R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.79 E-4
Frequency Output level Displayed level
ax or bx
10 MHz -30 dBm
+20 dBm ± 3 dB
100 MHz -30 dBm
+5 dBm ± 3 dB
1 GHz -20 dBm
-5 dBm ± 3 dB
2.5 GHz -20 dBm
-10 dBm ± 3 dB
3 GHz -20 dBm
-10 dBm ± 3 dB
8 GHz -20 dBm
-10 dBm ± 3 dB
9 GHz -20 dBm
-10 dBm ± 3 dB
12 GHz -20 dBm
-10 dBm ± 3 dB
15 GHz -20 dBm
-8 dBm ± 4 dB
18 GHz -20 dBm
-8 dBm ± 4 dB
20 GHz -20 dBm
-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 (0.5 m) or. 0.5 dB/GHz (1 m).
If the measured values are more than 2 dB below the levels list in the table, the board must be
replaced.
Coupler unit levels
The following is assumed:
• One reflectometer in the instrument is OK.
Method 1:
The generator section of the associated reflectometer is OK (output level at the port meets
specifications).
Loosen cable W515 (coupler unit -> MEAS) and cable W518 (coupler unit -> REF) at both ends and
disconnect at the bridge unit.
Connect the coupler unit output (MEAS = connector W515 or REF = connector W518) to a
functioning port using the SMA cable and adapter SMA-N to a functioning port. Terminate the
coüpler unit output that is not used with an SMA termination.
Screw a SHORT from the calibration kit to the port connector.
Set the frequencies and levels listed in the table for the reflectometer associated with the coupler
unit (port) and measure the level (wave quantity bx) at the port used for the measurement.
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