Extech Instruments BT100 User manual

User Manual

Battery Capacity Tester

Model BT100



AdditionalUserManualTranslationsavailableatwww.extech.com

BT100-en-GB_V4.0 11/16

Introduction

Thank you for selecting the Extech Model BT100. The Battery Tester is designed for measuring the

internal resistance and output voltage of batteries including lead storage cells, nickel-cadmium

batteries, lithium-ion batteries, and nickel-metal hydride batteries.

This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable

service. Please visit the Extech Instruments website (www.extech.com) to check for the latest version

of this User Guide.

Features

Accurate results are achieved using a four-terminal measurement method that eliminates lead

and contact resistance.

1kHz test current with up to 10µresistance resolution.

Dual display simultaneously indicates the internal resistance and the battery voltage.

Comparator function with storage of up to 99 sets of resistance and voltage data for battery

deterioration characterization.

Pin type and alligator type 4-terminal Kelvin leads for quick and accurate resistance

measurements.

Memory capacity to store up to 999 (manual datalogging) or 9600 (automatic datalogging) data

points.

Supplied RS232 PC port and Windows compatible software.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must refer to the

manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages

may be present

Double insulation

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Meter Description

1. Power button: Power ON/OFF

2. R READ button:

Press R button to start manually logging

readings.

Press R READ button again to stop logging.

3. M MEMORY button:

Under the manual logging mode, the tester

stores a single set of logged readings to the

memory by pressing

M MEMORY button.

Press and hold M MEMORY button for 2

seconds to enter continuous (automatic) logging

mode. Press again to stop logging.

4. V-RANGE button: Select the voltage range. (4V,

40V)

5. HOLD button:

Press HOLD to freeze or unfreeze the displayed

reading.

Press and hold the HOLD button for 2 seconds

then release, to enter the interval time (sample

rate) setting for continuous data logging. Set from

1 to 255 seconds. Press Set button to save and

exit.

6. Ω- RANGE button: Select the resistance range. (40m, 400m, 4, 40)

7. REL button:

Press to move the cursor to the right.

Press REL (Relative) to zero the reading.

8. button: Press to increase the displayed value.

9. SET button:

Press SET to switch the comparator mode on or off.

Press and hold the SET button for 2 seconds to enter the comparator-setting mode. Press

again to store the setting in memory.

10. button: Press to decrease the displayed value.

11. Button:

Press to move the cursor to the left.

Press to switch the audible tone on or off.

12. RS-232 connector: PC interface connector.

13. – Input jack: Black test lead plug connection.

14. + Input jack: Red test lead plug connection.

15. LCD display (LED test status indicators are located below the LCD display)

16. AC adaptor input

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Display Description

1. Measured resistance reading (or High/Low resistance limit when setting up the comparator)

2. Measured voltage reading (or High/Low voltage limit when setting up the comparator)

3. The comparator set number (there are 99 sets total)

4. The memory location for manually logged data.

Symbols:

m: Milliohm (resistance)

V: Voltage

HOLD : Hold function (display freeze)

COMP : Comparator function enabled

: Low-Battery

:Beeper enabled

DATA R : Manual datalogging enabled

M : Continuous datalogging enabled (flashes each time data is stored)

INTV: Interval time setting for the continuous datalogging function. (1 to 255 seconds)

COMP.SET : Comparator settings mode

HIGH: High limit setting (threshold) for the comparator

LOW: Low limit setting (threshold) for the comparator

LED Test Status Indicators

PASS (green LED): Battery is good (within the tolerances of the comparator’s preset limits)

WARNING (yellow LED): Battery is beginning to deteriorate

FAIL (red LED): Battery has failed

The LED status indications listed above are active when the High/Low comparator limits for internal

resistance and the comparator threshold value for voltage are properly configured.

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Operation

Preparation and Safety

The following safety information must be observed to ensure maximum personal safety during the

operation of this tester.

To avoid electric shock when replacing the batteries: Disconnect the test leads from the device

under test before attempting to replace the batteries.

Check the battery polarity carefully when inserting the batteries. Refer to the battery

replacement section (under Maintenance) later in this User Guide.

Be sure to dispose of used batteries properly.

WARNING

Do not attempt to measure DC voltage exceeding 50V.

Do not attempt to measure AC voltages; this could result in personal injury or

damage to the unit.

To avoid personal injury and/or damage to the unit, do not attempt to measure

the voltage of a generator. This will result in an AC voltage being applied to

the voltage generating output terminals.

After measuring a high voltage battery, and before continuing to measure a

low voltage battery, short the measurement leads by touching the lead tips

together. This will discharge the DC-elimination capacitor (connected across

the leads); otherwise a dangerous condition can exist where an excessive

voltage may be applied to the low voltage battery.

Test Leads

Two sets of test leads are supplied with the meter. Both sets provide four (4) terminal Kelvin

connections which eliminate lead resistance and probe contact resistance. The application will dictate

whether the alligator type or the press-probe type should be used.

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Testing Procedure

Connect the red test lead to the “+” jack and the black test lead to the “-” jack.

1. Press the Power button to switch the tester ON.

2. Use the V-RANGE or -RANGE buttons to select the desired Voltage or Resistance range.

3. Perform a REL Zero adjustment (see next section) each time the range is changed.

4. Connect the red test probe to the positive battery terminal, and the black test probe to the

negative battery terminal.

5. Read the battery’s internal resistance and the DC voltage directly on the meter’s display.

Note: When the measured DC voltage or battery internal resistance value is over range, “OL” is

displayed. When the AC test current faults “- - - -” will be displayed.

REL Adjust (ZERO)

The REL function zeros the selected range. The reading displayed when the REL button is pressed

will be taken as zero and will be used to ‘offset’ subsequent measurements.

1. Short the four (4) probe tips of the red and black test leads as shown in the accompanying

diagrams.

2. Press the REL button and the display will show the ‘R’ icon and the resistance and voltage

values will zero.

3. Connect the test leads to the battery to be tested.

4. The REL zero adjust must be performed each time the range of the meter is changed, the test

leads are swapped, or after switching between resistance and voltage tests.

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Comparator (99 sets)

The comparator function compares the measured values with preset High and Low limit values for

internal resistance and threshold voltage level, and determines the range that the measurement

should fall into. Then, according to the following conditions, switches ON the corresponding LED,

and sounds an audible alert as shown in the table below for the WARNING and FAIL conditions.

Comparator Settings

1. Press and hold the SET button for 3seconds then release, the display will show COMP.SET

indicating the comparator mode is enabled.

2. Use the or button to change the comparator number from 01 up to 99.

3. Use the V-RANGE or Ω-RANGE buttons to set the desired voltage and resistance measurement

range.

4. Press once, the LOW icon and the left two digits of the low limit resistance will be flashing.

(Use the & buttons to select the desired value.)

5. Press once, the right two digits of the low limit resistance will be flashing. (Use the

and buttons to select the desired value.)

6. Press once, the HIGH icon and the left two digits of the high limit resistance will be flashing.

(Use the and buttons to select the desired value.)

7. Press once, the right two digits of the high limit resistance will be flashing. (Use

the and buttons to select the desired value.)

8. Press once, the left two digits of the threshold voltage will be flashing. (Use the 

and buttons to select the desired value.)

9. Pressonce, the right two digits of the threshold voltage will be flashing. (Use the 

and buttons to select the desired value.)

10. Repeat step 2 to step 9 to set the next comparator number.

11. Press SET again to exit the comparator setting mode.

Comparator Table

Resistance

Voltage

Low limit resistance High limit resistance

Lo Middle Hi

Voltage Lo

Comparison

Value Hi

WARNING

Beeper

WARNING

Beeper

FAIL

Beeper

Pass WARNING

Beeper

FAIL

Beeper

Comparator Start / Stop Controls

1. Press SET to activate the comparator function, the COMP indication will appear on the display.

The comparator will operate once measurements are taken.

2. Use the and buttons to select the desired comparator number. The selected comparator

number remains in memory even when the power is switched off.

3. Press to set the audible alert ON, the indication will appear on the display, and the

audible tone will sound with a WARNING or FAIL result. Press again to disable the audible

alert.

4. Press SET again to switch off the comparator function.

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Datalogging

Manual Data Logging (999 sets)

1. Log readings one at a time to the internal memory by pressing the MMEMORY button.

“DATA M NO XXX” will appear on the LCD for one second to indicate the memory location.

2. Press RREAD button to review logged readings. The display will show “DATA R NO XXX”.

3. Use the and buttons to scroll the logged readings.

4. Press RREAD again to discontinue viewing the logged readings.

Continuous Data Logging

1. Press HOLD for 2 seconds, then release, and the display will show the INTV icon.

2. Use the or button to select the desired interval time (datalogging sample rate) from 1

second to 255 seconds.

3. Press SET to save and exit the interval time setting mode.

4. Press and hold MMEMORY for 2 seconds to enter the continuous (automatic) logging mode, the

display will show the Micon.

5. The Mwill flash each time a reading is stored.

6. Press MMEMORY again to exit the continuous datalogging mode.

7. Data stored using the continuous datalogging mode cannot be read directly on the tester’s

display, it must be downloaded to a PC using the supplied software.

Clearing the Datalogger Memory

When the internal memory is full, the Full icon will appear on the display and datalogging will stop.

1. Press to switch OFF the tester.

2. Press and hold the MEMORY button, and while continuing to hold the MEMORY button, press

the button. The display will show the CLr icon and all datalogged readings will be cleared from

memory.

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Specifications

Resistance measurement method Four (4) terminal Kelvin connections

A/D conversion Dual slope

Displays Dual LCD for measurements and programming icons

Three (3) test status LEDs

Datalogger Sampling rate 1 to 255 seconds (interval time between logged readings)

Open-circuit terminal voltage 3.5Vpp max

Measurement frequency 1KHz

10%

Input over range “OL” display

Low battery indication display

Test current fault detect “- - - -” display

Auto power off After approximately 30 minutes

Zero (Relative) function Circuit offset voltage is displayed as 0V

Hold function Display freezes

Audible Alarm function Audible alert for Warning and Failure conditions (can be set

ON or OFF)

Comparator settings Resistance High/Low limits and Voltage threshold point

Number of comparator configurations 99 sets

Comparator output Test status LEDs for Pass (green), Warning (yellow), and Fail

(red) results (audible tone for Warning and Fail conditions)

Resistance

Voltage Lo IN Hi

Lo Warning Warning Fail

Hi PASS Warning Fail

Manual Datalogging memory 999 sets can be stored in meter’s internal memory

Continuous (automatic) Datalogging 9600 sets can be stored in meter’s internal memory

Operating conditions 0

to 40

°C

(32 to 104°F)

80%RH (non-condensing)

Storage conditions -10

to 50

°C

(14 to 122°F)

80%RH (non-condensing)

Power source Six (6) ‘AA’ 1.5V batteries; Optional 9V AC adaptor

Maximum power consumption 1.0VA

Maximum continuous operation 7 hours approx.

Altitude 2000m max.

Dimensions 250 x 100 x 45mm (9.8 x 3.9 x 1.7”)

Weight 500g (1.1 lbs.) approx. (including batteries)

Accessories Test Leads and batteries

Optional equipment AC adaptor (9V output)

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Electrical Specifications

To ensure accuracy the ambient temperature should be 23

°C

with a humidity of 80% RH

(maximum) non-condensing. In addition, perform a Zero adjustment after each range change.

Resistance measurements

Temperature coefficient: (

0.1% rdg

0.5digits)/

°C

Measurement frequency: 1KHz

10%

Measurement burden voltage: 1.5mVAC

Range Resolution Measurement current Accuracy

40m10µ37.5mA approx.

(1% reading

10digits)

400m100µ3.75mA approx.

41m375µA approx.

4010m37.5µA approx.

Voltage Measurements

Temperature coefficient: (

0.1%rdg

0.5digits)/

°C

Range Resolution Accuracy

4V 1mV

(0.1% reading

6digits)

40V 10mV

Maximum Input Voltage: 50VDC maximum

No AC voltage input permitted

Maximum voltage allowed between input terminals and ground: 60VDC/AC

DANGER

Do not exceed the maximum permissible input voltage (60VDC/AC) to the measurement terminals.

This could result in personal injury and/or damage to the unit.

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