Olympic 50 - Service Procedures; Calibration

Section Four
Service
Replacing Batteries
1. Disconnect Smart Scale from wall outlet.
2. Ensure Scale is turned off.
3. The battery cover is located at the back of the Scale.
4. Loosen the two screws holding the cover in place (Fig.
4-1).
5. Remove the cover.
6. Remove the batteries and replace with six, size C,
rechargeable Ni-Cad batteries. Replace all six batteries at
the same time. Observe battery polarity.
7. Replace the battery cover and install the two screws
holding it in place.
Replacing Fuses
Fuses are located on the back side of Scale (Fig. 3-1).
There are two fuses:
1. For AC power: 1/8 amp, 250 V, fast acting.
2. For batteries: 1 amp, 250 V, fast acting.
Replace as required.
Calibration
Rationale
As with any precision electronic instrument, the Smart
Scale can drift out of calibration over time. Since no
electronic scale recalibrates itself automatically, the only
way to assure correct recalibration is to place an accurate,
known weight on the scale and make the required internal
adjustments so that the scale displays the correct weight.
Calibration Weights
The Model 50 calibration procedure requires two precision
weights, Cat. No. 56357. Together the two weights weigh
12.5 kg.
Model 50
Calibration Upon Receipt
The Scale was calibrated at our factory in Seattle prior to
shipment. However, it should be recalibrated before being
put into use because local variations in the force of gravity
can affect weight by as much as 20 grams.
Calibration Frequency
Scale calibration should be checked every month for the
first year. Then the frequency can be adjusted based on
how far the Scale readings have drifted. If it is staying
within 20-40 grams, reduce the calibration frequency to
every 12 months. For larger drifts, increase the frequency
to every 3 months. If the drift is very large, check the
Troubleshooting section. |
To begin, place the Scale on a firm, level surface. Ambient
temperature should be between 70° and 75°F, normal
room temperature.
Calibration Switch Access
The calibration switch access panel is located on the front
panel under the controls (Fig. 4-2).
1. Remove the two screws holding the cover in place to
expose the calibration switches.
2. Push Calib switch, S1-2 (Fig. 4-3), up.
Procedure
Turn the Scale on. The display should read “SCALE
CALIb.” If not, make sure the calib switch is up.
1. Turn the Scale on. Exercise the load cells by placing the
two calibration weights in the center of the platform for 10
seconds. Then remove the weight for ten seconds. Repeat
three times.
2. Place the 12.5 kg calibration weights in the center of the *
platform.
3. Adjust the Coarse Zero pot (Fig. 4-3) until the display
reads 16,384 130.
Coarse Zero, R5
Fine Zero, R6
Coarse Span, R7
Fine Span, R8
\ wend-to-end Balance, R9
eee FE
Memory Bank Select, S1-1
Battery Compartment
Cover .
Access Panel
Display Test, S1-3 “
7 = | Calibration Mode, s1-2/ //
Date Code, S1-4
Fig. 4-1 Battery Cover (on back of
Scale)
Page 4-1
Fig. 4-2 Calibration Switch Access
Panel
Fig. 4-3 Calibration Switches
SS50-N 1-220V(B09)
OLYMPIC SMART SCALE, —