Agilent Technologies 54657A Uživatelská příručka stáhnout pdf (Strana 46)

To create a mask template using Automask

A mask template contains two limit lines: minimum and maximum.

Automask allows you to easily generate a mask with tolerances from a

displayed waveform on the screen.

Connect a known good signal to the oscilloscope.

2 Set up the oscilloscope with the settings that are required to test the

signal.

3 Press

± .

4 Press the Mask Test softkey.

5 Toggle the Use Mask softkey to select the desired mask number

(1 or 2).

6 Press the Define Mask Automask softkey.

7 Press the Tolerance softkey, then turn the knob closest to the

Cursors key to set the tolerance.

Pressing the softkey increases the tolerance value by 0.2%.

Press the Create Mask softkey to create the mask with the specified

tolerance.

Tolerance Operating Hint

The tolerance used in Automask is expressed as a percentage of the full-scale

time and voltage of the lowest number of all active channels. It does not

represent the tolerance of the actual size of the input signal. To specify the

tolerance as a percentage of the actual size of the input signal requires some

additional calculations.

For example, a signal of 1 volt peak-to-peak is tested at a vertical sensitivity of

500 mV/div. The full-scale voltage equals the volts/div times the number of

full-scale divisions (500 mV * 8 = 4 V). To specify a 4% tolerance on a 1 V

peak-to-peak signal requires a 40 mV tolerance, but to specify a 40 mV tolerance

on a full-scale voltage of 4 volts requires a 1% tolerance. Therefore, a 1%

tolerance should be specified to generate the mask template.

Operating the Measurement/Storage Module

To create a mask template using Automask

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Agilent Technologies 54657A Uživatelská příručka Strana 46