Preparing for Use
R&S
®
EVSF1000
20
Getting Started 1178.6404.02 ─ 05
4.5.2
Connecting the R&S
EVSF1000 to AC Power
If you need to operate the R&S
EVSF1000 outside an aircraft, you can use an
AC/DC power supply unit, available as an accessory. When connecting to an AC
power supply, only use the R&S
EVSG1-Z8.
Connect the R&S
EVSF1000 to AC power as follows:
1. Connect the DC connector on the AC/DC power supply unit to the Power Sup-
ply connector on the back of the R&S
EVSF1000 (see
2. Plug the AC power cable into the AC/DC power supply connector. Only use
the AC power cable delivered with the power supply unit.
The required ratings are indicated next to the AC power connector and in the
power supply unit's data sheet.
3. Plug the AC power cable into a two-pin power outlet with ground contact.
The green operating LED of the AC/DC power supply connector lights up.
The R&S
EVSF1000 does not have a power (On/Off) switch. When you apply
voltage to the Power Supply connector, the R&S
EVSF1000 starts immediately.
Disconnecting from power
When you interrupt the supply voltage from a level of 20
V or more, the
R&S
EVSF1000 continues to work for approximately 300
ms. It is powered by
internal backup capacitors, intended to bridge short power failures in an aircraft
installation. During this time, the current measurement settings and the latest
error log data are saved to the internal flash memory.
NOTICE! Risk of losing settings
If the power interruption occurs at a power level under 20
V, the R&S
EVSF1000
does not save the settings.
In particular, if you operate the R&S
EVSF1000 using an AC/DC power supply
and the AC power supply is interrupted, the DC power decreases slowly. In this
case, the R&S
EVSF1000 detects the power failure too late and cannot save the
settings.
To ensure a controlled shutdown:
1. Disconnect the R&S
EVSF1000 from the DC power supply.
Connecting to Power
