Performance Tests
CSA 803C Service Manual 4Ć23
This procedure verifies the correct operation and accuracy of the
CSA 803A's horizontal referenceclock (see Figure 4Ć2).
This procedure should only be performed if maintenance is required.
This procedure is not necessary for verifying instrument specificaĆ
tions.
Specifications
The operational frequency specification for the horizontal reference clock is
200,000 kHz ±5 kHz.

Setup to Check Horizontal Reference Clock

CSA 803C
10XProbe
ToPin 9
ofU191
A5Time Base/
ControllerBoard
(SeeFigure 4Ć2) ToPin 1
ofU191
Frequency
Counter

Procedure to Check Horizontal Reference Clock

ăStep 1:ăInitialize the CSA 803C settings as follows:
UTILITYbutton press...........................................
Initialize (in major menu) touch..............................
Initialize (in verification popĆup menu) touch..................
ăStep 2:ăPerformthe following operations on the CSA 803C in the order
listed:
Set the front panel ON/STANDBYswitch to STANDBY.
Set the CSA 803C on its right side (as viewed from facing the front
of the CSA 803C).
Set the CSA 803C front panel ON/STANDBYswitch to ON.
HorizontalReference Clock