Minebea CSA-507C, Instruction Manual

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15
5 − 3. Zero adjustment by external resistance.
5 − 3 − 1. Installation of external resistance
Zero adjustment range of the instrument is
±
0.25 mV/V(
±
500
×
10
− 6
st) with the input
conversion.
Therefore, when the initial value is exceeding the range, the instrument will not be adjusted. In
this case, connect the resistance Rz on the terminals No.1 shown as below, and cancel the
portion of the initial load.
Moreover, since the resistance applied will produce effects on accuracy directly, we recommend
the type that specifies 50 ppm/
℃
or better for temperature coefficient in resistance.
In case of applications in the circumstance of large temperature variations, effects on accuracy
by temperature will decrease if more excellent type of temperature coefficient in resistance
value is prepared. The list of resistance value for compensation corresponding to INPUT
conversion strain is as follows
：
However, these resistance values are theoretical ones, so there may cause errors due to
variations of input/output resistance for the strain gage applied transducer used actually.
In due course, just think them as an aim.
When the initial load is plus, connect Rz between A and B on the terminals
RED
GRN
WHT
Shield
BLU
Rz
Strain gage
applied transducer
Rz
：
Compensation
resistance