DICKEY-john GAC2500-UGMA August 1, 2023

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United States Department of Agriculture 

Agricultural Marketing Service 

Federal Grain Inspection Service

Calibration Update August 1, 2023 

DICKEY-JOHN GAC 2500-UGMA PRODUCT CALIBRATION DOWNLOAD 

FORWARD

AMS’S Federal Grain Inspection Service (FGIS) offers product calibration files for loading to 

the DICKEY-john GAC 2500-UGMA Grain Moisture Analyzer. 

NOTE: For technical assistance, please contact DICKEY-john technical support at 

1-800-637-3302

1.DOWNLOAD CALIBRATIONS FROM FGIS WEBSITE........................................................ 2

2. VERIFY INSTRUMENT SOFTWARE VERSION ................................................................. 3

3. LOAD CALIBRATIONS TO GAC® 2500-UGMA .................................................................. 3

4. RELOADING CUSTOM CALIBRATIONS TO GAC 2500-UGMA........................................ 6

5. EXPORT LOG FILE/AUDIT TRAIL (OFFICIAL USERS ONLY) ........................................... 7

6. FORMATTING A USB MEMORY DEVICE............................................................................. 9

The U.S. Department of Agriculture (USDA) prohibits discrimination in its programs on the basis 

of race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial 

status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 

alternate means for communication of program information (Braille, large print, audiotape, etc.) 

should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD).

To file a complaint, write to the USDA, Office of Civil Rights, Room 326-W, 1400 Independence 

Avenue, SW, Washington, DC 20250-9410, or call (202) 720-5964 (voice and TDD). USDA is an equal 

employment opportunity employer.
DICKEY-john GAC2500-UGMA August 1, 2023

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1. DOWNLOAD CALIBRATIONS FROM FGIS WEBSITE

If a USB memory device with preloaded calibration files is already in your possession,

proceed to the “Load Calibrations to GAC 2500-UGMA” section.

NOTE: Before downloading calibrations verify the USB memory device is 2-4 GB

and formatted as FAT and NOT FAT32. See “Formatting USB Memory Device”

section for formatting instructions.

To download calibrations to a USB memory device:

a. Visit the FGIS Moisture website at https://www.ams.usda.gov/services/fgis/

standardization/moisture-equipment.

b. Insert USB memory device into computer’s USB drive.

- Remove all existing files from USB memory device.

c. Scroll down to the “Official Moisture Calibrations” section and right click on

“Download all official moisture calibration files for DICKEY-john GAC 2500-

UGMA/GAC 2700-UGMA”.

Product calibration files are saved in a zip format and require extraction before

loading to the GAC 2500 instrument.

IMPORTANT: All official calibrations must be downloaded to the USB memory

device.

d. Select “Save Link As” and save the zip folder to the root directory of the USB

memory device. (Some computers may display “Save Target As”.)

e. In Windows Explorer, double click on the directory named: “MonthYearRelease_

GAC2500_UGMA_NTEP_withUpdater.zip”

ex: May 2019 Release_GAC2500_UGMA_NTEP.zip.

f. Select all files in the directory (Edit/Select All).

g. Copy all files (right click/copy).

h. Paste in the root directory of the USB memory device (right click/ paste).

NOTE: Root directory (such as F:/) is the first directory that shows when opening 

a drive. If having issues locating the root directory, go to “Start/My Computer” 

and open the USB memory device. Proceed to step i.

i. Wait for files to finish copying and remove USB memory device.

IMPORTANT: Steps to download calibrations vary based on the software installed 

on the instrument. Check the software version of the instrument for the proper 

steps to follow in this instruction.
DICKEY-john GAC2500-UGMA August 1, 2023

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2. VERIFY INSTRUMENT SOFTWARE VERSION

At the Main Menu of the GAC® 2500, press the Information button. Follow

the appropriate instructions below based on software version installed.

Figure 1. Information Screen

3. LOAD CALIBRATIONS TO GAC® 2500-UGMA

a. SOFTWARE VERSION 5.4 or ABOVE:

IMPORTANT: Any custom calibrations on the instrument should be saved to 

a USB memory device before starting the installation. 

1) Insert the USB device into the instrument.

2) At the Main Menu screen, press the Setup button.

3) Enter the user name and password and press the Enter button.

4) At the Setup menu, press the Product button.

5) At the Product Setup screen, press the Load New Products button.

6) The next screen displays the number of files that exist on the USB memory

device.

7) Press the Enter button.

8) Press “Yes” to begin installation of new files. Old products are removed

(including custom calibrations).

– Refer to “Reloading Custom Calibrations” section for re-installing custom

calibrations.
DICKEY-john GAC2500-UGMA August 1, 2023

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Figure 2. Loading Calibrations with Software Version 5.4

9) Remove the USB device from instrument.

10) After loading calibrations, the Product Setup screen displays. Press the Home

button to return to the Main Menu.

11) At the Main Menu, cycle power.

12) After power up, press the Information button to verify that “08-01-23” displays

as the new date at the Directive No, shown in Figure 3, as a good calibration

install.
DICKEY-john GAC2500-UGMA August 1, 2023

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Figure 3. Information Screen

b. SOFTWARE VERSION 5.1 OR BELOW

1) Power OFF the GAC® 2500-UGMA.

2) Insert the USB memory device into the GAC® 2500-UGMA USB port located

on the front panel.

3) Power on instrument.

4) Files automatically begin loading to the instrument. The program will back up

all existing calibration f iles and install the new ones.

5) Press the Close button to exit.

6) When update is complete, press ‘No’ to avoid running the program again.

Figure 4. Product Updater 

7) Remove the lash drive and the instrument continues to powerup.

8) Once the machine is powered on, custom calibrations that were not

included in the updater package can be restored by navigating to the

backup directory on the lash drive named <machine serial number>_

OldCals_<date(yyyyMMdd)>_<time(HHmm)>. These calibrations can

be reloaded from the Setup menu.
DICKEY-john GAC2500-UGMA August 1, 2023

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4. RELOADING CUSTOM CALIBRATIONS TO GAC 2500-UGMA

a. Insert USB memory device into the GAC 2500-UGMA USB port located on the

front panel.

b. At the Main Menu screen, press the Setup button.

c. Enter the Name and Password, if required, or press Enter to proceed.

d. At the Setup screen, press the Product button.

e. At the Product Setup screen, press the Load New Product button. Do not use

the Load New Products button to reload custom calibrations.

NOTE: The USB memory device must be inserted into the instrument to display 

the Load New Product button.

f. To load a single product, press the directory contents file to highlight.

g. Press the Enter button to open the directory.

h. In the Directory Contents window, press the custom calibration to highlight and

press the Enter button.

Figure 5. Re-Load Custom Calibrations

Directory structure to find custom calibrations:

<machine serial number>_OldCals_<date(yyyyMMdd)>_<time>(HHmm)>
DICKEY-john GAC2500-UGMA August 1, 2023

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5. EXPORT LOG FILE/AUDIT TRAIL (OFFICIAL USERS ONLY)

After calibrations are loaded to the instrument, the log file/audit trail data must be saved

to the USB memory device and retained at the central agency office to document that

calibrations were installed successfully.

IMPORTANT: This final step is required for verification that calibrations loaded

successfully.

a. Insert USB memory device into the USB port.

b. At the Main Menu screen, press the Results button.

c. At the Results menu, press the Audit Trail button.

Figure 6. Save Audit Trail History

d. At the Audit Trail screen, press the Filter button to verify that the

“Show Calibration Changes” check box is selected.

e. Press the Enter button to accept.

f. Press the USB button to transfer Audit Trail results.

g. Audit Trail screen will indicate 64 PRODUCT ADD entries preceded by a

PRODUCT DELETE for each product previously installed on the instrument before

the update.

h. Remove the USB memory device from the instrument and retain at the central

agency office to document successful completion. Audit trails for multiple units and

other models can be saved on the same USB memory device.
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Figure 7. Export Audit Trail

i. Press the Home button.

j. At the Home menu screen, press the Instrument Information button and

verify the directive number reads: 9180-61 08-01-23.

Figure 8. Verify Directive Number
DICKEY-john GAC2500-UGMA August 1, 2023

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5. FORMATTING A USB MEMORY DEVICE

To verify a memory device is FAT:

a. Insert the USB memory device into the computer.

b. Navigate to “My Computer”, locate the directory for the memory device, and click

“Properties”.

c. Look at the ‘File System’ type under the General Tab and verify the device is FAT.

NOTE: USB memory device should have 2-4 GB of storage capacity.

Figure 9. Verify Formatting of USB Memory Device

Reformat memory device to FAT:

d. In “My Computer”, right click on the memory device directory.

e. Click “Format”.

f. Select “FAT” as the file system format.

g. Click “Start”. The USB memory device is now FAT formatted.

Figure 10. Formatting Memory Device to FAT