R&S ZVA8, Service Manual

Page: 403 / 606

R&S ZVA Repairs
1177.5333.02 3.95 E-11
Testing the frequency reference board
(see Test Equipment )

Remove the board from the instrument.

Reinsert board and extension card.

Connect the output to be tested to the spectrum analyzer using an adapter cable and
adapter SMA-N.

Set the frequencies listed in the table.

Check signals according to following table.
Signal Connector Frequency Nom. level Setting
NA1_AD_CLK X103 80 MHz 10 dBm ±1dB
NA2_AD_CLK X104 80 MHz 10 dBm ±1dB
SY1_REF X105 128 MHz 10 dBm ±1dB
SY2_REF X106 128 MHz 10 dBm ±1dB
REF_10_OUTIN X107 10 MHz 6 dBm ±1dB Menu/System/Internal
Reference
The board must be replaced if the signal is more than 2 dB below the stated nominal level.

Connect the frequency reference output of the spectrum analyzer to X107 (REF_10_OUTIN) using
an adapter cable and adapter SMA-N.

Connect X105 or X106 (SY1_REF or. SY2_REF) to the spectrum analyzer using an adapter cable
and adapter SMA-N.

The 128 MHz signal
’s frequency must precisely equal its nominal frequency.
If the frequency differs in any way (e.g. 128.001 MHz), replace the board.