Pennsylvania Scale Company 7700 Use and care manual

1
Pennsylvania Scale Company
Model 7700 Scale
Calibration
Manual
Pennsylvania Scale Company
1042 New Holland Avenue
Lancaster PA 17601
For online interactive tech support or more information on Pennsylvania
Scale products, visit our website at www.pascale.com
Revised September 3,2002

2
INTRODUCTION
This manual covers the PROGRAMMING and CALIBRATION of the
Pennsylvania Scale Model 7700 Checkweighing Scale.
The 7700 can be calibrated from the front keypad, or through the RS-232 Interface.
The scale employs a digital calibration technique that makes it very versatile when matching
the scale to the requirements at hand.

3
7700 SERIES CALIBRATION
The calibration of the 7700 is divided into six major categories. The entry point to
each of these categories are the calibration steps that are evenly divisible by ten.
CALIBRATION CATEGORIES
(20) = Program Operational Features
Full capacity, resolution, zero range, zero tracking, enable weighing units, print
condition, Canadian compatibility.
(30) = Checkweigh Programming
Input over and under tolerances. This group is also accessible by pressing and
holding the SET button on the front panel.
(40) = Scale Weight Calibration
Filter speed, dead load weight, half capacity, full capacity and creep correction.
(60) = RS-232 Programming
Baud rate, data length, stop bits, parity, echo and network address.
(70) = Time/Date Programming
Set time and date.
(80) = Print Format
(0) = Exit Calibration
At any of the above steps:
-Press ENTER to access that category.
-Key in the number of any other category and press ENTER to move to that
category.
-Key in a "0" and press enter to leave calibration.
When the last calibration step of each category is reached, the calibration
automatically advances to the next category.
Category (30) may be accessed by pressing and holding the SET button on the front
panel. All other categories may accessed only with the calibration switch on the main PC
board.

4
DATA ENTRY KEYS
Before attempting to calibrate the 7700 scale a thorough understanding of how to
enter data into the scale is necessary. When the scale is put into the program or calibration
modes, the buttons become redefined as follows:
ZERO button will become the ENTER button
When this button is pressed, the number currently displayed is committed to the scale
memory and the scale will advance to the next step.
UNIT button will become the INCREMENT button
This buttonis used to key digits onto the display. Each time the button is pressed the
right most digit will increase by one. After the number "9" is reached, pressing the
INCREMENT button again will reset the right most digit to "0" and the process may begin
again. Pressing and holding the increment button will engage automatic incrementing.
PRINT button will become the ADVANCE button
Pressing this button is like taking the number on the display and multiplying it by ten.
Each time the button is pressed the displayed digits are shifted one position to the left so that
the next significant digit may be entered. If the button is pressed when all six digits are full,
the display will be cleared and the input procedure may be restarted.
SET button will become the DECIMAL button
When pressed, the decimal point appears on the display and is shifted one space to
the left automatically to provide a position for the next digit to be entered. When pressed a
second time, the weight display is cleared and the input procedure may be restarted.
EXAMPLE: To enter the number 320.0, do the following:
-Press the UNIT/INCREMENT button until a "3" shows on the display.
-Press the PRINT/ADVANCE button once, a "30" will be displayed.
-Press the UNIT/INCREMENT button until "32" shows on the display
-Press the PRINT/ADVANCE button once, a "320" will be displayed.
-Press the SET/DECIMAL button once and "320.0" will be displayed.

5
CALIBRATION PROCEDURE
To begin calibration:
The calibration mode is entered by pressing the calibration button on the main circuit
board. To access the main circuit board, remove the screws holding the tower backplate in
place and lower the backplate. The main circuit board is mounted to the backplate and the
location of the calibration button is shown below.
CALIBRATION
BUTTON
FIG. 1
Press the calibration button and the scale will begin the self diagnostic check. Return
the backplate to it’s original position and replace one or two screws, just to hold it in place.
The weight display will be reading "CAL 20" the scale is ready for calibration.

6
CALIBRATION STEPS
STEP DESCRIPTION (* = Default Values)
CAL 20 Manual Calibration Entry Point
Press ZERO/ENTER button
UnS 21 Primary Weighing Unit
Use the UNITS button to select between “lb” or “unit”. (“unit” is a unit of
measure used by the paint mixing industry, if “unit” is selected in step 21 the
fourth unit selection will be disabled, since “lb/oz” will no longer be a valid
display.)
CAP 22 Full Capacity
Key in the capacity of the scale. Press ZERO/ENTER button
rES 23 Resolution
Input the scale resolution. This is the smallest increment the scale will
read. The standard entry is the capacity divided by 5000 and rounded to the
nearest 1, 2, or 5. Press ZERO/ENTER button.
-0-24 Zero Range
Input the amount of weight that will be allowed to be zeroed off.
Normal entry is Full Capacity*. Press ZERO/ENTER button.
0-t 25 Zero Tracking
Input the Zero tracking range as a percentage of the scale
resolution. Normal entry is 0.25* which represents 25% of one resolution.
Press ZERO/ENTER button.
En2 26Enable Second Unit, Ounces
Select Yes or No* by pressing the UNITS button. Press ZERO/ENTER
button.
En3 26Enable Third Unit, Grams or Kilograms
Select Yes or No* by pressing the UNITS button. (The scale will
automatically choose between grams or kilograms based on the capacity.)
Press ZERO/ENTER button.

7
CALIBRATION STEPS (cont’d.)
En4 26Enable Fourth Unit, Pounds/Ounce split display
Select Yes or No* by pressing the UNITS button.
Press ZERO/ENTER button.
Prt 27 Print
Select form the table below by pressing the UNITS button:
-Stable* Print only on stable
-First Auto Print on first stable non-zero weight
-Accept Auto Print on first stable weight in accept range
-Unstable Print when ever requested
Press ZERO/ENTER button.
Cnd 28Canadian Compatibility
Select Yes or No* by pressing the UNITS button.
Press ZERO/ENTER button.
CAL 30 Checkweighing Programming
(May also be accessed from the front panel.)
Press ZERO/ENTER button.
SEt Under Tolerance ("UNDER" indicator blinks)
Enter desired under tolerance in the current weighing unit.
Press ZERO/ENTER button.
SEt Over Tolerance ("OVER" indicator blinks)
Enter the over tolerance in the current weighing unit.
Press ZERO/ENTER button.
CAL 40 Load Cell Calibration
Press ZERO/ENTER button.
FIL 41 Response Time
Use the UNITS button to select a number from "0" to "9" to control how
quickly the display will respond. A "0" gives a quicker response and less
immunity to vibrations. A "9" will give the slowest response but very stable
reading. A "3"* is the normal entry. Press ZERO/ENTER button.
nol 42 No Load
Remove all weight form the platform and press the ZERO/ENTER button. If
creep correction is desired, wait sixty seconds before pressing the
ZERO/ENTER button.

8
CALIBRATION STEPS (cont’d.)
HLF 43 Half Capacity
Apply half load and press ZERO/ENTER button. If a 1/2 capacity weight is
not available, place a substitute weight on the platform, key in the amount of
weight being used and press ZERO/ENTER. If creep correction is desired,
wait sixty seconds between placing the weight on the platform and pressing
the ZERO/ENTER button.
FUL 44 Full Capacity
Apply Full load and press the ZERO/ENTER button. If a full capacity weight
is not available, place a substitute weight on the platform, key in the amount
of weight being used and press the ZERO/ENTER button. If creep correction
is desired, wait sixty seconds between placing the weight on the platform and
pressing the ZERO/ENTER button.
WARNING!!! When using a substitute weight for ½ and full capacity, you must
use weights which meet the specifications in either 1 or 2 below,
or the scale may not calibrate properly.
1. Two weights (one for 1/2 capacity, one for full capacity) that
are greater than 25% of full capacity and differ by at least
50% of full capacity.
EXAMPLE: The weights used for a 100-lb scale could be
30 lb and 80 lb.
OR
2. One weight which is preferably greater than 50% of full
capacity.
nol 45 No Load
Remove all weight from the platform and press ZERO/ENTER button. If
creep correction is desired, wait no longer than ten seconds between
removing
the weight and pressing the ZERO/ENTER button.
CAL 60 RS-232 Program
Press ZERO/ENTER button.

9
CALIBRATION STEPS (cont’d.)
bau 61 Baud Rate
Select a baud rate from the table below by pressing the UNITS button.
300 baud* 2400 baud 19200 baud
600 baud 4800 baud
1200 baud 9600 baud
Press ZERO/ENTER button.
LEn 62Word Length
Select either 7* bit or 8 bit word length by pressing the UNITS button.
Press the ZERO/ENTER button.
SPb 63Stop Bits
Select either 1* or 2 stop bits by pressing the UNITS button.
Press the ZERO/ENTER button.
PAr 64Parity Select none, even or odd* parity by pressing the UNITS button.
Press the ZERO/ENTER button.
Ech 65 Local Echo
Use UNITS button to select if scale is to echo commands back to the
sending device. The choices are:
"Ech" Scale will echo commands.
"no Ech"* Scale will not echo commands.
Press the ZERO/ENTER button.
Adr 66 Network Address
The network address allows several scales to be connected to a network. If
"0"* is entered, network addressing will be disabled. If a number between
"1" and "255" is entered, network addressing in enabled. When enabled ALL
RS-232 commands to the scale MUST be preceded with this address.
Press ZERO/ENTER.
CAL 70 Time and Date Programming
Press the ZERO/ENTER button

10
CALIBRATION STEPS (cont’d.)
Stf 71 Set Time Flag
Select type of clock from the table below:
0 Skip steps 72 &73
1 Military Time
2 12 hour clock, currently AM
3 12 hour clock, currently PM
Press the ZERO/ENTER button.
td1 72 Time
Enter the current time as HHMMSS, All digits must be entered (leadingzeros
not required) Press the ZERO/ENTER button.
td2 73 Date
Enter the current date as MMDDYY. (leading zeros not required)
Press the ZERO/ENTER button.
CAL 80 Print Format Programming
Press the ZERO/ENTER button.
PSL 81Print Slot # 1
PSL 82Print Slot # 2
. .
. .
. .
PSL100 Print Slot # 20
An explanation of formatted printing and print slots follows: