Scopy Oscilloscope

Introduction

The oscilloscope is the third item from the top in the Scopy instrument menu list, displayed to the far left of the Scopy window, as illustrated below.

The small white squares to the right of the instrument names control the run/stop functions of the instruments, allowing the user to run and stop an instrument without having to have that instrument in the current display. Clicking on the oscilloscope name invokes the top level of the Scopy two-channel oscilloscope, which appears as in the following illustration.

Channel 1 is turned on and off by clicking on the orange circle and Channel 2 is turned on and off by clicking on the purple circle. A channel that is on is indicated by a filled-in circle and a channel that is off is indicated by an empty circle. Scope waveform colors correspond to the circle colors.

A signal source is required in order to introduce basic oscilloscope operation, so we will use the Scopy two channel signal generator to generate sine waves to apply to the two oscilloscope channels. The oscilloscope has two balanced inputs and the signal generator has two unbalanced outputs, so we can connect the positive sides of the oscilloscope inputs to the signal generator outputs and the negative sides of the oscilloscope inputs to ground. A four-pin single-row header is useful to make these connections, and the wire connections are as follows:

Yellow-to-Orange (Signal Generator 1 Output to Oscilloscope 1 Positive Input)
Black (Adjacent to Yellow)-to-Orange/White (Ground to Oscilloscope 1 Negative Input)
Yellow/White-to-Blue (Signal Generator 2 Output to Oscilloscope 2 Positive Input)
Black (Adjacent to Yellow/White)-to-Blue/White (Ground to Oscilloscope 2 Negative Input)

The signal generator is invoked by clicking on the “Signal Generator” name in the instrument menu. The signal generator initializes with both channels turned on and only requires the waveform, amplitude, and frequency to be selected. Click on the Channel 1 menu and set the Waveform for “Sine,” Amplitude for 2 Volts, and Frequency for 1 kHz, then press “Run” as shown in the following illustration. Entries may be made by entering numbers directly and hitting “Enter” or by clicking on the “+” and “-” controls, and the units can be directly selected under the numbers.

Select the menu for Channel 2 and repeat the above procedure. Each channel of the signal generator is now configured to generate a 1 KHz sine wave with amplitude of 2 V, and is connected to the input of a channel of the oscilloscope.

Open the dual channel oscilloscope by clicking on the “Oscilloscope” name in the instrument menu. The oscilloscope initializes with both channels active so Channel 2 should be turned off in order to view Channel 1 only. Set the Time Base for 500 μs/Div and the Vertical Scale for 1 V/Div and click “Run” as shown in the following illustration.

Basic oscilloscope trigger settings are made by clicking on the “Trigger” menu, which appears as shown in the illustration below. For this example, we have set the trigger position at t = 0 seconds, placing the position at the far left of the timescale; we have configured the oscilloscope to automatically trigger on the rising edge of the Channel 1 input signal at a level of 0 volts.

Advanced triggering options are available by clicking on “Advanced” in the Trigger menu. Trigger holdoff san be set between 0 seconds and 1 second, and prevents retriggering during the set interval following a trigger event. Hysteresis is also provided to improve triggering performance on noisy trigger signals. Hysteresis is initially enabled by selecting “on” under the “Noise Reject” heading. The two hysteresis thresholds about the trigger level are then set using the “HystA” and “HystB” controls. Trigger holdoff is set a 0 V and hysteresis thresholds of 50 mV and 0 V about the trigger level of 0 V are set in the illustration below.

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Analog Devices Wiki

Scopy Oscilloscope

Introduction

Analog Devices Wiki

Scopy Oscilloscope

Introduction

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