BITE®3
Battery Impedance Test Equipment
■
Determines health of lead-acid cells up
to 2000 Ah
■
On-line testing with Pass/Warning/Fail
calculations
■
Measures impedance, interconnection
resistance and cell voltage
■
Windows CE operating system with
32 MB of memory
■
Measures float and ripple currents
■
Includes ProActiv™Database Management
Software
BITE
®
3
Battery Impedance Test Equipment
DESCRIPTION
The Megger BITE 3 Battery Impedance Test Equipment
determines the health of lead-acid cells up to 2000 Ah by
taking measurements of the most important battery
parameters. The BITE 3 measures cell impedance, an
internal ohmic test, cell voltage, intercell connection
resistance and ripple current. And, for the first time in a
battery instrument, the BITE 3 measures float current and
the harmonic content of the ripple current. There is even a
built-in spectrum analyzer to show the harmonic content
of the ripple current. It has firmware that can be upgraded
through the Internet and supports multiple languages.
The BITE 3 is one of the easiest instruments to use. Its
measurements, along with temperature, specific gravity and
other battery data, can provide the best basis for
evaluating the overall health of batteries from terminal
plate to terminal plate and to a lesser extent, the charger
(from ripple current and its harmonic content.) Megger
recommends that the BITE 3 be made part of a
comprehensive battery maintenance program with readings
taken and recorded semi-annually for flooded, lead-acid
cells and quarterly for VRLA.
Unlike load-cycle testing which is expensive, nonpredictive and time-consuming (but does provide actual
capacity data), the BITE 3 is quick, reliable and easy to
use. With a rapid test time, one person can easily, quickly
and precisely measure cell and string parameters without
taking the system off line. Furthermore, in as little as four
keystrokes, the instrument is ready to take battery
measurements (five, if the power button is included). The
processor of the BITE 3 uses a Windows
®
CE Operating
System and can store more than 1 million cells’ data in any
string configuration. It is menu-driven that is easy to
navigate. Its unique data analysis screens provide
immediate feedback on the status of cell impedance, (see
Figure 1, Battery Analysis Report). The first part of the
report is the numerical data. The second part is the
impedance deviation graph and the third part is the
impedance deviation graph but in ascending impedance
order. The ascending impedance graph groups the weakest
cells together for easier analysis. With the optional printer,
this report can be printed by the user and left at the site as
a record for future reference.
PROACTIV DATABASE MANAGEMENT SOFTWARE
The first of its kind, ProActiv is a powerful software
package that organizes and analyzes battery data in an MS
Access database. Used in conjunction with the BITE 3,
ProActiv manages the transferred test data from the BITE 3
by organizing it according to your needs and displaying it
in an extremely useful manner. Once the database is
configured to your liking and test data are transferred from
the BITE 3, it provides red, yellow and green bands that
coincide with user entered pass, warning and failure limits.
ProActiv allows the user to organize and manage battery
data such as voltages, impedance, intercell connection
resistance, ripple current, and specific gravity. ProActiv
even has a place for IR thermographs, diagrams and
graphics to store with the battery data. It is an allencompassing battery database management tool.
Having such a tool becomes even more important when
you consider the following: battery testing is crucial to
ensure a battery system provides standby and emergency
power to operate devices such as emergency lighting, UPS
Figure 1: Battery Analysis Report
BITE®3
Battery Impedance Test Equipment
systems, operating controls, switchgear components,
protective relays and continuous process systems. Failure
of a battery system within environments such as utilities,
hospitals and manufacturing plants can result in
operational failure of the devices connected to it. ProActiv
assists the user to avoid battery failures, budget for future
battery string and cell replacements, and plan battery
changeouts in an orderly manner.
The BITE 3 along with ProActiv software offer the most
comprehensive data analysis system to provide confident
and reliable evaluation of batteries in the dc network.
Together, they combine to make the most powerful battery
health analyzer available on the market today.
APPLICATIONS
It is known that impedance is correlated to battery
capacity and there has been a long-standing question as to
when a user should replace a cell. See Figure 2. Recent
studies by EPRI* and other organizations indicate that
when the impedance of a sealed battery increases by
about 50% from its baseline value, the cell has degraded to
less than about 70% capacity. BITE 3 and ProActiv allow
the user to trend data and to enter baseline values for
comparison purposes and to make decisions whether onsite or in the office. Both the BITE 3’s impedance
deviation graph and the trend graph in ProActiv clearly
show the status of a cell which helps users to decide what
action needs to be taken to ensure battery back up
reliability based on users’ criteria.
A battery’s internal impedance increases as its capacity
decreases due to various factors such as age, ambient
temperature, discharge history, etc. The BITE 3 measures
internal impedance and dc voltage for lead-acid cells up to
2000 Ah in capacity. It also measures intercell connection
resistance, float current and ripple current and the
harmonic content of the ripple current to provide a much
better evaluation than any other single instrument.
Impedance finds electrical path problems due to plate
sulphation, post-seal corrosion, dry-out (loss of
compression), poor intracell welds and intercell
connections and more. These data let the user determine
maintenance needs such as:
■
Cell replacement criteria based on impedance trends
■
Jumper out a cell or two
■
Clean and/or retighten intercell connectors
■
Shorten the maintenance interval, etc.,
■
Evaluate float current and ripple current effects
Typical installations that can be tested using the BITE 3
include:
■
Electrical power generation plants
■
Substations — utility, railroad, industrial
■
Telecommunications facilities — OSP, Wireless, POPs,
MTSOs, Fiber Regens
■
UPS systems — standard and cabinetized batteries
■
Railroad — Signals and Communications, CTC
■
Aircraft power supplies
■
Marine and military
*Stationary Battery Monitoring by Internal Ohmic Measurements
EPRI, Palo Alto, CA: 2002. 1002925
drop of the intercell connector to calculate the resistance
of the intercell connector. Then, it measures the strap
again without the instrument current. A mathematical
calculation is performed to determine float and ripple
currents and the intercell connection resistance.
The optional CT can be used with short strings in parallel
configurations to measure “escape current.” Other
techniques do not measure the current and can overstate
the health of batteries in these types of configurations. By
using a CT to measure the actual current in the cell being
tested, better results are obtained.
ProActiv can download string header info (with baselines
and limits) into the BITE 3 along with the most recent data
(even if measured by a different BITE). See Figure 3. Then
using the menus, simply scroll to the site and string and
start taking readings. When finished, close the test and
continue to the next string. At the conclusion of the test,
simply download to a PC for further data analysis and
long-term trending. Its versatility allows comments to be
added about the string. These comments will be uploaded
with the battery data. Additional comments about the site,
string and/or cell such as ambient and pilot cell
temperature can be stored by using the keypad to enter
them.
DATA ANALYSIS
The interface between BITE 3 and ProActiv is an
advanced, state-of-the-art feature that ensures that
everyone has access to the latest information and data on
which to base intelligent battery decisions. Not only can
emergency cell replacement criteria be developed but also
budgetary planning for string replacements can now
become part of the fiscal planning process.
ProActiv has the ability to download site and string
information and data as well as firmware updates to the
BITE 3. The data downloaded into the BITE 3 gives access
to the most recent data for the strings being tested during
the upcoming week or month.
BITE®3
Battery Impedance Test Equipment
FEATURES AND BENEFITS
■
Calculates impedance automatically
and stores results for on-site review to
make immediate decisions.
■
Serial connector for uploading stored
data to a personal computer and to
download data from ProActiv.
■
Measures lead-acid cells up to 2000 Ah
to test a wide range of batteries.
■
On-line testing requiring no downtime
and introduces less risk to battery
testing compared to load testing and
other techniques.
■
Stores more than 1 million cells’ data
in any string configuration – no need
to stop, download, delete and continue.
■
Firmware and software updates are fast and easy for
ProActiv and the BITE 3 through the Internet.
■
No programming skills required. ProActiv is an easy to
use, fully functional battery database capable of storing
as much information and data as your hard drive (or
network) has memory to store.
■
ProActiv has the ability to import images such as IR
thermographs, diagrams or photographs. This helps to
document visual inspections, string configurations,
installation techniques, or other aspects of battery
systems. Images and data are stored together, providing
convenient and easy access.
■
The BITE 3 and ProActiv accommodate multiple
languages.
TEST PROCEDURE
The BITE 3 works by placing the lead set at the cell
terminals to measure the voltage drop of the ac current
signal applied by the instrument to the cell while it is
on-line. During each measurement, impedance is
calculated following Ohm’s Law, displayed on the LCD,
and stored. It also measures, displays and records dc
voltage, interconnection (strap) resistance, float and ripple
currents. Float and ripple current measurements are
performed separately at the start of the test. This is
because current is the same everywhere in the series
connection of the string in accordance with Kirchhoff’s
law. All of these data together help determine the overall
health of the entire battery string’s electrical path from
terminal plate to terminal plate and to a lesser extent, the
charger (by measuring ripple current and its harmonic
content).
An innovative, patent-pending measuring technique is
being employed so that a clamp-on current sensor is no
longer necessary. It is well-recognized that the best way to
measure current is with a shunt. Since the battery has
many straps, simply by determining a strap’s resistance, it
can be used as a shunt to determine float and ripple
currents. First, while across an intercell connector, the
instrument applies a current and measures the voltage
Figure 2: Ascending impedance compared to load test
BITE®3
Battery Impedance Test Equipment
With previous data loaded, better
analysis can be performed simply by
comparing the last result to the most
recent result. Any cell that changes
by more than a few percent suggests
that further investigation is
warranted.
On-Site Interpretation
Impedance readings for individual
cells can be used to compare to the
string average. Individual cells with
deviations of more than ±15% for
flooded and ±35% for VRLA typically
indicate a problem with that cell.
The Battery Analysis Report clearly
shows the cells that are weakest
when compared to the string average
and the other cells in the string. It is
typically the one or two weak cells
that can take the string off line. By
comparing each cell to the string average, it is possible to
determine which cell is the weakest in the string and by
how much.
If previous data were downloaded through ProActiv, then
a comparison of each cell to its previous reading (%C) can
provide additional information about each cell. The
Battery Analysis Report is designed to provide as much
information as possible on which to make decisions while
on site; decisions to ensure that the string will properly
support the load.
Trending Analysis
Impedance readings can be used for trending to determine
replacement criteria. Battery cell impedance values should
be recorded and compared to previous readings to
determine the position of the cell on the curve of
impedance versus cell life. Based on experience, a
variation of ±20% from baseline of a flooded lead-acid and
±50% for VRLA cells indicate significant change in the
electrical path to warrant serious evaluation of the health
of the battery system. Megger maintains a database of
impedance values by some manufacturers and battery
size/type. The BITE 3 with baseline values entered can be
used as a trending tool while on site. Trending is the best
method available to know the most about the health of
batteries.
Configuring the ProActiv Database
There are three basic steps to setting up ProActiv:
■
Configuring battery manufacturers, models, sites, and
strings including baselines and limits
■
Entering data from previous BITE downloads, manually
or directly from the BITE 3
■
Performing data analysis
ProActiv is configured by entering and setting up each
battery manufacturer and battery model type used in a dc
network. Optionally, other information such as sales
contact names, purchase order numbers or technical
support contact names may be added. Extensive model
information may be entered including model type,
plate count, rating, charger type, baseline impedance
value as well as warning and fail percentages. Limits
on other parameters can also be set such as upper and
lower float voltage limits and specific gravity limits.
All of the individual battery cell information can then
be configured under a specific site name, string ID,
battery model, installation date, and charger
information. If a cell needs to be replaced, but the
same model is not available, ProActiv will allow it to
be replaced with another manufacturer or model.
ProActiv keeps track of cell-level information and data
and this is reflected when viewing information and
data for that string. In instances where there is such a
large installed battery base and a string is replaced,
some of the better cells may be used in other strings to
replace weak cells. ProActiv allows the user to keep
track of these movements.
Entering Data
Data entry is easy with the Data Entry Wizard: direct
import of test data from a BITE, manual entry, via
browsing for a file. When uploading from a BITE 3,
ProActiv can automatically create a site and string for a
new site that hasn’t been prevoulsy configured in
ProActiv. Digital photographs and IR thermographs can
be imported also into ProActiv to document the health
and condition of the battery.
Performing Data Analysis
The last step is “analyze.” Using both numerical data
displays and graphs, the user can see how the batteries
in the dc network are performing based on the userentered limits for each parameter. Graphs can be
printed and saved as bitmaps to export to other
programs for written reports. A summary report may be
printed which lists all cells' data and each cell's status.
The graph shown in Figure 4 clearly shows which cells
are in the pass (green), warning (yellow) and fail (red)
bands. It is possible to select and graph one cell and
verify its entire history.
Figure 3: ProActiv to BITE 3 download screen
BITE®3
Battery Impedance Test Equipment
ACCESSORIES
The BITE 3 has many accessories that enhance its
versatility. There are several lead sets, a printer,
lighted probe extensions and a CT.
The lead set family contains:
■
AMP/Burndy lead set for small telco batteries
■
Quick Disconnect lead set for ELU systems, security
systems, etc.
■
Kelvin Clip lead set for other types of batteries
The CT is for measuring escape current in short
strings in parallel configurations. The lighted probe
extensions are ideal for measuring batteries in (dark)
cabinets. The extensions eliminate the need to take
the battery off line and can be tested during normal
working hours, saving time and money. As with
previous BITEs, it is a one person job since the
batteries need not be removed from the cabinet.
SPECIFICATIONS
BITE 3 Instrument
Impedance Range and Resolution
0.05 to 1.000 mΩ 1 µΩ resolution
1 to 10.00 mΩ 10 µΩ resolution
10 to 100.0 mΩ 0.1 mΩ resolution
Voltage Range and Resolution
1 to 30 V dc across probes
1 to 8.0 V dc 1 mV resolution
8.0 to 30.00 V dc 10 mV resolution
Current Range and Resolution
0.5 — 9.99 A ac/dc 0.01 A resolution
10.0 — 99.9 A ac/dc 0.1 A resolution
Accuracy
dc voltage: ±(1% rdg +1 lsd)
ac impedance: ±(5% of rdg +1 lsd)
ac/dc current: ±(5% rdg +0.5 A)
Precision
Better than 0.5% one sigma
Source Output Current
1/2 A rms
Display
1/4 VGA LCD
Settling Time per Reading
3 seconds maximum
Battery Pack
2 to 4 hours continuous
4.8 V dc, 7000 mAh, quick charge NiMH battery pack
Temperature
Operating: 32° to 105° F (0° to +40° C)
Storage: -5° to 130° F (-20° to +55° C)
Humidity: 20 to 90% RH, noncondensing
Safety
Designed to meet IEC 61010-1 specifications
Dimensions
8.6 x 4 x 9.5 in.
220 x 100 x 237 mm
Weight
5.7 lbs (2.6 kg)
Charger
Supply Voltage
100 to 130 V, 50/60 Hz, 14 VA
210 to 250 V, 50/60 Hz, 14 VA
Output
6.50 V dc at 1.10 A dc charging (max.)
Optional Printer
Thermal, with 4-1/4 in. (110 mm) printing width
Figure 4: ProActiv ascending impedance graph with Pass/Warning/Fail bands
BITE 3, 110/230 V ac, 50/60 Hz, CE-marked BITE 3
Included Accessories
ProActiv™ software BI-90001
Canvas carrying case 35788
RS-232 null modem cable 33533-1
Line charger EV6280-333
Battery EV6121-492
Dual-point lead set BI-10002
Tip kit BI-10017
Operating manual AVTMBITE3
ORDERING INFORMATION
ISO STATEMENT
Registered to ISO 9001:1994 Reg no. Q 09250
Registered to ISO 14001 Reg no. EMS 61597
BITE3_DS_en_V12
www.megger.com
Megger is a registered trademark
BITE®3
Battery Impedance Test Equipment
ProActiv System Requirements
Processor
300 MHz Pentium II or better
Operating System
Windows 98
Windows Me
Windows NT 4.0 (SP6a required)
Windows 2000 (SP2 recommended)
Windows XP
Note:Windows 95 is not supported
Software
Microsoft®Internet Explorer 5 or later
Microsoft .Net Framework
Will be automatically installed by ProActiv if it is not already
installed on your computer. For additional information about
Microsoft .Net Framework please visit: www.microsoft.com/net
Hard Drive Space
100 MB
System Memory (RAM)
64 MB (128 MB recommended)
Other Drives
CD-ROM (used only for installation)
Communications Port
COM (used only for importing data from test equipment or to
download information to the BITE 3)
Monitor/Display
True color, 800 x 600 resolution
Additional Information
For improved usage, an internet connection will make it easy to
get automatic ProActiv software updates.
The user should have Microsoft Excel 9.0, or later, to import
AVOLink or COMLink files into ProActiv.
Optional Accessories
Printer, battery-operated, 110 V ac 35755-3
Printer, battery-operated, 220 V ac 35755-4
Printer paper, 1 roll 26999
AMP/Burndy lead set BI-10004
Kelvin clip lead set BI-10005
Quick Disconnect lead set BI-10006
Cigarette lighter charger EV6280-332
Current transformer kit 35873
USB-serial adapter 35871
Probe extensions, lighted 35865
Hard-sided carrying case 35890
Standard transit case 35915
Field test shunt, 0.01 Ω, current rating 10 A 249003
Field test shunt, 0.001 Ω, current rating 100 A 249004
Field test shunt, 0.0001 Ω, current rating 500 A 249005
Item Cat. No.Item Cat. No.
Item Cat. No.Item Cat. No.
UK
Archcliffe Road, Dover
CT17 9EN England
T (0) 1 304 502101
F (0) 1 304 207342
UNITED STATES
4271 Bronze Way
Dallas, TX 75237-1019 USA
T 1 800 723 2861
T 1 214 333 3201
F 1 214 331 7399
OTHER TECHNICAL SALES OFFICES
Norristown USA, Toronto CANADA,
Mumbai INDIA,
Le Raincy FRANCE, Cherrybrook
AUSTRALIA, Guadalajara SPAIN
and The Kingdom of BAHRAIN.
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