Agilent Technologies DSO-X 4022A, Руководство пользователя

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340 Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
20
Utility Settings
• Synchronize the timebase of two or more instruments.
Sample clock and
frequency
counter accuracy
The oscilloscope's timebase uses a built- in reference that has an accuracy
of 15 ppm. This is sufficient for most uses. However, if you are looking at
a window that is very narrow compared to the selected delay (for
example, looking at a 15 ns pulse with the delay set to 1 ms), significant
error can be introduced.
Using the built- in sample clock, the oscilloscope's hardware frequency
counter is a 5- digit counter.
See "To supply a sample clock to the oscilloscope" on page 340.
Supplying an
external timebase
reference
When you supply an external timebase reference, the hardware frequency
counter is automatically changed to an 8- digit counter. In this case, the
frequency counter (
[Meas] > Select > Counter ) is as accurate as the external
clock.
See "To synchronize the timebase of two or more instruments" on
page 341.
For more information on the hardware frequency counter, see
"Counter" on page 257.
To supply a sample clock to the oscilloscope
1
Connect a 10 MHz square or sine wave to the BNC connector labeled
10 MHz REF . The amplitude must be from - 5 dBm to 17 dBm
(356 mVpp to 4.48 Vpp).
2
Press
[Utility] > Options > Rear Panel > Ref Signal
.
3
Use the Entry knob and the
Ref Signal
softkey to select
10 MHz input
.
A locked padlock icon appears at the top of the display.
C A U T I O N
Maximum input voltage at 10 MHz REF connector
Do not apply more than 20 dBm Max (6.32 Vpp Max) at the 10 MHz REF BNC connector
on the rear panel or damage to the instrument may occur.