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Oscilloscope
I recently purchase a small single change digital oscilloscope. Typical for Chinese supply the instruction provided are terse. These are some additional notes.
Measurement options:
| Type | Display | Description | Unit | 
|---|---|---|---|
| Freq | Frequency | Hz | |
| PKPK | Peak to Peak Voltage | Volts | |
| Mean | Mean Voltage | Volts | |
| RMS | Root Mean Square Voltage | Volts | |
| Amp | Amplitude, the voltage between signal peak voltages | Volts | |
| Duty | Duty cycle (percentage of time +) | % second/second | |
| Wid+ | (T+) | Period of the signal + | seconds | 
| Wid- | (T-) | Period of the signal - | seconds | 
| Perd | Period of signal | seconds | |
| Max | Minimum voltage | Volts | |
| Min | Maximum voltage | Volts | |
| Top | Top + voltage | Volts | |
| Base | Lowest - Voltage | Volts | |