Megger BITE 3 User manual

AVTMBITE 3
Rev 8
April 2014
Instruction Manual
BITE 3
Battery Impedance Test Equipment
HIGH VOLTAGE EQUIPMENT
Read this entire manual before operating.
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.
610-676-8500
www.megger.com

BITE 3
Battery Impedance Test Equipment

Copyright© 2004 by Megger. All rights reserved.
The information presented in this manual is believed to be adequate for the intended use of the product.
If the product or its individual instruments are used for purposes other than those specified herein,
confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty
information below. Specifications are subject to change without notice.
WARRANTY
Products supplied by Megger are warranted against defects in material and workmanship for a period of
one year following shipment. Our liability is specifically limited to replacing or repairing, at our option,
defective equipment. Equipment returned to the factory for repair must be shipped prepaid and insured.
Contact your MEGGER representative for instructions and a return authorization (RA) number. Please
indicate all pertinent information, including problem symptoms. Also specify the serial number and the
catalog number of the unit. This warranty does not include batteries, lamps or other expendable items,
where the original manufacturer’s warranty shall apply. We make no other warranty. The warranty is
void in the event of abuse (failure to follow recommended operating procedures) or failure by the
customer to perform specific maintenance as indicated in this manual.
M
Valley Forge Corporate Center
2621 Van Buren Ave
Norristown, PA 19403-2329
610-676-8500 (Telephone)
610-676-8610 (Fax)
www.megger.com

AVTMBITE 3 Rev 8 April 2014
i
Table of Contents

1 INTRODUCTION .............................................................................................................................................1
About the BITE 3… .......................................................................................................................................1
Electrical Theory and Practice .......................................................................................................................2
How the BITE 3 Works .................................................................................................................................2
Applications for the BITE 3 ..........................................................................................................................3
Upon Receipt of the BITE 3..........................................................................................................................3
Safety First ........................................................................................................................................................4
How to Use This Manual................................................................................................................................4
Typographic Conventions ..............................................................................................................................4
2 SAFETY ................................................................................................................................................................5
Overview ...........................................................................................................................................................5
Safety Requirements ........................................................................................................................................5
Cautions and Warnings ...................................................................................................................................6
3 CONTROLS, CONNECTORS, INDICATORS & MENUS .....................................................................7
Overview ...........................................................................................................................................................7
Switches and Connectors................................................................................................................................9
The Battery Module...................................................................................................................................... 13
Battery Charging............................................................................................................................................ 13
4 TEST PROCEDURES .................................................................................................................................... 17
Overview ........................................................................................................................................................ 17
Step One:Perform Pre-Test Activities.................................................................................................. 17
Step Two:Turning on the BITE 3 and Connecting the Lead Set. .................................................... 18
Step Three: Select a Site/String and Take Measurements. ..................................................................... 19
Step Four:Perform Post-Test Activities. ................................................................................................ 19
Reviewing a Test ........................................................................................................................................... 20
Retesting a Cell/Jar or a Strap .................................................................................................................... 20
Analyzing a Test (See Chapter 5)................................................................................................................ 20
Testing Noisy Battery Systems.................................................................................................................... 20
Tests Using Optional Lead Sets.................................................................................................................. 20
Reviewing and retesting ............................................................................................................................... 21
5 Interpreting Test Results .................................................................................................................................. 23
Overview ........................................................................................................................................................ 23
Viewing (Printing) Test Results on the LCD............................................................................................ 23
Instantaneous Mode of Analysis................................................................................................................. 24
Short-term Mode of Analysis...................................................................................................................... 25
Long-term Trending..................................................................................................................................... 25
6 MAINTENANCE AND TROUBLE SHOOTING.................................................................................. 27
Overview ........................................................................................................................................................ 27
Status LEDs................................................................................................................................................... 27
Lead Set .......................................................................................................................................................... 27
Out of Range Impedance Values................................................................................................................ 27

AVTMBITE 3 Rev 8 April 2014
ii
Battery .............................................................................................................................................................28
Probe Tips.......................................................................................................................................................28
Printer (Optional) ..........................................................................................................................................29
Configuration .................................................................................................................................................29
If the BITE 3 Needs Repairs .......................................................................................................................30
APPENDIX A - Technical Specifications..........................................................................................................31
Electrical..........................................................................................................................................................31
Environmental................................................................................................................................................32
Safety ...............................................................................................................................................................32
Mechanical ......................................................................................................................................................32
APPENDIX B - Replaceable Parts ...................................................................................................................33
APPENDIX C - Compatibility ..........................................................................................................................35
Hardware – Unit Firmware Compatibility .................................................................................................35
Software – Firmware Updating....................................................................................................................35
Firmware Modifications................................................................................................................................36
List of Figures
Figure-1: BITE 3 Transceiver................................................................................................................................8
Figure-2: BITE 3 Lead Connections ....................................................................................................................8
Figure 2A: BITE 3 Fuse ..........................................................................................................................................8
Figure-3: BITE 3 Battery Charger Connections .................................................................................................9
Figure-4: BITE 3 Battery Charger Condition....................................................................................................13
Figure-5: Printer Configuration Printout ............................................................................................................29

AVTMBITE 3 Rev 8 April 2014
1
1
INTRODUCTION
About the BITE 3…
NOTE: Before attempting to use the BITE 3, be sure that you read and
understand the safety requirements and operating procedures contained in
this manual.
Thank you for selecting a Megger product. This instrument has been thoroughly
tested and inspected to meet rigid specifications before being shipped.
It is ready for use (after charging the battery for 24 hours) when set up and
operated as described in this manual.
The BITE 3 is a testing device used to evaluate the condition of stationary
battery systems. It measures:
AC impedance, an internal ohmic value,
DC terminal voltage,
Intercell connection resistance,
Float current,
Ripple current, and
Harmonic content
These measurements, along with other maintenance data such as ambient and
cell temperatures, help determine the condition of a battery system.
The BITE 3 is the first instrument of its kind that can be configured through
PC-based software, called Power DB This provides the ultimate in versatility and
ease-of-use. The data from the BITE 3 is uploaded with the click of the mouse
and the site/string is updated with the latest data. Furthermore, the software of
the BITE 3 can be updated via the Internet to ensure that the most recent
updates and enhancements are downloaded to the BITE 3.

M
AVTMBITE 3 Rev 8 April 2014
2
The BITE 3 generates data that describes an overall condition of a battery. Weak
batteries are due to a number of reasons, some of which are sulfated plates, dry-
out (loss-of-compression), loose intercell connectors, grid growth, etc. The BITE
3 also measures float current which increases over time as batteries degrade. In
the case of VRLAs, increasing float current can indicate impending thermal
runaway. [Flooded batteries can’t runaway thermally due to the large volume of
acid which merely boils off limiting battery temperature to about 260 F (125 C).]
Also measured is ripple current which is an indicator of charger output
condition. Battery chargers convert ac into dc but no charger is 100% efficient.
Some ac carries over into the dc network and is called “ac ripple”. If that ripple
current is above about 5% (5A rms per 100Ah) then battery heating can occur
thus shortening batteries’ lives. Normal aging of chargers causes a slow and
tolerable increase in ac ripple. But if a diode blows, ripple current can increase
three to four times which can heat the battery. Measuring ripple current helps to
identify the general condition of the charger output.
Electrical Theory and Practice
A battery string is a series circuit of cells that look like resistors to the applied
current. Current flows due to a voltage applied from the charger. In a series
circuit, Kirchhoff’s law states that the current is the same everywhere in that
circuit. Ohm’s law states that each resistor will have a voltage drop in response to
the applied current regardless of whether that current is ac, dc or both.
Impedance works by applying an ac current signal to the battery and measuring
the resulting voltage drop. Impedance is then calculated using Ohm’s Law,
Z = E/I. To get accurate internal ohmic values (impedance, etc.) the current
must also be measured. A battery is connected in parallel with a load and the
charger and frequently it is connected to other parallel strings. The actual current
can vary based on relative condition and parallel paths for the current. Hence, it
is necessary to measure current that is causing the voltage drop in order to obtain
accurate impedance values.
How the BITE 3 Works
The BITE 3 works by applying an ac current signal across an individual cell/jar
and measuring the ac voltage drop caused by that ac current as well as the
current in the individual cell/jar. It will then calculate the impedance. The
standard lead set used is dual-point, Kelvin-style. One point is for applying the
current and the other for measuring the potential.
In addition to the standard impedance cell voltage and intercell connection
resistance, the BITE 3 uses a patent pending technique to measure float and
rippled currents. The best method to measure current is by measuring the voltage
across a shunt. Megger uses the idea that there are many shunts within a battery.
By first obtaining a strap resistance value, then using that as a shunt, the float and

Introduction
AVTMBITE 3 Rev 8 April 2014
3
ripple currents can be determined. The accuracy of the float and ripple currents
measurements is determined by the shunt value. See the Technical Specification
Section for accuracy.
The BITE 3 does more than take measurements; it also has an on-board, user-
configurable database replete with percent allowable changes. The BITE 3 works
in tandem with Power DB to configure the instrument and site/strings based on
user choices. The BITE 3 and Power DB work together to have the latest data
from Power DB downloaded into the instrument for superior on-board data
analysis. All BITE 3s can then have all of the necessary information and data
regardless of which BITE 3 took the last set of battery data.
Applications for the BITE 3
Some of the many types of installations that can be tested and analyzed with the
BITE 3 are:
Telecommunications – Wireline and Wireless
Substations and Generating Stations
UPS systems
Service Companies
Railroad – Substations and S&C including CTC
Heavy Industrial battery back-up systems
Battery Manufacturing Plants
Emergency Lighting Units
Marine and Military applications
Many Others
Please call Megger or visit our website www.megger.com for more information.
Upon Receipt of the BITE 3
Check the equipment received against the packing list to ensure that all materials
are present. Notify Megger of any shortage (tel [phone].)
The BITE 3 is easily operated by one technician. It is housed in a rugged plastic
case.

M
AVTMBITE 3 Rev 8 April 2014
4
Please examine the instrument for damage received in transit. If you find
damage, file a claim with the carrier at once. Also notify Megger or our nearest
authorized sales representative, and describe the damage in detail.
Safety First
Be sure to read the safety information in Chapter 2 thoroughly and observe all
safety precautions and recommendations.
How to Use This Manual
Typographic Conventions
GCAUTION
Cautions alert you to possible damage to
equipment.
F WARNING
Warnings alert you to conditions that are
potentially hazardous to people.
NOTE: Notes provide important information.

AVTMBITE 3 Rev 8 April 2014
5
2
SAFETY
Overview
The BITE 3 and its recommended operating procedures have been designed
with careful attention to safety. However, it is not possible to eliminate all
hazards from electrical test equipment or to foresee every possible hazard that
may occur. The user not only must follow the safety precautions contained in
this manual, but also must carefully consider all safety aspects of the operation
before proceeding.
Any use of electricity inherently involves some degree of safety hazard. While
Megger has made every effort to reduce the hazard, the operator must assume
responsibility for his or her own safety. Any work on batteries is hazardous and
requires constant attention to safety. You should guard particularly against the
possibility of electrolyte spills, explosion, and electrical shock.
Safety Requirements
This instrument has been designed to the IEC 61010-1 safety standard. Observe
all industry standard safety rules for testing batteries.
The BITE 3 is designed for connection to energized systems.
Always disconnect optional lead sets from the battery under test.
The purpose of this instrument is limited to use as described in this manual.
Do not use the equipment or its accessories in an explosive atmosphere.
Explosive gases such as hydrogen can be present around batteries. Regardless
of room ventilation, verify the conditions before testing.
Wear protective clothing and eye protection.
Ensure that test leads and probes are in good condition
Observe all cautions and warnings in this manual and on the equipment.
This instrument is to be used only by suitably trained personnel who are
familiar with the hazards involved in testing high voltage dc systems.
Safety is the responsibility of the operator.

M
AVTMBITE 3 Rev 8 April 2014
6
Cautions and Warnings
This manual provides cautions and warnings where applicable, and these should
be strictly observed.

AVTMBITE 3 Rev 8 April 2014
7
3
CONTROLS, CONNECTORS, INDICATORS & MENUS
Symbols used on the instrument are:
G
Safety warnings are precautions that must be read and understood
before the instrument is used. Refer to accompanying notes in
manual.
c
Equipment complies with current EU directives.
WEEE (On battery pack)
The crossed out wheeled bin placed on Megger products is a
reminder not to dispose of the product at the end of its life with
general waste. Megger is registered in the UK as a Producer of
Electrical and Electronic Equipment. The Registration No is
WEE/DJ2235XR.
Overview
The front panel of the BITE 3 comprises (clockwise from the top) the
1. Test button (used for optional lead sets)
2. Alpha-numeric keypad (symbols, too)
3. On-off switch, S1 (but it is not labeled S1.)
4. Enter button
5. LCD, ¼ VGA, monochrome
6. Audible alarm
7. Comms/Printer port, J3 (but it is not labeled J3)
8. Cursor Control
9. Menu button
10. Contrast buttons

M
AVTMBITE 3 Rev 8 April 2014
8
Figure-1: BITE 3 Transceiver
The side panels comprise the lead set connection, J1 and the CT connection, J2.
(again, the ports are not labeled Jx)
Figure-2: BITE 3 Lead Connections
Figure 2A: BITE 3 Fuse
The battery charger connection, battery state indicator and slow charge control
are here:
1
3
4
6
7
8
9
2
10
5
J2
J1

Controls, Connectors, Indicators & Menus
AVTMBITE 3 Rev 8 April 2014
9
Figure-3: BITE 3 Battery Charger Connections
Switches and Connectors
S1 switch The on-off switch energizes/de-energizes the
instrument. It takes about 30 seconds to boot-up
and about ten seconds to shut down.
J1 Lead set The lead sets are connected here. The connector is
keyed.
J2 CT The optional external CT, when used, connects into
J2. It is also keyed.
J3 (Com & Printer) The communications and printer cable connects to
J3 to communicate to a PC or laptop and to the
optional printer
J4 Battery charger The output of the charger connects to the battery
here. The instrument is designed to prevent usage
while it is being charged as a safety item.
J5 Battery State The state of the battery is evident by the number of
LED bars when this button is pushed – about 10%
per LED bar. See the section “Battery State
Indicator” below.
J6 Slow Charge By pressing the slow charge button while
connecting the charger, the battery will slow charge
and take about 48 hours. See the section “Battery
State Indicator” below.
J4
J6 J5

M
AVTMBITE 3 Rev 8 April 2014
10
There is also an audible alarm in the instrument body and LEDs on the Dual-
point Lead set to indicate circuit and measurement status. The following chart
details the conditions under which the audible alarm and LEDs activate. The
circuit and measurement status is also displayed on the LCD.
Red No Circuit
Yellow- Blinking Circuit found, not measuring
Yellow- Solid Circuit found, measuring
Green Measuring complete, Okay to remove probes.
LED Status Indicators
No connection
(( )) Connection detected
Measuring
Measurement complete

Controls, Connectors, Indicators & Menus
AVTMBITE 3 Rev 8 April 2014
11
The keypad is used for entering site and string configurations. It is also used to
add comments about the battery or testing that the user may wish to document.
The keys’ character set is:
1( )
2ABC
3DEF
4GHI
5JKL
6MNO
7PQRS
8TUV
9WXYZ
0 (space), _
. ,.# mμ%-( ) /:@!?$=<>’*
The optional CT has two modes of operation: Escape current and impedance
(ripple current). It is necessary to measure “escape current” in short strings in
parallel configurations, mainly found in outside plant telco installations including
wireline and wireless applications. An example of this would be six battery
strings of (4) 12Vdc jars in each string.
In this example, the current from the measurement has parallel paths. The
instrument will measure its output current and the CT will measure the current
that is flowing through the parallel paths. The output current and the escape
current, together, provide accurate impedance values. Other methods that do not
measure current or the BITE 3 without the optional CT may have inherent
errors. By measuring the “escape” current, that is, the current that is not passing
through the battery being tested, it can be subtracted from the output current to
correctly calculate impedance following Ohm’s Law, Z=E/i.

M
AVTMBITE 3 Rev 8 April 2014
12
The flowchart of the menu structure:
Under Configure/Site-Strings/ Delete, it is not possible to delete a Site and/or
String until the data have been deleted first. This is to make sure that a
Site/String is not accidentally deleted. To delete data, go to System/Delete Tests
menu item. You will be asked “Are you sure?”
Measure
New Test
Select a String
(Test screen – starts with
temp (manual entry),
ripple current and float
current measurements
then goes into impedance,
voltage and strap testing
Discard measurement
Comments
Save and Close
Cancel and Close
Append to Test
Select a String
(Test screen – starts with
impedance, voltage and
strap testing. There is no
mechanism for float and
ripple current
measurements.)
Measure current
Measure impedance
Cancel and Close
Quick Test
Spectrum
Analyzer
Analyze
Analyze
Select a Test
Select and Continue
Close
Configure
Instrument
Instrument Name:
Auto Off: (time in seconds)
Line Frequency: (Hz)
Auto Measure: (0/1)
CT Mode: (Escape Current/
Impedance)
System Time: (y/m/d h:m)
Save and Close
Cancel and Close
Sites/Strings
Select a Site or String
New
Enter New Site information
Site:
String Name:
Baseline: (mOhms)
Warning: (%)
Fail: (%)
Change: (%)
Deviation: (%)
Save and New
Save and Close
Cancel and Close
Modify
Modify String Information
(same info as New)
Save and Close
Cancel and Close
Delete
Select a Site or String
Are you sure?
Close
Display
Temperature Units: (F/C)
Language
Date Format
Decimal Symbol: (./,)
Save and Close
Cancel and Close
System
Status
Battery Pack Voltage
Leadset:
Dual Point
AMP/Burndy
Quick Disconnect
Kelvin Clip
CT: none/standard
Close
About
Name:
Version:
Serial number:
Storage space: (%, # tests)
Battery Level: (%)
Current Date:
Close
Factory
(Enter password)
Delete Test
Select Test to Delete
(Are you sure?)

Controls, Connectors, Indicators & Menus
AVTMBITE 3 Rev 8 April 2014
13
The Battery Module
The battery module contains nickel-metal-hydride cells and has a built-in battery-
management system that controls charging and monitors discharge. This
provides a high capacity, low-weight battery system, which can be recharged at
any time. It is not possible for the user to over-charge or over discharge the
battery. For your own convenience it is best to charge it regularly to keep it
topped up, but leaving it in a discharged state will do no harm.
On the front of the battery module are two buttons and a 10-segment LED
display. To find the amount of charge in your battery module, whether
connected to your BITE 3 or separate, press the Battery Condition button.
Figure-4: BITE 3 Battery Charger Condition
The Battery State Indicator will light between 1 and 10 segments signifying between
10% and 100% charge respectively. After a few seconds this display will
automatically go out.
NOTE: The batteries are nickel-metal-hydride and if these are changed the
disposal of cells should be in accordance with local regulations.
Battery Charging
Please note - The battery should only be charged within the temperature range
32°F – 115°F (0°C to 45°C). Fast charging will not be allowed if the temperature
is below 10°C. Fast charging causes the temperature of the battery to rise. If the
temperature exceeds 115°F (45°C) the charging rate will be reduced
automatically.
To charge the battery, your battery module must be removed from the
instrument. Remove the module by pressing on the raised circular area of the
retaining clips and pull the top of the clip away from the instrument body. The
module now unplugs from the base of the instrument. Plug in the charger (J4) or
connect the optional 12 volt vehicle-type battery using the ‘cigarette lighter’ lead.
The LED "Battery State" indicator will light and show movement when the
battery is charging. The battery may be recharged before it has been fully
J6
J5

M
AVTMBITE 3 Rev 8 April 2014
14
discharged. It will normally be recharged to 90% of capacity within 2 ½ hours.
Full charge may take up to 4 hours before indicating that the battery is full
depending on the initial state of the battery. When charging is complete the
battery management circuitry will switch off so that over-charging is prevented.
Your battery module can be safely used in a partially charged state and will not
suffer if stored in a discharged state. However, you may wish to have a spare
battery that can be interchanged with the one in use to provide continuous use of
your BITE 3.
As the battery ages, it may start to loose its capacity. In this case the battery
module has a slow charge facility which is activated by pressing the Slow Charge
() button (J6) while switching on the charger supply until the indicator bars
start to move. This method of charging can take up to 48 hours and so is best
reserved for a weekend or a period when the instrument is not required to be
used. A fully charged battery, even if not used, will self discharge over a period of
several weeks (faster at higher temperatures). Always check the "Battery State"
indicator before starting work. A fully charged battery will light all segments. A
fully discharged battery will light no segments.
NOTE: All batteries suffer a reduced life if exposed to constant high
temperatures. A constant temperature of 30°C will probably cause the
battery to fail in less than 5 years. 40°C will shorten its life to 2 years.
THE BATTERY STATE INDICATOR
The Battery State Indicator provides information on the amount of charge in the
battery, but is also used to signal other conditions as follows:
Standard Charging (Fast):
The battery module is charging at its standard rate. The LED is progressing
across at a fast pace
Slow Charging (Slow):
The battery module is charging at its slow rate. The LED is progressing at a slow
pace
Standard charging but at a slow rate (Flashing and Slow):
The battery has been set to charge at its standard rate but, because the battery
has become hot, it has switched charge rates to a lower rate while the battery
cools down. Wait for the temperature to drop and/or move to a cooler location.
The stationary LEDs are flashing while one LED progresses at a slow pace.
Not charging. There is a temperature problem.