Omega OMB-DAQBOARD-3000 Series User Manual page 60

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.
Pulsewidth and Timing mode Accuracy
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.
Upper 16-bits of the 32-bit Counter
Range (S)
800 – 80000
80 – 8000
8 – 800
800m – 80
Full 32-bit Counter
Range (S)
10m – 80000
1m – 8000
100u – 800
10u - 80
Pulsewidth and Time Ranges for a 32-bit Value
Sampling error is less than 0.21%
Full 32-bit Counter
Range (S)
2 – 80000
200m – 8000
20m – 800
2m – 80
5-12 Counter Input Modes
Ticksize (nS) Averaging
Option
20833.333 1
2083.333 1
208.333 1
20.833 1
Pulsewidth and Time Ranges for a 16-bit Value
Sampling error is less than 0.21%
Ticksize (nS) Averaging
Option
20833.333 1
2083.333 1
208.333 1
20.833 1
<10 ppm
Ticksize (nS) Averaging
Option
20833.333 1
2083.333 1
208.333 1
20.833 1
High Accuracy Pulsewidth and Time Ranges for a 32-bit Value
that has little sampling error (<10ppm, <1ppm)
918494
Lower 16-bits of the 32-bit Counter
Range (S) Ticksize (nS)
10m – 1 20833.333
1m – 100m 2083.333
100u – 10m 208.333
10u – 1m 20.833
Full 32-bit Counter <1 ppm
Range (S) Ticksize (nS)
20 – 80000 20833.333
2 – 8000 2083.333
200m – 800 208.333
20m – 80 20.833
DaqBoard/3000 Series User's Manual
Averaging
Option
1
1
1
1
Averaging
Option
1
1
1
1