Measuretek EHC-W-3 User manual

EHC-W (52WX78B - )52WX81B
Contents subject to change without notice
Version 1.0
01/2023
USER MANUAL

TABLE OF CONTENTS
1. INTRODUCTION ................................................................................................................ 1
1.1 Gener l nd S fety Inform tion ....................................................................................................................... 1
1.2 Specific tions .................................................................................................................................................. 1
2. OVERVIEW OF CONTROLS AND FUNCTIONS ....................................................................... 2
2.1 Front Displ y ................................................................................................................................................... 2
2.2 Control Functions ............................................................................................................................................ 3
3. OPERATIONS ................................................................................................................... 4
3.1 Turning Sc le On/Off nd Weighing ................................................................................................................. 4
3.2 Zero Oper tion ................................................................................................................................................ 4
3.3 T re ................................................................................................................................................................. 4
3.4 Ch nge Unit of Me surement ........................................................................................................................... 4
3.5 Check Weighing .............................................................................................................................................. 5
3.6 Counting ......................................................................................................................................................... 5
3.7 Percent Weighing ............................................................................................................................................ 6
3.8 Accumul tion .................................................................................................................................................. 6
3.8.1 M nu l Accumul tion ........................................................................................................................... 6
3.8.2 Autom tic Accumul tion ....................................................................................................................... 7
3.9 Auto-off Timer ................................................................................................................................................. 7
4. SERIAL COMMUNICATION DETAILS .................................................................................... 7
5. CALIBRATION .................................................................................................................. 9
6. PARAMTER SETTING ...................................................................................................... 10
7. DISPLAY SYMBOL MEANING ............................................................................................ 11
8. TROUBLESHOOTING ...................................................................................................... 11
8.1 Troubleshooting ............................................................................................................................................. 11
8.2 B ttery nd Ch rging ..................................................................................................................................... 12
9. REPLACEMENT PARTS ................................................................................................... 12
10. ONE YEAR LIMITED WARRANTY ....................................................................................... 12

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1. INTRODUCTION
1.1 Gener l nd S fety Inform tion
 For use in dry en ironments only.
 This product uses a Lead-Acid battery. Dispose of according to local laws and regulations.
 Read and understand all operating instructions before using this product.Keep this manual for
future reference.
 Allow sufficient warm up time. Turn the scale on and allow up to 10 minutes for internal components to
stabilize before weighing.
 Record the weight shortly after placing a load on the platter. Lea ing loads in place for extended periods may
ary the load cell’s output signature and may result in a less accurate reading.
 A oid extended exposure to extreme heat or cold. Optimum operation is at normal room temperature. See
operating temperature range in the specifications table. Allow the scale to acclimate to room temperature
before using.
 When storing the scale for extended periods, the battery must be charged e ery 90 days to a oid premature
performance degradation. O er time, the operating time per charge will degrade. If the operating time is no
longer acceptable e en after recharging, the battery must be replaced.
 Electronic scales are precision instruments. Do not operate near cell phones, radios, computers or other
electronic de ices that emit radio frequencies that may cause unstable readings.
1.2 Specific tions
Model 52WX78B
EHC-W-3
52WX79B
EHC-W-6
52WX80B
EHC-W-15
52WX81B
EHC-W-30
M x. C p city 6 lb (3 kg) 12 lb (6 kg) 30 lb (15 kg) 60 lb (30 kg)
Re d bility 0.0002 lb (0.1 g) 0.0005 lb (0.2 g) 0.001 lb (0.5 g) 0.002 lb (1 g)
Displ y Resolution 1:30000 1:30000 1:30000 1:30000
Min. Recommended
Weight 0.004 lb (2 g) 0.01 lb (4 g) 0.02 lb (10 g) 0.04 lb (20 g)
Min. S mple Weight 1%FS 30g 60g 150g 300g
Weighing Units g / kg / lb /oz
C libr tion Unit kg / lb
Modes Weighing, counting, check weighing, % weighing, accumulation
Weight Displ y 1-Window backlit LCD display, 1 inch high, 6 1/2 digits, 7-segment
Zero R nge Power-on zero range: calibration zero point±10%FS;
ZERO key range: power-on zero±5%FS
T re R nge Full capacity
St biliz tion Time <5 seconds
Oper ting Temper ture 14° to 105°F (-10° to 40°C)
Humidity R nge <90% relati e humidity, non-condensing
Power Supply Acid battery or AC power adapter (12Vdc/500mA with central positi e)
B ttery Perform nce 80-hour continuous use with 12-hour recharge time (with backlit OFF)
Extern l Interf ce RS232
S fe Overlo d C p city 150% of capacity
Pl tter Dimensions 11.4” x 8.7” (290 x 220 mm)
Sc le Dimensions
(L x W x H) 13.5” x 11.6” x 4.5” (294 x 342 x 115 mm)

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2. OVERVIEW OF CONTROLS AND FUNCTIONS
2.1 Front Displ y
 - Scale is zeroed, gross weight is 0, tare is 0.
 - Scale is stable.
 NET - Display reading is net weight; tare is not 0.
 Tot l - Display data is total number of accumulations, weight, pieces, or percentage.
 lb - Measuring unit is lb or lb:oz
 oz - Measuring unit is oz or lb:oz

kg
-
Measuring
unit is kg
 g - Measuring unit is g
 % - Measuring unit is % (in percentage weighing mode).
 Pcs - Measuring unit is pieces (in counting mode).
 HI - Check-weighing is enabled. Current data is abo e the specified upper limit.
 OK - Check-weighing is enabled. Current data is between the specified upper and lower limits.
 LO - Check-weighing is enabled. Current data is below the specified lower limits.
 - Battery le el.

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2.2 Control Functions
~
Enters a number in counting and checking weighing modes and calibration
Clears
the input number or accumulated alue
Performs a tare operation
Confirms the operation or entered data
Sets zero if the scale is on
Adds the alue to the accumulation memory
Recalls the accumulated total alue (Long press)
Changes unit of measurement between kg, g, lb and oz
Outputs data ia RS232 port
Enters check weighing mode, set Hi and Lo alues
Enters percentage weighing mode
Displays unit weight(g/pcs), total weight(kg) or count(pcs) in counting mode
Enters into counting mode
Exits the current working mode and return to normal weighing mode
Turns the scale on / Turns the scale off (Long press)
Exists setup, calibration or other modes

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+
Enters calibration mode
+
Enters LCD and key test mode
+
Enters parameter setting mode
+
Checks inner code and oltage
3. OPERATIONS
3.1 Turning Sc le On/Off nd Weighing
Place the scale on a flat, stable surface. Le el the scale using the le eling bubble at the lower left side of the
display.
With the weighing platter empty, turn on power switch (located underneath on the left-hand side of the scale).
Press the ESC/ON/OFF key to power on the scale. The self-check will run and the scale will display a zero
reading.
When the scale displays 0, place objects at the center of the platform and read the weight.
To power off the scale, press and hold the ESC/ON/OFF key.
3.2 Zero Oper tion
You can press the ZERO key at any time to set the zero point from which all other weighing and counting is
measured, within + 5% of power up zero. This will usually only be necessary when the platform is empty. When
the zero point is obtained, the display will show the indicator for zero.
3.3 T re
Place a container on the platform, a alue for its weight will be displayed.
Press the TARE key to tare the scale. The weight displayed is stored as the tare alue and that alue is
subtracted from the display, lea ing zero on the display. The "NET" indicator will be on. As product is added,
only the weight of the product will be shown. The scale could be tared a second time if another type of product
is added to the first one. Again only the weight added after taring will be displayed.
When the container is remo e, a negati e alue will be shown. If the scale is just before remo ing the container,
this alue is the gross weight of the container plus all products remo ed.
3.4 Ch nge Unit of Me surement
In normal weighing mode, press the Unit key to switching the measuring units between kg, g, lb and oz.

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3.5 Check Weighing
Use this mode to determine if the weight of a sample is within prescribed limits. Check weighing works in normal
weighing, percentage weighing and counting mode.
Press the LIMIT key. The display will show “

”, and then “

”. Use unit key to choose the
measuring units you need. Press Tare key to confirm.
The display will show “



” and then display 0. User 0-9 keys to input the alue, press the TARE key to
confirm. If you want to reset the alue to zero, press the C key to clear the alue.
After pressing the TARE key, the display will then show “



” and then 0. Enter the low limit in the same way
the high limit was entered.
After pressing the TARE key, the scale will return to weighing with the Check weighing function enabled.
When a weight is placed on the scale, the HI/OK/LO symbol will be shown if the weight is abo e or below the
limits and the beeper will sound as described below.
Both limits set
The display will show OK and the beeper will sound when the weight is between the limits.
Low limit set, High limit set to zero
The display will show “OK” and the beeper will sound when the weight is less than the Low Limit. When abo e
the Low Limit the display will show “HI” and the beeper will be off.
High limit set, Low limit set to zero
The display will show “LO” and the beeper will be off when the weight is less than the High Limit. When abo e
the High Limit the display will show “OK” and the beeper will be on.
Both limits set. LOW is set gre ter th n HIGH
The beeper will ne er sound and the display will show “LO” if the weight is less than the LOW limit, and “HI” if
the weight is greater than the Low Limit.
NOTE:
The weight must be greater than 20 scale di isions for the check weighing mode to work.
To disable the Check-Weighing function, enter zero into both limits by pressing the C key when the current
limits are shown. Then press the TARE key to store the zero alues.
3.6 Counting
Before the start of counting, tare the weight of any container that will be used, lea ing the empty container on
the scale.
Place the samples on the scale, press the FUNC key to begin. The scale will show "



. ---", use 0-9 keys to
input the samples quantity, press the TARE key to confirm. If you want to reset the alue, press the C key to
clear the alue.
Now put more weight on the scale, the display will show the number of parts(pcs).
Press the % key to display unit weight (g/pcs), total weight (kg) or the count(pcs).

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Press the FUNC key to return to normal weighing.
NOTE: Sample piece weight should not be less than 0.5d; otherwise, the scale will display “

”, then
return to normal weighing mode in 2s.
3.7 Percent Weighing
The scale will allow a sample weight to be shown as 1% - 100%. Then any other weight placed on the scale will
be displayed as a percentage of the original sample.
Put a sample on the scale, press the % key to enter percentage weighing mode, the display will show
“SPL.100%”.
Press the 0 key to set to 1%, display shows “

” (sample weight must be > 50d)
Press the 1 key to set to 2%, display shows “

” (sample weight must be > 100d)
Press the 2 key to set to 5%, display shows “

” (sample weight must be > 250d)
Press the 3 key to set to 10%, display shows “

” (sample weight must be > 500d)
Press the 4 key to set to 20%, display shows “

” (sample weight must be > 1000d)
Press the 5 key to set to 50%, display shows “

” (sample weight must be > 2500d)
Press the 6 key to set to 100%, display shows “

” (sample weight must be > 5000d)
Press the T re key to confirm. Remo e the sample, and put another weight on the scale, it will display the
percentage of the original sample.
For example, if 6kg is placed on the scale and the % key is pressed, the display will show 100.00%. Press the
T re key.
Remo e the 6kg weight and put a 3kg weight on the scale, then the display will show 50% as 3kg is 50% of 6kg.
Pressing the FUNC key will return the scale to normal weighing mode.
3.8 Accumul tion
Accumulation can be used in both weighing and counting modes. The default setting is Manual Accumulation in
this scale.
3.8.1 M nu l Accumul tion
When the scale is set to manual accumulation, the weight displayed will be stored in memory when the ACCU
key is pressed and the weight is stable.
The display will show "

" and then the total in memory for 2 seconds before returning to normal.
Remo e the weight, allowing the scale to return to zero and put a second weight on. Press the ACCU key, the
display will show "ACC 002" and then show the new total.
Continue until all weights ha e been added.
To iew the totals in memory, press the ACCU key when the scale is at zero. The display will show the total
number of items "ACC xxx" and then the total weight before returning to zero.

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NOTE: In all cases the scale must return to zero or a negati e number before another sample can be added to
the memory. More products can then be added and the ACCU pressed again. This can continue for up to 99
entries, or until the capacity weight display is exceeded.
3.8.2 Autom tic Accumul tion
When the scale has been set to Automatic Accumulation, the alue is stored in memory automatically.
Put a weight onto the scale, the beeper will sound when the scale is stable to signify the alue is accepted,
Remo e the weight, 2 seconds later the “total” symbol will be on. The scale will show "

", then display
the total alue. Then “total” symbol will be off after 2s and back to weighing mode.
Remo e the weight, and add a second weight on the scale, repeat the process.
The totals can be iewed as abo e.
3.9 Auto-off Timer
Use this mode to reset the automatic shut off time, from 0 - 30 minutes. The default auto-off time is 5 minutes.
In normal weighing mode, press the ESC/ON/OFF and 2 keys until the scale displays “

”, then
displays “

xx”.
Use the 0 - 9 keys to input the time from 0 to 30, press the TARE key to confirm. Press the
ESC/ON/OFF key to return to normal weighing mode.
NOTE: If a number more than 30 is input, the display will remain unchanged after pressing the TARE key.
4. SERIAL COMMUNICATION DETAILS
The default baud rate and data format in this scale are 9600 and 8N1.
Connect the scale with computer ia RS232 cable, then power on the scale.
Open the Hyperterminal (pre-installed in PC) or COM ASSISTANT (a ailable from the link as below) on the
computer, set the baud rate and data format on the software to 9600 and 8N1, and then click Open Com.
http://www.easthigh.com.cn/fileInfoController/index?buttonType=DOWNLOAD

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In normal weighing mode, when reading is stable, press the Print key to output data ia RS232 interface:
Gross: xxx.xxxkg/lb/oz
Tare: xxx.xxxkg/lb/oz
Net: xxx.xxxkg/lb/oz
ACC.N: xxxxxxxxx
Total: xxxxxxxxxkg/lb/oz
In counitng mode, when reading is stable, press the Print key to output data ia RS232 interface:
Gross: xxx.xxxkg
Tare: xxx.xxxkg
Net: xxx.xxxkg
Pc.wt.: xxxx.xxg
Count: xxxxxxxxxpcs
ACC.N: xxxxxxxxx
Total: xxxxxxxxxpcs
In % weighing mode, when reading is stable, press the Print key to output data ia RS232 interface:
Gross: xxx.xxxkg
Tare: xxx.xxxkg
Net: xxx.xxxkg
100%.WT:xxx.xxxkg
Percent: xxxxx.xx%