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Troubleshooting R&S
ZVAX24
1312.7979.82 3.28
E-1
Testing the Pulse Modulator (R&S ZVAX-B271, R&S ZVAX-B272 and R&S ZVAX-
B273)
Disconnect the RF cables W111 and W121 (W210 / W203 and W211 with option R&S ZVAX-B272,
W311 and W321 with option R&S ZVAX-B273) from the pulse modulator.
Set the R&S ZVA to sweep mode 10 MHz to 24 GHz.
Connect two test cables to port 1 and port 2 of the R&S ZVA and perform a full 2-port calibration at
the end of the cables.
Testing the insertion loss (modulator bypassed) X1 to X2:
Connect the test cable from port 1 to the input X1 and the test cable from port 2 to the output X2.
Set the R&S ZVA to Meas S21.
Read transmission S21.
If the S21 values displayed on the R&S ZVA's screen are not within the range 0 dB to -1.5 dB, the
transfer switch must be replaced.
Testing the transmission loss (modulator on):
Connect the test cable from port1 to the input X1 and the test cable from port2 to the output X2.
Set the R&S ZVA to Meas S21.
Read transmission S21.
If the S21 values displayed on the R&S ZVA's screen are not within the range shown in the table below,
the pulse modulator must be replaced.
Frequency range
Transmission loss
10 MHz to 15 GHz
> - 6 dB
15 GHz to 24 GHz
> - 8 dB
Testing the transmission loss (modulator off):
Connect the test cable from port1 to the input X1 and the test cable from port2 to the output X2.
Set the R&S ZVA to Meas S21.
Read transmission S21.
Содержание ZVAX24
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