl!reBtt'&

(n)(** Bttn

#6-32 +e, t


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So/tare

$e de%ice records data to comma delimited text files and uses text based files for configuration

settings7 $erefore, no special softare is re@uired to utilie t$e data loggers7


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Fiure 12! 4ample 'on/iuration Usin Decimate Feature

$e 9500-2 configuration in Eigure 12 ill record 32 samples at 2048

Gcdc x500 x250 x50 User Manual

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