Lutron Electronics GM-1500P User manual

1500 g x 0.05 g
DIGITAL BALANCE
Model : GM-1500P
Your purchase of this DIGITAL BALANCE marks a step forward
for you into the field of precision measurement. Although this
DIGITAL BALANCE is a complex and delicate instrument, its
durable structure developed. Please read the following
instructions carefully and always keep this manual within easy
reach.
OPERATION MANUAL

TABLE OF CONTENTS
1. FEATURES................................................................................................ 1
2. SPECIFICATIONS.................................................................................... 1
3. FRONT PANEL DESCRIPTION ............................................................. 3
3-1 Platform .............................................................................................. 3
3-2 CAL. Button ( function A Button ).................................................... 3
3-3 Tare Button ( function B Button )..................................................... 3
3-4 Display................................................................................................ 3
3-5 Power Switch..................................................................................... 3
3-6 Rubber Pads...................................................................................... 3
3-7 Battery Cover/Compartment .............................................................. 3
3-8 DC 9V Receptacle ............................................................................ 3
3-9 RS232 Output Socket....................................................................... 3
3-10 Unit Switch........................................................................................ 3
4. PLATFORM INSTALLATION .................................................................. 4
5. WEIGHT MEASURING PROCEDURE ................................................. 5
6. SELF-CALIBRATION ................................................................................. 6
7. COUNTING SCALE OPERATION PROCEDURE ............................... 8
8. BATTERY REPLACEMENT.................................................................... 10
9. DC 9V AC/DC ADAPTER OPERATION................................................ 10
10. RS232 PC SERIAL INTERFACE .......................................................................10

1
1. FEATURES
* Microprocessor circuit with high accuracy & better
performance.
* 0.05 g & 0.002 oz resolution & wide measuring capacity.
* Large LCD display, 18 mm ( 0.7" ) digit size, easy read out.
* Built-in gram & oz display unit, select by the internal
slide switch.
* Built-in self calibration system, the calibration value can
memorize into EEPROM circuit permanently even power
off.
* High precision counting scale function.
* RS-232 computer interface.
* Accept battery or AC/DC adapter power source, two way
power supply.
* Built-in " level bubble " & the adjustable " rubber pads ".
* Heavy duty ABS housing plastic case.
2. SPECIFICATIONS
Display
LCD, 18 mm ( 0.7" ) digit size, 5 digits
with annunciator.
Measuring range &
Resolution
Unit
Range
Resolution
g
0.50 g to 1500 g
0.05 g
oz
0.018 oz to 52.908 oz
0.002 oz
Min. Display Weight
g
0.50 g
oz
0.018 oz
Unit Select
g or oz, select by internal slide switch.

2
Accuracy
( 0.05 % + 0.20 g )
* Within two hours after self calibration be
executed.
23 5 蚓
* Spec. tested under the environment RF
Field Strength less than 3 V/M &
frequency less than the 30 MHz only.
Sampling time
Approx. 1 second.
Tare Control
Approx. 1500 g max.
Transducer
Load cell.
Circuit
Microprocessor circuit.
Auto Calibration
Use 500 g or 1000 g standard weight to
execute self-calibration automatically.
Operating
Temperature
0 ℃to 50 ℃( 32 ℉to 122 ℉).
Operating Humidity
Less than 80% RH.
Size
Cabinet
250 x 180 x 70 mm
Platform
185 x 185 mm.
Power Supply
6 x 1.5V AA (UM-3) battery x 6 PCs,
or DC 9V adapter, optional.
Power Consumption
Approx. DC 25 mA.
Accessory Included
Operation Manual ........ 1 PC.
Optional
accessories
* Software ( Windows version ),
SW-U101-WIN
* RS232 cable, UPCB-01

3
3. FRONT PANEL DESCRIPTION
Fig. 1

4
3-1 Platform
3-2 CAL. Button ( function A Button )
3-3 Tare Button ( function B Button )
3-4 Display
3-5 Power Switch
3-6 Rubber Pads
3-7 Battery Cover/Compartment
3-8 DC 9V Receptacle
3-9 RS232 Output Socket
3-10 Unit Switch
4. PLATFORM INSTALLATION
Fig. 2

5
5. MEASURING PROCEDURE
As intend to let the balance under the best operation
condition, it recommend to warm up the balance at least
30 minutes before make the operation.
1) Place the balance on a flat hard surface.
2) Set the "g" or "oz" unit by slide the " Unit Switch "( 3-10, Fig. 1 ).
* The scale are set to the " g " unit typically.
* Use the "-" type screw driver to slide the " Unit Switch ".
* Slide the " Unit Switch " to the right position will set to
" gram " unit & the right down corner of LCD will show the
" g " marker.
* Slide the " Unit Switch " to the left position will set to
" oz " unit, but the LCD display will not show any marker.
3) Turn the " Power Switch " ( 3-5, Fig. 1 ) to the " On " position.
1 = On, 0 = Off
The " Display " ( 3-4, Fig. 1 ) will show " 8.8.8.8.8 " for a few
seconds, then " 0 " value ( 0.00 g for gram function, 0.000
for oz function ) will be present.
4) Apply the load to the platform gently, display will show
the measuring weight values.
* Do not exceed the over load capacity of the scale.
* Over weighting, the display will show "---------- ".
5) Tare function :
After weighting the first item, press " Tare Button " ( 3-3,
Fig. 1 ), scale will reset to zero values automatically.
At the same time, the LCD display will show the " TARE "
mark. Place next weighted item onto scale. Scale will
give weights of the second only.

6
Consideration of tare function
* If the display show minus weight or show "________ "
means the display reading is under the zero, then
tare function should be executed.
* Before measuring the weight, If the display is not
zero & show some value, it means the internal circuit
is over the zero, then tare function should be
executed.
* The max. tare capacity is approx. 1500 g.
* The " Tare " marker will disappear until power off
and power on again.
6. SELF-CALIBRATION
1) Please prepare the following optional " Standard Weight " :
500 gram standard weight ( optional ).
or 1000 gram standard weight ( optional ).
2) Calibration under the 1000 gram standard weight
a) Power on the scale until the display show zero value.
Apply the 1000 gram standard weight to the center of the
platform gently. If the scale is not accurate, then may
show the weight value around 1000 g ( for example 999.80 g
, 1000.2 g..... )
b) Step 1 :
Press the " CAL. Button " ( 3-2, Fig. 1 ) once,
display will show the value of " 500.00 g "
Step 2 :
Following press the " Tare Button " ( 3-3, Fig. 1 ) once,
display will show the value of " 1000.0 g "

7
Step 3 :
Press the " CAL. Button " ( 3-2, Fig. 1 ) once again,
display value of " 1000.0 g " will flash 6 times, then the
calibration procedures are finished completely & balance
is ready for the measurement accurately.
3) Calibration under the 500 gram standard weight
a) Power on the scale until the display show zero value.
Apply the 500 gram standard to the center of the
platform gently. If the scale is not accurate, then may
show the weight value around 500 g ( for example 499.75 g
, 500.25 g..... )
b) Step 1 :
Press the " CAL. Button " ( 3-2, Fig. 1 ) once,
display will show the value of " 500.00 g "
Step 2 :
Press the " CAL Button " ( 3-2, Fig. 1 ) once again,
display value of " 500.00 g " will flash 6 times, then the
calibration procedures are finished completely & balance
is ready for the measurement accurately.
Consideration of Self-Calibration :
* The internal Self-Calibration value is saved to the
internal EEPROM circuit permanently. Once power off then
power on, the calibration value will be not disappeared .
* After make the self calibration, measure the 500 g or 1000 g
standard weight again, if the display value existing few
counts deviation, it is normal. However within few hours,
the balance will be kept under a high accuracy condition.
Those accuracy will be even better than the published
specification ( refer page 2 ).
* Under the status of " oz " unit, still can use the weight of
500 g or 1000 g to make the calibration. However the " g "
marker will disappear.

8
7. COUNTING SCALE OPERATION
PROCEDURE
1) Prepare a lot of counting sample units. The no. of counting
sample will be 10 PCs, 20 PCs, 50 PCs or 100 PCs.
The more PCs of counting sample will be better.
2) Step 1 :
* No load to put on the platform.
* Use the finger to hold the " CAL. Button ( function A
Button ) " ( 3-2, Fig. 1 ), at the same time set the
" Power Switch " ( 3-5, Fig. 1 ) to the " On " position.
Until the display show " 0.00 ", then release the finger
away from " function A Button ".
3) Step 2 :
* Push the " function A Button " ( 3-2, Fig. 1 ) once a
while again, then the bottom left corner of LCD will
show the " COUNT " marker. At the same time the
LCD will show no. of sample units from 10, 20, 50, 100 in
sequence & changed per second.
* Put the counting sample units ( For example 10 PCs,
20 PCs, 50 PCs or 100 PCs ) on the platform.
* Until the display reach the no. of sample units exactly, for
example " 50 ", push the " function A Button "
( 3-2, Fig. 1 ) once a while. The display will flash
twice and freeze the sample counting no., then take away
the sample units. Now the balance is ready for counting.

9
Under the counting version if intend to change the
counting sample units, the new procedures are following :
a. Take away any load from the platform.
b. Push the " function A Button " ( 3-2, Fig. 1 ) once a
while. LCD will show no. of sample units from 10, 20,
50, 100 in sequence & changed per second.
c. Push the " Tare Button ", ( 3-3 Fig. 1 ) once.
d. Put the counting sample units ( For example 10 PCs,
20 PCs, 50 PCs or 100 PCs ) on the platform. Until the
display reach the no. of sample units exactly, for
example " 50 ", push the " function A Button " ( 3-2,
Fig. 1 ) once a while again. The display will flash
twice and freeze the set counting no., then take away
the sample units. Now the balance is ready for counting
& the sample counting units already change to new
value.
Consideration :
@ Under the counting function, 1 PC weight
should large than 2.5 g, other wise the result
of counting no. may existing some error.
@ The accuracy for the " counting no. " result are
always depend on the no. of " sample units " that
key in. We strong recommend that it can take
more sample units as possible, for example 50
PCs or more, then will get the best accuracy.
4) Step 3 :
* Take away the counting sample units away from
the platform, then put the new lot of units that
intend to be counted on the platform.
* The display will show the counting no. of the new
" sample units ".
Change to the new counting sample units

10
8. BATTERY REPLACEMENT
If battery is weak, LCD display will show " LO " indicator.
Every 5 second the " LO " indicator will flash one time.
This reminds user to replace new battery.
1) Open " Battery Cover " ( 3-7, Fig. 1 ) located at the bottom
of the scale.
2) According to the device instruction, place batteries ( 1.5V
AA size battery x 6 PCs ) into the battery compartment &
replace the battery cover.
9. DC 9V AC/DC ADAPTER OPERATION
(Adapter is optional accessory)
1) The scale will also be operated by the household ACV
power source (110/220/240 ACV) with a DC 9V AC/DC
Adapter ( capacity 300 mA).
2) Plug the jack from the Adapter into the " DC 9V
receptacle " ( 3-8, Fig. 1 ).
3) Now the scale is ready for ACV operation.
10. RS232 PC SERIAL INTERFACE
The instrument features an RS232 output via 3.5 mm
Terminal ( 3-7, Fig. 1).
The connector output is a 16 digit data stream which can be
utilized to the user's specific application.

11
220324-GM-1500P
Scale
(3.5 mm jack plug)
PC
(9W 'D" Connector)
Center Pin...................................................... Pin 2
Ground/shield......................................................Pin 5
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
An RS232 lead with the following connection will
be required to link the instrument with the PC
serial input.
The 16 digit data stream will be displayed in the following
format :
Each digit indicate the following status :
D0
End Word
D1 & D8
Display reading, D1 = LSD, D8 = MSD
For example :
If the display reading is 1234, then D8 to D1 is :
00001234
D9
Decimal Point(DP), position from right to the left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
D10
Polarity
0 = Positive 1 = Negative
D11 & D12
Annunciator for Display
g = 57
oz = 58
count = 30
D13
1
D14
4
D15
Start Word