User manual

PicoScope 6 User's Guide 123

Average: the spectrum view shows a rolling average of spectra

calculated from all the waveforms in the waveform buffer. This

has the effect of reducing the noise visible in the spectrum view.

To clear the averaged data, click Stop and then Start, or

change from Average mode to Magnitude mode.

Peak Hold: the spectrum view shows a rolling maximum of the

spectra calculated from all the waveforms in the buffer. In this

mode, the amplitude of any frequency band in the spectrum

view will either stay the same or increase, but never decrease,

over time. To clear the peak hold data, click Stop and then

Start, or change from Peak Hold mode to Magnitude mode.

Note: when you switch to Average or Peak Hold mode, there

may be a noticeable delay while PicoScope processes the entire

contents of the waveform buffer, which may contain many

waveforms, to build up the initial display. If this occurs, a

progress bar appears at the bottom of the window to show that

PicoScope is busy:

Scale

Specifies the labelling and scaling of the vertical (signal) axis.

This can be one of the following:

Linear:

The vertical axis is scaled in volts.

Logarithmic:

The vertical axis is scaled in decibels, referred to the level

selected below in the Logarithmic unit control.

dBV: Reference level is 1 volt.

dBu: Reference level is 1 milliwatt with a load resistance of

600 ohms. This corresponds to a voltage of about 775 mV.

dBm: Reference level is one milliwatt into the specified load

impedance. You can enter the load impedance in the box

below the Logarithmic unit control.

Arbitrary dB: Reference level is an arbitrary voltage, which

you can specify in the box below the Logarithmic unit

control.