R&S ZVA24, Руководство по обслуживанию

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R&S ZVA Repairs
1177.5333.02 3.13 E-11
Converter80
The converter Unit contains a generator and a reflectometer section for the frequency range 50 GHz to
80 GHz. The generator path contains multipliers (x6) and an amplifier. The reflectometer section
contains a coupler to separate the signal going to the DUT (Ref) from the signal coming from the DUT
(Meas) and two mixers to convert the Ref and Meas signals to an IF signal (279 MHz). The mixers are
used as harmonic mixers (n=8). The IF signals are amplified and then fed to the Base Unit (port3 or
port4). The LO signal (6.25 GHz to10 GHz) for the mixers comes from the generator output of port3 or
port4 on the Base Unit.
Diplexer110
Combiner Unit
In the Combiner Unit the generator signals from the ZVA67 (10 MHz to 67 GHz) and from the
Reflectometer Unit (67 GHz to 110 GHz) are combined and the reflected or transmitted signals from the
DUT are splitted to a Coupler for the frequency range 10 MHz to 67 GHz and to the Converter Unit
(frequency range 67 GHz to 110 GHz). The Coupler separates the signal going to the DUT (Ref) from
the signal coming from the DUT (Meas). This two signals are directly fed to the ZVA67 (port1 or port2).
Switch
The generator signal coming from the ZVA67 is switched to the Coupler (frequency range 10 MHz to 67
GHz) or to the Converter Unit (frequency range 67 GHz to 110 GHz).
Converter110
The converter Unit contains a generator and a reflectometer section for the frequency range 67 GHz to
110 GHz. The generator path contains multipliers (x6) and an amplifier. The reflectometer section
contains a coupler to separate the signal going to the DUT (Ref) from the signal coming from the DUT
(Meas) and two mixers to convert the Ref and Meas signals to an IF signal (279 MHz). The mixers are
used as harmonic mixers (n=8). The IF signals are amplified and then fed to the ZVA67 (port3 or port4).
The LO signal (8.3 GHz to13.8 GHz) for the mixers comes from the generator output of port4 on the
ZVA67.
Converter ZVA-Z75 to ZVA-Z500
The converter units contain a generator and a reflectometer section. The generator path contains
amplifiers and multipliers. The reflectometer section contains a coupler to separate the signal going to
the DUT (Ref) from the signal coming from the DUT (Meas) and two mixers to convert the Ref and
Meas signals to an IF signal (f < 500 MHz). The mixers are used as harmonic mixers. The IF signals
are amplified and then fed to the ZVAxx. The LO signal for the mixers comes from port3 or port4 on the
ZVAxx.