R&S ZVA8 - Page 412

Repairs R&S ZVA
1177.5333.02 3.104 E-11
Method 2:
The receive section of the associated reflectometer is OK.
 Loosen cable W514 (GEN -> Bridge unit) at both ends and screw off at the bridge unit.
N.B.: When loosening, support the cable with a 7mm spanner
 Connect the bridge input (connector W514) to a functioning port using the SMA cable and SMA-N
adapter.
 Screw the SHORT from a N-calibration kit to the port connector, save measured values (Data ->
Mem).
 Screw the OPEN from the calibration kit to the port connector.
 Select User Def Math : (lin Mag(Data) + (linMag(Mem2)) / 2 , activate Result is Wave Quantity
 Select Math = User Def
 Set the frequencies and levels listed in the table at the port used for the measurement and measure
the level (wave quantity ax or bx) at the reflectometer associated with the bridge unit (port).
Frequency
Level
Level ax and bx
300 kHz
8 dBm
0 dBm
50 MHz
8 dBm
0 dBm
1 GHz
8 dBm
0 dBm
3 GHz
8 dBm
0 dBm
6 GHz
8 dBm
0 dBm
8 GHz
8 dBm
0 dBm
With the stated levels, the cable loss must still be taken into account. For the specified cable it is
0.25 dB/GHz.
If the measured values are more than 3 dB below the levels given in the table, the board must be
replaced.