![]() As long as the beam strikes the detector in the opposite arm of the photogate, the signal to the timer indicates that the beam is unblocked. An LED in one arm of the photogate emits a narrow infrared beam. These narrow-beam infrared photogates plug directly into the Smart Timer and are used to provide the timing signals. Use With Photogates The Smart Timer is optimized for use with PASCO's ME-9204B Accessory Photogate (available separately). The speedĪnd acceleration measurement features can be enabled or disabled using a switch inside the Smart Timer. Alternatively, the time can be measured directly, and the speed and acceleration can then be calculated by the student. ![]() The Smart Timer can measure speed and acceleration for both linear and rotational motion experiments. The stopwatch mode lets you use the timer as an electronic stopwatch. These modes allow you to measure the speed of an object as it passes through the photogate or between two photogates, or to measure the period of a pendulum. Options include one or two gates, fence, and pendulum modes. The graphics on the keypad aid in the selection of the appropriate timing mode. Timing and calculating values based on inputs from a variety of sensors. The Smart Timer has many different options for Readings due to multiple passes through the same photogate by "understanding" the type of measurement selected and ignoring multiple passes. The Smart Timer's internal microcontroller also eliminates the problem of incorrect With the new fence design and sensing logic, parallax errors are eliminated and timing accuracy is improved considerably over existing timing options. The Smart Timer can calculate velocity before and after a collision between two carts using a single timer. The 0.1 ms resolution is especially useful in some experiments, such as measuring velocity or acceleration during free fall. Features The Smart Timer's memory function makes it easy to time events that happen in rapid succession, such as a dynamics cart passing twice through the photogate, once before and then again after a collision. The Smart Timer measures several types of events detected with PASCO's digital sensors, including speed and acceleration using standard photogates. The Smart Timer offers 0.1 ms timing resolution and an easy-to-use memory function. The PASCO ME-8930 Smart Timer is an accurate, versatile digital timer and measurement system for the student laboratory. To help you with this you will use a Smart Timer. The Smart Timer In many of the exercises in this manual, you will be called upon to measure time intervals and frequencies (number of events occurring in a given time interval). These balances are delicate instruments and should never be overloaded. After the 0.0 g is seen on the readout, you may place your mass on the balance. Pressing the ON/TARE button will re-zero the machine. Balances The balance you will use in the laboratory is a modern, digital balance. ![]() There is also a java applet that shows you how to read the scale on Vernier calipers. Your instructor will show you how to use these correctly. To use the micrometer, place the object to be measured between the jaws and gently tighten the drum until the jaws contact the object, then twist the small knob at the end of theĭrum until a clicking sound is heard. A small knob at the end of the instrument provides a means of tightening the instrument properly. DO NOT OVERTIGHTEN THE DRUM when making measurements. The micrometer is a delicate, high precision instrument and should be treated with great care. Figure 1 A vernier is an auxiliary scale that can be moved relative to a fixed scale the vernier provides a way of accurately interpolating between scale divisions on the fixed scale.
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