Measurement Systems MSI-3750 User manual

ELECTRONIC
DIGITAL WEIGHT
INDICATOR
User
Guide
Quality
Industrial
Weighing
and Force
Measurement
Equipment
Measurement
Systems
International

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 2 MSI-3750 Digital Weight Indicator ◆ User Guide
TABLE OF CONTENTS
INTRODUCTION....................................................3
3750 Display.......................................................3
3750 Front Panel ................................................ 4
Features .............................................................5
Batteries (Option) ...............................................6
Load Cell Hookup ............................................... 7
SECTION 1 – SCALE OPERATION ...................... 8
Power .................................................................8
Zero ....................................................................9
Tare..................................................................... 9
Setup Tare ........................................................ 13
Net/Gross .........................................................16
Units .................................................................16
Setup Units ....................................................... 17
Peak Hold (Function Key Option) ..................... 18
Print .................................................................. 19
Test ................................................................... 19
SECTION 2 – FUNCTION KEYS ......................... 20
Setup Function Keys ........................................20
SECTION 3 – ID CODES..................................... 22
ID Code Organization ....................................... 22
Using ID Codes ................................................24
Setup ID Codes ................................................ 30
ID Code String 1 & String 2 .............................. 33
SECTION 4 – TOTAL / STATISTICS....................35
Total .................................................................. 35
Auto Total..........................................................36
Total Menu (Setup Total)................................... 37
View Total .........................................................40
Clear All Totals.................................................. 42
Statistics (Option) ............................................. 42
Definitions And Formulas.................................. 43
Using Statistics ................................................. 44
SECTION 5 – 3750 METER SETUP.................... 46
Main Setup Menu .............................................46
Filter.................................................................. 47
LCD Contrast.................................................... 48
Real Time Clock/Calendar................................ 49
Setup Power Menu ........................................... 50
LCD Backlight................................................... 51
Bargraph Menu................................................. 52
Lock .................................................................. 54
SECTION 6 – SET POINTS................................. 58
Setup Set Points Menu..................................... 58
Set Point 1 Through Set Point 8 ....................... 60
Using Set Points ............................................... 62
Enabling / Disabling Set Points ........................66
Using The MSI 3750 As A Grading Scale ......... 67
Relay Output Option ......................................... 69
Relay Applications ............................................ 70
Logic Output (Set Point 8) ................................72
Test Set Point Relays ....................................... 73
SECTION 7 – COMMUNICATION PORTS.......... 74
Electrical Conformance .................................... 74
Comm Port Cabling .......................................... 75
Data Configuration............................................ 78
Output Control .................................................. 78
Comm Port Setup Menu ................................... 80
Comm Port Parameters Menu.......................... 81
Printer / Output Formatting ............................... 85
Example Printer Formatting.............................. 88
Programming The End Of Line String ..............91
Editing The Print String..................................... 93
General Text/Control Character Entry ..............94
Serial Output “@” Commands ..........................95
Computer Operation ....................................... 107
SECTION 8 – SCALE CALIBRATION................ 112
Calibrate General Information ........................ 112
Enable Calibration .......................................... 112
Calibrate Setup Menu..................................... 114
To Select Legal Standard ............................... 114
To Calibrate (Standard Calibration) ................ 116
Calibration Error Messages ............................ 118
Reset Calibration ............................................ 120
Reset All ......................................................... 120
Initial Calibration ............................................. 122
To Enable/Disable AZM .................................. 125
To Adjust The Motion Band............................. 127
Coarse Zero.................................................... 128
Raw Counts .................................................... 129
Calibration Flowchart......................................131
APPENDIX A – SPECIFICATIONS & OPTIONS 132
Specifications .................................................132
Options ........................................................... 133
Meter Mounting Bracket .................................135
APPENDIX B – ASCII TABLE ............................136
APPENDIX C – MENU MAPS............................ 137
APPENDIX D – WIRING CONNECTIONS ........ 141
Load Cell Connections ...................................141
RS-232 Connections ......................................141
2nd Comm Port & RS-485 Connections......... 142
Auxiliary Digital Input ...................................... 142
Relay Option Board Connections ...................143
The MSI Limited Warranty .................................144

MSI-3750 Digital Weight Indicator ◆ User Guide Page 3
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
INTRODUCTION
The Measurement Systems International MSI 3750 Weigh Meter repre-
sents a new level of technology and performance in the Scale Industry. A
16 bit Microcontroller and 20 bit A/D Converter coupled with an alpha-
numeric display gives unprecedented versatility and programmability.
The large, backlit, alpha-numeric display provides precise, unambiguous
indication of operating modes such as Net, Gross, or Total. Digital
calibration makes maintaining the scale a snap, and the single board,
marine-proof (NEMA 4) construction makes for a rugged and reliable
scale. An option card can be plugged in which provides 7 set point relays,
a Logic Output, and an additional isolated RS232 port or RS-485 port. A
Statistics option is available for process or production monitoring of up to
350 ID Codes. The 3750 is designed to meet or exceed the requirements
of all regulatory agencies.
3750 DISPLAY
ozlb
25
∑
AUTO
SETUP
RF LINK
REMOTE
da
PM
N
0 50 75 100
%
METRIC
LEVEL %
RF LEVEL
0
+
-
Motion Indicator
Center of Zero
Low Battery Warning
21 Segment Bargraph
ModeAnnunciators
8 Character (0.5")Alpha-Numeric Message Display
UnitsAnnunciators
6 Digit Weight Display (0.9")

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 4 MSI-3750 Digital Weight Indicator ◆ User Guide
Measurement Systems
International
SETPOINT TOTAL
12
MSI-3750
SEATTLE WASHINGTON U.S.A.
TOTAL VIEWTOTALSETPOINTSID # UNITS
max max
III n =5,000 / III L n =10,000
F1
EXIT
F2 UV F3 F4 F5
TARE
T
ASCII
5
MNO
ENTER
SETUP
EXIT
!
POWER
ZERO
0
CLR
9
@YZ
B/G
INSERT
NET/GROSS
ALPHA
Aa
1
1
ABC
0
SPACE
6
PQR
7
STU
2
DEF
PRINT
3
GHI
4
JKL
8
VWX
Programable Function Keys
Alpha-numeric Keys
3750 FRONT PANEL

MSI-3750 Digital Weight Indicator ◆ User Guide Page 5
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
FEATURES • Designed to meet or exceed all US and international standards.
• 6 Large, .9” digits for clear weight readings from a distance.
• Up to 350 built-in ID Codes with separate Alphanumeric Names,
Tare, Mode. ID Codes are addressed by any customer given
name.
• Easy to read annunciation of ID Names and Menu Prompts are
provided on eight .5” alphanumeric Characters.
• Full RS232 output formatting offers exceptionally versatile data
output. Weight data can be printed in any desired way, the
customer can add any alpha characters and/or printer formatting
commands, including formatting for Bar Code printers.
• Analog bargraph provided for relative to full-scale weight
indication. Also used for tilt indication with the Magnum Fork
Lift System.
• Display illumination uses rugged, long life, LED back-lighting
coupled with a transflective LCD to provide optimum display
contrast under all ambient conditions from full sunlight to total
darkness. Operation is light-sensing automatic or manually set.
• Versatile power input options: AC Only (90-260 VAC 45-65 Hz),
9-36 VDC Input, 18-60VDC and two D Cell Battery operation.
Accessory Power Supplies are available to allow 250VDC
operation as well.
• Easy to maintain: Full digital calibration assures reliable, repeat-
able measurements.
• Selectable for lb, kg, g, tons, metric tons, ounces, and per cent
(some units and /or units switching may be prohibited in legal for
trade units).
• Automatic or manual weight totalization for logging total
throughput.
• Complete Marine sealing ensures reliable operations under harsh
conditions. Rugged cast aluminum package is coated to resist
corrosive atmospheres. Meets all requirements of NEMA 4 and
IP65.
• 8 set points standard – programmable for any in-range weight for
operator alerts or process control. Optional set point Relay
outputs are available for conveyor belt or any other process
control.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 6 MSI-3750 Digital Weight Indicator ◆ User Guide
BATTERIES (OPTION) Type:
2 Standard “D” Cells, or 2 High Capacity Ni-Cads. With standard D cells,
alkaline type is preferred but standard Carbon-Zinc can also be used. Using Ni-
Cads or Carbon-Zinc batteries typically will cut the available battery life in half.
Installing /Changing:
1) The batteries must have enough charge to ensure accurate
operation. (2 batteries in series must total more than 1.6V).
2) Turn the 3750 off.
3) Remove the Battery Cover by turning the cap counter-clockwise.
4) Remove the old batteries by pushing in on the battery rapidly and
allowing the spring to push the batteries out. Replace the batteries
with two fresh “D” cells. The negative end goes in first.
5) Reinstall the battery cap by turning the knob clockwise.
6) (Optional) The batteries can be checked with the Test Mode.
Power displayed is in relative % of battery life. If the number
with fresh batteries is extremely low, (<20%) turn off the power,
remove the batteries, and check that the polarity of both batteries
is correct.
Low Battery Indication
A small Battery Symbol will appear on the LCD when there is approximately
10% of battery life remaining. The symbol will start flashing when power failure
is imminent. At this point the backlight will also turn off to try to conserve battery
life. You must replace the batteries when the symbol starts flashing. The unit will
automatically shut down if the batteries are not replaced shortly after the battery
symbol starts flashing (actual time depends on load conditions).
12V CAR BATTERY INPUT (OPTION)
The 3750 can be configured to accept a 12V Car battery as a power source. A
typical 12V Car battery will provide several weeks of operation before the battery
must be recharged.

MSI-3750 Digital Weight Indicator ◆ User Guide Page 7
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
LOAD CELL HOOKUP 1) Unplug the meter, or if battery powered, remove the batteries.
Remove the front panel of the 3750 with a properly sized Phillips
screwdriver. Note the position of the seal screw that has a side
hole (lower left corner viewed from the front).
2) Gently pull the front panel out and lay it down in front of the cast
housing.
3) Loosen the right side (viewed from the back) liquid tight
feedthrough connector fitting with a 3/4" open wrench. Feed the
Load Cell cable through the liquid tight connector.
4) Strip and tin the Load Cell leads and attach them to the appropri-
ate terminals with a small screwdriver. The 3750 comes standard
with 4 terminal connections which are adequate for cable lengths
of 50' (15 meters). Any shield should be connected to the Shield
terminal. See Appendix D for wiring diagrams.
5) After pulling lightly on the wires to check for firm connection,
take the slack out of the load cell cable as you close up the case.
6) Tighten the liquid tight feedthrough connector to ensure a
watertight enclosure.
7) Put 2 screws in the front panel to hold it in place. Restore the
power (batteries or AC).
8) Refer to the calibration section. If this is a first time hookup of
this capacity load cell, perform the RESET CALIBRATION
procedure followed by the INITIAL CALIBRATION procedure.
If an identical Load Cell with the same capacity was replaced (or
cable replaced, etc.) it should only be necessary to do a standard
calibration.
9) If there were no calibration errors reported and the calibration is
complete, install the remaining screws loosely. When all the
screws are in place tighten them down in a left, right, up, down
pattern, never tightening any one screw all the way until all the
screws are mostly tightened. This ensures even pressure on the O-
ring. If you have access to a torque driver, tighten each screw to 3
to 4 in-lb.
10) Install the meter bracket. See drawing at end of manual.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 8 MSI-3750 Digital Weight Indicator ◆ User Guide
SECTION 1 – SCALE OPERATION
POWER Turns the Weight Indicator On and Off.
To Turn On the Power
Rules for Use:
1) Make sure power is applied. The power source must have sufficient voltage
(depends on power option).
2) Ambient temperature must be between -20°C to +60°C.
➀
POWER
ozlb
25
∑
AUTO
SETUP
RF LINK
REMOTE
da
PM
N
0 50 75 100
%
METRIC
LEVEL
%
RF LEVEL
0
+
-
➁
1) Push POWER. The system performs a
display check: All segments and the Set
Point/Total LED’s illuminate for 3 seconds,
then turn off for 1/2 second.
2) The LCD displays “3750” and the software
version number.
3) The Microcontroller tests the internal
circuitry. Any test failure will produce an
error message on the LCD.

MSI-3750 Digital Weight Indicator ◆ User Guide Page 9
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
ZERO Sets the zero reading of the scale. Use the zero key to take out small deviations
in zero when the scale is unloaded. (See “TARE”, pg. 9, for zeroing (Tareing)
package or pallet weights)
To Zero
Rules for Use:
1) Works in GROSS or NET mode.When in NET mode the display will return
to the negative Tare value
2) The scale must be stable. The scale will not zero if the motion detect
annunciator is on.
3) The scale will accept a zero setting over the full range of the scale (NTEP
and other Legal-for-Trade models may have a limited zero range). Zero
settings above 4% of full scale will subtract from the overall capacity of the
scale. For example if you zero out 100 lb on a 1000 lb scale the overall
capacity of the scale will reduce to 900 lb plus the allowed over-range
amount.
TARE Tare is typically used to zero out a known weight such as a packing container or
pallet and display the load in NET weight. A Tare value is entered in one of
three ways:
1) AUTO TARE – When the TARE key is pushed twice (or once if the Tare
Mode is Auto), the current weight is zeroed and Net Weight is displayed.
2) KEYBOARD TARE – Using the numeric keys, the operator keys in the
desired Tare Weight then pushes the ENTER Key.
3) TARE UP/DOWN – Using the Scroll Keys, the Tare value is changed one
scale division at a time. TARE UP/DOWN is useful for incrementing or
decrementing the current Tare value slightly. The Keyboard Tare and Tare
Up/Down modes can be disabled through the use of SETUP TARE. In the
“AUTO” mode a single push of the TARE key will enact AUTO TARE.
ZERO
0
Push ZERO. The weight reading must be
stable within the motion band for the zero
function to work. The display temporarily
reads “ZEROED” and the digits display 0.
The backup memory stores the zero
reading, and can restore it even if power
fails.
Final: The numeric digits display “0”(or 0.0
or 0.00, etc.).

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 10 MSI-3750 Digital Weight Indicator ◆ User Guide
To Auto Tare
Rules for Use:
1) Only positive gross weight readings can be tared. Weight can be tared in
both the NET and GROSS modes. When in the NET mode, the TARE is not
cumulative, all the weight is zeroed.
2) The motion annunciator must be off. The weight reading must be stable.
3) Setting or changing the tare has no effect on the Gross zero setting.
4) Taring will reduce the apparent over range of the scale. For example, taring
a 10 lb container on a 60 lb scale, the scale will overload at a net weight of
50 lb (60-10) plus any additional allowed overload (usually ~4%).
5) The scale stores the Tare value in the current ID Code memory until cleared.
Each available ID Code can store independent Tare values.
To Read the Tare Value
(without changing it) TARE key function must be set to “KBD/UPDN”.
➀
TARE
T
ASCII
➁
TARE
T
ASCII
N
NET
INDICATION
1) Push TARE. The current Tare value is
displayed.
Note: If the TARE key is setup for “AUTO” only
one push of the TARE key will be necessary.
2) Push TARE again. Assuming no motion,
the display temporarily reads “TARE SET”
and then converts to a “NET” display. All
following readings are deviations from the
set Tare value.
1) Push TARE. The message display reads
“TARE” and the current Tare value appears
on the numeric digits for 2 seconds. Note or
Print the value as desired.
Alternate method: Remove all weight from the
scale (Gross Zero). The numeric display will
show the TARE weight as a negative number.
This method is not as accurate due to the
possibility of zero offset.
➀
TARE
T
ASCII

MSI-3750 Digital Weight Indicator ◆ User Guide Page 11
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
To Clear Tare and return to GROSS mode
To Keyboard Tare
( TARE key function must be set to “KBD/UPDN”)
1) Push TARE followed by CLR (ZERO).
The message display reads “TARE CLR”.
The scale returns to the GROSS mode.
Alternate method: Remove all weight from
the scale (Gross Zero) and push TARE.
The message display temporarily reads
“TARE CLR”. Then the scale returns to the
GROSS mode.
➀
TARE
T
ASCII
➁
ZERO
0
1) Push TARE. The display reads “TARE”.
Any current Tare value is displayed.
2) Using the numeric keys input the value
desired. In this example we’ll use 0.5 lb as
a Tare Value.
Note: The 3750 will automatically place a
leading zero if the Tare value starts with the
decimal point.
3) The Tare Value “0.5” is displayed. Push
ENTER to place the value in the Tare
Register. The display reads “TARE SET”
and displays the Tare value for 1 second.
All subsequent readings have the Tare
value subtracted and are displayed in
“NET” weight.
➀
TARE
T
ASCII
➁
F1
➁
5
MNO
➂
ENTER

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 12 MSI-3750 Digital Weight Indicator ◆ User Guide
To Use Tare Up/Down
( TARE key function must be set to “KBD/UPDN”)
1) Push TARE. The display reads “TARE”.
Any current Tare value is displayed. In this
example a value of 9.5 LB was previously
Tared.
2) Within 2 seconds after pushing the TARE
key, use the UP or DOWN scroll keys to
increment or decrement the Tare value.
Each single push of the scroll keys will
change the current Tare value 1 scale
division. In this example, the scale incre-
ment is .5 lb.
3) The Tare Value “10.5” is displayed. Push
ENTER to place the value in the Tare
Register. The display reads “TARE SET”
and displays the Tare value for 1 second.
All subsequent readings have the Tare
value subtracted and are displayed in
“NET” weight.
Multiple Tare Memories
The 3750 is capable of storing Tare values through the use of the ID Codes.
Each ID code stores an independent Tare. See Section 3 “ID Codes” for more
information.
➀
TARE
T
ASCII
➁
UV
F3
➁
UV
F3
➂
ENTER

MSI-3750 Digital Weight Indicator ◆ User Guide Page 13
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
SETUP TARE Programs the TARE key mode (TAREMODE), the automatic TARE Clear
function (AUTO CLR), and the TAREALL function.
TAREMODE
1) AUTO – Only Auto Tare is in operation. Every time the TARE key is
pushed, the current weight on the scale is tared.
2) KBD/UPDN – In this mode, pushing the TARE key will enable the numeric
keypad for Keyboard Tare and the UP/DOWN scroll keys for TARE UP/
DOWN. Also in this mode, pushing the TARE button a second time will
enact AUTO Tare.
TAREALL
The TAREALL feature allows a single Tare value to be shared by all ID Codes.
With TAREALL enabled the individual Tares stored with each ID Code are
ignored (but not erased). Disabling TAREALL will restore the original Tare
values. TARE ALL is intended for those applications where a common carrier or
pallet is used, but multiple ID Codes are necessary for data collection.
AUTO CLR
Enabling “AUTO CLR” causes the 3750 to clear the Tare Value after each lift
greater than 0 NET. The Tare Value is cleared and the display mode reverts to
Gross Weight once the load is removed (the weight goes below 0 NET). The
“ON TOTAL” setting clears the Tare Value after the load is totaled. The default
for the “AUTO CLR” function is “DISABLED” . When disabled, the Tare Value
can only be cleared manually (see “To Clear Tare and return to Gross Mode”.)
TARE KEY MODE
MENU
TARE SETUP MENU
TARE AUTO CLEAR MENU
ON TOTAL
ENABLED
DISABLED
TAREMODE
AUTO CLR ENTER
ENTER
ENABLED
DISABLED
TAREALL ENTER
TAREALL MENU
AUTO
KBD/UPDN
EXIT
SETUP
!
TARE
T
ASCII

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 14 MSI-3750 Digital Weight Indicator ◆ User Guide
To Setup the Tare Key Mode
To Enable Tare Auto Clear
➀
EXIT
SETUP
!
SETUP
➀
TARE
T
ASCII
TAREMODE
➁
ENTER
AUTO
➂
UV
F3
KBD/UPDN
√
ENTER
TAREMODE
➄
EXIT
SETUP
!
1) Push SETUP followed immediately by the
TARE switch.
Note: If the TARE switch was pushed too late,
the scale will go into the main SETUP menu.
Push EXIT and try again.
2) Push ENTER. The first menu choice is the
current TARE key mode. In this example,
the “AUTO” mode is enabled. We’ll
change the mode to “KBD/UPDN”.
3) Push the UP key to change the Tare Key
mode to “KBD/UPDN”.
4) Push ENTER. The Scale returns to the
SETUP TARE menu.
5) Push EXIT to return to normal operation
with the TARE key function altered.
➀
EXIT
SETUP
!
SETUP
➀
TARE
T
ASCII
TAREMODE
➁
UV
F3
TAREALL
➁
UV
F3
AUTO CLR
➂
ENTER
DISABLED
1) Push SETUP followed immediately by the
TARE switch. The first menu choice
“TAREMODE” appears.
Note: If the TARE switch was pushed too late,
the scale will go into the main SETUP menu.
Push EXIT and try again.
2) Push the UP scroll key to change the menu
to “AUTO CLR”.
3) Push ENTER. The first selection is the
current AUTO CLR mode.

MSI-3750 Digital Weight Indicator ◆ User Guide Page 15
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
√
UV
F3
ENABLED
➄
ENTER
AUTO CLR
≈
EXIT
SETUP
!
4) Push the UP key to change the AUTO CLR
mode to “ENABLED”.
5) Push ENTER. The AUTO CLR is now
enabled and the 3750 is back in the SETUP
TARE menu.
6) Push EXIT to return to normal scale
operation (with the AUTO CLEAR TARE
function enabled).
To Enable TAREALL
➀
EXIT
SETUP
!
SETUP
➀
TARE
T
ASCII
TAREMODE
➁
UV
F3
TAREALL
➂
ENTER
DISABLED
√
UV
F3
ENABLED
➄
ENTER
TAREALL
≈
EXIT
SETUP
!
1) Push SETUP followed immediately by the
TARE switch. The first menu choice
“TAREMODE” appears.
Note: If the TARE switch was pushed too late,
the scale will go into the main SETUP menu.
Push EXIT and try again.
2) Push the UP scroll key to change the menu
to “TAREALL”.
3) Push ENTER. The first selection is the
current TAREALL mode.
4) Push the UP key to change TAREALL to
“ENABLED”.
5) Push ENTER. TAREALL is now enabled
and the 3750 is back in the SETUP TARE
menu.
6) Push EXIT to return to normal scale
operation (with the TAREALL function
enabled).

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 16 MSI-3750 Digital Weight Indicator ◆ User Guide
NET/GROSS Switches the display between Net and Gross modes. Net Weight is defined as
Gross Weight minus a Tare Weight. Note: Switching back to Gross mode from
Net mode will not clear the Tare value. This allows the operator to use the Gross
Mode temporarily without having to reestablish the Tare value. Only manually
clearing the Tare or setting a new Tare will change the tare value held before
switching into Gross Mode.
OIML Legal-for-trade units only: The NET/GROSS key is temporary action only. The
Gross weight is displayed for 2 seconds and then the display returns to the Net Mode.
The only way to return to permanent Gross readings is to clear the Tare (see “To Clear
Tare and return to GROSS mode”, pg.11).
To Switch Between Net Mode and Gross Mode
N
NET
INDICATION
INSERT
B/G
NET/GROSS
INSERT
B/G
NET/GROSS
N
1) Starting in the NET weight mode –This
example has a TARE weight equal to 40.5
lb. Push NET/GROSS. The message will
briefly display “GROSS”. All subsequent
readings will be Gross weight until the
NET/GROSS key is pushed again, or until
the TARE is changed.
Note: If working with an ID Code present the ID
Name will return to the message display after
the “GROSS” or “NET” message shows.
2) Pushing NET/GROSS again will revert the
display to the NET mode.
UNITS Allows easy weight units conversions. Up to 8 Units are available. See “SETUP
UNITS” for details on activating the available units.
Note: This operation requires that one of the Function Keys is setup as the UNITS key.
See “FUNCTION KEYS”. The example given below has F5 programmed to be “UNITS”
which is the default 3750 mode. Change the example as required if one of the other keys
is programmed to be “UNITS”. 3750s equipped with the Statistics Option are limited to
one functional unit. Statistical Units can be changed only if all the ID Code Totals are
Cleared using the “CLEAR ALL TOTALS” procedure in Section 4.

MSI-3750 Digital Weight Indicator ◆ User Guide Page 17
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
To Change the UNITS
SETUP UNITS Enables the desired weight units for activation by the UNITS key. For example,
if an operator only wants pounds and kilograms activated, all other units can be
disabled. This Menu is moved to the Calibrate Setup menu in NIST and OIML
units.
Note: This operation requires that one of the Function Keys is setup as the UNITS key.
To Enable/Disable UNITS
UNITS
F5
KILOGRAM
UNITS
F5
SHORTTON
Push UNITS (Usually F5). The displayed
weight will change to the next activated
unit. If more than two units are activated,
pushing the UNITS key will rotate through
the available choices.
1) Push the SETUP key followed immedi-
ately by the UNITS key (usually F5). The
menu will display “UNITS”
Tons available on capacities 2,000 lb and over.
Metric Tons available on capacities 1000 kg and
over. lb-oz, oz, and g available on scales 250 lb
and under.
2) Push ENTER. The unit POUNDS will
appear.
3) The numeric display will read “On” if the
displayed unit is activated or will read
“OFF” if it is inactivated. Use the LEFT or
RIGHT Cursor keys to change the status of
the displayed unit from “On” to “Off”
4) Use the UP Scroll key to scroll through all
the available UNITS and use the LEFT or
RIGHT Cursor keys to enable (On) or
disable (OFF) the unit as desired.
Note: If the user attempts to disable all units,
Pounds will automatically be enabled. OIML
units are limited to kg, g, and metric Tons.
5) When finished selecting units, push EXIT
to return to normal scale operation.
➀
EXIT
SETUP
!
SETUP
➀
UNITS
F5
UNITS
➁
ENTER
➂
F4
√
UV
F3
KILOGRAM
 Scroll Through Available units
√
UV
F3
GRAMS
≈
EXIT
SETUP
!

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 18 MSI-3750 Digital Weight Indicator ◆ User Guide
PEAK HOLD (FUNCTION KEY OPTION)
Allows monitoring peak weight. Uses a special mode of the A/D converter for
capturing transient events.
To Capture Peak Weight Readings
1) Program a FUNCTION key for “PEAKHOLD” (See Section 2).
2) Turn on the Peak Hold mode by pushing the selected FUNCTION key. The
display reads “PEAK NET” or “PK GROSS” to indicate peak hold mode is
enabled. The display will only update when a greater value than previously
recorded is detected.
To Clear Peak Weight Readings
Turn off the Peak mode by pushing the FUNCTION key programmed as
“PEAK HOLD”. The 3750 reads “PEAK OFF” and clears the peak value from
memory. The display will revert to NET or GROSS mode.
Note: Peak Hold captures data at a reading rate of 7.5 times per second. It has a full
scale step time constant of approximately 150ms. This function is not suitable for high
speed dynamic testing.
SELECT UNITS
LBS-OZ
GRAMS
OUNCES
METRIC T
TONS
KILOGRAM
POUNDS
ON
OFF
EXIT
SETUP
!
UNITS
F5

MSI-3750 Digital Weight Indicator ◆ User Guide Page 19
M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
➀
EXIT
SETUP
!
SETUP
➀
9
@YZ
ozlb
25
∑
AUTO
SETUP
RF LINK
REMOTE
da
PM
N
0 50 75 100
%
METRIC
LEVEL
%
RF LEVEL
0
+
-
Final: Either the reading returns to
the pre-test condition, or an error
message is displayed.
1) Push the SETUP key followed immedi-
ately by the 9key.
a) All segments turn on for 1 second, then off
for 1/2 second.
b) All digits (7 segment and 16 segment)
count once from 0 to 9. All anunciators are
tested including lb, kg, t. and the Total
LED.
c) Battery condition is displayed next in the
form: % of Battery life with a figure from 1
to 100 on the digits. The % battery life will
vary depending on whether the backlight is
on or off.
d) Internal tests are performed to further
ensure scale integrity.
PRINT Sends the current displayed reading to the printer or selected Comm Port, unless
otherwise setup in the Print Setup menu . Any or all weight, time, date, and scale
parameter functions can be printed as set in the Comm Port Parameters Menu.
Refer to Section 7 for more details.
Pushing the PRINT button alone will cause both Comm Ports to output their
specified print string unless specifically disabled in the Comm Port Parameters
Menu.
TEST Provides a functional system test, and an on-demand display check without
disturbing the current weighment. The Test function can be interrupted by
pushing any key during the test.
Note: The TEST function is also available as a FUNCTION key function. See “FUNCTION
Keys” Section 2.
Test Meter Operation

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 20 MSI-3750 Digital Weight Indicator ◆ User Guide
SECTION 2 – FUNCTION KEYS
SETUP FUNCTION KEYS
The 3750 has five FUNCTION keys that can be programmed to any of several
functions. The default functions are: ID#, SET POINTS, TOTAL, VIEW
TOTAL, and UNITS. Each key can be programmed for other functions. For
example, the UNITS key can be changed into a GRAND TOTAL key. Also any
of the five keys can be disabled.
MSI provides Function Key Labels with every 3750. After the Function Keys are
programmed as desired, apply the appropriate label to the embossed area above
the key. MSI can supply custom labels on request. For example, if the String 1
function is to be used to input a customer number, MSI can supply a label that
reads “CUSTOMER”. Contact MSI to order custom Function Key labels.
EXIT
F2 UV F3
F1 F4 F5
Function Default Function Description
CLRLATCH Clears any latched Set Points
DISABLED Key does nothing
GRNDTOTL Gives the grand total of all ID Codes
ID NUMBR F1 Push to change the ID Code
PEAKHOLD Turns Peak Hold on and off.
SCALENUM Changes the Scale Input
SETPOINT F2 Allows setting the set point values.
STATS Shows Statistics on the current ID Code.
STRING 1 Direct access to ID String1. Use for Customer Name, Operator,
etc.
STRING 2 Direct access to ID String2. Use for Customer Name, Operator,
etc.
TEST Setup 9 Test Display, battery, A/D converter (see TEST)
TOTL F3 Add current weight to the total (Manual Total) or turn Auto
Total On/Off (Auto Total Mode).
UNITS F5 Change weight Units.
VIEW ∑F4 Display the Total weight of the current ID Code.