User manual for regulated current source SZP-73
6.
PRINCIPLE OF OPERATION
After turning the power supply on, device ID and software version are showed on the
display, next the controller goes to the
current source mode
. After power on, output current
can get default value (defined by user) or value equal to generated directly before power off
(see
MENU DESCRIPTION
, parameters
“Init”
and
“IvAL”
).
6.1.
CURRENT SOURCE MODE
In this mode chosen output value is presented on the LED display. Pressing the
[ENTER]
button switches between displaying and regulation of direct current value and recalculated
value (scaled to user defined range)
6.1.1.
Regulation and displaying of direct current value
This mode is signalized by flashing decimal point (in orange colour if device is equipped with
two-colour display) of displayed current value.
There are available values in range: 4mA (displayed as 4.00) up to 20mA (displayed as 20.00).
Buttons
[^]
and
[v]
allows changing of present current value. If user presses and holds one of
these buttons current is being changed with increasing speed.
The range of displayed and generated values is
“4.00”
÷
“20.00”
in this mode.
6.1.2.
Regulation and displaying of recalculated value
In this mode displayed value is recalculated to output current value according to
parameters
“OUtL”
and
“OUtH”
(see
OPIS MENU
). Decimal point position can be set to any
decade using parameter
“Pnt”
(see
OPIS MENU
).
•
if displayed value is equal to value of parameter
“OUtL”
- output current is equal 4 mA
•
if displayed value is equal to value of parameter
“OUtH”
- output current is equal 20 mA
•
all values between
“OUtL”
and
“OUtH”
are recalculated to output current according to
formula:
I
out
=
Z
−
" OUtL"
"OUtH"
−
"OUtL"
×
16
mA
4
mA
where
Z
denotes required value.
Buttons
[^]
and
[v]
allow to change of current value (recalculated value in this mode). If user
presses and holds one of these buttons current is being changed with increasing speed.
The range of displayed and generated values is
“OUtL”
÷
“OUtH”
in this mode.
13
i
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