PASCO WA-9867 Sine Wave Generator - Manual (Page 5)

Model No. WA-9867 Operation
5 ®
Operation
In addition to the description given here, there is a complete operational flow chart on page 10.
Manual Control
Amplitude
Adjust the amplitude of the output signal with the Amplitude knob. The amplitude range is
approximately 0 V to 10 V.
Frequency
Set the output frequency with the Coarse and Fine Frequency knobs (labeled “1.0” and “0.1”).
The LED display indicates the frequency to 0.1 Hz resolution. When the Sine Wave Generator is
first turned on, it outputs the default frequency of 100 Hz. You can adjust the output signal from 1
Hz to 800 Hz.
The Frequency knobs are mechanical encoders with 24 discrete detents, or clicks, per revolution.
One click of the Fine knob changes the frequency by 0.1 Hz. One click of the Coarse knob
changes the frequency by 1.0 Hz if the knob is turned slowly, or 4.0 Hz if the knob is turned
quickly. This allows you to change the frequency more quickly over a large range.
You can also use the Up and Down Increment keys to change the frequency. Each quick press of
the Up or Down key changes the frequency by the stored increment. By default the increment is
100 Hz. To change the stored increment, see the Increment Keys section below. (If you press and
hold the Increment keys, a different function will occur, so only use quick presses to change the
frequency.)
This following sections describe how to change the stored frequency increment and program the
Sine Wave Generator to play automatic sequences of notes. If you would like to skip to some
practical demonstrations, see the Applications section on page 11.
Increment Keys
The Up and Down arrow keys have multiple functions. The Increment function is activated by a
single quick press and release of either key. Other functions are activated when you press and hold
the keys. For example, to implement the Play function you would press and hold the Up arrow
key for about 1 second. The instructions may read, “press and hold the Play key,” or, “press the
Up Increment key.” Both refer to the same key, but different functions. The labels below the keys
(Store/Exit and Play) indicate the press-and-hold functions of the keys.
Changing the Output Frequency by the Stored Increment
Each quick press of the Up or Down Increment key changes the output frequency by the amount
stored as the increment. The default increment (when unit is initially turned on) is 100 Hz. Thus, a
single press of the Up Increment key will add 100 Hz to the output frequency. Try this: