Status LED

Indicates the instrument status (Figure "Rear view of the R&S SZU", (5)).

Status LED colors

LED

R&S SZU status

Description

off

Off

R&S SZU is powerless.

on

Standby

Controller is running, all analog circuity are powered down.

blinking (3 Hz)

Booting or busy

Controller is booting or USB transfer is running.

on

RF Off

R&S SZU is ready for operation with RF deactivated.

on

RF On

R&S SZU is ready for operation with RF signal activated.

blinking once

Trigger received

LED switches off for 200 µs when an external trigger event occurred.

on

Internal error

E.g., over temperature, power failure, fan failure.

blinking (6Hz)

External error

E.g., LO level out of range.