Rohde & Schwarz ZVB 4 - Page 144

Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.76 E-4
Frequency Level Output level MEAS Output level REF
300 kHz 0 dBm -18 dBm -32 dBm
50 MHz 0 dBm -18 dBm -32 dBm
1 GHz 0 dBm -18 dBm -32 dBm
3 GHz 0 dBm -18 dBm -32 dBm
6 GHz 0 dBm -18 dBm -32 dBm
8 GHz 0 dBm -18 dBm -32 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 2 dB below the levels in the table, the board must be replaced.
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 7 mm spanner
 Connect the bridge input (connector. W514) to a functioning port using the R&S SMA cable and
R&S SMA-N adapter.
 Screw a SHORT from the N calibration kit to the port connector.
 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 Output level MEAS Output level REF
300 kHz 8 dBm -18 dBm -32 dBm
50 MHz 8 dBm -18 dBm -32 dBm
1 GHz 8 dBm -18 dBm -32 dBm
3 GHz 8 dBm -18 dBm -32 dBm
6 GHz 8 dBm -18 dBm -32 dBm
8 GHz 8 dBm -18 dBm -32 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 2 dB below the levels given in the table, the board must be
replaced.