Omega OMB-DAQSCAN-2000 Series Manuale Utente

 

8-4   Taking Measurements     

898095

 DaqScan/2000 

Series 

Channel Sampling Interval  
In regard to analog input, DaqScan/2001 and DaqScan/2005 allow for programmable 

sampling intervals of 5 us, 10 us, or 1000 us on a per channel basis.  This mode allows some 

DBK expansion channels [that change slowly for a higher degree of accuracy] to be sampled at 

a longer interval, and channels that change more rapidly to be sampled at a shorter interval. 

Each 5 µs, 10 µs, or 1000 µs interval reduces the maximum aggregate acquisition rate for the 

entire scan by that amount. 

There are 40 Digital I/O channels available to DaqScan/2000 Series devices.  The channels are 

grouped as follows: 

  8 Channels, A0 through A7 from P2 Port A 

  8 Channels, B0 through B7 from P2 Port B 

  8 Channels, C0 through C7 from P2 Port C 

  16 Channels, Digital 0 through Digital 15 from P3 

The devices allow for either synchronous scanning of digital input channels or asynchronous 

I/O operations for all configured digital channels.   

DaqScan/2000 Series devices allow synchronous scanning of four16-bit counter input 

channels.  The 4 channels can be cascaded into two 32-bit counter channels.  For either 

cascaded or non-cascaded counter channels each channel can be configured for:  

• 

Pulse Counting Mode – specifies that each counter should be cleared upon being 

read and placed into the input scan.  

• 

Totalize Counting Mode – specifies that each counter is to free-run and not be  

cleared during the input acquisition.  

DaqScan/2000 Series devices allow clocking of the synchronized inputs either by an internal, 

programmable pacer clock or by external clocking.  These products use a sequencer to 

implement a multiplexing approach to gathering the input data.  This means that with either 

internal or external clocking the entire channel scan (including the sampling time for each 

channel) may not exceed the maximum aggregate rate of 200 kHz.  

DaqScan/2001 and DaqScan/2004 allow synchronous output of any available D/A channels 

at up to 100 kHz for each channel.   All D/A channels may have output clocked out 

synchronously.    

Each of the four D/A channels for DaqScan/2001 and DaqScan/2004 can be configured for 

waveform output individually.  If the D/A channel is not configured for waveform output it 

then is available for asynchronous output operations.   

DaqScan/2001 and DaqScan/2004 allow clocking of the synchronized output by the acquisition 

clock source, an internal, programmable pacer clock or by an external clock source.  When the 

clock source generates a new clock signal all outputs are updated concurrently.  Regardless of 

the clock source, the clock may not exceed the maximum update rate of 100 kHz.