User manual - METER SRT-457
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 measurement mode.
6.1.
MEASUREMENT MODE
In the measure mode, the measurement results, are displayed on the display. If the result
of measurement exceeds the
permissible measurement range
, warning
-Hi-
or
-Lo-
is
displayed rather than
calculated result
, depends on exceeded value. The warning can be
effect of measurement circuit malfunction. In that case
-Lo-
means shortcut and
-Hi-
means break of measurement circuit.
In the measurement mode user can check main thresholds values. After pressing
[^]
or
[v]
button, name of the threshold (e.g.
rEL1
) and his value will be displayed on the display
in alternating mode. If
[^]
or
[v]
will be pressed in 5 sec again, the next threshold will be
displayed, else the device comes back to the measurement mode. If a
free access
is enabled
(see description of
SECu menu
), user can change the value of particular threshold pressing
button
[ENTER]
(see:
PARAMETERS EDITION
).
All accessible parameters can be changed by entering the menu (see:
DEVICE
PROGRAMMING
). Use the local keyboard or the remote controller to do it. (Note: all
parameters can be remote changed via RS-485 interface).
Configuration of the device (via menu or RS-485 interface)
do not stops measures
.
6.2.
DETECTION OF THE PEAK VALUES
The
SRT-457
controller is equipped with peaks detection function. It can detect a peaks
of the input signal and display their values. Presets connected with this function are placed in
HOLd
menu (see description of
HOLd menu
). The detection of the peak can be done if
the measured signal raises and drops of value at least equal to parameter
PEA
. Detected
peaks are displayed during the time defined by parameter
timE
. If a new peak will be
detected while one is displayed, this new peak will be displayed and display time counter will
be cleared (Figure 6.1). If no peaks are detected while time
timE
elapses
,
device starts to
show the current value of input signal again. If
HdiS
=
HOLD
then setting parameter
"timE"
=
0.0
causes holding peak value until
[ESC]
button is pressed. If
HdiS
=
rEAL
then
value
"timE"
=
0.0
means no holding. Displaying peak value is signalized by flashing most right
decimal point.
The relays/LEDs can be controlled depend on the current value of input signal or the
peak value (see
HOLd menu
).
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