Technical data

Testing Performance 2
7000 Series Oscilloscopes Service Guide 45
4 Make the measurement.
a Set oscilloscope horizontal sweep speed control to
1ms/div.
b Set horizontal position control to +1 ms (rotate control
CCW).
c Set the oscilloscope horizontal sweep speed control to
5ns/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 Use the following formula to calculate the test limits.
TSA Limit: ± (15 + 2 * YrsSinceMfr) ppm
g Record the result and compare it to the limits in the
Performance Test Record (see page 57).
Date Code:
0747
07 = Year
47 = Week
7000 service guide.book Page 45 Thursday, October 16, 2008 12:18 PM