DA Q Pacer Clock - neoVI
Ma in
A pplies to
neoVI
Blue
Overview
T he ne o VI de vice ca n ge ne ra te a clo ck (figure 1) o n the
MISC 2 pin
tha t ca n be use d to co rre la te da ta co lle cte d with the ne o VI de vice with o the r da ta a cquisitio n e quipm e nt tha t a cce pts a n e x te rna l clo ck . T he clo ck ra te is
pro gra m m a ble be twe e n 1.25 Khz a nd 2.5 Mhz (Se e ta ble 1 fo r fre que ncie s).
T he ne o VI de vice s tim e sta m ps the e x a ct sta rt tim e o f the pulse s. T his sta rt tim e sta m p pro vide s a m a rk e r to co m pa re da ta fro m the DAQ bo a rd a nd the ne o VI.
How to use it
T he fo llo wing list o f ste ps sho ws ho w to use this fe a ture :
Step 1
: W ire the MISC 2 signa l to the DAQ ca rd e x te rna l clo ck input
Step 2
: Se tup the
MISC 2 Signa l a s a digita l o utput
in ne o VI e x plo re r
Step 3
: Sta rt Mo nito ring the ne two rk
Step 4
: Sta rt the DAQ C a rd Da ta Acquisitio n fo r a n e x te rna l clo ck with the de sire d num be r o f sa m ple s
Step 5
: Se nd the
Sta rt DAQ ne o VI De vice Virtua l Ne two rk C o m m a nd
to sta rt the clo ck . ne o VI will se nd a ne o VI De vice Ne two rk m e ssa ge tim e -sta m pe d whe n the DAQ C lo ck wa s sta rte d.
Step 6
: R e co rd ne two rk m e ssa ge s fro m the ne o VI until the DAQ ca rd ha s a cquire d the pro pe r num be r o f sa m ple s
Step 7
: Afte r the DAQ C a rd co m ple te s its sca n, a sse m ble the DAQ ca rd da ta a nd ne o VI m e ssa ge buffe r in to o ne buffe r using the sta rt tim e sta m p. Ana lyze , displa y o r sto re yo ur re sults.
Step 8
: Se nd the
Sto p DAQ ne o VI De vice Virtua l Ne two rk C o m m a nd
to sto p the DAQ C lo ck .
Figure 1 - neoVI generates a pulse at a frequency which is time correlated with the neoVI timestamp.
Table 1 - Sampling Frequency for the DA Q Pacer
neoVI Virtual Network Command Byte 1 Setting
Sample Frequency
0
2.000 KHz
1
8.000 KHz
2
32.000 KHz
3
40.000 KHz
4
80.000 KHz
5
160.000 KHz
6
400.000 KHz
7
800.000 KHz
8
1.600 MHz
9
4.000 MHz
neoVI Documentation - (C) Copyright 2000-2019 Intrepid Control Systems, Inc.
La st Upda te :
Thursday, July 09, 2009
Intrepid Hardware Help
DAQ Pacer Clock
47 / 71
Summary of Contents for neoVI
Page 60: ...Last Update Friday September 13 2013 Intrepid Hardware Help LED Blinking 58 71 ...
Page 63: ...Last Update Tuesday January 08 2013 Intrepid Hardware Help General Purpose IO 61 71 ...
Page 67: ...Intrepid Hardware Help General Purpose IO 65 71 ...
