28 DSOX1204A/G Oscilloscopes Service Guide
2 Testing Performance
To verify time base accuracy
This test verifies the accuracy of the time base.
In this test you will measure the absolute error of the time base oscillator and
compare the results to the specification.
1 Set up the signal generator.
a Set the output to 10 MHz, approximately 1 V
pp
sine wave.
2 Connect the output of the signal generator to oscilloscope channel 1 using the
BNC cable. Also, connect a 50 ohm feedthrough termination between the
channel 1 input and the BNC cable.
Table 8 Time Base Accuracy Test Limits
Models Test Limits
All Models 50 ppm ±5 ppm per year (aging)
Table 9 Equipment Required to Verify Time Base Accuracy
Equipment Critical Specifications Recommended Model/Part
Signal Generator 100 kHz - 200 MHz, 0.01 Hz frequency
resolution,
jitter: < 2ps
Keysight N5181A
Cable BNC, 3 feet Keysight 10503A
50 Ohm Feedthrough
Termination
50
Ω BNC (f) to BNC (m) Keysight 0960-0301
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