User`s guide

18
The Reset button, at the bottom of the window, is used to clear all readings, and
resets the current value to zero.
The Memory button is a feature available only in Interval Function. Pressing
Memory shows the previous reading in a black box, to the right of the current read-
ing. The memory reading is toggled on and off by tapping the Memory button.
Pressing Reset clears the values stored in the memory.
Similar to Memory, the Hold feature is used in Frequency, Period and Count
Functions. Pressing the Go button on the enclosure holds the value taken at the
instant the button is depressed, and displays it in a black box at the right of the
screen. The held value stays until either the reset button is hit or the Go button is
pressed again. Pressing the Go button again replaces the held value with a new
reading.
Interval Function
The Interval Function uses one or two photogates to record time intervals. This
window is displayed in Figure 13. There are three ways to use the Interval Func-
tion: using Photogate A only, using Photogate B only, or using both Photogate A
and Photogate B. These uses are depicted in Figure 14 on page 19.
Using only one photogate plugged into the Photogate A port, the DataCollector
records the time that photogate A’s beam was interrupted. The time measurement
begins when the light beam is broken in photogate A, and stops when the light
beam is unbroken again. This time is labeled T
A
.
Using only one photogate plugged into the Photogate B port, the DataCollector
records the time that photogates B’s beam was interrupted. This time is labeled
T
B
.
With two photogates plugged in, the DataCollector reports times for both photo-
gates, as well as the time between interrupting photogate A’s beam and photogate
B’s beam.