8. Turn on the main power switch.
9. Press Up and Down Arrow keys simultaneously for 3 seconds. The
word “InPt” appears in upper display, and “Set” appears in lower
display.
10. Press Down Arrow once, then continue to press the Mode key until
“LOC” appears in lower display. Upper display shows 2. Press Down
Arrow until 0 appears.
11. Press the Mode key once, then Up Arrow once. “InPt” appears in
upper display, and “Set” in lower display. Press the Mode key until
“CAL 1” appears in lower display. Press Up or Down Arrow key to
either add or subtract an offset value. This value is the difference
between the actual value shown on the controller, and the reference
sensor value.
12. Press the Display key once. The hardware and software lockout is Off.
To turn the hardware and software lockout back On:
1. Press the Up and Down Arrow keys simultaneously for 3 seconds. The
word “InPt” appears in upper display, and “Set” in lower display.
2. Press the Down Arrow once, then continue to press the Mode key
until “LOC” appears in lower display. Upper display shows 0. Press Up
Arrow until 2 appears.
3. Press Display key once.
4. Turn off main power switch.
5. Wear a grounding wrist strap to avoid damaging any electrical
components.
6. Remove the 982 controller module(s) by pressing in the four retaining
tabs; two on the right side, two on the left side. Pull the controller
module out by gently rocking it from side to side.
7. Looking at the top and right side of the controller module, locate the
red DIP switches. Use your fingernail, or a small screwdriver, to turn
On SW2 by moving the white toggle towards the back of the module.
8. Return the controller to its frame and press firmly on the top and
bottom of the bezel until all four locking tabs “click” into place.
9. Turn On the main power switch.
4-6
Model 3940 Series
Thermo Electron Corporation
Section 4
Service
Offset Calibration
(continued)
Summary of Contents for 3940 Series
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