LAMAR BETA D-50 User manual

OPERATING MANUAL
BETA D-50
BATTERY TESTER / ANALYZER
Lamar Technologies, 14900 40th Ave NE, Marysville WA 98271
Tel: [phone] • Fax: [phone]
www.lamartech.com/powerproducts

TABLE OF CONTENTS
1. SYSTEM OVERVIEW ......................................................................... .1
2. INSTALLATION ..................................................................................... .4
3. QUICK OPERATING GUIDE .........................................................
…..6
4. DETAILED OPERATING INSTRUCTIONS ... ................................ … .9
5. CALIBRATION AND MAINTENANCE ... .......................................... ..18
6. TROUBLE-SHOOTING ................................................................. …27
7. SPECIFICATIONS ............................................................................ ..29
APPENDIX A - BATTERY OVERVIEW .............................................. ....30
WARRANTY ............................................................................................ .. ..32
CERTIFICATION OF CALIBRATION .…………………………………. ...33
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V 2.2

1. SYSTEM OVERVIEW
1. SYSTEM OVERVIEW
1.1 SYSTEM OVERVIEW
The Beta D-50 Tester/Analyzer is a self contained unit for discharge capacity testing of
rechargeable batteries. It has been designed to accurately test and guarantee the
emergency capacity of sealed or vented lead-acid or nickel-cadmium batteries.
Guaranteed emergency capacity is especially important for aircraft batteries.
The Beta D-50 enables testing of a battery's capacity by loading it with a constant
current of max 50 amperes (usually set to 80-100% of the battery's capacity rating)
during a fixed period of time (usually 60 minutes). The D-50 analyzes the discharge
characteristics and passes or fails the battery depending on the battery’s ability to
maintain a specified minimum voltage (cutoff voltage) for the duration of the test. The
unit has pass/fail indicators as well as displays for discharge current, cutoff voltage,
battery voltage, and test time.
The flexibility of test parameters of the Beta D-50 makes it usable for a wide variety of
batteries and voltages. The unit accurately tests lead-acid batteries of 12 or 24 volts, as
well as nickel-cadmium batteries up to 24 volts.
The use of solid state circuits in the Beta D-50 has kept its weight to a mere 30 lbs. (14
kg). Consequently the unit is easy to move around to accommodate flexibility in the work
environment.
1.2 DISPLAYS AND CONTROLS
The Beta D-50 has been designed to have very simple and easy to understand controls
and displays (see figure 1-1 and 1-2).
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 1

1. SYSTEM OVERVIEW
ACCEPT LAMP
INDICATOR
Illuminates at end of
test when timer has
completed its preset
time
FAIL LAMP
INDICATOR
Illuminates when
voltage has
dropped to cutoff
before the timer
times out
CUTOFF
VOLTAGE
ADJUST
TRIMPOT
Adjusts cutoff
voltage
CUTOFF VOLTAGE
VIEW BUTTON
Pressed before or
during test to display
and adjust cutoff
voltage
DIGITAL
VOLTMETER
Displays 1) battery
voltage during
discharge; or 2)
cutoff voltage
START BUTTON
DIGITAL
DISCHARGE TIMER
Displays elapsed
discharge time. Can be
set with push buttons
DIGITAL
AMMETER
Displays
discharge
current.
AMPERE
ADJUST KNOB
Sets discharge
current
AC ON-OFF/
RESET SWITCH
Turns unit on or
off and resets all
indicators and
functions
INSTRUCTION
PANEL
CALIBRATION Pressed to start test
TEST PORTS
Provides output for %$77(5<
voltmeter and ',6&+$5* (
ammeter calibration &$%/(
Figure 1-1. Front view of Beta D-50
Page 2 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

1. SYSTEM OVERVIEW
DISCHARGE
RESISTORS
AC VOLTAGE
SELECT DIAL
COOLING Selects mains input
FANS voltage (115 or 230
volts)
AC LINE FUSE
protects line and
equipment
AC MAINS
CABLE
Figure 1-2. Rear view of Beta D-50
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 3

2. INSTALLATION
2. INSTALLATION
2.1 LINE VOLTAGE
The Beta D-50 can operate on either 115 or 230 Volts AC. The desired line voltage can
be selected on the rear of the unit.
CAUTION: Ensure that the unit is set for the appropriate line voltage before operation.
A. On the back of the unit locate the AC voltage select dial.
B. Set dial for appropriately marked AC voltage (115 or 230 volts) using ascrewdriver.
C. For 230 VAC operation, the 115 VAC plug must be replaced with one for 230 VAC in
required configuration.
NOTE: If the plug has to be changed make sure to connect the green AC line wire to
ground.
Connect the unit to a wall outlet with at least a 10 ampere capacity. Sharing of the line
with other equipment may result in erratic operation if other equipment draws high pulse
or surge currents.
NOTE: The Beta D-50 will maintain its operational integrity with line fluctuation less than
± 10%.
2.2 TERMINALS
Two important points about the DC battery cable and connector are:
A. If the aircraft battery quick disconnect connector is removed, the
ring terminals can be used to connect to a post terminal battery.
WARNING : Correct polarity must be observed.
B. If the cable is extended or repaired during maintenance, the
sensing leads which run with the heavy DC cable must be
connected to the new terminal (see section 5.5).
Page 4 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

2. INSTALLATION
2.3 SPACE REQUIREMENTS
The Beta D-50 system occupies 15" x 10 ¼" (381 mm x 260 mm) of table top space.
Place the unit on a sturdy workbench in a well-ventilated battery servicing area with the
battery adjacent to it.
The rear of the unit has air flow from hot resistors. Allow at least 6" (150 mm) of
separation from the wall and adjacent equipment in order to maintain proper air flow.
WARNING: Due to the air flow from hot resistors on the
rear of the unit, use extreme caution on placement.
NOTE: In non air-conditioned rooms it is recommended
that circulating or extracting fans be used to aid in the
removal of heated air.
NOTE: Operation in dusty or otherwise dirty air
environments will severely reduce the cooling capacity of the
fans and can lead to premature failure.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 5

3. QUICK OPERATING GUIDE
3. QUICK OPERATING GUIDE
This section gives an overview of how to quickly get started capacity discharge testing a
battery using your Beta D-50. If there is uncertainty at any point on how to proceed, please
refer to the more detailed instructions in the section 4.
WARNING: Always turn the AC power switch off before
connecting or disconnecting a battery
NOTE: Once set, all settings are maintained and need not be
reset for duplicate testing
A. SWITCH OFF MAINS POWER
Turn off the AC on-off/reset power switch.
B. TURN DOWN DISCHARGE CURR ENT
Repeatedly turn the Ampere Adjust knob fully
counter-clockwise to set discharge current to zero.
C. CONNECT BATTERY
Connect the battery DC cable to the battery and ensure the
connector is plugged in completely.
D.
SWITCH ON MAINS POWER
Turn on the AC on-off/reset power switch. An audible alarm
sounds, and the Accept lamp illuminates. Meters read all
6's or 8's.
E. SET TIMER
Set the timer by pushing buttons up or down to the
required discharge time (usually 60 minutes)
Page 6 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

3. QUICK OPERATING GUIDE
F. VIEW AND SET CUTOFF VOLTAGE
a. Press and hold the View Voltage Cutoff button. The set cutoff voltage
is shown on the voltmeter display.
b. Use a 1/16 inch (2 mm) slot blade precision
type screw driver to adjust the cutoff voltage
to the desired level.
G. PUSH START BUTTON
The audible alarm stops. The voltmeter displays the battery
voltage, the ammeter reads 0 and the timer starts. The red
LED on the timer illuminates. “OP” on the timer illuminates
and the red LED flashes.
H. SET DISCHARGE CURRENT
Slowly turn the multi-turn Ampere Adjust knob clockwise to
the desired discharge current. The ammeter displays the
current as it is being adjusted.
I. WAIT FOR THE DISCHARGE TEST TO
AUTOMATICALLY COMPLETE
During the test the battery voltage, discharge current, and
elapsed discharge time are displayed. The voltage will
continuously decrease while the current remains constant. The
test completes when either the set discharge time or the low
cutoff voltage has been reached. An audible alarm sounds and
the displays freeze at their final values.
J. 1. IF TEST PASSED
The green Accept lamp illuminates. This indicates the discharge
has continued through the duration of the set discharge time (the
red LED and “OP” on timer is off.) without the cutoff voltage being
reached. The battery is usually fit for service, after complete
recharge. See below under respective battery type.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 7

2. IF TEST FAILED
The Fail lamp illuminates if the discharge has
been discontinued because the cutoff voltage has been reached before
the completion of the set discharge time. The red LED goes out. The
time is frozen at the elapsed time at which the test failed. The battery is
in need of reconditioning or must be rejected for
aircraft service. Refer to the battery manufacturer's maintenance
manual on how to proceed.
K. SWITCH AC POWER OFF
Switch the AC on-off/reset switch off before removinghebattery.
NOTE: If in emergency it is required to stop the test, switch the unit to
off/reset. When the test is restarted the timer is reset to zero. It may be
necessary to recharge the battery before resuming the test.
Page 8 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

4. DETAILED OPERATING INSTRUCTIONS
4. DETAILED OPERATING INSTRUCTIONS
4.1 DISCHARGE CHARACTERISTICS
The lead-acid and the nickel-cadmium cells are generally assigned nominal open circuit
voltages of 2.10 volts and 1.35 volts respectively. Actual open circuit voltage at 75°F/ 25°C
for a fully charged battery cell depends on state-of-charge and time after charge.
During discharge, the voltage of the cell or battery immediately begins to decrease
because of the effective internal resistance of the cell. This includes the resistance of
the terminal posts, active material, plate lugs and grids, separators, and contact
resistance between the surface of the active material and the electrolyte. The internal
resistance increases during discharge, being greater toward the end of discharge, when
the terminal voltage is lower.
As voltage gradually becomes lower during discharge, the point of near exhaustion is
reached. At this point, the discharge voltage curve begins to drop very sharply to a value
which is of no further practical use. Usually this happens at 18-20 volts for a 24 volt lead-
acid battery and 1 volt per cell for a nickel-cadmium battery (see figure 4-1).
Battery manufacturers specify a cutoff voltage which the battery must exceed during a
discharge test to have acceptable capacity. The cutoff voltage varies with the rate of
discharge (the discharge current/time combination used to draw the same capacity). For
example, the minimum cutoff voltages for a 30 ampere-hour, 24-volt naval aircraft lead-
acid storage battery are generally specified as is shown in table 4-1.
Rate of Discharge Minimum
Discharge Current Cutoff Voltage
5 hours 6 amperes 21.0 volts
2 hours 15 amperes 19.2 volts
1 hour 30 amperes 18.0 volts
Table 4-1. Cutoff voltages at different discharge rates for a
30 ampere-hour, 24 volt lead-acid battery
The specified final minimum cutoff voltage represents the value of voltage at which the
rated ampere-hour capacity of the battery must have been delivered for the specified
discharge rate. Figure 4-1 is a typical discharge curve for a 40 ampere-hour sealed
lead-acid (SLAB) aircraft storage battery discharged at a 1-hour rate of 40 amperes.
From figure 4-1, it is observed that at the end of 1 hour of discharge time, the battery
voltage has reduced only to about 22 volts. Because the minimum required cutoff
voltage is 18 volts at the 1-hour discharge rate, the battery exceeds the minimum
requirements. With increasing hours of use or age, the battery capacity decreases.
Therefore, battery manufacturers usuallyrecommend testing for a capacity equal to
80% of the original ampere-hour rating.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 9

4. DETAILED OPERATING INSTRUCTIONS
28 40 ampere-hours of
26 capacity delivered at
this point
24
22
20
Minimum cutoff voltage (18 volts)
18
16 0 10 20 30 40 50 60 70 80
Discharge time (minutes)
Figure 4-1. Typical discharge curve for 40 ampere-hour
lead-acid aircraft battery
Figure 4-2 illustrates discharge curves for typical SLABs at different discharge rates.
Note that the cell voltage drops much more rapidly at the higher discharge rates, i.e. the
rates at which a greater current is drawn during a shorter period of time.
25.0
12 24.0
20-hour rate
23.0
22.0
21.0 8-hour rate 15-hour rate
12-hour rate
20.0 4-hour rate
2-hour rate
19.0 1-hour rate
18.0 0 2 4 6 8 10 12 14 16 18 20
Discharge time (hours)
Figure 4-2. Typical discharge curves for SLABs at different rates
Page 10 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

4. DETAILED OPERATING INSTRUCTIONS
The discharge of a lead-acid battery beyond the point of which exhaustion of the cell is
approached can be harmful, as the battery may form a sulfate deposit on its plates. This is
particularly true if the battery is not soon recharged.
4.2 DISCHARGE CAPACITY TESTING
The purpose of a discharge test is to determine the long-term capacity of the battery. For
a lead-acid aircraft battery, for example, the capacity test is the amount of current which
can be delivered for one hour or until the voltage decreases to 1.5 volts per cell. This is
considered the emergency capacity of the battery. The result of the test will
determine whether to accept or reject the battery and which steps could be taken to
electrically recondition the battery.
The amount of electrical capacity available from a fully charged nickel-cadmium or leadacid
battery is defined by the capacity rating of the battery and is stated in terms of
ampere hours. Because of internal resistance, the higher the discharge rate (higher
current during a shorter period of time) demanded of a battery, the less usable capacity it
can supply. See figure 4-2.
4.2.1 Constant-Current Discharge Method
The most accurate and repeatable method of measuring capacity is to discharge the
battery at a constant-current rate. This is also the method used by the Beta D-50. The
load resistance in this method is continuously and automatically varied to maintain a
constant discharge current as the battery's voltage decreases. A schematic of the
circuit diagram for the Beta D-50 can be seen in figure 4-3. At the end of discharge, the
calculation of ampere-hour capacity is the product of discharge current and the elapsed
discharge time.
A
AC
line
SOLID
BATTERY V STATE
CONTROL
CIRCUITS
LOAD RESISTOR


Figure 4-3. Circuit diagram for constant current discharge test
NOTE: Always read the battery manufacturer's operating
instructions. Some lead-acid batteries are recommended at
a 20 volt cutoff when tested for an hour at 80% of rated
capacity. Some nickel-cadmium battery requirements are
testing for two hours at half the rated capacity, and a 1 volt
per cell cutoff.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 11

4. DETAILED OPERATING INSTRUCTIONS
4.3 PREPARATION FOR TESTING
Before starting the discharge test, read the component maintenance manual (CMM) or
the operating and maintenance manual (OMM) for the specific battery to be tested.
Ensure that the discharge rate and cutoff voltage from the battery manufacturer are
followed.
It is recommended that a visual inspection of the battery is carried out in conjunction
with testing and charging batteries.
The battery must be fully charged before testing starts, except for special tests.
WARNING: Always turn off the AC power switch before
connecting or disconnecting a battery.
NOTE: The test, unless otherwise specified in the
manufacturer's CMM/OMM, shall be conducted at room
ambient temperature of 70°F to 85°F (21°C to 29°C).
A. SWITCH OFF MAINS POWER
Turn off AC on-off/reset power switch.
B. TURN DOWN DISCHARGE CUR-
RENT
Repeatedly turn the Ampere Adjust knob fully
counter-clockwise to set discharge current to
zero. This prevents excess current, which may be
too high for the battery, once the battery is
connected and the discharge test has begun.
4.4 DISCHARGE TIME
4.4.1 TIMER UNIT SETTING
The Beta D-50 has a built in timer, allowing discharge time settings from 0 minutes
to 999.9 minutes.
Page 12 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

4. DETAILED OPERATING INSTRUCTIONS
4.4.2 DISCHARGE TIME SETTING
The discharge time is usually set to 60 minutes, after which a pass/fail signal is given
based on whether the battery reached the cutoff voltage or not.
To determine the full capacity of the battery a longer time can be set (several hours). The
Beta D-50 will then continue the discharge test only until the cutoff voltage has been
reached. The timer, cutoff voltage and discharge current displays will freeze at this point.
The capacity can be calculated as the product of the discharge current and the time
passed until the voltage cutoff was reached.
C. SET TIMER
Set the timer by pushing buttons up or down to the
required discharge time (usually 60 minutes)
CAUTION. For lead-acid batteries the time and voltage cutoff
should be set with caution. If discharge continues too far
beyond the point of exhaustion it may be harmful to the
battery, unless the battery is soon to be recharged.
4.5 CUTOFF VOLTAGE
The Beta D-50 will automatically stop the discharge test when the cutoff voltage has
been reached. The cutoff voltage is set so that if the battery voltage is higher than the
cutoff voltage when the discharge time has expired, the battery has passed the capacity
test.
4.5.1 LEAD-ACID BATTERIES
Always refer to your battery manufacturer's maintenance manual for the most accurate
information. For a 24 volt sealed lead-acid battery the cutoff voltage is usually set at 18
or 20 volts when discharged one hour at a current equal to the 80% of the battery’s C1-
rate. See table 4-2 for examples of discharge test settings for sealed lead-acid
batteries.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 13

4. DETAILED OPERATING INSTRUCTIONS
1-hour rating Discharge settings
Ampere Time Rate Cutoff
Volts hours (min) (amperes) (volts)
24 10 60 8 18/20
24 15 60 12 18/20
24 20 60 16 18/20
24 30 60 24 18/20
24 40 60 32 18/20
12 10 60 8 9/10
12 15 60 12 9/10
12 20 60 16 9/10
12 30 60 24 9/10
12 40 60 32 9/10
Table 4-2. Discharge test setting for sealed lead-acid batteries
4.5.2 NICKEL-CADMIUM BATTERIES
For nickel-cadmium batteries the cutoff voltage should equate to an average of 1 volt per
cell, when discharge tested at a current of approximately 80% of the C1-rate. For a 24
volt/10 ampere-hour battery with 19 cells, the cutoff voltage would be set to 19 volts when
discharging at 8 amperes (see table 4-3).
1-hour rating Discharge settings
Ampere Time Rate Cutoff
Volts hours (min) (amperes) (volts)
24 10 60 8 19
24 15 60 12 19
24 20 60 16 19
24 30 60 24 19
24 40 60 32 19
12 10 60 8 10
12 15 60 12 10
12 20 60 16 10
12 30 60 24 10
12 40 60 32 10
Table 4-3. Discharge test setting for nickel-cadmium batteries
4.5.3 SETTING CUTOFF VOLTAGE ON THE BETA D-50
Before setting the cutoff voltage, a battery has to be connected and the unit has to be
turned on.
Page 14 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

4. DETAILED OPERATING INSTRUCTIONS
D. CONNECT BATTERY
Connect the battery DC cable to the battery and
ensure the connector is plugged in completely.
E. SWITCH ON MAINS POWER
Turn on the AC on-off/reset power switch. An
audible alarm sounds, and the Accept lamp
illuminates. Meters read all 6's or 8's.
F. VIEW AND SET CUTOFF VOLTAGE
a. Press and hold the View Voltage Cutoff
button. The set cutoff voltage is shown on the
voltmeter display.
b. Use a 1/16 inch (2 mm) slot blade precision
type screw driver to adjust the cutoff voltage
to the desired level.
NOTE: Actual cutoff voltages are slightly lower than the set nominal voltage in
order to give the battery an "accept advantage" and allowing the operator to
observe a marginal battery and decide its acceptance or rejection. The actual
cutoff value also depends on how fast the battery voltage is changing. Of
course, the higher the voltage at acceptance, the better the battery.
4.6 SETTING DISCHARGE CURRENT
The discharge current in amperes is normally set equal to, or 80% of, the battery
nominal 1-hour capacity rating (please refer to the battery manufacturer's maintenance
manual). For example, a SLAB battery with a 30 ampere-hour 1-hour capacity rating
would be tested with the discharge current set to 24 amperes.
Before setting the discharge current the Beta D-50 must have been connected to the
battery (see section 4.5) and the AC power switch must have been turned on.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 15

4. DETAILED OPERATING INSTRUCTIONS
G. PUSH START BUTTON
The audible alarm stops. The voltmeter displays the battery
voltage, the ammeter reads 0 and the timer starts. “OP” on the
timer illuminates and the red LED flashes.
H. SET DISCHARGE CURRENT
Slowly turn the multi-turn Ampere Adjust knob
clockwise to the desired discharge current. The
ammeter displays the current as it is being
adjusted.
4.7 TEST COMPLETION AND ANALYSIS
The Beta D-50 automatically completes the test with the set parameters. It may
however be required to measure the individual cell voltages for nickel-cadmium
batteries during the test (see section 4.7.2).
I. WAIT FOR THE DISCHARGE TEST TO AUTOMATICALLY
COMPLETE
During the test the battery voltage, discharge current, and elapsed discharge
times are displayed. The voltage will continuously decrease while the current
remains constant. The test completes when either the set discharge time or the low
cutoff voltage has been reached. An audible alarm sounds and the displays freeze
at their final values.
J. 1. IF TEST PASSED
The green Accept lamp illuminates. This
indicates the discharge has continued through the
duration of the set discharge time (the red LED and
“OP” on timer is off) without the cutoff voltage being
reached. The battery is usually fit for
service, after complete recharge. See 4.7.1 and
4.7.2 for respective battery type.
Page 16 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2

4. DETAILED OPERATING INSTRUCTIONS
2. IF TEST FAILED
The Fail lamp illuminates if the discharge has been
discontinued because the cutoff voltage has been
reached before the completion of the set discharge
time. The red LED goes out, but the time is frozen at
the elapsed time at which the test failed. The battery is
in need of reconditioning or must be rejected for
aircraft service. Refer to the battery manufacturer's
maintenance manual on how to proceed.
4.7.1 LEAD-ACID BATTERY
If the lead-acid battery has been accepted by the Beta D-50 discharge test it has
successfully completed the capacity test.
4.7.2 NICKEL-CADMIUM BATTERY
Check each cell with a digital voltmeter near the end of the test.
A. If no cells have dropped below 1.0 volts at the end of the specified time the battery
has successfully completed the capacity test.
B. If any cells have dropped below 1.0 volt before or at the end of the capacity test the
battery must be reconditioned (deep cycled). Please refer to the battery manufacturer's
maintenance manual on how to proceed.
K. SWITCH AC POWER OFF.
Switch the AC on-off/reset switch off before
removing the battery
NOTE: If in emergency it is required to stop the test,
switch the unit to off/reset. When the test is restarted the
timer is reset to zero. It may be necessary to recharge the
battery before resuming the test.
BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2 Page 17

5. CALIBRATION AND MAINTENANCE
5. CALIBRATION AND MAINTENANCE
5.1 OVERVIEW OF CALIBRATION
The Beta D-50 has been calibrated before shipment from the manufacturer. A
certificate of calibration has been issued and is enclosed in the back of this manual.
To ensure error-free operation over time the unit should be re-calibrated every 12 months
depending on usage and changes in surrounding environment.
5.1.1 DIGITAL PANEL METERS
There are two main indicators that can be periodically calibrated: 1) the voltmeter; and
2) the ammeter (see figure 1-1 in section 1). The Beta D-50 is equipped with two sets of test
jacks for easy calibration of these digital display meters. In addition the internal shunt, even
though calibrated and certified by the shunt manufacturer, could be verified.
5.1.2 TIMER
The timer is a very accurate crystal-controlled device, not prone to error. It cannot be
recalibrated, but unless an extremely accurate time reading is required, an accurate
analog or digital stop watch is adequate to validate its accuracy.
5.1.3 OPERATING RANGE
The Beta D-50 discharge current operating range can be modified if either 1) the lower
limit is off zero; or 2) a maximum limit different than factory-preset 50 amperes
discharge current is desired.
WARNING: Calibration should only be performed by
trained personnel. If performed incorrectly it could result in
electrical shock leading to injury or death.
5.2 VOLTMETER CALIBRATION
To calibrate the Beta D-50 voltmeter, an external calibrated digital voltmeter is required as
well as a fully charged battery. The circuit diagram for the calibration can be seen in figure
5-1. The calibration steps are outlined below.
Page 18 BETA D-50 TESTER / ANALYZER - OPERATING MANUAL V2.2