Chapter 11 VirtualBench-Counter
© National Instruments Corporation 11-7 Getting Started with VirtualBench
b. Select the Time/Samples tab, as shown in Figure 11-4.
Figure 11-4. Time/Samples Tab of VirtualBench-Counter Settings Dialog Box
c. Enter the values you want to use for Custom Measurement Time
and Custom Number of Samples.
d. If the times you want to measure are greater than 0.8 seconds for
DAQ-STC based counters or greater than 53.7 seconds for NI-TIO
based counters, check the box at the bottom of the Time/Samples
tab so the Counter uses the slower internal timebase instead of the
maximum.
Note Checking this box causes less accurate readings. However, it allows for longer time
measurements and period measurements of lower frequencies. This is beneficial mainly for
DAQ-STC based devices because it has 24-bit counters that exceed their maximum value
in less than a second when you use the maximum timebase of 20 MHz.
e. If you are using an NI-TIO based counter, the system can divide
the incoming signal before it reaches the counter. This allows for
measuring faster signals. Use the Divide Input Frequency and
Totalize control to determine by what factor to divide incoming
signals for frequency, totalize and frequency ratio measurements.
f. Click OK and continue with your measurements.
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