Tech Note 1022 Detail

Sine Wave Generator output is not measurable.

Affected Products:

WA-9867 Sine Wave Generator

Problem/Symptom:
Sine Wave Generator output is not measurable.

PASCO Solution:

The WA-9876 Sine Wave Generator uses a Class D amplifier at the output. For this type of amplifier, neither side of the output is referenced to Earth ground. If you connect a scope directly to the output, then you will short out the signal.

To see the sine wave with an oscilloscope you will need to use a Class D filter circuit before your oscilloscope. See Active-filter circuit and oscilloscope inspect a Class D.

Creation Date: 07/14/2009
Last Modified: 12/3/2013
Mod Summary: