### Front Panel Connectors

The test ports and various additional connectors are located on the front panel
of the analyzer.

### Test Ports

N-connectors, numbered 1 to 4 (for four-port instruments). The test ports serve as outputs for the RF stimulus signal and as inputs for the measured RF signals from the DUT (response signals).

- With a single test port, it is possible to generate a stimulus signal and measure the response signal in reflection.

- With 2, 3 or 4 test ports, it is possible to perform full two-port, 3-port or 4-port measurements; see S-Parameters
  section.

| Attention! The maximum input levels at all test ports according to the front panel labeling or the data sheet must not be exceeded. In addition, the maximum input voltages of the other input connectors at the front and rear panel must not be exceeded.

The three LEDs above each test port indicate the connector state:

- The amber LED is on while the connector is used as a source port.

- The green LED is on while the connector is used as a bidirectional (source and receive) port.

- The blue LED is on while the connector is used as a receive port.

### USB Connector

Double Universal Serial Bus connector of type A (master USB), used to connect e.g a keyboard, mouse or other pointing devices, the Calibration Unit
(accessory R&S ZV-Z51/-Z52 or R&S ZV-Z58), a printer or an external storage device (USB stick, CD-ROM drive etc.).

The length of passive connecting USB cables should not exceed 1 m. The maximum current per USB port is 500 mA.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
1 | +5.2VD | – | +5.2V | Supply voltage (rt)
2 | USBD0M | B | TTL | Data D– (ws)
3 | USVD0P | B |  | Data D+ (gn)
4 | GNDD | – | 0 V | Digital ground (sw)
5 | +5.2VD | – | +5.2V | Supply voltage (rt)
6 | USBD1M | B | TTL | Data D– (ws)
7 | USBD1P | B |  | Data D+ (gn)
8 | GNDD | – | 0 V | Digital ground (sw)

### Ground Connector

Connector providing the ground of the analyzer's supply voltage.

| Attention! Electrostatic discharge (ESD) may cause damage to the electronic components of the DUT and the analyzer. Use the wrist strap and cord supplied with the instrument to connect yourself to the GND connector.