User manual - DATA RECORDER SRD-99 and cooperating software
”Upper ext.”
”Lower ext.”
- parameter defining the allowable range of input currents
If the input current lies within the defined range then the appropriate
measurement result shall be displayed despite exceeding the nominal
measurement value 0-20 mA or 4-20 mA. If the input current exceeds the
range defined by
“Upper extension”, “Lower extension”,
a "-
Hi
-" or "-
Lo
-"
message (depending on the direction of exceeding the range) shall be
displayed instead of the measurement result in numeric form. The
“Upper
extension”
and
“Lower extension”
values are defined in mA with the
accuracy of 0.01 mA. The
“Lower extension”
value is defined in relation to
a 4 mA current, in the range of 0-3.99 mA (this parameter is significant only
in the "4-20 mA" mode). The
“Upper extension”
value is defined in relation
to a 20 mA current in the range of 0-1.99 mA.
Fig. 7.22. Defining permissible measurement range for an example of settings of
“Upper ext.”
and
“Lower ext.”
parameters (for user range 4-20 mA)
7.4.7.
”Input settings” menu (
U version
)
”Unit”
- 4-character sequence constituting the unit for the value measured on the given
channel.
Fig. 7.23.
”Inputs settings”
(part 1)
”Input type”
- type of input/sensor. The following options are available:
”inactive”
- input is not active
”0-5 V”
,
”1-5 V”;
- current inputs, displayed value is defined by “
Hi value
”,
”0-10 V”
,
”2-10 V”
“
Lo value
” and "
Dec. point
" parameters.
51
user defined range (4-20 mA)
permissible measurement range
”
Lower ext.
” = 3mA
”Upper ext.”
= 1 mA
measurement result is displayed
regardless on nominal range exceeding
display
message ”-Lo-”
4
display
message ”-Hi-”
1
0
20
21
22
