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• Proper seating of subassemblies
• Condition of external wiring
• Appearance of printed circuit boards and components
• Signs of overheating in equipment
5.3.1.4
Perform the Acceptance Test
Performing this test is optional if all other test results are acceptable.
5. 4.
CALIBRATION
5.4.1
Pre-Calibration
NOTE:
Three trimpots (P17, P16, P15) are used to calibrate the A/D converter; a variable capacitor
(C6) is used for clock calibration (see Figure 5-1and 5-3). The REL301/302 relay has been
properly adjusted at the factory; adjustments by the user are not required. The following Factory
calibration procedure is for reference only.
1)
Turn "OFF" all Vac and Vdc power.
2)
Remove the cover and front panel by using a screw driver.
3)
Connect together all terminals FT-1, 2, 3, 4, 12-19 through an external mating connector.
4)
On the microprocessor module, move jumper from position JP3 to JP6 (see Figure 5-3).
5)
On input/filter module, remove U6 (Sample/Hold device) from its socket.
6)
Connect a digital voltmeter, with at least 5 digit accuracy, to TP3, and TP2 (common) on
the input/filter module.
7)
Using a battery and potentiometer, connect the adjustable voltage to TP1, and common
to TP2 on the input/filter module. Apply voltage per steps 11 and 12 below.
8)
Apply a rated dc voltage across FT-20 and FT-11. Turn "ON" the dc power source.
9)
On the front panel, depress the SELECT push-button until the TEST mode is indicated.
5.4.2
A/D Calibration
10)
Raise the Function field, on LCD display to A/D CAL mode. The value field display shows
the average Hex value of the analog input over one cycle.
11)
Set the Voltmeter input to -4.99878 Vdc. Adjust Pot P16 until the Value display reads
C009.
12)
Set the voltmeter input to +4.99634 Vdc. Adjust Pot 17 until the Value display reds 3FF4.
13)
Turn "OFF" the dc power supply.
14)
Remove the battery voltage from TP1 and TP2.
15)
Remove the digital voltmeter.
16)
Replace U6 in its socket.
When the REL301/302 is being calibrated, move the jumper from JMP3 to JMP6
position on the Microprocessor Module. After calibration, replace the jumper
back to the original JMP3 position.
I.L. 40-386.1
5-15
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