Adam Equipment CQT 202 Assembly instructions

@Adam Equipment Company 2011
Adam Equipment
CQT Service
ADAM EQUIPMENT CO. LTD.,
revA, January 2011

@Adam Equipment Company 2011

©Adam Equipment Company 2011
1
CONTENTS
1CQT FEATURES ............................................................................................ 3
2CQT SPECIFICATIONS................................................................................... 3
3INTRODUCTION .......................................................................................... 4
4REMOVING THE COVER ............................................................................... 5
5LOAD CELL DAMAGE.................................................................................... 5
5.1 5.1 A/D COUNTS ................................................................................ 5
6PRINCIPLE OF OPERATION ........................................................................... 7
7DEALER PARAMETERS .......................................................................... 8
7.1 FILTER.............................................................................................. 8
7.2 ZERO TRACKING RANGE............................................................... 8
7.3 LINEARITY CALIBRATION POINT................................................... 8
7.4 LINEARITY CALIBRATION AMEND VALUE .................................... 9
7.5 CAPACITY ........................................................................................ 9
7.6 DIVISION .......................................................................................... 9
7.7 CALIBRATION WEIGHT................................................................... 9
7.8 CALIBRATION ................................................................................ 10
8ERROR MESSAGES ..................................................................................... 10
9TROUBLE SHOOTING GUIDE ............................................................... 12

©Adam Equipment Company 2011
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©Adam Equipment Company 2011
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1 CQT FEATURES
•Auto hut off
•Auto zero tracking
•Auto backlight (optional)
•Low battery indication
•Kg/g/lb/oz/ct/dr/GN/N/tl.t conver ion
•Large LCD (6 digit 18 mm high)
•Large quare SS pan
•Net weight/ tability indication
•Auto calibration
2CQT SPECIFICATIONS
Model # CQT-202 CQT- 251 CQT-601 CQT-1501 CQT-2601 CQT-2000 CQT-5000
Maximum
Capacity 200g 250g 600g 1500g 2600g 2000g 5000g
Readability 0.01g 0.1g 0.1g 0.1g 0.1g 1g 1g
Re olution 1:20000 1:2500 1:6000 1:15000 1:26000 1:2000 1:5000
Repeatability
(Std Dev) 0.02g 0.1g 0.1g 0.2g 0.2g 1g 1g
Linearity ± 0.02g 0.1g 0.1g 0.2g 0.2g 1g 1g
Unit of
Mea ure kg / g / lb / oz / ct / dr / GN / N/tl.t
Stabili ation
Time 3 econd 2 econd 3 econd 2 econd
Operating
Temperature
0ºC to 40ºC
32ºF to 104ºF
Power Supply 12VAC @ 150mA adapter or 6x AA batterie
Calibration Pu h button calibration u ing external ma
Calibration
Ma
100g/
200g
100g/
200g
200g/
400g
/600g
500g/
1000g/
1500g
1000g/
2000g
1000g/
2000g
1000g/300
0g/5000g
Di play 6 digit LCD, 18mm digit , with backlight
Draft hield
(diameter x h)
132mm ø x 82mm
(5.2” ø x 3.2”) N/A
Balance
Hou ing ABS Pla tic
Pan Size 120mm ø (5.1” ø) 145mm ø (5.7” ø)
Overall
Dimen ion
(w x d x h)
173 x 255 x 86mm (6.8” x 10” x 3.3”)
Without draft hield
Net Weight 820g (1.8lb)

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3INTRODUCTION
The cale are all ba ed on re i tance train gauge load cell . The load
cell output a mall voltage in re pon e to a load placed on the weighing
platform. The voltage i in the range of approximately 10mv for a full
capacity load.
The ignal from the load cell i pre ented directly to an A/D converter for
conver ion to a digital value for u e by the microproce or.
It may be nece ary to replace a load cell if it i damaged.
The load cell connection are:
Before any change are made to the cale, it will be nece ary to
trouble- hoot the problem and determine the be t method to olve the
problem . Refer to the Trouble- hooting Guide for ugge tion .
High Re olution cale
CQT 202,1501 & 2601
Signal - Black
Signal + Green
Shield Yellow
Ext - White
Ext + Red
Low Re olution cale
All other
Signal - White
Signal + Green
Ext - Black
Ext + Red

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4 REMOVING THE COVER
If it become required to remove the cover, you hould be very careful
a pulling or pre ing on the load cell during thi procedure can damage
it very ea ily.
When removing the crew (4 mall crew below the cale) hold the
cover to the ba e and en ure not to pre on the balance ca e a the
load cell can be damaged. The load cell i attached to the ba e.
The load cell are protected by overload and under-load top . The e
top are either plate that contact the cover or crew that are
acce ible from the out ide of the cale .
Refer to the Trouble- hooting Guide for the po ible cau e of any
problem.
5LOAD CELL DAMAGE
5.1 5.1 A/D COUNTS
Pre [Unit] fir t and then pre [On/Off], while keeping the [Unit] key
pre ed to enter the dealer parameter . The di play will how the
ver ion number and then reque t pa word .
Pre [Unit],[Unit], [T re], [Unit], [Unit] in equence to enter the etting
mode.
Pre the [Unit] key everal time until you enter the calibration etting .
Then you can ee the A/D count.
To ee the every divi ion A/D count ,for example: the CQT202 with the
readability 0.01g.
Fir t record the current A/D count, e.g 43860, then put on the 1g weight
to ee the new A/D Count ,eg:44198. So the divi ion A/D count i
(44198-43860)/100=3.38. The count hould bigger than 3.

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If the divi ion A/D count are out ide thi range or cannot be een then
it will be nece ary to trouble hoot the load cell, load cell connection
to verify the load cell i working correctly and ha not been damaged.
The mo t common rea on for a cale to fail i that the load cell ha been
damaged. The damage can be due to two primary cau e . The fir t i
the phy ical damage due to an overload or an impact from the ide and
the econd i damage due to the environment, uch a moi ture,
extreme heat or a cut cable if the cable are expo ed.
With the CQT cale it i po ible the load cell i damaged uch that the
cale till operate when the cale i calibrated but not when a mall
ma i put on the pan. Thi will become apparent when the cale read
correctly at the calibration ma but i not correct at lower ma e . The
cale may till zero OK after power i applied but it will not regi ter a
weight value for maller weight .
Check the A/D count in thi ca e.

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6PRINCIPLE OF OPERATION
The train gauge load cell i a method of mea uring the amount of tre
put onto a metal tructure due to a weight being upported by the
tructure. The tre i mea ured u ing 4 train gauge en or mounted
in a particular way on the metal tructure.
The e 4 train gauge are connected in uch a way that they form a
Wheat tone bridge. See the figure below. In the imple t load cell
there are only the 4 re i tance of the train gauge to con ider.
Normally without a load on the load cell, all the re i tance are the
ame. However, when the load cell ha a weight on it, two of the train
gauge will be in compre ion (A and D) and the re i tance will decrea e
and the other two will be in ten ion (B and C) and their re i tance will
increa e.
350 ohm
350 ohm
350ohm
350ohm
AB
CD
+E
-S
-E
+S
BALANCED BRIDGE
10 VOLT POWER
SUPPLY
Vout = O VOLTS,
BETWEEN +S AND -s
351ohm
349ohm
351ohm
349ohm
AB
CD
+E
-S
-E
+S
UNBALANCED BRIDGE
FULL CAPACITY LOAD
ON THE LOAD CELL
10 VOLT POWER
SUPPLY
Vout = 0.028 VOLTS (28mv),
BETWEEN +S AND -s
Thi will cau e the bridge to become unbalanced. When the bridge ha a
voltage acro it from +E to -E then the ignal output at +S and -S will
how a voltage of zero volt with no load and a mall voltage
proportional to the load a the load i increa ed. Typical load cell how
10mv of ignal if the excitation voltage i 5volt and the load cell i fully
loaded.
To check the load cell, apply power to the cale and mea ure a voltage
between the S+ and S- wire when de- oldered from the PCB. The
voltage hould be le than 2millivolt with no load on the cale,
increa ing a the load i applied. The voltage between the E+ and E-
wire hould be 5V.

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7 DEALER PARAMETERS
•Pre [Unit] fir t and then pre [On/Off], while keeping the
[Unit] key pre ed to enter the dealer parameter . The
di play will how “Cqt-1.0 Cqt” “080410 Cqt” and then
reque t pa word .
•Pre [Unit], [Unit], [T re], [Unit], [Unit] in equence to
enter the etting mode.
7.1 FILTER
•The di play how “Cqt-1.0 Cqt”and“080410 Cqt”, 1 econd
later the balance will enter filter etting and the LCD will
how “X FIL”. “X” i the value for the amount of filtering to
be done. Set a value of 1 to 6. A larger number i more
filtering and a lower re pon e. Default i “1”.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter zero tracking range
etting.
7.2 ZERO TRACKING RANGE
•When enter zero tracking range etting, the di play will
how “X ZEO”. X i the value for the amount of auto-zero
range. Set a value of 1 to 7. A larger number i a larger
range. Default i “1”.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter linearity calibration point
etting.
7.3 LINEARITY CALIBRATION POINT
•Thi function mean etting a point to u e in linearity
calibration.
•When enter linearity calibration point etting, the di play
will how “X LID”. “X” i the value for point number. Set a
value of 0 to 5. “0” mean the point i at 1/3 of capacity, “1”
i 1/2, “2” i 2/3, “3” i 5/6, “4” i 6/7, “5” i 1. Default i
“0”.
•Pre [T re] key to croll through the option .

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•Pre [Unit] to confirm and enter linearity calibration
amend value.
7.4 LINEARITY CALIBRATION AMEND VALUE
•Thi function mean etting a linearity calibration amend
value.
•When enter linearity calibration amend value, the di play
will how “X LIN”. “X” i the value for point number. Set a
value of -8 to 8. Default i “0”.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter
7.5 CAPACITY
•When enter capacity etting, the di play will how “XXXX
CAP”. “XXXX” i the value of the balance capacity. Set a
value of 100g to 6000g.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter divi ion etting.
7.6 DIVISION
•When enter capacity etting, the di play will how “X.X
CAP”. “X.X” i the value of divi ion. Set a value of 0.002g to
5g. The divi ion you cho e mu t be no le than 1/30000 of
capacity.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter calibration weight etting.
7.7 CALIBRATION WEIGHT
•When enter calibration weight etting, the di play will how
“XXX WEI”. “XXX” i the value of weight.
•Before calibrating it i nece ary to have the proper
calibration weight . The weight hould be known to an
accuracy that i appropriate for the balance being
calibrated, for example, OIML Cla M1 type or ASTM E617
Cla 4. If you do not have proper weight do not attempt
calibration.
•Plea e choo e the weight refer to the form below:

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•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter calibration weight etting.
7.8 CALIBRATION
•Before enter calibration, plea e make ure the pan i empty.
•When enter calibration, the di play will how “XXXXX CAL”.
“XXXXX” i the AD value.
•IF etting for a new PCB it i nece ary to pre [T re] to et
the ADC fro a gain of 64 or 128. Set to 128 for the CQT
202,1501 & 2601 or 64 for the other . Pre the [Unit] key.
•When the AD value i tabile, pre [Unit] key, then “0 LOD”
will be howed on the LCD.
•Put the calibration ma on the pan. The di play will how
“XXXXX LOD”. “XXXXX” i the AD value of the ma . When the
value i tabile, pre [Unit] key.
•Now calibration i down. The balance will turn to normal
weighting.
8ERROR MESSAGES
When power i fir t applied to the cale a check i made to a ure the
A/D count are within a normal range. If an error i hown at thi time
the A/D count are either too high or too low.
ADO A/D count at turn on are too high.
ADL A/D count at turn on are below zero.
In either ca e, check the A/D count a de cribed above. Verify the load
cell, load cell wiring and the A/D count are acceptable. Try to calibrate
the cale if the A/D count are acceptable.
During normal operation, the di play may how an error under the e
condition :
Model CQT-
202
CQT-
251
CQT-
601
CQT-
1501
CQT-
2601
CQT-
2000
CQT-
5000
Calibration
Weight
50g
tep to
max
50g
tep to
max
50g
tep to
max
500g
tep to
max
50g
tep to
max
50g
tep to
max
50g
tep to
max

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--ERR- U er etting error
---ADO A/D value too
high(overload)
---ADL A/D value too low
------ The weight i overload
more than 9 divi ion .
Unit-E Unit error
Low battery
PROBLEM POSSIBLE CAUSES
Di play i blank Main power i turned off
No turn on te t Power upply not plugged in
Power upply faulty
Di play i di connected or faulty
After turn on te t ,Error me age i
Di played
Pan not in talled
Un table weight
Load cell damaged
Di play i un table Draft or air current
Ob truction under pan
Sample i moving (animal weighing)
Vibration through table
Temperature changed dramatically
Power upply faulty
Weight value incorrect Calibration error, Recalibrate
Unit calibrated with inaccurate weight
Balance not level
Ob truction between ample and cover
breeze hield
Wrong unit of weight di played
Cannot u e Full Capacity Over load Stop hitting pan upport
hitting bottom of load cell
Shipping crew not removed from ba e
problem on A/D Load Cell Damaged
Not Linear Overload top hitting too oon Load cell
damaged
A/D damaged
Capacitor( ) on A/D PCB damaged
Off Center Loading error Overload Stop not correct
Load Cell damaged
Keyboard failure Key damaged
Cable to di play/keyboard not connected
Backlight doe not turn on Backlight module damaged
Backlight power upply failed
Incomplete LCD di play Poor contact on LCD
Damaged LCD or circuit board

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9 TROUBLE SHOOTING GUIDE

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Manufacturer’s Declaration of Conformity
This product has been manufactured in accordance with the harmonised European standards,
following the provisions of the below stated directives:
Electro Magnetic Compatibility Directive 2004/108/EC
Low Voltage Directive 2006/95/EC
Adam Equipment Co. Ltd.
Bond Avenue, Denbigh East
Milton Keynes, MK1 1SW
United Kingdom
9.1.1.1.1 FCC COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. The
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Shielded interconnect cables must be employed with this equipment to insure compliance with the
pertinent RF emission limits governing this device.
Changes or modifications not expressly approved by Adam Equipment could void the user's
authority to operate the equipment.
9.1.1.1.2 WEEE COMPLIANCE
Any Electrical or Electronic Equipment (EEE) component or assembly of parts intended to be
incorporated into EEE devices as defined by European Directive 2002/95/EEC must be recycled or
disposed using techniques that do not introduce hazardous substances harmful to our health or the
environment as listed in Directive 2002/95/EC or amending legislation. Battery disposal in Landfill
Sites is more regulated since July 2002 by regulation 9 of the Landfill (England and Wales)
Regulations 2002 and Hazardous Waste Regulations 2005. Battery recycling has become topical
and the Waste Electrical and Electronic Equipment (WEEE) Regulations are set to impose targets
for recycling.

©Adam Equipment Company 2011
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ADAM EQUIPMENT is an ISO 9001:2008 certified global company with
more than 35 years experience in the production and sale of electronic
weighing equipment.
Adam products are predominantly designed for the Laboratory,
Educational, Medical, retail and Industrial Segments. The product range
can be described as follows:
-Analytical and Precision Balances
-Compact and Portable Balances
-High Capacity Balances
-Moisture analysers / balances
-Mechanical Scales
-Counting Scales
-Digital Weighing/Check-weighing Scales
-High performance Platform Scales
-Crane scales
-Medical Scales
-Retail Scales for Price computing
For a complete listing of all Adam products visit our website at
www.adamequipment.com
© Copyright by Adam Equipment Co. Ltd. All rights reserved. No part of this
publication may be reprinted or translated in any form or by any means without
the prior permission of Adam Equipment.
Adam Equipment reserves the right to make changes to the technology,
features, specifications and design of the equipment without notice.
All information contained within this publication is to the best of our knowledge
timely, complete and accurate when issued. However, we are not responsible
for misinterpretations which may result from the reading of this material.
The latest version of this publication can be found on our Website.
www.adamequipment.com