Keysight Technologies InfiniVision 6000L Series, Service Manual

Page: 38 / 100

38 6000L Series Oscilloscopes Service Guide
2
Testing Performance
3 Set up the oscilloscope:
a Press AutoScale.
b Set the oscilloscope Channel 1 vertical sensitivity to 200 mv/div.
c Set the oscilloscope horizontal sweep speed control to 5 ns/div.
d Adjust the intensity to get a sharp, clear trace.
e Adjust the oscilloscope’s trigger level so that the rising edge of the
waveform at the center of the screen is located where the center horizontal
and vertical grid lines cross (center screen).
f Ensure the horizontal position control is set to 0.0 seconds.
4 Make the measurement.
a Set oscilloscope horizontal sweep speed control to 1 ms/div.
b Set horizontal position control to +1 ms (rotate control CCW).
c Set the oscilloscope horizontal sweep speed control to 5 ns/div.
d Record the number of nanoseconds from where the rising edge crosses the
center horizontal grid line to the center vertical grid line. The number of
nanoseconds is equivalent to the time scale error in ppm.
e Use the date code on the oscilloscope’s serial tag to calculate the number of
years since manufacture. Include any fractional portion of a year.
f Calculate the test limits using the following formula:
TSA Limit: ± (15 + 2 * YrsSinceMfr) ppm
g Record the result and compare it to the limits in the Performance Test
Record (see page 46 ).
Date Code:
0747
07 = Year
47 = Week