R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.69 E-4
Board Test
W
hen boards are being tested, internal sources are used whenever possible. This means that it is
always assumed that the downstream board in the signal path is OK. If a clear fault is not present, the
order of the board tests given below should always be followed.
The inputs and outputs of the boards to be tested can be accessed via cables in the lower section of the
instrument (except the frequency reference board).
Opening the instrument
(See Chapter 5, drawing1145.1010)
Turn off the instrument and disconnect from the mains, screw off the 4 rear-panel feet (460) and
pull off the enclosure (400) backwards.
Remove the instrument base cover (297) after undoing the 12 countersunk screws (299).
Only when testing the frequency reference board:
Lift off the instrument top cover (296) after undoing the 23 (2 ports) or the 28 (4 ports) countersunk
screws (298).
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