Minebea CSA-521, Инструкция по эксплуатации

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10
4
−
3. Zero adjustment by mounting resistance
4
−
3
−
1. Mounting the resistance
The zero point adjustable range of this transmitter is 0.25 mV/V(
±
500
μ
st) or equivalent at
the input conversion. Therefore, when an initial load exceeds this range, it is not possible to
adjust it by this unit. In this case, mount resistance Rz on R22 (When an initial load is a plus) or
R23 (When an initial load is a minus), and cancel an initial load as shown in the figure below.
Moreover, because the resistance used exerts the influence directly on accuracy, resistance
temperature coefficient less than 50 ppm/
℃
is recommended. If the one with more excellent
resistance temperature coefficient is used, the influence on accuracy by the temperature
becomes small when used in the environment with a large temperature change.
The example of resistance for compensation corresponding to the input conversion strain is
shown on the next page. However, the error is actually caused with the rose etc. of the I/O
resistance of an actual strain gage applied transducer because this resistance is a theoretical
value. Please think the standard to the end.
R22(Unmounting)
R22
When the initial load is in plus
Rz is mounted on R22 on the P.C.board.
Rz
When the initial load is in minus
Rz is mounted on R23 on the P.C.board.
R23(Unmounting)
R23
Rz