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Instruction Manua
Model LC-2x4
4 Channel VW Datalogger
No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility
for errors, omissions or misinterpretation. The information herein is subject to change without notification.
Copyright © 2007 - 2018 by Geokon, Inc.
(Doc Rev W, 11/14/2018)
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Table of Contents
Related Manuals for Geokon LC-2x4
Summary of Contents for Geokon LC-2x4
- Page 1 4 Channel VW Datalogger No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc. The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for errors, omissions or misinterpretation.
- Page 3 Upon examination by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having been tampered with...
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Page 4: Table Of Contents
2.5.3 LogView Workspaces ..........................6 2.5.4 Adding Projects to LogView Workspaces ....................7 2.5.5 Adding Dataloggers to LogView Projects ....................8 2.5.6 LC-2x4 Connection (8002-4-1, RS-232) ....................10 2.5.7 LC-2x4 Connection (8002-4-2, USB) ......................10 2.5.8 LC-2x4 Connection 8002-4-3 (RS_485) ....................10 2.5.9 Connecting to a Datalogger with LogView ....................11 2.5.10 Determining COM Port Numbers ......................12... - Page 5 3.34 “ST ” - S ........................33 TART OGGING 3.35 “SV” - D ......................33 ISPLAY OFTWARE ERSION 3.36 “TEST” - P ....................33 ERFORM NTERNAL ESTS 3.37 “TF” - D ......................34 ISPLAY OR ORMA 3.38 “T ” – S ........................
- Page 6 FIGURES 1 - B ............................4 IGURE ATTERY ETAIL 2 - S ......................... 6 IGURE ELECT ORKSPACE 3 - S ........................6 IGURE ELECT ORKSPACE OLDER 4 - L ........................... 7 IGURE INDOW 5 - L .................... 8 IGURE INDOW WITH NEW PROJECT 6 - L ..........................
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Page 7: Introduction
Communication with the LC-2x4 is implemented via the host computer’s USB 2.0 port. When connected to a computer via the USB port, the LC-2x4 appears to the computer as a “virtual” COM port. The LC-2x4 datalogger also receives all of its operating power from the computer, thus extending the internal 3V (or external 12V) battery life. -
Page 8: Getting Started
2. GETTING STARTED The following equipment will arrive with the Model LC-2x4 datalogger: (If any accessories are missing or damaged, please contact the factory.) • Set of two alkaline D cell batteries. • Set of four desiccant packs packaged with the batteries. -
Page 9: 10-Pin Bulkhead Models (8002-4A-1, 8002-4A-2, 8002-4A-3)
Cable Terminal Channel Description Wire Block Position Number Color VW1+ Vibrating Wire + VW1- Vibrating Wire - BLACK TH1+ Thermistor + WHITE TH1- Thermistor - GREEN Analog Ground BARE SHLD1 (shield) WIRE VW2+ Vibrating Wire + VW2- Vibrating Wire - BLACK TH2+ Thermistor +... -
Page 10: Battery Installation
LC-2x4 enclosure is suggested. The stake should be driven as close to the datalogger as possible, and to a depth of at least one meter (three feet). A copper grounding lug is supplied on the exterior of the LC-2x4 enclosure to provide connection to this wire from the grounding rod. -
Page 11: Software Installation And Setup
This installation procedure needs to be performed only once for each computer that will run LogView to communicate with an LC-2x4 datalogger. NOTE: The USB drivers are only required for LC-2x4 models 8002-4-2 and the 8002-5 RS-485 Interface Make sure that the two 1.5-volt D cell alkaline batteries are installed in the datalogger (See Section 2.2, “Battery Installation”... -
Page 12: Logview Workspaces
2.5.3 LogView Workspaces When opening LogView for the first time, the user will be prompted to create a workspace name (see Figure 2). The workspace name can be any combination of letters and numbers and, ideally, will be descriptive in nature. See the LogView User’s Guide for more information on workspaces. -
Page 13: Adding Projects To Logview Workspaces
Figure 4 - LogView Main Window 2.5.4 Adding Projects to LogView Workspaces Right-clicking on the “PRODUCTION” workspace brings up a context sensitive menu that allows the user to add projects to this workspace (using the “New→Project” menu selection). Select a name that makes sense for the real-world project this program will be used for. -
Page 14: Adding Dataloggers To Logview Projects
Datalogger Settings. For connection purposes, the relevant tab in this dialog is “Connection Options” (see Figure 7). After physically connecting to a PC, all LC-2x4 dataloggers require a COM port to be identified in the “Connection Options”. Starting with firmware revision 3.1.X, LC-2x4 dataloggers can communicate at baud rates of 9600 and 115,200. -
Page 15: Figure 6 - Log View Contextm
Figure 6 - LogView Context Menu Figure 7 - Datalogger Settings, Connection Options... -
Page 16: Lc-2X4 Connection (8002-4-1, Rs-232)
2.5.6 LC-2x4 Connection (8002-4-1, RS-232) Connect the supplied LC-2x4 RS-232 Communications cable (S-8001-6) to the COM port of the LC-2x4 datalogger. The protective cap on the datalogger COM connector is removed by pushing in and turning. Plug the DB-9 end of the RS-232 Communications cable into the host computer’s RS-232 port (either internal or external via a USB to Serial... -
Page 17: Connecting To A Datalogger With Logview
3) Click on the “Upload Settings” button on the LogView Toolbar to synchronize the datalogger with the LogView configuration (see Figure 10). 4) LogView is now connected and configured correctly for the LC-2x4 datalogger. Sensors can now be added to the datalogger in a similar fashion as adding Dataloggers to Projects. -
Page 18: Determining Com Port Numbers
2.5.10 Determining COM Port Numbers When connecting an 8002-4-1 datalogger to a PC with an internal serial port(s) the COM Port number that LogView requires is usually COM1 or COM2 but, occasionally may be COM3 if the PC has more than one internal serial port. Figure 11 below illustrates that the PC has two serial ports, one internal (COM1) and the other via a USB to serial converter (COM13). -
Page 19: Communication Setup Example Using Hyperterminal
2.6 Communication Setup Example Using HyperTerminal NOTE: If using a 8002-4-2 USB LC-2x4, it is important that the LC-2x4 first be connected to the computer’s USB port before attempting to communicate so that the LC-2x4 can be recognized by the computer as a virtual COM port. -
Page 20: Com Port Settings
8 Data bits, no Parity, 1 Stop bit, no Flow control. 8002-4-2 (USB): Configure the new COM port that is added when the LC-2x4 is connected as 9600 Bits per second, 8 Data bits, no Parity, 1 Stop bit, no Flow control. - Page 21 1) Type ? <ENTER> to display the Help list. See Section 3 for detailed information on all the commands listed. Note: All commands must be entered in capital letters. Command Description ------------------------------------------------ View current Clock CSmm/dd/yy/hh:mm:ss Clock Set DEFAULT Load factory DEFAULT gage settings Date Format(0=julian,1=month,day) Display DataLogger type Dnnnnn...
- Page 22 Software Version TEST System Test Time Format (0 = hhmm, 1 = hh,mm) Tnn/t Thermistor information, where; nn = Channel # t = Thermistor Type 0=standard 1 = high temp BR55A822J 2 = high temp 103JL1A) TR,TR0 display TRap count, zero TRap count display Lithium cell Voltage display 3V Battery Voltage display 12V Battery Voltage...
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Page 23: Command List
3. COMMAND LIST 3.1 “BRnnn”- Set or Display the Current Baud Rate This command is not displayed in the help text (?<ENTER>). Displays or sets the current baud rate. Valid numbers for “nnn” are 9 (9600 baud) or 115 (115,200 baud). The example below changes the baud rate to 9600 with no confirmation. -
Page 24: Df" - Display Or Set Date Format
Date format is julian. 3.6 “DL” – Display Current Mode Displays the current datalogger mode setting. LC-2x4 3.7 “Dnnnn” - Display Arrays Forward from User Position Use the D command to display arrays forward from the User Position for verification or collection. -
Page 25: E" - Low Power Sleep Mode
2007,11,23,17,56,43,2.98,23.96,9038.542,-999999.0,-999999.0,-999999.0,22.7,-99.0, -99.0,-99.0,5 MS:3146 OP:3147 UP:6 MS represents the Memory Status of the datalogger. This number indicates how many arrays have been written to memory. In this example, MS:3146 indicates that 3146 out of 10666 arrays have been written to memory. OP:3147 indicates that the next memory location to be written to is location 3147. -
Page 26: Gnn/C/Tt/Szzzzzz/Sffffff/Soooooo" Or "Gnn/C/Tt/Saaaaaa/Sbbbbbb/Scccccc" - Gage Settings
CH 1: ENABLED GT: 3 ZR: 490.0000 GF: -0.00150 GO: 0.00000 *Note: If selecting Gage Type 0 to disable the channel, the LC-2x4 will only return “*”. Use the MXS command (Section 3.18) to view the disabled channels. When using linear conversion (L) of the instrument reading, the G command is used to select the gage type and enter the gage zero reading, gage factor, and gage offset. - Page 27 “ZeroReading” is referred to as R Polynomial Conversion: Gnn/c/tt/saaaaaa/sbbbbbb/scccccc Where: nn = Channel # (Valid entries are 1, 2, 3, and 4 for the LC-2x4) c = Conversion Type(L/P) t = Gage Type: 0: Channel Disabled (will display “---“) 1: VW Gage Type 1...
- Page 28 2.6) AND the gage conversion is set for polynomial. When using LogView to set up the datalogger configuration, the multiplication is performed by LogView. Refer to the appropriate sensor manual for more information on how to calculate the C coefficient. Geokon Model Gage Type Description...
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Page 29: Table 4 - Engineering Unitsm
Type Measurement Description Output Linear Range Polynomial Type Units Range Channel Disabled Vibrating Wire Middle frequency sweep, 1400-3500 Hz Digits 1960 to 12250 1.960 to 12.250 Vibrating Wire High frequency sweep, 2800-4500 Hz Digits 7840 to 20250 7.840 to 20.250 Vibrating Wire Very low frequency sweep, 400-1200 Hz Digits 160 to 1440... -
Page 30: Iddddddddddddddddd" - Display Or Set Datalogger Id
3.10 “IDdddddddddddddddd” - Display or Set Datalogger ID The ID is a 16-character string that can be used to identify a datalogger and the data that is transmitted by it. If an ID is entered it will be transmitted as the first element in each array of data. -
Page 31: Ln/Lllll/Iii" - Define Length And Iteration Of Interval
Log Intervals List ------------------------------------------------ Interval #1 Length: 10 Iterations: 100/96 Interval #2 Length: 20 Iterations: 90/90 Interval #3 Length: 30 Iterations: 80/80 Interval #4 Length: 40 Iterations: 70/70 Interval #5 Length: 50 Iterations: 60/60 Interval #6 Length: 60 Iterations: 50/50 The above list indicates that there are 96 iterations of interval #1 left before interval #2 begins execution. -
Page 32: Ld" - Disable Log Intervals
3.13 “LD” - Disable Log Intervals If logging is started (ST command) it will continue based on the scan interval entry (SC command). Log intervals disabled. *Datalogger#1,2007,11,25,11,41,17,2.92,20.63,9.055, -999999.0,-999999.0,-999999.0,22.5,-99.0,-99.0,-99.0,549 3.14 “LE” - Enable Log Intervals If logging is started (ST command) it will continue based on the interval lengths and iterations of the log list (SC command). -
Page 33: Mxs" - Display Multiplexer Status
3.19 “MXn” – Set the Maximum Number of Channels Set the maximum number of channels of the multiplexer. Can be set to 4 or 16. Set to 4 by the factory for all LC-2x4 dataloggers. *MX4 4 Channel Multiplexer Selected. -
Page 34: Na" - Display Network Address
3.21 “NA” - Display Network Address Displays the current network address. Network address: 1 When network recognition is enabled, this number (preceded by the # character) must be entered for the respective datalogger to respond. The following example illustrates communication with two different dataloggers on the RS-485 network. -
Page 35: Nd" - Network Disable
Enables networking of two or more LC-2x4 dataloggers. Network recognition enabled. Note: If a networked LC-2x4 is connected via the RS-232 or USB port, connection to the datalogger can be made directly without the need to enter the correct datalogger address. This can be helpful if the network address is unknown and the datalogger is network enabled. -
Page 36: Pnnnn" - Set User Position Memory Pointer
3.26 “Pnnnn” - Set User Position Memory Pointer Type P and a number between 1 and 10666 to position the pointer. Arrays can then be displayed (D command) from the new position. The updated pointers will display after entering a valid position. -
Page 37: Scnnnnn" - Set Scan Interval
Line Description Manual Sections Status of memory pointers 3.7, 3.26 Multiplexer Type 3.18 Scan interval setting 3.30 Start/Stop status 3.32, 3.34 Stop time (optional) 3.32 Log interval status 3.13, 3.14 Monitor mode status 3.15, 3.16, 3.17 Table 6 - S Command Information 3.30 “SCnnnnn”... -
Page 38: Sphh:mm" - Stop Logging
3.32 “SPhh:mm” - Stop Logging Stop the datalogger logging values; hh is the hour (24-hour format) of the day to stop and mm the minutes. The time entry is optional. *SC60 Scan interval: 60 second(s). Logging started. Datalogger#1,2007,11,25,14,10,05,2.94,23.99,9.071,---,---, ---,22.9,---,---,---,1 *SP12:00 Logging will start at: 15:13:46 Logging will stop at: 12:00:00 Note that when SPhh:mm is issued, the datalogger responds with the time of the next reading... -
Page 39: Sthh:mm" - Start Logging
3.34 “SThh:mm” - Start Logging Start the datalogger logging values; hh is the hour of the day (24-hour format) to start and mm the minutes. The time entry is optional. Entry is ignored if logging is already started (unless a time is entered). -
Page 40: Tf" - Display Or Set Time Forma
Selection Description Test the Configuration memory bank Test Readings 1-1777 memory bank Test Readings 1778-3554 memory bank Test Readings 3555-5331 memory bank Test Readings 5332-7108 memory bank Test Readings 7109-8885 memory bank Test Readings 8886-10666 memory bank Test all memory banks Turn on System power supplies Test the 32.768 RTC timebase External Input with Gage Type 1 filter... -
Page 41: Tnn/T" - Set Thermistor Type
3.38 “Tnn/t” – Set Thermistor Type Enter the channel’s (nn) thermistor type (t). This command allows a specific thermistor to be assigned to each individual channel (generally the external thermistor that is incorporated into the VW gage). Entering T1/0 sets the external thermistor type of Channel 1 to the standard 3KΩ@25ºC NTC (default). -
Page 42: V3" - Display Thed Cell Battery Voltage
3.42 “V3” – Display the D Cell Battery Voltage Displays the three-volt D cell battery pack voltage. Replace the batteries when this voltage is less than 1.8-volts. 3V Battery Voltage = 2.93V 3.43 “V12” – Display the External Battery Voltage Displays the external 12-volt battery voltage. -
Page 43: X" - Take Immediate Reading
3.45 “X” - Take Immediate Reading Takes and displays one reading, but do not store this reading in memory. Useful if interested in obtaining a reading at the moment, without interrupting or affecting the current logging schedule. MS:3 OP:4 UP:3 Datalogger#1,2007,11,25,13,11,39,2.93,23.59,9.060,---,---,---,22.8,---,---,--- MS:3 OP:4 UP:3 Note: In this example, Channels 2, 3, and 4 are disabled... -
Page 44: Maintenance
4. MAINTENANCE While the Model LC-2x4 Datalogger is designed to operate in field environments, nevertheless there are some basic maintenance procedures that should be followed to insure maximum reliability and functionality. 4.1 Cleaning The outside of the box can be cleaned using a cloth dampened with soap and water. DO NOT... -
Page 45: Troubleshooting
5. TROUBLESHOOTING Listed below are a few commonly experienced problems and remedial action. Contact the factory should a problem arise not explained herein or additional information be needed. Symptom: Unit will not respond to communications Wrong COM port selected. The USB Drivers may not be properly installed. -
Page 46: Appendix A. Specifications
APPENDIX A. SPECIFICATIONS A.1 Measurement Capability Vibrating Wire (all types). • External temperature (thermistor). • Internal temperature (thermistor). • Main battery voltage (3V and 12V). • RTC lithium battery voltage. • A.2 Power Power supply: Internal 3 VDC (7.5Vmax) or External 12 VDC (15Vmax) Processing/communication current: <100 mA VW measurement current:... -
Page 47: Clock
Full calendar Time format: 12 or 24 hour (selectable) Date Format: mm,dd or julian (selectable) Accuracy: ±2 minutes per year A.5 Serial Interface (all LC-2x4 models) Speed: 9600 bps & 115,200 (version 3.1.X and later) Parameters: 8 Data bits 1 Stop bit... -
Page 48: Main Battery Measurement
A.9 Main Battery Measurement 3V Battery: 12V Battery: Range: 0 to 7.5 VDC Range: 0 to 15 VDC Accuracy: ±1.83mV Accuracy: ±3.662mV Resolution: 0.01 VDC A.10 Multiplexer Relay NAIS TXS2SA-4.5V Contact resistance: 0.1 ohm (max) Switching current: 1A (max) -
Page 49: Appendix B. Connector Pinouts
APPENDIX B. CONNECTOR PINOUTS B.1 Transducer Cable Connections Terminal Block Channel Description Cable Wire Position Number Color VW1+ Vibrating Wire + VW1- Vibrating Wire - BLACK TH1+ Thermistor + WHITE TH1- Thermistor - GREEN SHLD1 Analog Ground (shield) BARE WIRE VW2+ Vibrating Wire + VW2-... -
Page 50: Usb Connector Pinout
B.3 USB Connector Pinout (8002-4-2) The mating 10 pin Bendix plug is part number PT06F-12-10P. 10 Pin Internal Wire PCB connector J5 Description Bendix Color Brown USB VCC USB DM Orange USB DP Yellow Digital Ground Green RS-485 RX Blue RS-485 /RX Violet RS-485 TX... -
Page 51: Appendix C. Data File Transfer To A Windows Pc
APPENDIX C. DATA FILE TRANSFER TO A WINDOWS PC Data can be downloaded to the PC either via LogView software (refer to the LogView Online Help) or via Windows HyperTerminal, which, prior to Windows Vista, was supplied with most personal computers. -
Page 52: Downloading Data Using Hyperterminal (Or Equivalent)
After a data collection has finished LogView will display the message shown in Figure 19: Figure 19 - Data Collection Complete Message C.2 Downloading Data using HyperTerminal (or equivalent) The steps to download the data using HyperTerminal are as follows: Launch HyperTerminal: Start →... - Page 53 3) In the COM Properties Dialog, enter the “Port Settings”. Select Apply. Select OK (Figure 22). Figure 22 - HyperTerminal COM Port Settings 4) With the cursor in the display screen, press the Enter key a few times to verify that communications have been established.
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Page 54: Figure 24 - Specify Data Capture
Figure 24 - Specify Data Capture File 7) With the cursor in the display screen, push the <Enter> key a few times to wake-up the datalogger, then: Type “S” to get the Status of the datalogger. Type “P1” to position the data array Pointer at location one. Type “D5”... -
Page 55: Appendix D. Sample Data File
APPENDIX D. SAMPLE DATA FILE D.1 Sample Raw Data File Datalogger#1,2007,329,1421, 0 ,2.93,25.01,-9040.265,---,---,---,23.7,---,---,---,1 Datalogger#1,2007,329,1421,10,2.93,25.13,-9039.986,---,---,---,23.7,---,---,---,2 Datalogger#1,2007,329,1421,20,2.93,25.42,-9039.950,---,---,---,23.7,---,---,---,3 Datalogger#1,2007,329,1421,30,2.93,25.30,-9041.042,---,---,---,23.7,---,---,---,4 Datalogger#1,2007,329,1421,40,2.93,25.16,-9040.502,---,---,---,23.7,---,---,---,5 Datalogger#1,2007,329,1421,50,2.93,25.07,-9039.458,---,---,---,23.7,---,---,---,6 Datalogger#1,2007,329,1422, 0 ,2.93,25.04,-9040.303,---,---,---,23.7,---,---,---,7 The comma delineated columns above represent the following: Column 1 represents the datalogger id Column 2 represents the year when the array was stored. Column 3 represents the julian day (or day, month format, see Section 3.5). -
Page 56: Appendix E. Thermistor Temperature Derivation
APPENDIX E. THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: A+B ( LnR ) +C(LnR) -273.2 Equation 5 - Convert Thermistor Resistance to Temperature Where: T = Temperature in °C. LnR = Natural Log of Thermistor Resistance = 1.4051 ×... - Page 57 Thermistor Type: Thermometrics BR55KA822J Resistance to Temperature Equation: A+B ( LnR ) +C(LnR) -273.2 Equation 6 - Convert Thermistor, Type BR55KA822J, Resistance to Temperature Where: T = Temperature in °C. LnR = Natural Log of Thermistor Resistance = 1.02569 × 10 -3 = 2.478265 ×...
- Page 58 Thermistor Type: U.S. Sensor 103JL1A Resistance to Temperature Equation: A+B ( LnR ) +C(LnR) -273.2 +D(LnR) Equation 7 - Convert Thermistor, Type 103JL1A, Resistance to Temperature Where: T = Temperature in °C. LnR = Natural Log of Thermistor Resistance = 1.12766979300187 × 10 -3 = 2.34444184128213 ×...
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Page 59: Appendix F. Networking
APPENDIX F. NETWORKING F.1 Description The Model LC-2x4 Datalogger is capable of being networked by way of a single, optically-isolated RS- 485 communications cable. Utilizing one 8001-5 (RS-232) or 8002-5 (USB) RS-485 interface adapter at the computer (data collection) end, up to 256 Model LC-2x4 Dataloggers* can be networked. Also, the maximum network length* can be up to 1.22 km (4000 ft.). - Page 60 Note that the datalogger ID, which is the first entry for each ASCII character string, corresponds to the network address. This should be set by the user during initial datalogger setup via the ID command. Typing E<ENTER> puts the datalogger back to sleep and disconnects it from the RS-485 bus. The datalogger will continue to wake up periodically (scan rate setting) to take a data reading.
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Page 61: Appendix G. Lithium Coin Cell
2x4 datalogger. In order to maintain the correct date and time settings for those periods when the D cells are removed, the LC-2x4 datalogger incorporates a 3-volt lithium coin cell (Panasonic CR2032) to supply operating current to the internal Real Time Clock. - Page 62 9) Insert the replacement lithium coin cell into the battery holder (+ side facing out). 10) Re-install the printed circuit board back into the enclosure. 11) Thread the four standoffs onto the set screws, using the nut driver to gently tighten the standoffs. 12) Reconnect the two-wire Molex connector to the header labeled “3V”...
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Page 63: Appendix H. Model 8032-27 And Load Cell Wiring
Table 17 - Common Conductor Chart White's black and Green wires are switched on Geokon three-gage VW load cells prior to serial number 3313. The following wiring chart details the connections between the load cell, the 8032-27, and the multiplexer board:... -
Page 64: Appendix I. Battery Replacement Instructions For Units Manufactured Before September 2018
APPENDIX I. BATTERY REPLACEMENT INSTRUCTIONS FOR UNITS MANUFACTURED BEFORE SEPTEMBER 2018 1) Remove the four captive lock regular head screws on the top of the case and lift the cover off. Underneath the cover is the 'D' cell battery holder. 2) Remove the two batteries from the holder being careful not to bend the sides outward.
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