American Weigh Scales

ACPro Series User Manual

ACP-200 (200x0.01g)

ACP-500 (500x0.1g)

Copyright © 2010 American Weigh Scales, Inc.

All rights reserved. Rev. 2.0

ACPro Series User Manual

Thank you for purchasing the American Weigh

ACPro Series digital pocket scale. Please read all operating instructions carefully before use. Scales are precision measuring devices and should always be handled with proper care. To ensure years of reliable service, keep these simple tips in mind:

•

•

•

•

•

•

•

•

•

•

Do not exceed the scale’s maximum capacity.

Overloading your scale can permanently damage it!

Avoid exposure to extreme heat or cold. Scales perform best at normal room temperature. If temperatures have changed dramatically, calibration adjustment may be necessary.

Allow your scale to warm up for 30-60 seconds before performing calibration (if available).

Store your scale in a clean, dry location. Dust, dirt, and moisture can accumulate on the weighing sensors and electronics causing inaccuracy or malfunction.

Avoid using your scale in close proximity to strong radio wave emitting devices such as computers, cash registers, and cordless phones.

Always weigh on a flat and level surface, free from vibrations and drafts. The corner of a room is usually the most stable.

Gently apply all items to be weighed. Do not drop items onto the weighing platform.

Avoid dropping your scale. The warranty does not cover damage due to rough treatment or overload.

Check the batteries first if you are having any trouble with your scale. This simple step can remedy most scale issues.

Do not disassemble your scale. This product contains no user serviceable parts.

I. Part List

1. Scale

2. User Manual and Terms and Conditions

3. Removable Cover / Expansion Tray

4. AAA Batteries (x2)

II. Key Description g ct

ON/OFF Key

ON/OFF MODE g

TARE ct

PCS

Pcs. Key

Mode Key Tare Key

ON/OFF MODE TARE PCS

III. Battery Installation

1. Before using the scale for the first time, check the battery compartment and remove any plastic insulation strips or packaging that may be in place to prevent battery drainage during shipping/storage.

2. If you are replacing the batteries, make sure the positive and negative contacts are properly aligned.

ACPro Series User Manual

IV. Operation

1. Place the scale on a flat, level surface and press the

ON/OFF key to turn the scale on.

2. Once the start-up process completes and the scale goes to zero, you are ready to weigh.

3. Place the quantity to be weighed onto the weighing platform.

4. Wait a couple seconds for the display to stabilize before taking a weight reading.

V. Changing the Unit of Measure

1. Press the MODE key to change the scale’s displayed unit of measure.

2. If the scale is turned off, then back on, it will default to the last unit used.

• ACP-200 Units: g (gram) dwt (pennyweight) ct

(carat) gn (grain)

• ACP-500 Units: g (gram) oz (ounce) ozt (troy ounce) dwt (pennyweight)

VI. Using the Tare Feature

You can use this scale’s tare feature to subtract the weight of an empty container or vessel for net weight determination.

NOTE: The weight of the container will subtract from the available capacity.

1. Place the empty container or vessel on the weighing platform.

2. Press the TARE key once. The display will then reset to zero. If the container is removed, it’s weight will be displayed as a negative number.

3. You may now fill the container with the quantity to be weighed. The display will show the net weight of

the contents.

4. To return to normal weight display (gross weight), remove any items from the weighing platform and press the TARE key again to re-zero the scale.

VII. Using the Counting Feature

1. Press the ON/OFF key to turn the scale on.

2. Place a sample quantity of the items being weighed on the platform. This quantity should either be 25,

50, 75, or 100 pieces.

3. Once the weight is stable, press and hold the PCS key to enter counting mode setup.

4. The current sample size will be displayed on the bottom right of the LCD.

5. Press the MODE key to change it between 25, 50,

75, or 100 and press PCS to confirm. The count will be displayed on the bottom right of the LCD.

You may now add more items. As items are remove items and the count will update automatically.

VIII. Calibration

Calibration and adjustment are performed at the factory.

However, the weighing range can shift slightly during shipping. Also, due to changes in local acceleration of gravity around the world, adjustment is recommended when moving the scale from one location to another. To check calibration:

1. Place the required calibration weight on the scale and note the displayed value.

2. If the displayed value is not within acceptable tolerance (see chart on next page), adjustment is required.

ACPro Series User Manual

Model

ACP-200

ACP-500

Acceptable

Tolerance (±)

0.02g

0.2g

Calibration

Weights

100g, 200g

500g

Recommended

Accuracy Class

OIML M2

OIML M2

IX. Calibration Adjustment

1. Press the ON/OFF key to turn the scale on.

2. Press and hold the MODE key for three seconds until the display shows “CAL” then release.

3. Press the MODE key again, and the LCD will flash the first calibration weight. Place the required weight on the middle of the platform

4. The LCD will flash then flash the second required calibration weight. Place the required calibration weight on the middle of the platform. Skip this step for model ACP-500.

5. The LCD will display “PASS” and return to normal weighing mode. Calibration is complete!

X. Troubleshooting

• Problem: Scale will not turn on

• Solution: Check the battery

• Problem: Displayed weight fluctuates randomly

• Solution: Make sure your workspace is stable and

free of any air currents or vibration

• Problem: Displayed weight is inaccurate

• Solution: Perform a calibration adjustment

XI. Error Codes

1. OUTZ - Zero range has shifted. Perform calibration adjustment. If the problem persists, the load cell may be permanently damaged due to overloading.

2. O-LD - Maximum capacity exceeded. Remove the extra weight to avoid damaging the load cell.

3. LO - Batteries are low. Replace the batteries.

4. UNSE - The scale is unstable. Use the scale in a more stable position.

Max. Capacity

Readability

Power

Dimensions

Platform Dimensions

Warranty

ACP-200

200g

0.01g

ACP-500

500g

0.1g

2 x AAA Batteries

2.8 x 4.8 x 0.8 in.

2.5 x 3.0 in.

10 Year Limited Warranty