Nor-Cal SDC15 Controller - Manual (Page 202)

■ Cautions before starting the calibration
When calibrating the unit, strictly observe the following cautions. Failure to do so
may cause faulty accuracy:
• Before starting the calibration, supply the power to this unit for at least 1 hr.
• The ambient temperature of the calibration place must conform the standard
conditions specified in the unit specifications.
• Do not calibrate the unit in a place where it is in contact with the wind or the
ambient temperature fluctuates.
• Do not calibrate the unit with the measuring instruments having lower
specifications stated in the next section, ■ Measuring instruments required for
calibration .
■ Measuring instruments required for calibration
■ Calibration procedures
● I/O check
(1) Select the [I/O Check] tab.
(2) Select a desired item from the check contents.
(3) Click [Execute] .
The input system (key and digital input) is shown on the personal computer screen
while the input status (ON/OFF) of this unit is being read continuously.
For the output system (control output and event output), the status (ON/OFF) you
have checked on desired check boxes is output from the output terminal of this
unit.
● PV input calibration
(1) Select the [PV Calibration] tab.
(2) Select the gain No. in the ascending order and perform the operation from step
(3).
(3) Click [Read] .
(4) Apply the voltage, current, and resistance values written next to the gain No. to
the PV input terminal.
For details about how to connect measuring instruments in the apply status, refer
11-2
Chapter 11. CALIBRATION
Measuring instrument Specifications
Reference current/ Accuracy: ±0.1% or less, Minimum resolution: 100 µV
voltage generator or less (voltage), Minimum resolution: 100 µA or less
(current)
Resistor Accuracy: ±0.1% or less, Minimum resolution: 0.1 Ω or
less
Ammeter Accuracy: ±0.1% or less, Minimum resolution: 1µA or
less
Thermometer Accuracy: ±0.1˚C or less, Minimum resolution: 0.1˚C or
less