BA6010, BA6011
Battery Analyzer
User Manual
Safety Summary
The following safety precautions apply to both operating and maintenance personnel and must be followed during
all phases of operation, service, and repair of this instrument.
Before applying power to this instrument:
• Read and understand the safety and operational information in this manual.
• Apply all the listed safety precautions.
• Verify that the voltage selector at the line power cord input is set to the correct line voltage. Operating the
instrument at an incorrect line voltage will void the warranty.
• Make all connections to the instrument before applying power.
• Do not operate the instrument in ways not specified by this manual or by B&K Precision.
Failure to comply with these precautions or with warnings elsewhere in this manual violates the safety standards
of design, manufacture, and intended use of the instrument. B&K Precision assumes no liability for a customer’s
failure to comply with these requirements.
Category rating
The IEC 61010 standard defines safety category ratings that specify the amount of electrical energy available and
the voltage impulses that may occur on electrical conductors associated with these category ratings. The category
rating is a Roman numeral of I, II, III, or IV. This rating is also accompanied by a maximum voltage of the circuit to
be tested, which defines the voltage impulses expected and required insulation clearances. These categories are:
Category I (CAT I): Measurement instruments whose measurement inputs are not intended to be connected to
the mains supply. The voltages in the environment are typically derived from a limited-energy transformer
or a baery.
Category II (CAT II): Measurement instruments whose measurement inputs are meant to be connected to the
mains supply at a standard wall outlet or similar sources. Example measurement environments are portable
tools and household appliances.
Category III (CAT III): Measurement instruments whose measurement inputs are meant to be connected to the
mains installation of a building. Examples are measurements inside a building’s circuit breaker panel or the
wiring of permanently-installed motors.
Category IV (CAT IV): Measurement instruments whose measurement inputs are meant to be connected to the
primary power entering a building or other outdoor wiring.
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Do not use this instrument in an electrical environment with a higher category rating than what is specified in
this manual for this instrument.
You must ensure that each accessory you use with this instrument has a category rating equal to or higher than
the instrument’s category rating to maintain the instrument’s category rating. Failure to do so will lower the
category rating of the measuring system.
Electrical Power
This instrument is intended to be powered from a CATEGORY II mains power environment. The mains power
should be 115 V RMS or 230 V RMS. Use only the power cord supplied with the instrument and ensure it is
appropriate for your country of use.
Ground the Instrument
iii
To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical safety ground.
This instrument is grounded through the ground conductor of the supplied, three-conductor AC line power cable.
The power cable must be plugged into an approved three-conductor electrical outlet. The power jack and mating
plug of the power cable meet IEC safety standards.
Do not alter or defeat the ground connection. Without the safety ground connection, all accessible conductive
parts (including control knobs) may provide an electric shock. Failure to use a properly-grounded approved outlet
and the recommended three-conductor AC line power cable may result in injury or death.
Unless otherwise stated, a ground connection on the instrument’s front or rear panel is for a reference of potential
only and is not to be used as a safety ground. Do not operate in an explosive or flammable atmosphere.
Do not operate the instrument in the presence of flammable gases or vapors, fumes, or finely-divided particulates.
The instrument is designed to be used in oice-type indoor environments. Do not operate the instrument
• In the presence of noxious, corrosive, or flammable fumes, gases, vapors, chemicals, or finely-divided
particulates.
• In relative humidity conditions outside the instrument’s specifications.
• In environments where there is a danger of any liquid being spilled on the instrument or where any liquid
can condense on the instrument.
• In air temperatures exceeding the specified operating temperatures.
• In atmospheric pressures outside the specified altitude limits or where the surrounding gas is not air.
• In environments with restricted cooling air flow, even if the air temperatures are within specifications.
• In direct sunlight.
This instrument is intended to be used in an indoor pollution degree 2 environment. The operating temperature
range is 0◦C to 40◦C and 20% to 80% relative humidity, with no condensation allowed. Measurements made by
this instrument may be outside specifications if the instrument is used in non-oice-type environments. Such
environments may include rapid temperature or humidity changes, sunlight, vibration and/or mechanical shocks,
acoustic noise, electrical noise, strong electric fields, or strong magnetic fields.
Do not operate instrument if damaged
If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or other material gets on or inside
the instrument, remove the instrument’s power cord, remove the instrument from service, label it as not to be
operated, and return the instrument to B&K Precision for repair. Notify B&K Precision of the nature of any
contamination of the instrument.
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Clean the instrument only as instructed
Do not clean the instrument, its switches, or its terminals with contact cleaners, abrasives, lubricants, solvents,
acids/bases, or other such chemicals. Clean the instrument only with a clean dry lint-free cloth or as instructed in
this manual. Not for critical applications
This instrument is not authorized for use in contact with the human body or for use as a component in a
life-support device or system.
Do not touch live circuits
Instrument covers must not be removed by operating personnel. Component replacement and internal
adjustments must be made by qualified service-trained maintenance personnel who are aware of the hazards
involved when the instrument’s covers and shields are removed. Under certain conditions, even with the power
cord removed, dangerous voltages may exist when the covers are removed. To avoid injuries, always disconnect
the power cord from the instrument, disconnect all other connections (for example, test leads, computer interface
cables, etc.), discharge all circuits, and verify there are no hazardous voltages present on any conductors by
measurements with a properly-operating voltage-sensing device before touching any internal parts. Verify the
voltage-sensing device is working properly before and aer making the measurements by testing with
known-operating voltage sources and test for both DC and AC voltages. Do not aempt any service or adjustment
unless another person capable of rendering first aid and resuscitation is present.
Do not insert any object into an instrument’s ventilation openings or other openings.
Hazardous voltages may be present in unexpected locations in circuitry being tested when a fault condition in the
circuit exists.
Fuse replacement must be done by qualified service-trained maintenance personnel who are aware of the
instrument’s fuse requirements and safe replacement procedures. Disconnect the instrument from the power line
before replacing fuses. Replace fuses only with new fuses of the fuse types, voltage ratings, and current ratings
specified in this manual or on the back of the instrument. Failure to do so may damage the instrument, lead to a
safety hazard, or cause a fire. Failure to use the specified fuses will void the warranty.
Servicing
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Do not substitute parts that are not approved by B&K Precision or modify this instrument. Return the instrument
to B&K Precision for service and repair to ensure that safety and performance features are maintained.
For continued safe use of the instrument
• Do not place heavy objects on the instrument.
• Do not obstruct cooling air flow to the instrument.
• Do not place a hot soldering iron on the instrument.
• Do not pull the instrument with the power cord, connected probe, or connected test lead.
• Do not move the instrument when a probe is connected to a circuit being tested.
CE Declaration of Conformity
Safety testing has been performed on submied samples and found in compliance with the council LVD directive
2014/35/EU.
• EN 61010-1:2010
• EN 61010-2-030:2010
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Safety Symbols
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DANGER indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury
CAUTION indicates a hazardous situation which, if not avoided, will
result in minor or moderate injury
A Caution. Refer to the text near the symbol.
Electric Shock hazard
Alternating current (AC)
Chassis ground
Earth ground
On (Power). This is the In position of the power switch when instrument is ON.
O (Power). This is the Out position of the power switch when instrument is OFF.
NOTICE is used to address practices not related to physical injury.
Contents
Contents viii
1 Product Overview 1
1.1 Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Geing Started 5
2.1 Input Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Fuse Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Preliminary Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Connecting Kelvin Clips (TLKB1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Operation 10
3.1 Front Panel Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.1 Key Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.2 Screen Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.3 Reset Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Menu Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Numeric Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 System Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.1 System Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.2 Default Seings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Short Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5 Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5.1 L,C,X,R accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5.2 ality and Dissipation Factor Accuracies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5.3 θ Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5.4 Example baery measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.6 Saving Measurement Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.7 Main Measurement Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.8 Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.8.1 Measurement Parameters, Ranges and Options . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.8.2 Measurement Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.9 BIN Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.9.1 BIN Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.9.2 BIN Sorting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.9.3 Compare Pass/Fail Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.9.4 BIN Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.9.5 BIN function setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.9.6 Saving BIN Comparator Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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CONTENTS ix
3.10 Trace Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.10.1 Trace Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.10.2 Trace Display Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.10.3 Start a Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.11 Statistical Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.11.1 Statistical Measurement Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4 File System 40
4.1 Save current seings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2 Load saved seings to active seings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.3 External Memory (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.4 Save/Recall Instrument Seings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.4.1 Save seings to internal memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5 Remote Operation 46
5.1 Remote Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.1.1 RS232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.1.2 USBTMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.1.3 USBVCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.2 Handler Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6 Specifications 50
7 Troubleshooting Information 53
8 LIMITED THREE-YEAR WARRANTY 54
9 Service Information 55
Chapter 1
Product Overview
The B&K Precision models 6010 and 6011 baery analyzers enable far beer accuracy than previous oerings.
With the BA6011 featuring an input range up to 300V, measurement of a greater range of baery configurations is
possible.
Features:
• Best accuracy 0.05%
• Test frequency 1kHz
• Bin sorting comparator
• Adjustable measurement speed for fast readout or beer accuracy
• USB, GPIB and Ethernet interfaces come standard
• Save and recall up to 100 measurement setups
(10 internal, and 90 external (USB stick) records)
• 4.3” color TFT LCD with 480 x 272 pixels
1.1 Package Contents
Please inspect the instrument mechanically and electrically upon receiving it. Unpack all items from the shipping
carton, and check for obvious signs of physical damage that may have occurred during transport. Report any
damage to the shipping agent immediately. Save the original packing carton for future shipping and storage.
Every instrument ships with the following contents:
• 1 x Model BA6010/BA6011 Baery Tester
• 1 x User Manual
• 1 x AC power cord
• 1 x 4-wire kelvin clips
• 1 x Certificate of calibration
• 1 x Test report
Verify that all items above are included in the shipping container. If anything is missing, please contact B&K
Precision.
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CHAPTER 1. PRODUCT OVERVIEW 2
1.2 Front Panel
Figure 1.1: Front Panel
USB Host Port
Power On/O Switch
Function Keys
Corresponds to on-screen menu items
LCUR, LPOT, HPOT, HCUR Input Terminals
Note: LCUR center pin is connected to
ground.
Navigation Arrow Keys
(Up), (Down), (Le), (Right), (Down x 2) Keys
for navigating on-screen and selecting parameters, file menu, and tools menu.
Bin Comparator Pass/Fail Indicator
– PASS – FAIL
For storing/recalling setups,
measurements and screen capturing.
Lock, Copy, Reset, Trig Keys
Numeric Keypad
Positive/Negative sign and backspace buon.
Display (DISP) and Setup Keys
Selects display menu and setup menu.
480 x 272 dot-matrix Color LCD Display
CHAPTER 1. PRODUCT OVERVIEW 3
1.3 Rear Panel
Figure 1.2: Rear Panel
AC Power Input Handler Interface
36-pin handler interface (Centronix type)
BNC Trigger Terminal Fuse/Line Voltage Selector Box
110V or 220V AC Input Selectable
USB Interface supporting:
USBTMC, USBCDC (virtual COM)
RS-232 Interface
Accepts null modem or cross over serial DE-9
cable
Chassis Ground Terminal
CHAPTER 1. PRODUCT OVERVIEW 4
1.4 Display
Figure 1.3: Front Panel
Menu Title
Indicates the current menu display.
So Menu
Displays so menu options relevant to current
display.
Measurement Display
Displays additional measurement readings.
Primary/Secondary Measurement Display
Displays the primary and secondary measurements of the selected functions.
File Menu
Select to enter the file menu system.
File Menu
Tools Menu
Select to enter the tool menu relevant to the current menu.
External USB Disk Indicator
Message Prompt
Prompts status, actions, and errors for various
operations.
Chapter 2
Geing Started
Before connecting and powering up the instrument, thoroughly review the instructions and information in this
chapter.
2.1 Input Power Requirements
The instrument has a selectable AC input that accepts line voltage and frequency input within:
AC Input: 110 V ±10% or 220 V ±10%
Frequency: 47 — 63 Hz
Before connecting to an AC outlet or external power source, be sure that the line voltage selector is installed in the
correct position of 110 V or 220 V and the power switch is in the OFF position. Also, verify that the AC power cord,
including the extension line, is compatible with the rated voltage/current and that there is suicient circuit
capacity for the power supply. Once verified, connect the cable firmly.
The included AC power cord is safety certified for this instrument operating in rated
range. To change a cable or add an extension cable, be sure that it can meet the
required power ratings for this instrument. Any misuse with wrong or unsafe cables
will void the warranty.
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CHAPTER 2. GETTING STARTED 6
2.2 Fuse Requirements
An AC input fuse is necessary when powering the instrument. The fuse is located at the back of the instrument. If
the fuse needs to be replaced, ensure the AC input power cord is disconnected from the instrument prior to
replacement. Refer to Table 2.1 for fuse requirements.
Before replacing fuse, disconnect the AC power cord first to prevent electric shock.
Only use same rating of the fuse. Using a dierent fuse may damage the instrument.
110 V Fuse 220 V Fuse
T 2 AL, 250 V T 1 AL, 250 V
Table 2.1: Fuses
2.2.1 Fuse Replacement
1. Check and/or Change Fuse
• Locate the fuse box above the AC input in the rear panel.
• With 2 fingers, press both le and right sides of the fuse box and pull it out.
• Check and replace fuse (if necessary) for the required line voltage operation.
2. Check and/or Change Line Voltage
Line voltage is selected and configured via fuse holder orientation.
• The beige colored piece is the fuse holder and line voltage selector. To change the line voltage
configuration between 110 V and 220 V, pull this piece out of the fuse box and rotate it 180 degrees.
• Re–insert the fuse box. The configured line voltage is visible through an opening visible at the end of
the holder. It will display either 110 or 220. If neither of these labels is shown, pull out the fuse holder
and turn it until it shows the line voltage configuration desired.
Figure 2.1: Change Line Voltage Configuration
Do not connect power to the instrument until the line voltage is configured correctly.
Applying an incorrect line voltage or configuring the line voltage improperly will
damage the instrument and void all warranty.
Disassembly of the case by any unauthorized persons will void the warranty.
CHAPTER 2. GETTING STARTED 7
Figure 2.2: Change Line Voltage Configuration
CHAPTER 2. GETTING STARTED 8
2.3 Preliminary Check
1. Verify AC Input Voltage
Verify and check to make sure proper AC voltages are available to power the instrument. The AC voltage
range must meet the acceptable specification as explained in section 2.1.
2. Connect Power
Connect AC power cord to the AC receptacle in the rear panel. The power buon on the front panel should
illuminate red. Press the power buon to turn ON the instrument. The buon should illuminate green, and
show the boot screen while loading. Aer loading, the main screen will be displayed (Figure 2.3), and if
password protection is enabled it will prompt the user for the password.
Enter the password and press the function key below [Enter].
Default Password: 2523
Figure 2.3: Password Entry
2.4 Password Protection
The instrument has a password protection feature that allows the instrument to be locked at boot time to prevent
unauthorized users from using it. The default password is: 2523
To change the password, select the Password parameter from the System Setup menu, and select the Modify
so menu option. The user is prompted with “Input password:”. Enter the current password (or default password if
this is setup for the first time), then press Enter. Then, “New password:” prompt will appear. Enter your new
password. The password MUST be numeric and must be 1 — 8 numbers in length.
This instrument does not have a recovery mechanism to retrieve forgoen passwords.
Once password protection is enabled, the instrument will be locked during boot-up until the password is entered.
2.5 Connecting Kelvin Clips (TLKB1)
The instrument comes included with the TLKB1 Kelvin clips accessory (Figure 2.4) which connects to the four
BNC connectors. To connect, align all four BNC connectors of the TLKB1 to the input terminals of the instrument.
Ensure that the connectors slide all the way into each terminal (you may need to adjust the BNC lock rings).
Then, turn the lock rings of each terminal all the way to the right for a secure connection.
CHAPTER 2. GETTING STARTED 9
Figure 2.4: TLKB1 Kelvin Clips
Chapter 3
Operation
There are two main menu groups: “Display” and “Setup”. Each menu may include File and/or too
Display Menu - Accessible by pressing the buon.
MEAS DISP Section 3.7
BIN DISP Section 3.9
TRACE DISP Section 3.10
STATIS DISP Section 3.11
Setup Menu - Accessible by pressing the buon.
MEAS SETUP Section 3.8
BIN SETUP Section 3.9.5
TRACE SETUP Section 3.10.1
STATIS SETUP Section 3.11
File Menu Accessible by using the arrow keys to select [FILE] on-screen. The file system is accessible in all
menus.
Tools Menu Accessible by using the arrow keys to select [TOOLS] on-screen.
The Tools menu is only available for display menus and will not appear in setup menus. Each display menu (i.e.
MEAS DISP, BIN DISP, TRACE DISP, STATIS DISP) has dierent options available.
3.1 Front Panel Keys
3.1.1 Key Lock
The front panel buons are locked by pressing the buon or via remote command. When enabled, all
buons except and are disabled, and the lock buon will illuminate red, . The lock icon also
appears in the upper right corner of the screen.
To disable key lock, press the buon.
10
CHAPTER 3. OPERATION 11
3.1.2 Screen Capture
The display screen may be captured and saved as a .GIF file to an external USB flash drive.
1. Insert a USB flash drive into the front USB host port and wait for the USB icon to appear in the upper
right corner of the screen.
2. Press the buon.
A message prompt will say “Screen Copy .. . ”.
3. Wait until the message says “Copy completed.” and disappears.
The screenshot will be saved into the USB subfolder /PIC.
3.1.3 Reset Key
The reset key initiates a reboot of the system.
3.2 Menu Operation
1. Press the buon or the buon to access the display or setup menus.
2. At the boom of the screen, related so menu items are displayed. Use the function keys to select the
corresponding so menu times that are directly above them. Each item has its own unique display showing
setup parameters, measurements, and more.
3. Use the , , , or arrow keys to select the on-screen parameters of the [FILE] or [TOOLS]
menus. Selected items are highlighted in BLUE .
Figure 3.1: So Menu
4. Most on-screen parameters, when selected, will have options to select or change using the so menu at the
boom of the screen.
5. If an on-screen parameter is numeric, the keypad may be used to enter and change the values. Numeric
values are highlighted in RED , and additional items in the so menu will be available to set the units
(u, m, k, x1). To enter a negative value, press the buon first, and then enter the number. The
buon is also the backspace buon, and works in the usual way.
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