SIGLENT
SDS1000CML/CNL/DL Service Manual 23
To verify Time Base Accuracy
This test checks the time base accuracy of one channel. In the test, both the
impedance of FLUKE and the oscilloscope are required to set to 50Ω. It is
convenient for FLUKE by easy operation on the front panel. But for SDS1000L
oscilloscope, you need to add a 50Ω feedthrough terminator at the end of spec
head of FLUKE.
Time Base Accuracy: Freq/10M < 50ppm
Steps: 1. Connect selected channel of the oscilloscope to the Sine Wave
Generator of FLUKE 9500B.
2. Set the frequency of the Sine Wave Generator to 10MHz.
3. Set the oscilloscope Volts/Div to 500mv/div.
4. Set the oscilloscope Sec/Div to 1ms/div.
5. Press MEASURE button on the front panel of the oscilloscope to
display Freq measurement.
6. Calculate Freq/10M to see if the value is within the range of 50ppm,
which means correct time base accuracy.
7. Disconnect the test connection.
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