5.DMM #1 should read 4.995 V, ±.01 V
6.If the reading of step 5 is out of tolerance, adjust potentiometer R35 on CPU Board to correct.
7.Recheck both points and readjust if required.
5.8.2 Current Output Span & Load
The current output circuitry is provided with two calibration adjustments. Potentiometer R50 is used for span adjustment and R49 for load compensation. For these tests DMM #2 using the current measurement function is connected in series with a 250 ohm resistor load as shown in Figure
1.Adjust input test circuit for 4.995 V on DMM #1.
2.DMM #2 should read 20 mA. If necessary, adjust pot R50 to correct.
3.Press load pushbutton while observing DMM #2. If current reading increases, adjust R49 CCW. If reading decreases, turn it CW. Repeat procedure until change is less than
±.02 mA.
4.Final reading should be 20 mA, ±.02 mA. If necessary, reset pot R50 and repeat procedure.
5.Calibration is complete. Restore unit to normal operating status.
5.9 PCB REFERENCE DRAWINGS
Table
Table 5-1 - CPU Board & Termination Board Reference Table
Fig. | Assembly | Part # | Pag |
|
|
| e |
Assembly, Analog Type CPU Board w/ Current Output (12V) | |||
Assembly, Analog Type CPU Board w/ Current Output (24V) | |||
Assembly, Analog Termination Board | |||
Assembly, Raise/Lower Type CPU Board w/ Current Output (12V) | |||
Assembly, Raise/Lower Type CPU Board w/ Current Output (24V) | |||
Assembly, Raise/Lower Termination Board |
Service |