Keysight Technologies InfiniiVision 2000, Service Manual

Page: 46 / 86

46 2000/3000 X-Series Oscilloscopes Service Guide
2
Testing Performance
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 base 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 Use the following formula to calculate the test limits.
Time base accuracy limit: ±25 ppm ±5 ppm per year (aging)
g Record the result and compare it to the limits in the Performance Test
Record (see page 53 ).
Date Code:
0747
07 = Year
47 = Week