Performance Veri
fi
cation
Check Sample Rate and
Delay Time Accuracy
This test checks the 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 procedure.
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 the
Termination
to
50
Ω
.
5.
If it is adjustable, set the time mark amplitude to approximately
1 V
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 Vertical
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 delay to exactly
80 ms
.
MSO4000B and DPO4000B Series Speci
fi
cations and Performance Veri
fi
cation
71