Watlow Calibrating Watlow Series 988 Family Process Controls - Manual (Page 17)

WATLOW Series 988 Calibration Manual
17
Retransmit
mA Retransmit Output 3 Procedure
Equipment Required
• 4 1/2 digit Digital Multimeter
Setup and Calibration
1. Connect the AC voltage L1, L2 and ground to the proper terminals on the
Series 988. See Chapter 2 in the user’s manual.
2. Connect the digital multimeter to terminal #1 (+) and terminal #2 (-). Set the
DVM to read a range of 0 to 20mA. Connect the leads of the DVM to measure
current.
3. Apply power to the unit and let it warm up for 15 minutes. After warm up put
the unit in the CAL menu. See Page 6.
4. At the 3 LO prompt, the multimeter should read approximately 0.1mA. Use the
Up or Down keys to adjust the reading on the multimeter for 0.00mA
±
0.05mA.
Allow the control to stabilize for 10 seconds. Press the Mode key to enter and
advance to the next prompt.
5. At the 3 HI prompt, use the Up or Down keys to adjust the reading on the multi-
meter for 20mA
±
.05mA. Allow the control to stabilize for 10 seconds. Press
the Mode key to enter and advance to the next prompt. To conclude the
process retransmit output calibration, press the Display key.
VDC Retransmit Output 3 Calibration
Equipment Required
• 4 1/2 digit Digital Multimeter
Setup and Calibration
1. Connect the AC voltage L1, L2 and ground to the proper terminals on the
Series 988. See Chapter 2 in the 988 User’s Manual.
2. For Output #1 calibration: Connect the digital multimeter to terminal
#1 (+) and terminal #2 (-). Set the DVM to read a range of 0 to 10VDC.
Connect the leads of the DVM to measure volts DC.
3. Apply power to the unit and let it warm up for 15 minutes. After warm up put
the unit in the CAL menu. See Page 6.
4. At the 3 LO prompt, the multimeter should read approximately 0 volts. Use the
Up or Down keys to adjust the reading on the multimeter for 0.0VDC
±
0.1 volt.
Allow the control to stabilize for 10 seconds. Press the Mode key to enter, and
advance to the next prompt.
5. At the 3 HI prompt, use the Up or Down keys to adjust the reading on the multi-
meter for 10.0VDC
±
0.1VDC. Allow the control to stabilize for 10 seconds.
Press the Mode key to enter, and advance to the next prompt. To conclude the
voltage process retransmit output calibration, press the Display key.