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: ±0.005% of reading ±0.1% of full scale ±20 ps (same channel)
Table 3-8
Equipment Required to Verify Horizontal ∆t and 1/∆t Accuracy
1
Connect the oscilloscope calibrator output to the oscilloscope
channel 1 input. Then, select
Marker on the oscilloscope calibrator and
set the calibrator for 100 µs markers.
2 Set up the oscilloscope.
a Set channel 1 Coupling to DC and Imped to 50 Ohm.
b Press the Display key, then set the Vectors softkey to off.
c Press the Autoscale key.
d Set the time base to 20 µs/div.
e Press the Main/Delayed key, then set the Time Ref softkey to Left.
f 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
service.book Page 15 Wednesday, August 28, 2002 3:25 PM
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