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Using Area-based Templates for Pass/Fail Limit Waveform Testing

Figure 6. 10ms falling edge becomes the second boundary. Figure 7. Apply the template.

4. On the oscilloscope, press Function and select “Limit

Test”. In the side-bezel menu, select “CH1” as the source.

In the “Template Setup” sub-menu, press Dual Ref so that

the template is based on two waveforms. Then select

“Save First Source” to set the current waveform as the

ﬁrst reference line.

5. Now you need to deﬁne the second boundary of the

tolerance area. Press Output on the power supply to turn

the output on. Change the Slew Fall rate to 310V/s (this

value can be adjusted to meet the 10ms fall time).

6. Press Output on the power supply to close it. The scope

is triggered at another falling edge. Note that the “Fall

Time” is now 10ms (see Figure 6).

7. On the oscilloscope, press Function, and select “Limit

Test”. In the bezel menu, select “CH1” as the source.

In the “Template Setup” sub-menu, press Dual Ref and

select “Save Second Source” to set the 10ms falling edge

as the second boundary.

8. Now you can add vertical and horizontal tolerance to

the area deﬁned by the two boundary lines. On the

oscilloscope, press Back. Press “More”, then select “V

limit”. Rotate the “Multipurpose” knob to set the vertical

tolerance to 200mdiv; select “H limit” and then rotate

the “Multipurpose” knob to set the horizontal tolerance

to 200mdiv. Select “More” and then press Apply Template

to build the template based on the two reference lines

and the speciﬁed vertical and horizontal tolerances

(see Figure 7).

9. Now the template is ready on the oscilloscope as

Reference Waveform A (Ref A). You can save both the

setup ﬁle and the Ref A waveform to a USB drive (by

pressing Save/Recall, selecting “Save setup” in the

“Action” sub-menu, and pressing Save) and share them

with the manufacturing team.

10. The manufacturing engineer can now load the setup

ﬁle and the reference waveform on other TBS1000B

oscilloscopes for use during production.