Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 26)

3-6 SM 04L31A01-01E
3.2 Control Output Calibration
Allow the instrument to warm up for at least 30 minutes prior to calibration.
Instruments for Calibration
DC current meter Accuracy: 0.01% of rdg
Resistor 250 Ω ± 1%
Overview of Calibration
During calibration of the control output (current output terminal), each output is
connected to one D/A converter, so you must calibrate the outputs separately. The
module installed in the CX1000 is 01. In the CX2000, the modules are numbered in
order (01, 02, 03) from top to bottom. Also within each module, output number 01 is
assigned to loop 1, and output 02 to loop 2.
Calibration Procedure
The calibration procedure can be carried out using keys or communications commands.
Calibration Using Keys
1. Connect a 250 Ω ± 1% resistor and DC current meter in serial to the current
output terminal.
2. Turn ON the unit while holding down the UP arrow key. The calibration screen
appears.
3. Press the Pid Analog Output Adjust soft key. The Pid Analog Output Adjust
screen is displayed.
4. Use the arrow keys and soft keys to select the module number and output
number to be calibrated.
5. While monitoring with a current meter, change the calibration value at each Output
Value (4 mA and 20 mA) so that it falls within the calibration range shown in the
following chart. The first digit of the calibration value corresponds to 0.366211
µ
A.
Output Value Calibration Range
4 mA 3.99 mA—4.01 mA
20mA 19.99 mA—20.01 mA