Dillon FI-127 User Manual

FI-127 Force Indicator User’s Manual
Risk of electrical shock. Do not remove cover. No user serviceable
parts inside. Refer servicing to qualified service personnel.
Weigh-Tronix reserves the right to change
specifications at any time.
06/30/98 FI127USE.P65 PN 29653-0017B Printed in USA
2
Table of Contents
Introduction ............................................................................................................................................................................... 5
Operating Modes ...................................................................................................................................................................... 5
Front Panel ................................................................................................................................................................................. 6
Keys6
Standard Instrument Keys ................................................................................................................................... 6
Function Keys ......................................................................................................................................................... 6
Keypad Keys ............................................................................................................................................................ 7
Directional Keys ..................................................................................................................................................... 7
Annunciators .................................................................................................................................................................... 7
Error Messages ......................................................................................................................................................................... 8
Using Your FI-127 .................................................................................................................................................................... 9
Setting Up Your FI-127 .................................................................................................................................................. 9
Performing a Force Measurement .............................................................................................................................. 9
Using the Function Keys.............................................................................................................................................. 10
F1 Key ..................................................................................................................................................................... 10
F2 Key ..................................................................................................................................................................... 11
F3 Key ..................................................................................................................................................................... 11
Using the User Menu ............................................................................................................................................................ 12
The User Menu.............................................................................................................................................................. 12
Capture .................................................................................................................................................................. 12
Hour ........................................................................................................................................................................ 14
Day .......................................................................................................................................................................... 14
Database ................................................................................................................................................................. 15
Loadcell ................................................................................................................................................................... 16
Bounds .................................................................................................................................................................... 17
Using the Service Menu ........................................................................................................................................................ 18
About Menu ................................................................................................................................................................... 18
Audit Menu ..................................................................................................................................................................... 19
Abuse Menu .................................................................................................................................................................... 20
Zero Menu ...................................................................................................................................................................... 20
Test Menu ....................................................................................................................................................................... 21
Setup Menu ..................................................................................................................................................................... 24
Units submenu ...................................................................................................................................................... 24
Loadcells submenu ............................................................................................................................................... 26
Options submenu ................................................................................................................................................ 32
Serial submenu...................................................................................................................................................... 41
B.C.D. Out submenu .......................................................................................................................................... 42
Analog submenu ................................................................................................................................................... 42
Outputs submenu ................................................................................................................................................ 43
Inputs submenu .................................................................................................................................................... 44
Seal submenu ........................................................................................................................................................ 44
Reset Menu / Master Clear ................................................................................................................................................ 47
Adding and Calibrating a Loadcell ...................................................................................................................................... 48
Adding a Loadcell .......................................................................................................................................................... 48
Calibrating a Loadcell ................................................................................................................................................... 49
Step by Step Instructions...................................................................................................................................................... 52
Strings .............................................................................................................................................................................. 52
Layouts ............................................................................................................................................................................. 54
Groups ............................................................................................................................................................................. 56
Freeze Force Function .......................................................................................................................................................... 58
Control ............................................................................................................................................................................ 58
Display.............................................................................................................................................................................. 58
Keypad ............................................................................................................................................................................. 58
Outputs ........................................................................................................................................................................... 58
Data Capture ........................................................................................................................................................................... 59
Control ............................................................................................................................................................................ 59
Display.............................................................................................................................................................................. 59
Keypad ............................................................................................................................................................................. 59
Outputs ........................................................................................................................................................................... 59
Notes ............................................................................................................................................................................... 59
Appendix A: ASCII Control Codes ................................................................................................................................. 60
Appendix B: Default Layouts and Examples ................................................................................................................. 61
Appendix C: Tips on Setting Up and Using the Harmonizer®................................................................................. 63
Appendix D: Cable Pinouts ............................................................................................................................................... 64
3
FI-127 Specifications
Power requirements:
115 Volts AC, +10% to -15% @ 0.3Amp maximum 230 Volts AC, +10% to -15% @ 0.15 AMP maximum 50 /60 Hz
Excitation: 10 Volts DC
Supports up to twelve 350-ohm weight sensors
Operational keys:
Five yellow standard keys: Select, Peak Reset, Data Send, Zero, Units Three function keys: F1, F2, F3 Numeric keys: 0-9
Operational annunciators:
Tension, Compression, Under, Accept, Over, Print, Zero, and Motion Three units of measure
Display: Eight digit, seven segment, 0. 8-inch high LED
Display rate: Selectable (1, 2, 5, 10)
Analog to digital conversion rate: 60 times per second
Calibration Memory: Six loadcell calibration memory
Unit of measure:
Three, independently programmable: Pounds force, kilograms force, grams force, ounces force, ton force, tonne force, custom, Off
Standard outputs:
Three outputs, open collector design Relay power supply, 24 VDC at 150mA 5 VDC at 200 mA for scanner power source Bidirectional serial port (RS-232 or RS-422/485 or
20mA current loop)
Self diagnostics:
Display, keys, inputs, outputs, serial port, A to D converter, loadcell output display, voltages
Circuitry protection: RFI, EMI, and ESD protection
Options:
Two additional serial ports BCD parallel 10 cutoffs Analog output
0-5, 0-10 volts 1-5, 4-20, 10-50 mA
Operating temperature:
-40 to 140° F (-40 to 60° C) 100% relative humidity including washdown
Enclosure: NEMA 4X stainless steel enclosure
Dimensions:
12" W x 8" H x 4" D (without mounting bracket)
12.3" W x 11.0" H x 5.3" D (with mounting bracket)
Capacity selections:
999,999 with decimal located from zero to five places
Incremental selections:
Multiples and submultiples of 1, 2, 5
Programmable selections:
Zero range, motion detection, five-point linearization.
Time and date / RAM:
Battery backed up real time clock and RAM are standard
Internal resolution: 6,291,456 counts per mV/V per sec.
HarmonizerTM digital filtering:
Fully programmable to ignore noise and vibration
Standard inputs:
Seven logic level inputs for functions such as foot switch inputs, freeze reading inputs, PLC control, etc.
Weight: 12.5 lb, 5.7 kg
Agencies:
CUL pending
Warranty: 2 year
4
Introduction
Major sections of this manual are separated by the large black bars as seen above and below. Subsections are titled in this lefthand column. Notes, definitions, and other information also appear in this column
The model FI-127 is a versatile, full-featured indicator housed in a stainless steel enclosure. Its user interface includes an 8-digit, 7-segment LED display, fourteen LED annunciators, and 24 keys.
This manual is divided into the following major sections:
• Introduction
• Operating Modes
• Front Panel
• Error Messages
• Using Your FI-127
• Using the User Menu
• Using the Service Menu
• Reset Menu/Master Clear
• Adding and Calibrating a Loadcell
• Step by Step Instructions
• Freeze Force Function
• Data Capture
Operating Modes
There are three modes of operation for the FI-127—Display mode, User Menu mode and Service Menu mode.
In Display mode you perform all normal force measurement operations.
The User and Service menus give you access to testing modes, configuration of your system, database and system information. This manual explains how to use these different modes of operation.
5
Front Panel
The FI-127's front panel consists of 24 keys and fourteen annunciators.
Keys
Standard Instrument Keys
Function Keys
Figure 1
FI-127 Front Panel
The FI-127's keys are divided into four primary groups:
Standard Instrument Keys These yellow keys are common to a majority of applications and include SELECT, PEAK RESET, DATA SEND, ZERO, and UNITS. The SELECT and UNITS keys are placed next to the annunciators they affect.
SELECT Use to switch between force, peak ad first peak display modes.
SELECT can also be used to accept a current selection and
return to weigh mode from within any menu.
PEAK RESET Use to reset all peak and first peak values. This key may also be
used to capture the current measurement as an entered value during data entry.
DATA SEND Use to initiate one or more serial outputs.
ZERO Zeros the scale in the display mode. Also clears values in
numeric entry.
UNITS Switches the units of measure in the display mode. Up to three
units of measure are selectable.
Function Keys These oval keys along the right side of the display face are configurable and are labeled F1, F2, and F3. The default configurations for these keys are:
F1 Allows load cell selection F2 Allows entry of ID number F3 Allows access to cutoff registers.
6
Keypad Keys
Keypad Keys These are the twelve square keys which support numeric entry.
The keyboard keys are labelled 0-9, plus/minus (+/-), and decimal point (.) and are located near the center of the display face.
+/- This key is used to change the sign of a numeric entry, enter a dash in ID
entry, and insert when editing lists. This key also initiates numeric entry, except in display mode where it serves to toggle between tension and compression for bidirectional cells. Toggling between tension and compres­sion resets peak, first peak and break detect; unfreezes the force display; and halts data capture.
Directional Keys
Directional Keys The directional keys are used to navigate through the FI-127's menus. These keys are labeled ESCAPE (up), ENTER (down), MENU (right) and are positioned in a compass-like cluster on the display face.
These directional keys are denoted by the small transparent arrows located next to them. ESCAPE, ENTER, and
ESCAPE Exits a menu parameter without saving any changes. This key moves
up within a menu. In display mode, ESCAPE "unfreezes" the force display.
ENTER Used to end digit entry, accept a change made, or select an item
from a function list. ENTER moves down within a menu. When in display mode, ENTER "unfreezes" the force display.
ÅÅ
Å Backspaces (deletes the last digit or punctuation mark entered)
ÅÅ
while in numeric entry and moves left within a menu.
MENU Accesses user menus and moves right within a menu.
also support numeric entry.
(left), and
Annunciators
The FI-127 has fourteen annunciators.
Force Illuminates when indicator is in force display mode.
Peak Illuminates when indicator is in peak display mode.
1st Peak Illuminates when indicator is in first peak display mode.
lbf, kgf, N Illuminates the active unit of measure in weighing mode.
Data Send: Illuminates when the indicator is transmitting data.
Does not illuminate when a host connection is communicating with the indicator or with continuous send.
Zero: Illuminates when the scale is within the configured center
of zero.
Motion: Illuminates when the scale detects motion (within configured motion window).
Under, Accept, Over Specific application annunciators.
Tension Indicates the type of force being measured.
Compression Indicates the type of force being measured.
7
Error Messages
The following are displays you may see if problems occur or if invalid operations are attempted with your FI-127:
Display Description
O. LoAd
L.C. Error
Auto. 0
Overrange force.
Underrange force.
Recovering from lock-up or out of range condition.
A-D converter is not functioning.
A-D converter subjected to an input signal beyond ±5.00000 mV/V
The unit cannot perform a function. Displayed only while key is held down.
Corrupted data in the reset menus. See the Service Manual. (* = RESET, SETUP, or CAL)
Displayed while a key is pressed when attempting to modify a sealed selection without edit privileges.
Displayed while waiting for a stable, valid weight to use as a zero reference on power-up.
Displayed when input voltage to excitation regulator drops below
10.5 VDC. Will clear when input voltage rises above 11.5 VDC.
1 Busy
Ouch
Displayed when the ready/busy handshake has exceeded its time out limit. Default is 2 seconds. This can also apply to optional 2nd and 3rd serial ports.
Displayed when the force applied to the load cell has exceeded the level considered to be abusive to the load cell.
8
Using Your FI-127
Setting Up Your FI-127
Performing a Force Measurement
First Peak
First peak is defined as an applied force, followed by a drop in force of at least x% of full capacity followed by an ultimate peak in force. x is called the capture percentage. You can set this percentage via the front panel. Instructions can be found in the section Using the Service Menu. See the graphed example in Figure 2.
Your FI-127 will probably be ready to use when you receive it from your Dillon distributor. Connect the loadcell to the 7-pin connector on the back of the unit. Connect your RS-232 communication equipment to the other connector on back of the FI-127. Power up your peripheral equipment and plug in the FI-127 to an appropriate grounded power source.
The indicator will power up in Display mode with annunciators lit for your application. From the factory, the default annunciators which are lit are Force, Tension and lb F. The center of zero (COZ) annunciator should also be lit. If the display does not show 0 or the COZ annunciator is not lit, press the ZERO key.
Your unit is now ready for use in your force measurement application. If you want to add a loadcell, see the section Adding a Loadcell later in this manual.
1. With the indicator powered up, select the unit of measure you want to use by pressing the UNITS key. . . The proper annunciator will light.
2. Press the ZERO key if the display does not show 0 and apply force to the loadcell. . . The force will be displayed in the unit
of measure you have chosen. The type of force, tension or compression, will be indicated by the annunciators under the display. The motion annunciator will be lit while the indicator detects motion.
3. If you are running a test where First Peak and Peak readings are important to you, you can see those values by pressing the SELECT key. The value on the display will correspond to the annunciated item on the left side of the display panel. See the First Peak definition at left.
4. After you have seen the peak values, you can reset them by removing the force from the load­cell and pressing the PEAK RESET key.
5. Repeat steps 2-4 for the other force measurements you want to make.
9
Full Scale Capacity of Loadcell
First peak illustration
Time
Figure 2
Using the Function Keys
F1 Key
The function keys are used for
F1 Loadcell selection
F2 ID number entry
F3 Viewing or entering data in cutoff registers
1. Press F1 key. . . The display shows the current cell number and a letter showing if the cell type is F for force or T for torque.
2. Press the ENTER key. . . The capacity of the current cell is displayed.
3. Press the MENU key. . . The division size for the current cell is displayed.
4. Press the ENTER key to return to
Display mode or press the ESCAPE key to return to the display from step 1.
10
F2 Key
1. Press the F2 key. . . The current ID number is displayed.
2. Press any of the following keys to return to Display mode:
ÅÅ
F2,
Å, MENU, ESCAPE,
ÅÅ
SELECT
or
press a number key to start entering a new ID number. When you are finished, press the ENTER key. . . The new number will become the
active ID number.
F3 Key
Cutoff Register
A cutoff register is a force value you enter into memory (register) which the indicator uses to control outputs. There are 10 cutoff registers in the FI-127. You can set ten different force values which the indicator will use to trigger outputs.
When activated (force on the loadcell is less than the force in the cutoff registers), these cutoffs are all on at the same time. Each cutoff will deactivate as soon as the force on the loadcell matches the value in each cutoff register.
When the force is equal to or greater than positive register values, or more negative than negative register values, the corresponding output is disabled.
When the force is less than the positive register values, or less negative than negative register values, the corresponding output is enabled.
The F3 key is used to view and change cutoff registers. You can view cutoff registers by two methods:
Method A:
1. Press the F3 key. . . 1 xx is displayed. The number 1
stands for cutoff register #1 and xx is the current value in register 1.
2. Continue pressing F3 or MENU to scroll forward or backward through the remaining cutoff registers.
Method B:
1. If you know which cutoff register you wish to view, press the number of that register, then press F3. That particular cutoff register is displayed.
To change a cutoff value, display the register you want to change then:
1. Key in a new value with the numeric keypad. Use the +/- key to change the sign of the value.
Press the ENTER key to accept the new value and return to Display mode
or
press the F3 key to accept the new value and move to the next register.
ÅÅ
Å to scroll
ÅÅ
2. To deactivate or clear a cutoff value, set the value to zero.
11
Using the User Menu
Use these keys to navigate through the menus:
ESCAPE =up
ENTER = down
ÅÅ
Å = left
ÅÅ
MENU = right
The FI-127 has two menus—the user menu and the service menu. The service menu is covered later in this manual. You use it to configure the operation of your indicator. The user menu, shown in Figure 3, allows you to do the following things:
• Capture and view data points
• Print a report on data points
• View statistics about captured data points
• Delete captured data points
• View the current time and date
• View and delete database records
• See live display of loadcell output in counts or mV/V
• Set Target, Under, and Over values
The User Menu
Capture
This manual assumes that all functions are enabled. Your indicator may not show some of the items in the user menu because your configuration does not enable them. See the Using the Service Menu section to reconfigure your system.
12
Figure 3
User menu
Following are instructions for accessing and using the user menu. Refer to Figure 3 as you go through these instructions.
1. Press the MENU key. . . CAPturE is displayed. This is the first menu item. Use this to start and stop capturing data points, view captured points, see statistics on captured points and to delete the points.
2. Press the ENTER key. . . StArt or StoP is displayed depending on if you are currently capturing data points or not.
3. Press the ENTER key to start or stop capturing data points. . . The indicator will start or stop captur-
ing data points.
4. Press the MENU key to move to the next menu item. . . rEPOrt is displayed. Use this to print a
report on the data capture information.
5. Press the ENTER key with this displayed if you want a preconfigured set of information to be sent through the serial port.
6. Press the MENU key to move to the next menu item. . . Point is displayed. Use this to see any
captured data point.
7. Press the ENTER key to view the current point number. Press MENU to scroll to other points. With the point you want displayed, press the ENTER key to see the value of that data point. . . The captured point will be displayed as
ÅÅ
Å or
ÅÅ
well as the unit of measure and tension/ compression annunciators.
Remember to use the direction keys to navigate among the levels and choices in the menu structure.
Press SELECT to accept the current selection and return to the Display mode from anywhere in the menus.
8. Press the MENU key to move to the next menu item. . . StAtS. is displayed. Under this item you
can see statistics on the captured data points.
9. Press ENTER to see the first item in the list of statistics. Press the or MENU to move to other stat. items and press ENTER to see the value for the displayed statistic. Following are the statistics and what they show you:
Top Peak value for the currently captured points.
First Shows the first peak value for the currently captured points.
Average Shows the mean value of the currently captured points. Does
not include those points which are below the data capture threshold set in the Ave. Over parameter of the setup menu. See the Service Manual.
Hour Time at which the data was captured.
ÅÅ
Å
ÅÅ
Day Date on which the data was captured.
13
Use these keys to navigate through the menus:
ESCAPE =up
ENTER = down
ÅÅ
Å = left
ÅÅ
MENU = right
10. After viewing the statistics, press the ESCAPE key until StAtS. is displayed, then press MENU to see the next menu item. . . dELEtE is displayed. Use this to delete
all captured data points.
11. Press the ENTER key. . . donE is displayed if there are no data
point to delete. All is displayed if there are data points to delete.
12. If there are data points to delete and you want to delete them, press ENTER while All is displayed. . . The data points are deleted from
memory and donE is displayed.
Hour
13. Press ESCAPE twice to return to the CAPturE display. Press MENU to move to the next user menu item. . . Hour is displayed.
14. Press ENTER to see the currently set time. . . Time is displayed as HH:MM:SS (24
hour clock) or HH:MM:SS AM (12 hour clock). You may toggle between the two formats by pressing the UNITS key.
15. Press ENTER or ESCAPE to leave the time and format unchanged or enter a new time using the numeric keys.
16. After changes have been made to the time, press the ENTER key to accept them and start the clock. . . Display shows Hour.
14
Day
17. Press the MENU key to go to the next menu item. . . dAY is displayed.
18. Press ENTER to see the currently set date. . . The date is displayed as MM/DD/YY.
19. Press ENTER to accept this date or key in a new date and press
ENTER to accept it. . . dAY is displayed.
Database
20. Press the MENU key to go to the next menu item. . . dAtAbASE is displayed. Under this
menu item you can send a preconfigured report of database items to a serial port, look at individual records in the database and delete one or all of the records.
21. Press the ENTER key. . . rEPOrt is displayed. Use this to send a
report to a serial port. The information sent depends on the configuration of your system. See the Service Manual for instructions.
22. Press the ENTER key to send the database information to the serial port. . . The print annunciator will light then the
display will show dAtAbASE again.
23. Press ENTER then MENU to go to the next menu item under dAtAbASE. . . rEcord is displayed.
24. Press the ENTER key to access the current record. . . A record number is displayed.
25. You can view this record's data by pressing the ENTER key
or
you can access other record numbers by pressing the
MENU key, then press the ENTER key. . . The first item in the database record is
26. Use the through the list of items, then press the ENTER key to view the value for each item,
ÅÅ
Å or MENU key to scroll
ÅÅ
ÅÅ
Å or
ÅÅ
displayed. What this item is depends on the configuration of your database.
15
Use these keys to navigate through the menus:
ESCAPE =up
ENTER = down
ÅÅ
Å = left
ÅÅ
MENU = right
Below is a full list of items in default order: Force A stored force measurement. Displayed with unit of measure and
tension/compression annunciators.
Top A stored peak value. Displayed with unit of measure and tension/
compression annunciators.
First A stored first peak value. Displayed with unit of measure and
tension/compression annunciators.
Disp. A stored measurement. May be Force, Top or First depending on
configuration. Press the ENTER key again to see the value. Dis­played as F 1234.5 if the stored value is a frozen force. Displayed with unit of measure and tension/compression annunciators.
Sel. A stored measurement. May be Force, Top or First depending on
configuration. Press the ENTER key again to see the value. Dis­played with unit of measure and tension/compression annunciators.
Loadcell A stored loadcell number.
Id A stored ID number.
Hour Time the record was stored.
Loadcell
Day Date the record was stored.
27. Press ESCAPE until rEcord is displayed, then press the MENU key to move to the next item in the database submenu. . . dELEtE is displayed. Use the items
under this to delete one or all the records.
28, If you choose to delete one record
you can scroll through the records using the press the ENTER key to delete that one record. . . dELEtE is displayed.
29. With dELEtE displayed, press the ESCAPE key. . . dATAbASE is displayed.
30. Press the MENU key to move to the next user menu item. . . LOAdCELL is displayed.
ÅÅ
Å or MENU keys then
ÅÅ
16
31. Press the ENTER key to see a live display of loadcell output in either mV/V or counts. Toggle between the two views using the UNITS key.
Bounds
32. Press the ESCAPE key to return to the LOAdCELL display, then press MENU to move to the last user menu item. . . boundS is displayed. Use this item to
set target, over and under values. See example at left.
Target, Over, Under Example
Target value = 350 Under value = -10 Over value = 20
With these settings the ACCEPT annunciator will be lit when force is 340 to 370. The UNDER annuncia­tor will be lit when force is less than
340. The OVER annunciator will be lit when force is greater than 370.
33. Press the ENTER key. . . OVEr is displayed.
34. Press ENTER to see the current value. Key in a positive value then press ENTER to accept it. . . OVEr is displayed.
35. Press MENU to display UndEr. Press ENTER to see the current value. Key in a negative value then press ENTER to accept it. . . UndEr is displayed.
36. Press MENU to display tArGEt. Press ENTER to see the current value. Key in a value then press ENTER to accept it. . . tArGEt is displayed.
37. This is the last item in the user menu. Press ESCAPE repeatedly or SELECT to return to Display mode.
17
Using the Service Menu
Be sure to key in the password '127' before pressing and holding the ESCAPE key if you want to change items in the service menu, otherwise you will only be able to view them.
You use the service menu to see information about your indicator, to test its various functions and to configure how you want the system to work. Figures 4 through 19 show the service menu structure in the FI-127. Following each figure are explanations for each of the service menu items. Use the same methods to get around in the menu structure as you used in Using The User Menu section of this manual. To edit items in this menu you must key in '127' before pressing
and holding the ESCAPE key.
Figure 4
Top level of the Service menu
About Menu Information about the software
About Menu
Audit Menu Audit counters for calibration and configuration
Abuse Menu Loadcell overload counters
Zero Menu Zero balance information and reset
Test Menu For testing the hardware of the indicator
Setup Menu For configuration of the indicator
18
Figure 5
About menu
Audit Menu
These are the items listed in the
127 The unit designation.
12345 Parent part number of the software.
-1234 The dash portion of the software part number.
Rev. A The revision level of the software.
About menu:
Figure 6
Audit menu
These are the items listed in the Audit menu:
Cal. 0000 This is an example of how the calibration audit trail counter will
appear. The actual value will be between 0000 and 9999. It is nonresettable and may not be edited.
Cfg. 0000 This is an example of how the configuration audit trail counter
will appear. The actual value will be between 0000 and 9999. It is nonresettable and may not be edited. The counter is incremented each time a metrological item is modified in the setup menus and saved and so may be used as a control audit.
19
Abuse Menu
Be sure to key in the password '127' before pressing and holding the ESCAPE key if you want to change items in the service menu, otherwise you will only be able to view them.
Figure 7
Abuse menu
Cell 1 00 This is an example of how a loadcell overload counter appears.
Use the have. The counter shows up to 99 overloads. An overload is defined as an applied force beyond the threshold configured under Abused in the loadcell configuration section of the service menu. The overload counter can only be reset at the factory.
ÅÅ
Å or MENU keys to view other loadcells you may
ÅÅ
Zero Menu
This menu provides access to zero balance information and reset.
Figure 8
Zero menu
12.3 This is an example of the offset between the current zero balance and the zero balance value established in calibration. Displayed offset = Calibration zero - Current zero
When you press the ZERO key the current balance is reset to calibration zero and resets the peak and 1st peak. The force display is also unfrozen.
20
Test Menu
The test menu, shown below, gives you access to diagnostic tests.
Figure 9
Test menu
These are the items listed in the Test menu from left to right:
Display Press ENTER to start and stop a continuous display test. With
the test stopped press the or forward one step at a time. Press ENTER again to resume the automatic test or press ESCAPE to stop the test and return to diSPLAy.
Buttons This provides a test of the keypad. The name of the key that is
pressed appears on the display. If no key is pressed, nOnE is displayed. Press MENU to return to buttonS.
A to D Press this key to see the current A to D value. The displayed
resolution is 1 part in 20,000 per mV/V. This test exists so that the offset and gain of the electronics can be checked. The offset is initially set to the nominal offset of the electronics, but you can press the ZERO key to establish the actual offset, allowing the gain to be evaluated.
ÅÅ
Å or MENU key to move backward
ÅÅ
21
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