Mianyang Weibo Electronics Co.,Limited
No.7 Road 2 of Xianren Road Youxian District Mianyang City P.R. China
Tel: 86-816-2971265 Fax: 86-816-2281934
5
5
c)
Measuring voltage ≤ 600V, uses terminal 3 and 1;
d)
Measuring voltage
＞
600V, uses terminal 3 and 4;
3.
basic testing method for accuracy
(1) According to the terminal definition table to connect the testing circuit;
(2) The testing must to be done by under the following conditions
；
Auxiliary power:
24V
±
1
％，
ripple
≤
5mV
Ambient temperature:
25
℃±
2
℃
Relative humidity
: RH(45
～
75)
％
Accuracy for Signal Power Source instrument:
0.05
(3) warming up the transducer for 3 minutes
(1) Using output monitoring meter V1 to measuring the output of signal power
source instrument, set any input value which is within the measuring range of
the transducer Ir. (e.g. if input value is 100V, the output is 4-20Ma, the
expected output value Iz should be calculated as:
Iz = (20mA
－
4mA
）×
Ur/100V
＋
4mA
(2) Using output monitoring meter V2 to measuring the output voltage V0 of the
transducer, the basic introduced error
γ
of the transducer should be calculated
as:
γ= (Vo－Iz×250Ω)/[(20mA－4mA)×250Ω]×100
(4)
Repeating (4) (5), if calculated absolute value is less than the given accuracy
value of the transducer, it shows the transducer’s accurate grade is qualified.
Caution:
Caution:
Caution:
Caution:
Iz
GND
+
Auxiliary
Power
3
250Ω
10
11
+
+
8
1
V
2
-
V
1
7
-
Signal
Power
Source
GND1
Transducer
