Anritsu VectorStar MN469 C Series, Руководство по обслуживанию, Страница: 12 / 78

1-6 MN469xC Multiport Test Set Functional Description Chapter 1 — General Information
1-6 PN: 10410-00730 Rev. D MN469xC Series Multiport Test Set MM
The MN469xC test set contains eight SPDT RF switches. Four switches, A4, A5, A6 and A7, operate in low
band frequencies below 2.5 GHz. Four switches, A12, A13, A18 and A19, operate in high band frequencies from
2.5 GHz and beyond.
Any one or two test ports may be selected for forward and/or reverse measurements. There is an LED above
each test port (Ports 3 and 4). When the connection paths are set via GPIB commands, the test port LEDs will
light according to the connections. A lit LED over a test port indicates that it is selected as an active test port.
There is an LED next to the Power switch. When AC power is first applied, the Power LED will light.
Low Band Operation

70 kHz to 2.5 GHz
The A4 Low Band Switch routes the stimulus signal from the VectorStar VNA Low Band Source 2 Output to
either Port 3 through the A20 Port 3 Low Band Bridge, A8 Diplexer/Bias Tee Assembly and then A14 Port 3
Coupler or to Port 4 through the A21 Port 4 Low Band Bridge, A10 Diplexer/Bias Tee Assembly and then A15
Port 4 Coupler.
The A6 Low Band Switch routes the stimulus signal from the VectorStar VNA Low Band Source 1 to either
Port 1 or Port 2 back on the host VNA. It does this by routing back into the source loops so the VNA
bridges/couplers are employed.
The reflected or transmitted signal measured at Port 3 passes directly through the A14 Port 3 Coupler and A8
Diplexer/Bias Tee Assembly, and then is coupled via the A20 Low Band Bridge to the A5 Low Band Switch.
The reflected or transmitted signal measured at Port 4 passes directly through the A15 Port 4 Coupler and A10
Diplexer/Bias Tee Assembly, and then is coupled via the A21 Low Band Bridge to the A5 Low Band Switch.
The A5 Low Band Switch routes the measured reflected or transmitted signal from either Port 3 or Port 4 to
the VectorStar VNA Low Band b2 Input.
Reflected or transmitted signals arriving at ports 1 or 2 are coupled within the host VNA and the b1 or b2
signals are routed to the A7 Low Band Switch where they are multiplexed onto the VNA's b1 input.
High Band Operation

2.5 GHz and beyond
The A12 High Band Switch routes the stimulus signal from the VectorStar VNA Low Band Source 2 Output to
either Port 3 through the A8 Diplexer/Bias Tee Assembly and then A14 Port 3 Coupler or to Port 4 through the
A10 Diplexer/Bias Tee Assembly and then A15 Port 4 Coupler.
The A19 High Band Switch routes the stimulus signal from the VectorStar VNA High Band Source 1 to either
Port 1 or Port 2 back on the host VNA. It does this by routing back into the source loops so the VNA
bridges/couplers are employed.
The reflected or transmitted signal measured at Port 3 is coupled via the A14 Port 3 Coupler to the A13 High
Band Switch.
The reflected or transmitted signal measured at Port 4 is coupled via the A15 Port 4 Coupler to the A13 High
Band Switch.
Reflected or transmitted signals arriving at Ports 1 or 2 are coupled within the host VNA and the b1 or b2
signals are routed to the A13 High Band Switch where they are multiplexed onto the VNA's b1 input..
The A18 High Band Switch routes the measured reflected or transmitted signal from either Port 3 or Port 4 to
the VectorStar VNA High Band b2 Input.