Agilent Technologies HP 54601B Guía de usuario descargar pdf (Pagina 67)

In order to maximize the vertical accuracy, the upper limit line should be

located approximately one division below the top of the screen. Similarly, the

lower limit should be located approximately one division above the bottom of

the screen.

Example The following example creates a mask to test a 5 volt signal with an upper

limit of 5.2 volts, and a lower limit of 4.8 volts.

1 Set the vertical sensitivity.

In this case, the difference between the upper and lower limit is 0.4 volts.

Separation between the upper and lower limit is six divisions. Therefore, the

sensitivity of the oscilloscope is set to 67 mV/div (0.4 volts / 6 divisions).

2 Set the vertical position.

The center of the screen is at 5 volts ((5.2 + 4.8) volts / 2). So, the position

setting for this test is −5 volts.

3 Create the mask.

Use the cursor readout of the voltage and the line drawing capabilities of the

mask editor to draw two lines: one at 5.2 volts and the other at 4.8 volts.

DC voltage testing hint

When testing a DC voltage using a mask, be aware of the probe that you are

using. Remember to have the probe factor in the scope set up correctly. Also,

when a x1 probe is used for volts/div less than 200 mV/div, the maximum offset

is only 2 volts. A x10 probe is recommended for testing. This probe can give

you at least 20 volts offset even in the most sensitive setting.

Solutions

Creating a DC voltage testing mask

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Agilent Technologies HP 54601B Guía de usuario Pagina 67