Rohde & Schwarz ZVB 4 - Page 148

Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.80 E-4
Frequency Level Output level MEAS Output level REF
10 MHz 0 dBm
-50 dBm ± 3 dB -47 dBm ± 3 dB
100 MHz 0 dBm
-35 dBm ± 3 dB -32 dBm ± 3 dB
1 GHz 0 dBm
-15 dBm ± 3 dB -11 dBm ± 3 dB
2 GHz 0 dBm
-10 dBm ± 3 dB -4.7 dBm ± 3 dB
8 GHz 0 dBm
-10 dBm ± 3 dB -3.7 dBm ± 3 dB
12 GHz 0 dBm
-10 dBm ± 3 dB -3 dBm ± 3 dB
16 GHz 0 dBm
-12 dBm ± 4 dB -2.3 dBm ± 4 dB
20 GHz 0 dBm
-12 dBm ± 4 dB -1.7 dBm ± 4 dB
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 coupler unit must be
replaced.
Method 2:
The receiver section of the associated reflectometer is OK.
 Loosen cable W514 (GEN -> coupler unit) at both ends and screw off at the coupler unit.
 Connect the coupler input (connector. W514) to a functioning port using the SMA cable.
 Screw a SHORT from the 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 coupler unit (port).
Frequency Level Output level MEAS Output level REF
10 MHz 0 dBm
-53 dBm ± 3 dB -50 dBm ± 3 dB
100 MHz 0 dBm
-38 dBm ± 3 dB -35 dBm ± 3 dB
1 GHz 0 dBm
-18.2 dBm ± 3 dB -15 dBm ± 3 dB
2 GHz 0 dBm
-13.3 dBm ± 3 dB -8 dBm ± 3 dB
8 GHz 0 dBm
-14.3 dBm ± 3 dB -8 dBm ± 3 dB
12 GHz 0 dBm
-15 dBm ± 3 dB -3 dBm ± 3 dB
16 GHz 0 dBm
-17.7 dBm ± 4 dB -8 dBm ± 4 dB
20 GHz 0 dBm
-18.3 dBm ± 4 dB -8 dBm ± 4 dB
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 coupler unit must be
replaced.