Omega OMB-DAQBOARD-3000 Manuel D’Utilisation

5-12   Counter Input Modes  

918494 

DaqBoard/3000 Series User’s Manual  

 
 

PULSEWIDTH:  OPT2:  Determines whether the pulsewidth is to be measured with a 16-bit (Counter 
Low), or 32-bit (counter High) counter.  Since pulsewidth measurements always have the “stop at the top” 
option enabled, this option dictates whether the measurement has a range of 0 to 65535 ticks, or 0 to 
4,294,967,295 ticks.  

PULSEWIDTH:  OPT4:  Allows the mapped channel to gate the counter.  When the mapped channel 
is high, the counter is enabled to count.  When the mapped channel is low, the counter is disabled, but 
holds the count value.   The mapped channel can be any other input channel. 

PULSEWIDTH:  OPT6:  This allows the mapped channel’s pulsewidth to be measured instead of the 
input channel.  The mapped channel can be any other input channel (post debounce). This option allows 
the counter to be used with any other input channel (post-debounce).  If the channel’s input is used 
elsewhere, for example, gating another counter, the counter for this channel does not need to go unused.  

The 3000 Series board has the ability to measure the pulsewidth of an input and the time between any two 
edges on any two inputs.  The time ranges are similar to those shown for period mode except that averaging 
is not available.  The ranges given below reflect this.   

 

Lower 16-bits of the 32-bit Counter 

Range (S) 

Ticksize (nS) 

Averaging 

Option 

 

Range (S) 

Ticksize (nS) 

Averaging 

Option 

800 – 80000 

20833.333 

1 

 

10m – 1 

20833.333 

1 

80 – 8000 

2083.333 

1 

 

1m – 100m 

2083.333 

1 

8 – 800 

208.333 

1 

 

100u – 10m 

208.333 

1 

800m – 80 

20.833 

1 

 

10u – 1m 

20.833 

1 

 
 

Full 32-bit Counter  
Range (S) 

Ticksize (nS) 

Averaging 

Option 

10m – 80000 

20833.333 

1 

1m – 8000 

2083.333 

1 

100u – 800 

208.333 

1 

10u - 80 

20.833 

1 

 

 

Full 32-bit Counter     <1 ppm 

Range (S) 

Ticksize (nS) 

Averaging 

Option 

Range (S) 

Ticksize (nS) 

Averaging 

Option 

2 – 80000 

20833.333 

1 

20 – 80000 

20833.333 

1 

200m – 8000 

2083.333 

1 

2 – 8000 

2083.333 

1 

20m – 800 

208.333 

1 

200m – 800 

208.333 

1 

2m – 80 

20.833 

1 

 

20m – 80 

20.833 

1