Sonic Alert Digital Program Controller DCP301 - Manual (Page 165)

Chapter 11. CALIBRATION
This chapter covers the field calibrations procedures for the inputs, outputs and various functions of the DCP301 and
DCP302 controller after shipment from the factory. When calibration is made in the field, the original factory data is
erased, and so the specified input/output accuracies of the controller cannot be assured. This manual is for users who
are conversant with DCP301 and DCP302 use and operation.
■ Precautions before calibration
Apply power and allow the controller to warm up for 2 hours before you calibrate the
DCP301 and DCP302. Confirm that the test equipment needed for calibration has stabi-
lized.
Factory calibration has been made at a stable temperature of 23.0
°
C (±2
°
C). Calibrate
the DCP301 and DCP302 in this range, and where there are no significant fluctuations in
air temperature.
If calibration equipment of a lower grade than specified below is used, calibration
results may be unsatisfactory.
■ Equipment needed
(1) Standard input source with ±0.02% accuracy (having more than 5 effective digits
and capable of generating both voltage and current outputs)
(2) Decade resistance box with ±0.02% accuracy (having a range of 10 to 500
Ω
with a
resolution of more than 0.01
Ω
)
(3) Digital ammeter with ±0.02% accuracy (measurable in the range of 4 to 20mA with
assured resolution of more than 0.01mA)
(4) Thermometer with ±0.1
°
C accuracy (resolution of more than 0.1
°
C)
11-1