User manual for Digital Indicator and cooperating software
6.
PRINCIPLE OF OPERATION
After turning the power supply on, the logo and basic unit data are showed on the
display, then the unit goes to the measurement mode.
6.1.
MEASUREMENT MODE
In the measurement mode the unit executes the measurement of values of signals
connected to current inputs, hereafter called measurement channels (the number of available
channels depends on the unit version). Measurements are conducted at the frequency of
8 times per second for each channel. The nominal range of input current for each input is
0-20 mA or 4-20 mA and can be extended to the maximum of 0-22 mA, independently to each
measurement channel. The results of the conducted measurements are shown on the LCD
display. The unit computes the measurement results into indicated values proportionally
(linear). The range of measurement results corresponding to the nominal range of input
current is defined as
nominal measurement range
. The range of measurement results
corresponding to the range of input current including the extensions is defined as
allowable
measurement range
*
"Lower ext."
parameter is only significant for an input current range of 4-20 mA.
Fig. 6.1. Definition of measurement ranges
The range of displayed values, unit of measured value and position of the decimal point
(for presentation in numeric form) are defined by the user.
All available parameters of the unit’s operation can be configured in the main menu (see
DEVICE PROGRAMMING
) or using the RS 485 interface and software installed on your PC.
Configuration of the device (via menu or RS 485 interface)
do not stops
measures
.
Results of measurements conducted for active (selected by the user) channels of the unit are
displayed in one of the available result presentation modes (see
RESULT
PRESENTATION
MODES
).
16
i
nominal measurement range
”Hi value”
parameter
”Lo value”
parameter
permissible measurement range
”Lower ext.”
parameter
”Higher ext.”
parameter
