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3-15
Testing Performance
To verify horizontal Dt and 1/Dt accuracy
To verify horizontal ∆t and 1/∆t accuracy
This test verifies the horizontal ∆t and 1/∆t accuracy. In this test, you will use
the oscilloscope to measure the output of a time mark generator.
Test limits: ±0.01% of reading ±0.1% of full scale ±40 ps (same channel)
Table 3-8
Equipment Required to Verify Horizontal ∆t and 1/∆t Accuracy
1
Connect the oscilloscope calibrator to channel 1 using the 50 Ω
feedthrough at the oscilloscope input. Then, select
Marker and set the
calibrator for 100
µs markers.
2 Set up the oscilloscope.
a Press the Display key, then set the Vectors softkey to off.
b Press the Autoscale key.
c Set the time base to 20 µs/div.
d Press the Main/Delayed key, then set the Time Ref softkey to Left.
e Adjust the Trigger Level knob to obtain a stable display.
3
Press the Quick Meas softkey, set the Source softkey to 1, then select and
measure
Frequency and Period. Measure the following:
Frequency 10 kHz — The test limits are 9.98 kHz to 10.02 kHz.
Period 100 µs — The test limits are 99.79 µs to 100.2 µs.
If the measurements are not within the test limits, see the “Troubleshooting”
chapter. Then return here.
Equipment Critical Specifications Recommended Model/Part
Oscilloscope Calibrator Stability 5 ppm after 1/2 hour Fluke 5820A
Cable BNC, 3 feet Agilent 10503A
Feedthrough 50
Ω, BNC connectors (m) and (f) Agilent 11048C
service.book Page 15 Wednesday, December 18, 2002 8:35 AM