Specifications

Figure 30

The three displayed measurements at the bottom of the screen are the RMS voltage of the channel 1

signal (yellow) and its frequency. The frequency of the channel 2 signal is displayed in blue.

The two frequency measurements show that these sine waves differ by 12 Hz in frequency. This would

be hard to discern at this level by making measurements on the screen.

These measurements were taken with a B&K 2542B scope. This scope also has a hardware counter

that will display the frequency of the trigger signal to five significant figures. This hardware counter

has substantially higher resolution than the 0.5% resolution of the frequency measurement displayed

on the screen in Figure 30.

Reference waveform

The reference waveform feature allows a signal to be recorded and stored as a reference waveform.

This allows the reference waveform to be recalled later so that another waveform can be compared to

it. An example of the use of a reference waveform would be in a manufacturing environment. The

oscilloscope is used to measure the response of a circuit to a test signal. The scope could measure and

store the response of a "gold standard" circuit. Then the manufactured circuits could have their

response to the test signal compared to the gold standard circuit. The manufacturing person could e.g.

accept or reject the circuit or use the reference waveform to adjust the circuit's response to look like the

reference waveform.

An example of a reference waveform is shown in the following picture:

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