Tektronix TLA7XM, Руководство пользователя

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Performance Verification Procedures
4- 8
TLA721 Benchtop & TLA7XM Expansion Mainframe Service Manual
The following procedure checks the accuracy of the 10 MHz system clock. This
procedure is only required on the benchtop mainframe; it is not required for the
expansion mainframe.
Equipment
required Frequency counter (item 3)
SMB-to-BNC cable (item 8)
Prerequisites Warm-up time: 30 minutes
Power-up, mainframe, and CheckIt diagnostics pass
1.
Verify that all of the prerequisites above are met for the procedure.
2.
Connect the frequency counter to the External Signal Out TTL SMB
connector on the benchtop mainframe controller.
3.
Go to the System window and select System Configuration from the System
menu.
4.
In the System Configuration dialog box, select 10 MHz Clock from the list
of routable signals in the External Signal Out selection box and click OK.
5.
Verify that the output frequency at the External Signal Out TTL connector is
10 MHz
±
1 kHz. Record the measurement on a copy of the calibration data
report and disconnect the frequency counter.
6.
In the System Configuration dialog box, reset the External Signal Out signal
to None.
Checking the 10 MHz
System Clock (CLK10)