g. Set the horizontal position to 1 ms. Close the Horizontal system menu.
h. Click or tap the trigger information label at the top of the screen. Set the trigger
level to 0 V.
4. Click or tap
> Cursor. The "Result" list window is displayed at the right section
of the screen. Click or tap the result list window, select Setting. Under the Mode
menu item, select "Manual" to enable the manual mode of cursor measurement.
Measure the offset (ΔT) of the middle point of the signal (namely the crossing
point of the rising edge of the current signal and the trigger level line) relative to
the screen center using manual cursor measurement and record the measurement
result.
5. Calculate the timebase accuracy; namely the ratio of ΔT to the horizontal position
of the oscilloscope. For example, if the offset measured is 1 ns, then the timebase
accuracy is 1 ns/1 ms=1 ppm.
6. Calculate the timebase accuracy limit by using the formula ±(0.5 ppm + 1 ppm/
year × Number of Years that the Instrument Has Been Used).
5.5.4
Test Record Form
Timebase Accuracy
[1]
Limit: ±(0.5 ppm + 1 ppm
[2]
/year × Number of Years that
the Instrument Has Been Used
[3]
)
Channel
Test Result ΔT
Calculation Result
[4]
Limit
Pass/Fail
CH1
NOTE
[1]: Typical.
[2]: Clock Drift.
[3]: For the number of years that the instrument has been used, please calculate according to
the date in the verification certificate provided when the instrument leaves factory.
[4]: Calculation Result = Test Result ΔT/1 ms.
5.6
Random Noise Test
This test checks the random noise for each channel at the normal sampling mode.
Performance Verification Test
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DS70000 Performance Verification
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