Chapter 3: Testing Performance
To test delta time measurement accuracy
63
Procedure
1
Configure the sine wave source to output a 0 dBm (600 mVpp) sine wave into
50 ohms with a frequency that corresponds to the table below.
2 Press the Default Setup key on the oscilloscope.
3 Set the scope's input impedance to 50 ohms.
4 Set the channel 1 vertical scale to 100 mV/div.
5 Set the scope's horizontal scale to 5 ns/div.
6 If necessary, adjust the trigger level until the oscilloscope triggers without auto-
triggering.
7 Enable waveform averaging, with 16 averages.
8 Set the measurement thresholds for all waveforms to a fixed voltage level of 0
V and +- 20 mV hysteresis.
9 Enable a peak- to- peak voltage measurement on channel 1.
10 Connect the sine wave source through the appropriate band- pass filter to the
oscilloscope's channel 1 input, as shown in the diagram above. The appropriate
band- pass filter can be found from the table below for each scope model.
11 Adjust the sine wave amplitude until the peak- to- peak voltage of the displayed
channel 1 waveform equals 500 mV +- 5 mV. Press
Clear Display after each
adjustment to clear accumulated averages.
12 Turn off the peak- to- peak voltage measurement.
13 Set the number of waveform averages to 256.
14 Set the acquisition memory depth to 65536 points.
15 On the oscilloscope, press Stop.
16 Press Clear Display.
17 Press Run, wait until 256 averages have accumulated, and then press Stop.
18 Enable jitter mode.
19 Enable period measurements on channel 1 using rising edges.
20 Record the minimum, maximum, and standard deviation values for the period
measurement on channel 1. Compare these values to the test limits for averaged
mode DTMA shown in the Performance Test Record.
21 Disable waveform averaging.
22 Set the trigger mode to single.
23 Press Clear Display.
24 Press Run.
25 Record the minimum, maximum, and standard deviation values for the period
measurement on channel 1. Compare these values to the test limits for non-
averaged mode DTMA shown in the Performance Test Record.
26 Repeat steps 2 through 25 for channels 2, 3, and 4.
Oscilloscope Model Sine Wave Frequency
8104 501 MHz
8064 301 MHz
Oscilloscope Model Band-pass Filter Center Frequency
8104 500 MHz
8064 300 MHz
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