Keysight 9000 Series Service Manual page 44

Chapter 3: Testing Performance
Time Scale Accuracy (TSA)
Procedure, 9000H Series
1 Set up the signal generator.
a Set the output to 10 MHz, approximately 1 V
2 Connect the output of the signal generator to oscilloscope channel 1 using the BNC cable.
3 Set up the oscilloscope:
a Press [AutoScale].
b Set the oscilloscope Channel 1 vertical scale to 200 mv/div.
c Set the oscilloscope horizontal scale 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 horizontal position control to +1 ms (rotate control CCW).
b 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.
TSA = ±(0.4 + 0.5(Years Since Factory Calibration)) ppm peak
c Record the result and compare it to the limits in the Performance Test Record.
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sine wave.
pp