Rice Lake MB Series User manual

MB Series
Precision Balance
Operation Manual
42192

Copyright © 2002 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
September, 2002
Contents
About This Manual ...................................................................................................................................1
1.0 Introduction ..................................................................................................................................1
1.1 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 General Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3 Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.4 Installation Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.5 Special Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.6 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.7 Turning the Balance On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.8 Turning the Balance Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.0 Simple Weighing .........................................................................................................................7
2.1 Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Changing Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.3 Weighing with a Tare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.4 Batching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.5 Removing the Tare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.0 Span Calibration ..........................................................................................................................9
4.0 Function Parameters ..................................................................................................................10
4.1 Function List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4.2 Viewing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.3 Changing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.0 Specifications ............................................................................................................................12
5.1 Model Specific Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5.2 RS-232C Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5.2.1 Pin Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5.2.2 RS-232C Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5.2.3 Output Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5.2.4 Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5.3 Connecting to a Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5.3.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5.4 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
6.0 Troubleshooting .........................................................................................................................16
7.0 Dimensions ................................................................................................................................17
MB Series Limited Warranty ..................................................................................................................19
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.rlws.com or obtained by
calling 715-234-9171 and asking for the training department.

ii MB Series Operation Manual

Introduction 1
About This Manual
The MB Series precision balance is an advanced precision weighing instrument incorporating a
highly-sophisticated electronic tuning fork sensor assembly capable of providing quick, reliable, and stable
weight measurement. This manual is intended to give users guidelines and specifications to ensure proper use
and care of the device.
1.0 Introduction
The MB Series balance contains extra features to provide optimum performance.
Features include:
• Three units of measure (grams [g], carats [ct], lb. or oz [
" ]. Model dependent)
•Virtually immune from external vibrations.
•Nowarm up time.
•Ultra-fast response time.
•Built-in automatic zero tracking.
• ABS injection molded plastic housing.
• Large .64 " (16.5mm) liquid crystal display (LCD).
•Optional glass breeze break (nominal capacities of 600g and below).
• Standard 115 VAC adapter. 230 VAC adapter optional.
•Optional RS-232C for interfacing with a printer or other peripheral equipment.
•Optional internal rechargeable battery (operates for 32 hours on one charge).
•Automatic shut-off (used with battery operation only).
Additional features include:
• Front panel controls
•Automatic sleep mode
•Generous weighing platform
•Five-year warranty
NOTE: Many AC adapters are available on the marketplace. If you should need to replace the AC adapter with this unit,
we recommend that you choose the RLWS AC adapter (PN 42566) designed for this unit. Use of any other AC adapter
can void the warranty.
1.1 Unpacking and Inspection
Each MB Series balance comes with the following components (see Figure 1-1 on page 2):
•Balance
•AC adapter
•Weighing platform
•Weighing platform support
•Unit of Measure (UOM) labels
Be sure all components have come with your MB Series balance.
NOTE: Store the packing material and box in a safe, easily accessible place. Should you ever need to transport the
balance across any substantial distance, using the original packing material is the first step to protecting your
investment.

2 MB Series Operation Manual
Figure 1-1. Main Component Parts of the MB Series
1.2 General Care and Maintenance
To keep your MB Series balance operating properly, the device needs to be maintained and cared for. Keep the
housing and platform clean by wiping them off with a soft damp cloth daily. If necessary, use a slight solution of
water and dishwashing soap to clean away stains and dirt. Check under the platform support area for any build up
of dirt and debris that could interfere with the mechanism. Keep your calibration masses in a safe, dry area.
Unplug the AC adapter when the device is not in use. For long term storage, remove the internal battery (if
equipped).
1.3 Installation Guidelines
For optimum performance, we recommend that you use your MB Series device in a clean, stable environment.
•Avoid environments that are excessively drafty.
•Avoid environments where temperature and/or humidity may change significally.
•Avoid environments where strong magnetic fields exist or near equipment that may generate a magnetic
field.
•Do not disassemble or modify the unit in any way.
•Do not move the balance when an item is on the weighing platform.
•Do not handle your balance with wet hands.
•Do not shock load or intentionally overload the device.
•Do not leave the device exposed to direct sunlight.
•Do not use any solvents on the device.
•Do not use in an excessively dusty environment.
1.4 Installation Steps
Use the following steps to properly install the MB Series balance.
1. Inspect the leveling legs and ensure that they are all completely retracted.
2. Place the balance down on a firm, level mounting surface.
ZERONET
RICE LAKE
MB
ON
OFF
PS
ZERO
F
lb oz
Weighing Platform
(both styles)
Level Indicator
Display
Leveling Leg
AC Adapter
Adapter
Connector
Output Connectors
for Optional Equipment
lb./oz. labels
(blown up in size)
Platform Support
NOTE: long support
arms face front.

Introduction 3
3. Using the bubble level at the front right of the display panel as a guide, adjust the leveling legs as
necessary until the bubble is centered inside the bulls-eye of the bubble level. (See Figure 1-2).
Figure 1-2. Level Adjustment
4. Plug the AC adapter into the back of the unit (see Figure 1-3).
Figure 1-3. AC Adapter Connection
5. Secure the weighing pan support onto the device. Be sure that the long support arms face the front of the
balance. Tighten the adjusting knob until it is finger tight. Do not use a screwdriver (see Figure 1-4).
Figure 1-4. Attach Weighing Pan Support
6. Place the platform cover down over the weighing pan support (see Figure 1-1 on page 2 for exploded
view).
7. Plug the AC adapter into a suitable wall outlet. Observe the display. If power has been successfully
connected to the device, a small asterisk appears in the upper left-hand corner of the display (see
Figure 1-5 on page 4).
LEVELING LEG
BALANCE IS LEVEL
BLUE
CIRCLE
BUBBLE
BALANCE IS NOT LEVEL
Adjusting
Knob
ZERONET
RICE LAKE
MB
ON
OFF
PS
ZERO
F

4 MB Series Operation Manual
Figure 1-5. AC Power Indicator
8. Install the unit of measure label (either "lb" or "oz") in place as shown in Figure 1-6. Models with a
maximum weighing capacity
≤ 1500g use the "oz" label. All others use the "lb" label. See Table 2-1 on
page 7 for additional information.
Figure 1-6. lb/oz Label Placement
1.5 Special Information
The MB Series balance is a sensitive, precision weighing instrument and should always be treated with care.
While every attempt is made prior to shipping to ensure that your balance arrives ready-to-use, uncontrollable
events during the shipping process may make it necessary to calibrate the device before being used.
While not absolutely necessary, we recommend that you perform a span calibration prior to using the balance for
the first time. Review Section 2.0 on page 7 for instructions on this important feature.
In the event that the device fails to operate properly, contact your Rice Lake Weighing Systems dealer for
assistance.
1.6 Front Panel
Figure 1-7 shows the MB Series keypad and key functions and Figure 1-8 on page 5 shows the LED display
segments.
Figure 1-7. Front Panel Keypad
ZERO NET
ON
OFF
PS
ZERO
F
Turns scale on or off.
Print key, or data transmission key.
Set key - used to finalize
parameter settings.
Function key - in weighing mode, used
to select display unit of measure. In
calibration mode, used to select operational
parameters.
Zero key - press and release
to return the device to zero or to enter
a tare. In calibration mode, used to select
a parameter within a function.

Introduction 5
Figure 1-8. MB Series Display Segments
1.7 Turning the Balance On
Press and release the
ON/OFF
key to power up the MB Series balance.
1. All display segments momentarily illuminate.
2. The word “ADJ” momentarily illuminates.
3. The device performs a display check.
4. Display goes to default weighing mode.
0F
ZERO NET
LOW
M
Indicates default weighing mode in grams
ct Indicates weighing mode in carats
Indicates weighing mode in
lb or oz (dependent on model)
See Table 2-1
Indicates the battery charge is low
Not used
Indicates the amount of overall capacity now being consumed
by the current weighment, including the tare value.
Indicates a negative
weighing value
Indicates that the scale is energized through the
AC adapter (active only when the device is turned off)
Indicates that the device is at its true mechanical zero
Indicates that a tare has been entered and the
value of the weight shown is a net value
(For example: gross - tare = net)
Indicates that the device is
in motion and the weight
reading is not final
0F
ZERO NET
LOW
M
ct
ZERO NET
0F
ZERO NET
LOW
M
ct
0F
ZERO NET

6 MB Series Operation Manual
1.8 Turning the Balance Off
To turn the balance off, press and release the
ON/OFF
key. The display turns off and the power status asterisk
appears if the unit is connected to the AC adapter (see Figure 1-5 on page 4).

Simple Weighing 7
2.0 Simple Weighing
2.1 Units of Measure
To scroll through the available units of measure, simply press and release the
F
key. Table 2-1 shows unit
capacities.
Table 2-1. Unit Capacities
2.2 Changing Units of Measure
1. Turn the balance on (see Section 1.7 on page 5).
2. The device displays default weighing mode. If the balance does not show a
0.0
value after the normal
start sequence, press and release the
ZERO
key.
3. The default unit of measure is “g” (grams).
•To change the unit of measure to “ct”, press and release the
F
key.
•To change the unit of measure to “lb” or “oz”, press and release the
F
key again.
•To return to the default unit of measure “g”, press the F key again.
4. Gently place the item to be weighed on the platform. When the in-motion illuminator disappears, the
device is stable and you can read the weight value. Additionally, via the capacity graph at the top of the
display, you can see the relationship between the weight of the commodity and the nominal capacity of
your MB unit. This unique feature helps to ensure that you do not overload the device.
2.3 Weighing with a Tare
1. Turn the balance on (see Section 1.7 on page 5).
2. The device displays default weighing mode. If the balance does not show a
0.0
value after the normal
start sequence, press and release the
ZERO
key.
3. The default unit of measure is “g” (grams). To change the unit of measure, see Section 2.2.
4. Gently place the item to be weighed on the platform. When the in-motion illuminator disappears, the
device is stable and you can read the weight value. Additionally, via the capacity graph at the top of the
display, you can see the relationship between the weight of the commodity and the nominal capacity of
your MB unit. This unique feature helps to ensure that you do not overload the device.
NOTE: The value of the original tare must be ≥ 1.5% of the nominal value of the device. If the original tare value
is < 1.5% of the nominal value of the device, the NET indicator does not illuminate and the tare function is not
available.
5. Press the
ZERO
key. The zero display appears and the
NET
indicator illuminates.
6. Place the product in the container. When the in-motion illuminator disappears, the device is stable and
you can read the NET weight value of the commodity in the container. Additionally, via the capacity
graph at the top of the display, you are able to view the relationship of the entire gross weight (for
example: commodity + tare) to the nominal capacity of the MB unit. This helps prevent overloading of
the device.
NOTE: To view the gross weight of the commodity and the tare, remove the container with its contents from
the weighing platform. The total weight is displayed as a negative number. To return to normal weighing,
replace the container with its contents on the platform.
7. If you wish to remove the product or to return the display to zero, press the
ZERO
key.
Unit of
Measurement MB-150S MB-150E MB-300E MB-600P MB-1500E MB-3000E MB-6000P
Gram (g) 150 x 0.001 150 x 0.01 300 x 0.01 600 x 0.01 1500 x 0.1 3000 x 0.1 6000 x 0.1
Carat (ct) 750 x 0.005 750 x 0.05 1500 x 0.05 3000 x 0.1 7500 x 0.5 15,000 x 0.5 30,000 x 1
Pound (lb)
—————
6.6 x 0.0002 13 x 0.0005
Ounce (oz) 5.2 x 0.00005 5.2 x 0.0005 10 x 0.0005 21 x 0.001 52 x 0.005
——

8 MB Series Operation Manual
2.4 Batching
1. Turn the balance on (see Section 1.7 on page 5).
2. The device displays default weighing mode. If the balance does not show a
0.0
value after the normal
start sequence, press and release the
ZERO
key.
3. The default unit of measure is “g” (grams). To change the unit of measure, see Section 2.2.
4. Gently place the item to be weighed on the platform. When the in-motion illuminator disappears, the
device is stable and you can read the weight value. Additionally, via the capacity graph at the top of the
display, you can see the relationship between the weight of the commodity and the nominal capacity of
your MB unit. This unique feature helps to ensure that you do not overload the device.
NOTE: The value of the original tare must be
≥ 1.5% of the nominal value of the device. If the original tare value
is < 1.5% of the nominal value of the device, the NET indicator does not illuminate and the tare function is not
available.
5. Place the product in the container. The net weight is displayed.
NOTE: To view the gross weight of the commodity and the tare, remove the container with its contents from the
weighing platform. The total weight is displayed as a negative number. To return to normal weighing, replace
the container with its contents on the platform.
6. Without removing the product, press the
ZERO
key.
7. Gently add the next product quantity. Only the additional amount is displayed.
8. Repeat steps 5-7 as necessary.
2.5 Removing the Tare
1. Remove the container (empty or full) from the weighing platform.
2. The display shows the weight of the container and the commodity, if any, as a negative value.
3. Press and release the
ZERO
key.
4. The display returns to a 0.0 value.

Span Calibration 9
3.0 Span Calibration
To achieve the optimum accuracy from your MB Series balance, it should be calibrated on a regular basis in the
environment that it is normally used. If the device is moved to another physical environment, recalibrate the
device before using it.
After properly performing the installation guidelines (see Section 1.3 on page 2), perform the following
calibration steps.
1. Turn balance on (see Section 1.7 on page 5).
2. Have ASTM Class 4 test weights available equal to the nominal capacity of the device.
3. Ensure that there is no load on the platform.
4. Ensure that the device is level and on a stable surface, free from environmental changes.
5. Press and hold the
F
key until the word
CAL
appears. As you press and hold the
F
key for approximately
2 seconds, the word
FUNC
appears. The word
CAL
appears after two additional seconds.
6. Release the
F
key. If you hold the
F
key down too long, the unit returns to the default weighing mode.
Simply start over at step 1.
7. Press and hold the
ZERO
key. While holding down the
ZERO
key, press and release the Fkey, releasing
the ZERO key at the same time. (If you hold down the ZERO key longer than two seconds, the device
automatically defaults to the weighing mode. Simply restart the calibration process at step 1).
8. The device momentarily displays a pulsating on 0, indicating an automatic calibration of true mechanical
zero.
9. After zero calibration, the device automatically changes to read on FS.
10. Place a load equal to the nominal capacity of the device on the center of the platform.
11. The on FS display pulsates, indicating that the device is electronically calibrating a full scale load
equivalent to the nominal capacity of the device.
12. When calibration is complete, the device automatically displays the calibrated nominal capacity of the
balance.
13. Remove the test load from the balance.
14. The device automatically returns to a 0.0 value and the default weighing mode.
In some rare cases, automatic calibration may not be possible. In the event of an error message during
calibration, please refer to the table below for the appropriate corrective action.
Error Message Problem Solution
O-ERR Calibration load is in excess of the nominal capacity of the
device Change the test load so that it is equal to the nominal capacity of the device
1-ERR Calibration load is less than 1/2 of the nominal capacity of the
device Increase the test load so that it is equal to the nominal capacity of the device
2-ERR Data error is in excess of 0.4% of the rated capacity Contact your RLWS dealer
Table 3-1. Possible Calibration Process Error Messages

10 MB Series Operation Manual
4.0 Function Parameters
The parameter menu allows you to activate or deactivate such features as the capacity graph, zero-tracking, and
auto power off (only when optional battery is installed). Additional parameters include display update, data
output, output speed (applies to RS-232C equipped units only), and units of measure. The following section
details the various parameters and the process for viewing them.
4.1 Function List
Table 4-1. Function List
NOTE: Bold type indicates factory setting.
Display Setting Function Description
1.bG
0 Bar Graph Bar graph is not displayed.
1 Bar graph is displayed.
3.AO 0 Zero Tracking Zero tracking is off.
1 Zero tracking is on.
4.AP 0 Auto Power Off Auto-power is off.
1 Power turns off after three minutes (only with optional battery installed).
5.rE
1 Display Update Fast
2 Medium
3 Slow
6.oc
0 Printer Control
(availableonlywhen
optional RS-232 is
installed)
Interface is off. No printing available.
1 Automatic, continuous printing of zero display and unstable and stable weighing
values.
2 Automatic, continuous printing of stabilized data only (for example: stable zero
value and stable weight value).
3Pushbutton printing from balance Pkey of stable zero value and stable weight
value.
4 Auto-printing of stabilized weight value only.
5 Auto-printing of stabilized zero value and stabilized weight value.
6Auto-printing of any weight display whether stable or unstable. One transmission
each value.
7 Pushbutton printing from balance P key of stable zero value and stable
weight value (same as setting 3 above).
7.bL 1Baud rate (available
only when optional
RS-232 is installed).
1200 bps
2 2400 bps
3 4800 bps
8.SEt1Weight unit “g” only.
2 “g” and “ct” selectable from front keypad.
3 “g” and “oz” selectable from front keypad (except MB-3000 and MB-6000P).
“g” and “lb” selectable from front keypad (MB-3000 and MB-6000P only).
4“g”, “ct” and “oz” selectable from front keypad (except MB-3000 and MB-6000P).
“g”, “ct” and “lb” selectable from front keypad (MB-3000 and MB-6000P only).
A.Pr.F.
1 Not used Not used
2
3

Function Parameters 11
4.2 Viewing Parameters
1. Turn the balance on (see Section 1.7 on page 5).
2. If the device does not show a 0.0 value after the normal start sequence, press and release the ZERO key.
3. Press and hold the Fkey until the display reads FUNC.
4. Immediately release the Fkey.
NOTE: If you hold the F key down too long, the display changes from FUNC to CAL. Simply press and release
the F key to return to the default weighing mode and return to step 3.
5. When you release the Fkey, the display reads 1.bg.1 (see Table 4-1 on page 10). This indicates that the
display bar graph is activated in the default weighing mode.
6. Press and release the Fkey again to advance to the next parameter display. Compare the information in
the display to the information in Table 4-1 on page 10.
7. Continue to press and release the Fkey to scroll through each of the parameter function displays.
Figure 4-1. Function Parameters
8. When you press and release the Fkey after the last parameter, the device returns to the default weighing
mode.
4.3 Changing Parameters
1. Turn the balance on (see Section 1.7 on page 5).
2. Ensure there is no load on the platform.
3. If the device does not show a 0.0 value after the normal start sequence, press and release the ZERO key.
4. Press and hold the Fkey until the display reads FUNC.
5. Immediately release the Fkey.
6. If you hold the Fkey down too long, the display changes from FUNC to CAL. Press and release the Fkey
to return to the default weighing mode and return to step 4.
7. When you release the Fkey, the display reads 1.bg.1.
8. Using Table 4-1 on page 10 as a guide, scroll to the function you wish to change by repeatedly pressing
the Fkey.
9. Once the function you wish to change is displayed, repeatedly press the ZERO key until the parameter
you wish to use is displayed.
10. If you wish to continue on to another function, return to step 8.
11. If you do not wish to change another function, press the Skey to return to the weighing mode.
FP
ON
OFF
S
ZERO
7. L. 1
Baud Rate
6.OC. 7
Output Control *
5.RE. 2
Response Speed
8.SET. 1
Weight Unit
1. G. 1
Bar Graph
3.A0. 1
Zero Tracking
4.AP. 1
Auto-power Off
➩➩
➩➩
➩
➩
FP
ON
OFF
S
ZERO
FP
ON
OFF
S
ZERO
FP
ON
OFF
S
ZERO
FP
ON
OFF
S
ZERO
FP
ON
OFF
S
ZERO
FP
ON
OFF
S
ZERO
*Only applies when device
is RS-232 equipped.

12 MB Series Operation Manual
5.0 Specifications
This section contains tables listing common specifications and model specific data for the MB Series scale.
5.1 Model Specific Data
* Recommended ASTM Class 4.
Model
RLWS Part Number MB-150S 66742 MB-150E 66741 MB-300E 66743 MB-600P 66744 MB-1500S 67025 MB-1500E 66745 MB-3000E 66746 MB-6000P 66747
Gram (g) 150 x 0.001 150 x 0.01 300 x 0.01 600 x 0.01 1500 x .01 1500 x 0.1 3000 x 0.1 6000 x 0.1
Carat (ct) 750 x 0.005 750 x 0.05 1500 x 0.05 3000 x 0.1 7500 x 0.05 7500 x 0.5 15000 x 0.5 30000 x 1
Decimal ounces (") 5.2 x
0.00005 5.2 x 0.0005 10 x 0.0005 21 x 0.001 52 x 0.0005 52 x 0.005 ——
Decimal pounds (")— — — —— —6.6 x 0.0002 13 x
0.0005
Tare range 1.5% full scale to full scale
Percentage of
minimum division 0.25 0.05 0.1 0.2 0.2 0.05 0.1 0.2
Linearity ±0.005 ±0.01 ±0.01 ±0.02 ±0.01 ±0.1 ±0.1 ±0.2
Repeatibility/Standard
Dev. ±0.003 ±0.01 ±0.01 ±0.02 ±0.01 ±0.1 ±0.1 ±0.2
Sensitivity drift ±8
Pan size (mm) 110∅140∅170 x 142 170 x 142 170 x 142
Pan size (in) 4.3∅5.5∅6.7 x 5.6 6.7 x 5.6 6.7 x 5.6
Physical dimensions
(mm) See Figure 7-1
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-3
on page 18
See
Figure 7-3
on page 18
See
Figure 7-3
on page
18
Physical dimensions
(in) See Figure 7-1
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-2
on page 17
See
Figure 7-3
on page 18
See
Figure 7-3
on page 18
See
Figure 7-3
on page
18
Display 0.64“ (16.5mm) 6-digit LCD
Shipping weight (lb) 6 6 6 6 7 7 7 7
Admissable RH% 80% (max)
Admissable ambient
temp 0° - 40° C
Calibration method Semi-automatic, external calibration with reference weight
Calibration mass (g) 150 150 300 600 1500 1500 3000 6000
Power 120/220 VAC (via AC Adapter) 50/60 Hz
Accessories included 120 VAC Adapter, Operating Instructions
Table 5-1. Model Specific Data

Specifications 13
5.2 RS-232C Specifications
The MB Series may be equipped with an optional RS-232C feature (PN 42175), which is compatible for
communication with printers and computers. When the balance is connected directly to a printer, displayed data
can be output either via the Pkey on the balance, or automatically when certain conditions have been met. Refer
to Table 4-1 on page 10 for a list of parameters available.
NOTE: The optional battery pack (PN 42169) can not be used with the RS-232C option.
5.2.1 Pin Function
Figure 5-1. RS-232 Connector Schematic
5.2.2 RS-232C Commands
All communication is accomplished using standard ASCII format. Only the characters shown in the following
table are acknowledged by the balance. Any other commands, control characters or spaces are ignored.
Commands sent to the balance must be terminated with a carriage return (CR) or carriage return-line feed
(CRLF). Transmission to the device is free from output timing from the device because the system is full-duplex.
If the command is properly received, the balance transmits an acknowledgement (ACK, code 06H). If the
command is erroneous, the balance transmits non-acceptance (NAK, code 15H). In the default display modes of
the balance, ACK or NAK is acknowledged within one-second after transmission of the command. When
controlling other operations of the balance such as function parameters, unit of measure, or calibration, ACK or
NAK is replied after the operation of the balance is completed. Do not send additional commands prior to
receiving a response.
Input format command consists of four (4) words, including terminators (CR=0DH) (LF=0AH) as follows:
External tare command is as follows:
Pin Number Signal Output/Input Function
1 N/A N/A N/A
2 DTR Output High level with scale power “ON”
3 RXD Input Receiving data
4 TXD Output Transmission data
5 GND N/A Signal ground
Table 5-2. RS-232C Pin Function
1234
C1 C2 CR LF
C1 C2 CODE Contents
Tsp54h 20H Tare Command
Printer
side
Balance
side
Pin 1
Pin 4
Pin 2
Pin 5
Pin 3
NOTE: Printer side of connector
to show correct pin number
orientation.

14 MB Series Operation Manual
5.2.3 Output Control Settings
NOTES:
• The performance of both output controls, by commands 00-07 and by the parameter settings (see Table 4-1 on
page 10) are exactly the same.
• Once any command is performed, the status is kept until the next command is input. However, once the power is
turned off, the output control status returns to the primary function status setting.
5.2.4 Interface Specifications
5.3 Connecting to a Computer
Connecting the balance to a computer enables you to operate the balance from the computer as well as receive
data such as displayed weight and unit of measure. The following sections describe the hardware and output
signal formats provided with the balance.
5.3.1 Hardware
On the rear of the MB Series balance equipped with the optional RS-232C interface is a 5-pin DIN connector for
interfacing to other devices (see Figure 5-2).
C1 C2 Code 1 Code 2 Contents
00 4FH 30H Interface off, no printing available
01 4FH 31H Automatic continuous printing of zero display, unstable and stable weighing values
02 4FH 32H Automatic continuous printing of stabilized data only (for example, stable 0value and
stable weight value)
03 4FH 33H Pushbutton printing from balance Pkey of stable 0 value and stable weight value
04 4FH 34H Auto-printing of stabilized weight value only
05 4FH 35H Auto-printing of stabilized zero value and stabilized weight value
06 4FH 36H Auto-printing of any weight display whether stable or unstable, one transmission each
value
07 4FH 37H Pushbutton printing from balance Pkey of stable 0value and stable weight value
00 4FH 30H
Table 5-3. Ouput Control Settings
Item Specification
Transmission Method RS-232C Serial Data, Random Access
Transmission Speed 1200/2400/4800 bps; user selectable; see Table 4-1 on page 10
Transmission Code ASCII; 8-bit
Signal Level EIA RS-232C;
High Level - Data logic “0” + 5VDC to +15VDC
Low Level - Data logic “1” -5VDC to -15VDC
Contents of Word 8-bit word based on ASCII standard character codes; 1 start bit; 2 stop bits; no parity bit
Parity bit Nil
Table 5-4. RS-232C Interface Specifications

Specifications 15
The balance does not output any data unless pin 2 is held in an ON state (+5VDC to +15VDC). Interfaces
requiring the CTS handshake may tie pins 5, 4, and 8 on the computer side to defeat it.
Figure 5-2. Connection to a Computer
5.4 Accessories
RLWS Part Number Description
42566 115 VAC Adapter for QB/MB Series Balances
42168 230 VAC Adapter for MB/QB Series Balances
42169 Internal rechargeable battery for MB Series (incompatible with PN 42175 below)
42175 RS-232C interface for MB Series (incompatible with PN 42169 above) includes DIN-5 pin connector
(Cable not included)
42179 Glass breeze break for MB Series (scales with round weighing pans only)
42183 Carrying case for MB Series balances
42192 Additional operating manual
44701 In-use cover for MB Series balance
Table 5-5. MB Series Balance Accessories
TXD 2
RXD 3
GND 7
DCD 8
RTS 4
3 RXD
4 TXD
5 GND
2 DTR
1
DB-25
Connection
CTS 5
DSR 6
DTR 20
DIN-5
Balance
Connections
Jump pins
8, 4, and 5
Jump pins
6 and 20

16 MB Series Operation Manual
6.0 Troubleshooting
The following section contains a troubleshooting chart for the MB Series scale. Refer to this chart to locate
causes and corrective actions to various conditions.
Table 6-1. Troubleshooting Chart
Condition Cause Corrective Action
Display does not
stabilize. •Wind or vibration is affecting scale. • Set up balance elsewhere or under a
protective hood.
•Scale is set on unstable surface. • Set the scale on a firm surface that is free
from vibrations.
• Span is out of calibration. • Level the scale.
• Perform span and zero adjustment.
Displayed value is in
error .
Weight value is drifting.
•Tare value entered incorrectly. • Clear and re-enter tare value.
• Balance is not set level. • Set balance level.
• Span is out of calibration. • Perform span adjustment.
Linearity
error. •Mechanical adjustment has changed. • Consult your local Rice Lake Weighing
Systems Service distributor.
Display is blank. • Adapter is not connected.
• Battery needs recharging.
• Auto Power OFF is activated.
•Connect AC adapter to the scale and 120
VAC outlet.
• Recharge battery .
•Press the ON/OFF.
Balance does not weigh
to nominal capacity. •Tare + sample weight exceeds capacity.
•(Weight range = maximum capacity -
tare weight).
•Add the individual weights of the tare and
the commodity to determine if together they
are more than the nominal capacity of the
device.
b - ERR
D-ERR
•Electronic malfunction due to static
electricity electromagnetic interference. •Consult your local Rice Lake Weighing Systems distributor.
0 - ERR •Capacity is exceeded. • Use a test mass to ensure the balance can
weigh to its rated capacity.
•Ensure that the commodity being weighed
is not in excess to the nominal capacity of
the balance.
•Consult your local Rice Lake Weighing
Systems distributor.
1 - ERR •The calibration weight is less than 1/2
full capacity. •Reinitiate calibration with a test mass equal to the nominal capacity of the balance.
•Consult your local Rice Lake Weighing
Systems distributor.
2-ERR • The data error exceeds 0.4%.
• Defective weighing mechanism. •Consult your local Rice Lake Weighing
Systems distributor.
3-ERR
4-ERR
•Calibration has started with a load on
the platter. •Remove load and reinitiate calibration process.
•Consult your local Rice Lake Weighing
Systems distributor.
U - ERR •Material wedged underneath the
platform support plate. •Remove platform and platform support plate. Clean and reassemble.