User manual - METER SRP-946
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, converted over selected characteristic,
are displayed on the LED display. The measurement range equal to the nominal range is
called:
nominal measurement range,
and the measurement range equal to the extended
nominal range is called:
permissible measurement range
(Figure 6.1, 6.2).
Figure 6.1. Definitions of measurement ranges in mode 4 ÷ 20mA
If the result of measurement exceeds the
permissible measurement range
, warning
”-Hi-”
or
”-Lo-”
is displayed rather than input signal,
depends on exceeded value (see description of
“Lo r”
and
“Hi r”
parameters, paragraph
”inPt” menu
).
Figure 6.2. Definitions of measurement ranges in mode 0 ÷ 20mA
If the measurement value does not exceed
permissible measurement range
but
displayed value exceeds range -99999 ÷ 999999, the warning ”-Ov-” is displayed
rather than the calculated result.
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
).
19
”
Lo r
” parameter
”
Hi r
” parameter
4 mA
20 mA
permissible measurement range
nominal measurement range
”
Hi r
” parameter
0 mA
20 mA
permissible measurement range
nominal measurement range
i
