Performance Verification
Check Sample Rate and
Delay Time Accuracy
This test check
s t he sample rate and delay time accuracy (time base).
1. Connect the output of a time mark generator to the oscilloscope channel
1 input using a 50 Ω cable, as shown in the following illustration.
WARNING. The generator is capable of providing dangerous voltages. Be sure to
set the generator to off or 0 volts before connecting, disconnecting, and/or moving
the test hookup during the performance of this pro cedure.
2. Set the time mark generator period to 80 ms. Use a time mark waveform
with a fast rising edge.
3. Push the front-panel Default Setup button.
4. Set the impedance to 50 Ω as follows:
a. Push the front-panel channel 1 button.
b. Set t he Termination to 50 Ω.
5. If it is adjustable, set the time mark amplitude to approximately 1V
p-p
.
6. Set the Vertical Scale to 500 mV per division.
7. Set the Horizontal Scale to 20 ms per division.
8. Adjust the Ver tical Position knob to center the time mark signal on the screen.
9. Adjust the Trigger Level as necessary for a triggered display.
10. Adjust the Horizontal Position to move the trigger location to the center of
the screen (50%).
11. Set the delay to 80 ms as follows:
a. Push the front-panel Acquire button.
b. Push the lower-bezel Delay button to turn delay on (if it is not already on).
c. Turn the Horizontal Position knob clockwise to set the de l ay to exactly
80 ms.
MSO4000B and DPO4000B Series Specifications and Performance Verification 71
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