Measurement Computing WBK17 - Manual (Page 18)

WBK17, pg. 18 987996 WBK17, Counter/Encoder Module
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) or one of the detection
signals (on any channel). This option allows the counter to be used with any other input channel (post-
debounce), or with one of the detection signals. 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 WBK17 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 Lower 16-bits of the 32-bit Counter
Range (S) Ticksize (nS) Averaging
Option
Range (S) Ticksize (nS) Averaging
Option
800 – 80000 20000 1 10m – 1 20000 1
80 – 8000 2000 1 1m – 100m 2000 1
8 – 800 200 1 100u – 10m 200 1
800m – 80 20 1 10u – 1m 20 1
Pulsewidth and Time Ranges for a 16-bit Value
Sampling error is less than 0.2%
Full 32-bit Counter
Range (S)
Ticksize (nS) Averaging
Option
10m – 80000 20000 1
1m – 8000 2000 1
100u – 800 200 1
10u - 80 20 1
Pulsewidth and Time Ranges for a 32-bit Value
Sampling error is less than 0.2%
Full 32-bit Counter <10 ppm Full 32-bit Counter <1 ppm
Range (S) Ticksize (nS) Averaging
Option
Range (S) Ticksize (nS) Averaging
Option
2 – 80000 20000 1 20 – 80000 20000 1
200m – 8000 2000 1 2 – 8000 2000 1
20m – 800 200 1 200m – 800 200 1
2m – 80 20 1 20m – 80 20 1
High Accuracy Pulsewidth and Time Ranges for a 32-bit Value
that has little sampling error (<10ppm, <1ppm)