R&S ZVA8, Руководство по обслуживанию

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Repairs R&S ZVA
1177.5333.02 3.8 E-11
Range Basic frequency range
from synthesizer
Doubler 1 Frequency Doubler 2 Output frequency
1 10 MHz to 8.0 GHz --- 10 MHz to 8.0 GHz --- 10 MHz to 8.0 GHz
2 4 GHz to 5.05 GHz x 8.0 GHz to 10.1 GHz --- 8.0 GHz to 10.1 GHz
3 5.05 GHz to 6.35 GHz x 10.1 GHz to 12.7 GHz --- 10.1 GHz to 12.7 GHz
4 6.35 GHz to 8.0 GHz x 12.7 GHz to 16.0 GHz --- 12.7 GHz to 16.0 GHz
5 4.0 GHz to 5.0 GHz x 8.0 GHz to 10.0 GHz x 16.0 GHz to 20 GHz
6 5.0 GHz to 6.0 GHz x 10.0 GHz to 12.0 GHz x 20.0 GHz to 24 GHz
Receiver
The receiver section has two channels (measurement channel and reference channel) and uses single
conversion. The measurement channel contains a buffer amplifier, two mixers for each of the frequency
ranges 10 MHz to 2.5 GHz and 2.5 GHz to 24 GHz, LO amplifiers and an IF amplifier. The reference
channel is identical to the measurement channel without the buffer amplifier. In the mixers, the input
signal is directly converted to the IF range, approx. 15 to 21 MHz. The mixers are used as basic wave
mixers.
The LO signal section contains a frequency doubler for the range 8 GHz to 16 GHz, a switchable filter
unit, a second frequency doubler with filter for the range 16 GHz to 24 GHz and a broadband amplifier
for the frequency range 30 MHz to 24 GHz.
Range Basic frequency range
from synthesizer
Doubler 1 Frequency Doubler 2 Output frequency
1 30 MHz to 8.0 GHz --- 30 MHz to 8.0 GHz --- 30 MHz to 8.0 GHz
2 4 GHz to 8.0 GHz x 8.0 GHz to 16.0 GHz --- 8.0 GHz to 16.0 GHz
3 4.0 GHz to 6.0 GHz x 8.0 GHz to 12.0 GHz x 16.0 GHz to 24.0 GHz
Each of the reflectometers contains a voltage-controlled fan to perform optimum cooling.
Reflectometer Unit ZVA40
A reflectometer unit comprising a
coupler , a generator section (Driver24 and Doubler44) and a
receiver section (Receiver44) is incorporated in every port (Port1 to 4). The generator and the
receiver are screwed together to form a compact unit.
Coupler Unit
The coupler contains a bias-T and two directional couplers. One coupler is used to separate the signal
going to the DUT from the signal coming from the DUT. The reference signal (= measure of the signal
to the DUT) is obtained from the second coupler. The reference signal provides a reference for relative
measurements.
Driver24
The driver contains a frequency doubler for the range 8 GHz to 16 GHz, a switchable filter unit, a
second frequency doubler with filter for the range 16 GHz to 24 GHz and a broadband amplifier for the
frequency range 10 MHz to 24 GHz with two adjustable attenuators to keep the output level constant
and to attenuate it electronically.