10. Click in one of the Math <1–4> n = entry boxes, and then set the number of averages using the multipurpose knobs or pop-
up keypad. This number of averages affect math waveforms if the Avg() function is used.
11. Once you have defined the math expression, click Apply in the Math Setup or Math Equation Editor windows.
Using mask and limit testing
Set up mask testing
Use the following procedure to set up the instrument to perform mask testing.
1. Connect the instrument to the source signal or save the source signal to a math or reference waveform memory location.
2. Access the mask setup window:
a. From the toolbar, click Masks to display the Mask Testing control window.
b. From the Source/Tolerance tab select the channel, math, or reference tab, and then select the waveform to use as the
mask test source. You can only mask test one waveform at a time.
3. Specify the mask Type:
a. Open the Masks tab.
b. Click the appropriate button in the Type field.
c. Click the More button to display further selections.
NOTE. This window lists the mask types and standards available on your instrument. Industry standard masks are
available. You must install the Serial Communications Mask Testing Option on some instruments before you can
access the Comm triggers.
TIP. Selecting a mask type and standard adjusts the instrument horizontal, vertical, and trigger settings to those
appropriate for displaying a waveform of the specified type. If the signal is not found within the mask, do the following:
â–
Click the Autoset button to center the waveform in the mask.
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If Autoset did not align the signal within the mask, adjust the instrument vertical and horizontal controls.
â–
If you clicked the Autoset button and the Autoset Undo preference is On, the instrument will display an Autoset Undo
window. Click the Undo button to return to the previous settings, or click the X icon to remove the window.
4. Select a standard from the drop-down list to specify the mask standard.
5. Specify the display parameters:
a. In the Masks tab, click the Display button to toggle mask display on or off. The mask must be turned on to do mask
testing.
b. Click the Hit Count button to turn on or off hit counting. The hit count is shown in the Pass/Fail Results tab.
c. Click the Display Config button to set mask hit highlighting and to lock the mask to the waveform. Lock Mask to Wfm
(Waveform) resizes the mask to reflect changes in the horizontal or vertical settings of the instrument.
6. Autoset the signal:
How to ?
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 603
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