GDC-350 Operation Manual
32
5909-9000
Rev
1
5.7. Calibrating 4-20 mA Signal for Incoming Analog Transmitter
To perform this function you will need an accurate current source able to generate
4.0 mA and 20.0 mA current signals, or a Bacharach GDC-150.
USING A CURRENT SOURCE TO CALIBRATE THE NULL (ZERO)
Step
Using A Current Source to Calibrate the Null (Zero) Procedure
1
Connect the current source to pin 10 and ground to pin 11 on the wiring
terminal block.
2
Set the current source to 4.0 mA.
3
Move the jumper on J6 to P3 and the jumper on J7 to P3.
4
The instrument will beep once for confirmation. The system is now starting
the zero calibration stabilization time (30 seconds).
5
If desired, attach volt meter leads to test points TP1 and TP2. Monitor the
voltage.
6
The instrument will beep twice when the calibration begins. The
instrument beeps three times indicating the procedure is finished
(2 minutes).
7
Move the jumpers from J6 and J7 back to their P1 resting positions.
USING A CURRENT SOURCE TO CALIBRATE THE SPAN
Step
Using a Current Source to Calibrate the Span Procedure
1
Connect current source to pin 10 and ground to pin 11 on the wiring
terminal block.
2
Set the current source to 20.0 mA.
3
Move the jumper on J6 to P3 and the jumper on J7 to P4.
4
The instrument will beep once for confirmation. The system is now starting
the span calibration stabilization time (30 seconds).
5
If desired, attach volt meter leads to test points TP1 and TP2. Monitor the
voltage.
6
The instrument will beep twice when the calibration begins. The
instrument beeps three times indicating the procedure is finished
(2 minutes).
7
Move the jumpers from J6 and J7 back to their P1 resting positions and
remove the current source.
