Agilent Technologies 2000 X-Series Service Manual page 56

2 Testing Performance
56
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 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
2000/3000 X-Series Oscilloscopes Service Guide
Date Code:
0747
07 = Year
47 = Week
63).