Preparing for Use
R&S
®
EVSF1000
19
Getting Started 1178.6404.02 ─ 05
4.5.1
Connecting the R&S
EVSF1000 to an External DC Power
Source
You can connect the R&S
EVSF1000 to an external DC power source, such as
the board power of the flight inspection plane or the drone. The power supply
must provide a voltage of 11
V
DC to 32
V
DC.
The R&S
EVSF1000 is inline with DO-160G, section
16, category
A. For a mini-
mum input of 20
V
DC, the R&S
EVSF1000 sustains a 200
ms DC power inter-
ruption without rebooting.
If the external power supply unit supplies safety extra-low DC voltage (SELV) to
the instrument, be sure to meet the requirements for reinforced/double insulation
in accordance with DIN/EN/IEC 61010 (UL 3111, CSA C22.2 No. 1010.1) or
DIN/EN/IEC 60950 (UL 1950, CSA C22.2 No. 950). Provide current limitation in
accordance with DIN EN 61010-1 appendix F2.1.
Connect the R&S
EVSF1000 to an external DC power source as follows:
1. Connect a 3-pin XLR connection cable to the Power supply connector on the
back of the instrument (see
2. Insert a 3 AT fuse to protect the connection between the instrument and the
external DC power source against excessive current. A short-circuit can dam-
age the instrument or power supply unit.
3. Connect the XLR connection cable to the DC power supply.
If you have to extend the cable, ensure that the entire cable has a cross-sec-
tion of at least 1.5
mm
2
.
The R&S
EVSF1000 does not have a power (On/Off) switch. When you apply
board power, 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.
► To disconnect the R&S
EVSF1000 from power, disconnect the XLR connec-
tion cable from the DC power supply.
Connecting to Power
