Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9750-22 3U Electronic Load 0 - 22 A 0 - 750 V/DC 0 - 3500 W 33200404 Data Sheet
Product codes
33200404
Page 67
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
ELR 9000 Series
► How to save a sequence table (100 sequences) to a USB flash drive:
1.
Do not plug the USB flash drive yet or remove it.
2.
Access the function selection menu of the function generator via MENU -> Function Generator -> Arbitrary
3.
Tap on
, then
. The device will request you to plug the USB flash drive now.
4.
After plugging it, the device will try to access the flash drive and find the folder HMI_FILES and read the
content. If there are already WAVE_U or WAVE_I files present, they will be listed and you can either select
one for overwriting with , otherwise select
one for overwriting with , otherwise select
for a new file.
5.
Finally save the sequence table with
.
3.9.11 Ramp function
The following parameters can be configured for a ramp function.
Value
Range
Description
Ustart / Istart
0...Nominal value of U, I
Start value (U,I)
Uend / Iend
0...Nominal value of U, I
End value (U, I)
t1
0.1 ms...36000 s
Time before ramp-up or ramp-down of the signal.
t2
0.1 ms...36000 s
Ramp-up or ramp-down time
Schematic diagram:
Application and result:
A
.st
ar
t
t
A
t1
t2
A
.E
nd
This function generates a rising or falling ramp between start
and end values over the time t2. Time t1 creates a delay before
the ramp starts.
The function runs once and stops at the end value. The function
The function runs once and stops at the end value. The function
runs once and stops at the end value. To have a repeating ramp,
function Trapezoid would have to be used instead (see 3.9.8).
Important to consider are the static values of U and I which define
Important to consider are the static values of U and I which define
the start levels at the beginning of the ramp. It is recommended
that these values are set equal to those in A.start, unless the
power source shall not be loaed before the start of the ramp. In
that case the static values should be set to zero.
10h after reaching the ramp end, the function
will stop automatically (i.e. I = 0 A, in case the
ramp was assigned to the current), unless it
has been stopped manually before.
3.9.12 UI and IU table functions (XY table)
The UI and IU functions offer the user the possibility to set a DC input current dependant on the DC input voltage,
or a DC input voltage dependant on the DC input current. The function is table driven with exactly 4096 values,
which are distributed over the whole measured range of actual input voltage or input current in the range of 0...125%
Unom or Inom. The table can either be uploaded from a USB flash drive through the front side USB port of the
device or via remote control (ModBus protocol or SCPI). The functions are:
UI function:
UI function:
U = f(I)
IU function:
I = f(U)
In the
UI function, the equipment measuring circuit determines the level from 0 to maximum of the input current.
For each of the 4096 possible values for input current a voltage value is maintained by the user in the UI table
which can be any value between 0 and nominal value. The values uploaded from a USB flash drive will always
be interpreted as voltage values even if the user calculated them as current values and incorrectly loaded them
as a UI table.
In the
In the
IU function the assignment of the values is the other way round, the behaviour, however, the same.
Thus the behaviour of the load or the current and power consumption can be controlled with dependance on input
voltage and step changes can be created.