A.W. Sperry Instruments SP-152A User manual
1/94 Form #245
OPERATING INSTRUCTIONS
Model SP-152A
POCKET SIZE MULTLTESTER
A.W. SPERRY INSTRUMENTS INC.
245 MARCUS BLVD., HAUPPAUGE, NEW YORK 11788
Phone: 800-645-5398 Toll Free (N.Y. and Alaska call collect 516-231-7050)
Fax: 516-434-3128
A.W. SPERRY INSTRUMENTS INC.
245 MARCUS BLVD., HAUPPAUGE, NEW YORK 11788
Phone: 800-645-5398 Toll Free (N.Y. and Alaska call collect 516-231-7050)
Fax: 516-434-3128
PLEASE READ THESE OPERATING INSTRUCTIONS CAREFULLY
Misuse and or abuse of these instruments cannot be prevented by any
printed word and may cause injury and or equipment damage. Please
follow all these instructions and measurement procedures faithfully and
adhere to all standard industry safety rules and practices.
CONTENTS
Section Title Page
1 INTRODUCTION 2
2 SAFETY PRECAUTIONS 2
3 INSTRUMENT DATA 3
3-1 Description 3
3-2 Features 3
3-3 Specifications 4
3-4 Packaging 4
3-5 Front Panel Identification ?
4 PREPARATION FOR USE 5
5 OPERATION 6
5-1 Voltage Measurement 6
5-2 Current Measurement 7
5-3 Resistance Measurement 9
5-4 Battery Measurement 10
6 MAINTENANCE 11
6-1 Battery Replacement 11
6-2 Fuse Replacement 11
6-3 Cleaning 12
7 RETURN FOR REPAIR 12
Note: Subsequent revisions to this document may exist.
Use for general references only.
13
ONE YEAR LIMITED WARRANTY
A.W. Sperry Instruments, Inc., warrants that this
A.W. Sperry instrument has been carefully
tested, inspected, and warranted for one (1) year
from the date of purchase by the original end
user, provided the instrument has not been
misused, damaged due to negligence, neglect or
unauthorized repair, abused or used contrary to
the operating instructions. Instruments and proof
of purchase in the form of a legible copy or
original of the sales receipt clearly identifying the
distributor, model number and date of purchase
must be returned to A.W. Sperry Instruments,
Inc., Attention: Customer Service Center, 245
Marcus Boulevard, Hauppauge, New York
11788, postage prepaid for examination and
verification of manufacturing defect under
warranty. A.W. Sperry Instruments, Inc., shall be
the sole judge of such defect. The liability of
A.W. Sperry Instruments, Inc., shall be limited to
the repair or replacement at its sole option of any
defective product.
1
Sec. 7 RETURN FOR REPAIR
Before returning your Analog Multimeter for repair be certain
that the failure to operate is not caused by:
1. weak battery
2. open test leads.
If these conditions do not exist and the instrument still fails
to operate properly or is damaged, return the instrument and
accessories prepaid to:
A.W. Sperry Instruments, Inc.
Attn: Customer Service Dept.
245 Marcus Boulevard
Hauppauge, NY 11788
State in writing what is wrong with the instrument. If the
warranty period is still in effect you must include your name,
address and phone number. Repair estimates will be
furnished if requested for out of warranty instruments.
12
Sec. 1 INTRODUCTION
Congratulations. You have purchased an A.W. SPERRY
Analog Multimeter manufactured to the highest quality
standards. A minimum amount of maintenance and an
understanding of these operating instructions is all that is
needed to keep this instrument in excellent working
condition. If you should have any questions regarding this
product or would like a catalog on our other products please
write to us at:
A.W. Sperry Instruments, Inc.
P.O. Box 9300
Smithtown, NY 11787
or call us Toll-Free at
800-645-5398 or 516-231-7050
Please take the time to read these operating instructions
thoroughly and completely. Failure to follow these
instructions may result in electrical shock, instrument
damage and/or damage to the equipment under test.
Always use extreme caution when working on or around
electrically operated equipment.
Sec. 2 SAFETY PRECAUTIONS
Always inspect the instrument, test leads and other
accessories for damage prior to every use.
Always consider electrical and electronic equipment to be
energized (live). Never assume any equipment is de-
energized.
Never ground yourself when taking electrical
measurements. Isolate yourself from ground by using dry
rubber insulation mats to cover all exposed grounded metal.
Stand on rubber mats and wear dry clothing.
2
2. Turn instrument upside down and lay on a soft flat
surface which will not scratch the scale window.
3. Remove the phillips head screw and lift off the
back case.
4. Remove the battery by prying up near the center of
the battery using a coin.
5. Replace the battery with a new 1.5 Vdc, AA size
battery, A.W. SPERRY part B-1. When installing
the battery make sure the polarity matches that
indicated in the battery compartment.
6. Replace the back cover by sliding the end with the
small tab in first. Then replace the phillips head
screw and tighten to a snug fit. Do not over tighten
screw.
6-2) Fuse Replacement
1. Follow steps 1-3 in Section 6-1.
2. Remove the fuse and replace with a miniature
glass type fuse, 1/2 Amp, 250V, 1/4" X 11/4",
A.W. SPERRY Part #F-1 or approved equal.
CAUTION
Do not short fuse out of the circuit, or use a fuse with higher
rating than 1/2 Amp, or alter circuit to eliminate the fuse. These
actions negate the safety purpose of the fuse, can cause
extensive damage to the instrument and/or injury to the user.
6-3) Cleaning
The exterior of the instrument can be cleaned with a soft dry
cloth to remove any oil, grease or grime. Never use any
liquid solvents or detergents. Do not polish the instrument.
If the instrument gets wet for any reason, dry the inside and
outside of the instrument using low pressure air, less than
25 PSI.
11
Never take resistance measurements on energized(live)
electrical or electronic equipment.
Use one hand, instead of two, whenever possible to take
measurements. If two hands must be used, use extreme
caution not to contact any energized conductors with your
hands. Be certain test lead probes are dry and clean.
Do not hold the instrument when taking measurements.
Place the instrument on a clean, insulating surface prior to
taking any measurement.
Don’t become part of the circuit. Think Safety.
Act Safely.
Sec. 3 INSTRUMENT DATA
3-1) Description
The A.W. SPERRY SP-152A is an Analog Multimeter
capable of:
Measuring 7 functions on 20 ranges. A mirror scale is
provided to reduce the possibility of parallax errors. Small,
light weight and rugged construction. This meter was
designed for the amateur, hobbyist and professional
needing to make electrical and electronic equipment
measurements.
3-2) Features
1. 7 Functions - 20 Ranges
2. Limited One Year Warranty
3. Ruggedized, Impact Resistant
4. Industry Standard Safety Recessed Input
Terminals and Shielded Banana Plugs
5. Mirrored Scale Plate
6. Safety Fuse Protected
7. Diode Protected Meter Movement
310
5-4) Battery Measurements
1. Follow the Preparation for use procedure in sec. 4.
2. Read all safety precautions in sec. 2.
3. The SP-152A comes with two separate battery
check ranges that enable you to test 1.5Vdc or
9Vdc batteries.
4. Connect red probe to + Jack, black to - Jack.
5. Set the range selector switch to 9V battery check
range.
6. Connect the test leads to the 9Vdc battery under
test. A good 9Vdc battery will read in the green
portion of the Arc.
7. To check 1.5Vdc batteries follow the above
procedures with the range selector switch set to
the 1.5Vdc range.
8. The “?” section on the scale plate shows that the
battery may be starting to decay.
SYMBOLS
V DIRECT VOLTAGE (DCV)
V~ ALERATIVE VOLTAGE (ACV)
MA DIRECT CURRENT (DcmA)
EARTH (GROUND) TERMINAL
DOUBLE INSULATION
Sec. 6 MAINTENANCE
6-1) Battery Replacement
WARNING: To avoid electric shock, disconnect
measuring terminals before removing cover.
1. Disconnect test leads form any circuit and then
disconnect test leads from the instrument.
—
…
—
…
!
the test leads from the circuit under test, then
remove the test leads from the instrument.
5-3) Resistance Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all safety precautions in sec. 2.
CAUTION
Resistance measurements must be made on de-energized
(dead) circuits only. Impressing a voltage across the instrument
terminals while set to any resistance range may result in electric
shock, instrument damage and/or damage to equipment under
test. Be certain equipment is completely de-energized.
3. Completely de-energize the circuit or device
which is to be measured. Set the selector switch
to the range desired. Hold the test lead tips
together and adjust for a “0” ohm reading using
the “0Ωadj” knob. If a zero reading cannot be
obtained, a weak battery is the most probable
cause. See section 6.1 (Battery Replacement).
4. Connect the instrument to the points between
which the resistance is to be measured. Read the
resistance on the uppermost “OHMS” scale.
Multiply the reading by the range the selector
switch is set to. For example a reading of 10 on
the “x1K” range equals 10K ohm (1K = 1000Ω).
NOTE: When reading resistors in circuit, there may exist
more than one conductive path. When this condition exists,
the reading taken is a combination of the circuit paths.
When trying to read one resistor, it is advisable to remove
that resistor from the circuit before measurement to avoid
reading multiply conductive paths.
9
8. Battery Test Function
9. Handy Tiltstand/ Carry Handle
10. Perfect for the Homeowner, Hobbyist and
Professional
3-3) Specifications
Sensitivity: 20KΩ/VDC, 9KΩ/VAC
Accuracy: DC ± 3% Full Scale
AC ± 4% Full Scale
Ω± 3% Arc Length
Fuse: One (1) 1/2 Amp. 250V, 1/4" X 11/4",
A.W. SPERRY Part #F-1
Power Source: Two (1) 1.5V AA size batteries
A.W. SPERRY part No. B-1
Size: 5.4"H x 3.7"W x 1.8"D
(137 x 95 x 45mm)
Weight: 9.5 oz. (270 g)
Ranges and Accuracy
DC Voltage: 0-2.5/10/50/250/1000 Vdc
AC Voltage: 0-10/50/250/1000 Vac
DC Current: 0-5m/50m/500mA/20Adc
Resistance: 0-10K/100K/10MΩ
(50/500/50KΩMid-Scale)
Battery: 1.5V/9Vdc
Continuity Buzzer
Decibels: -8 to +62dB
3-4) Packaging
Comes complete with one set TL-56 Test Leads, two B-1
“AA” type Batteries (installed in the instrument), one F-1
Fuse (Installed) and Form #245 Operating Instructions.
4
CAUTION
The 20A range is unprotected and has a very low internal
resistance. Do not attempt to take a current measurement if the
current is unknown or above 20Adc.
WARNING
The instrument must be connected in series with the circuit to be
measured. Do not impress voltages across the “COM” and “V-Ω-
mA” terminals when set to the mADC ranges. Doing so may
result in electric shock, instrument damage and/or damage to
equipment under test.
5. Remove power from the circuit to be tested and
discharge all capacitors and inductors.
6. Connect the test leads into the circuit so that the
meter is in series with the circuit where current is to
be measured. The current should enter through the
red lead and leave through the black lead in order
for the meter to indicate in an “up-scale” direction.
7. Turn on power to the circuit under test. Read the
current on the black DC scale and use the full scale
numbers which correspond to the range selected
(in the case for the 20A range 0-20).
WARNING
Before changing ranges always de-energize the circuit
completely. An open circuit exists between the test leads during
range change.
8. If the reading is less than 1/2 amp, repeat steps 5
and 6 with the switch set on the 500mA range and
the test leads in the V-Ω-A terminal. Repeat the
above procedures until the reading is in the upper
half of the scaleplate.
9. Turn off the power to the circuit under test.
Discharge all capacitors and inductors. Remove
8
Sec. 4 PREPARATION FOR USE
This procedure should be followed before each and every
use.
CAUTION
Before attempting to use this meter be certain to read this
operating instruction thoroughly and completely. Failure to follow
these instructions may result in electrical shock, instrument
damage and/or damage to equipment under test.
1. Inspect the SP-152A Analog Multimeter for any
signs of damage to the thermoplastic case. Do not use
if cracked, distorted, excessively dirty or any other
abnormal condition exists. Refer to sec. 7.
2.Rotate the selector switch one full turn. Check that
the switch clicks into each of the 20 positions and has
no excessive play in each position. Do not use if the
switch is loose. Refer to sec. 7.
3.
Inspect the TL-56 test leads for any signs of damage.
Check for cracks in the insulation, broken or damaged
probes, loose probe pins or bent probe pins. Do not
use if any abnormal conditions exist. Refer to sec. 7.
4. Place the SP-152A Analog Multimeter on a flat
horizontal surface. Using a small screw driver adjust
the “zero adjust” screw until the meter movement
pointer lines up with the “0” reading on the left side of
the scale plate.
5. Insert the black test lead into the “-” (Com) terminal
of the SP-152A and the red test lead into the “+”
(V-Ω-A) terminal. Make certain that the leads are
seated all the way into the SP-152A and fit snugly. If
the fit feels loose do not use the SP-152A or the test
leads. Refer to sec. 7.
5
4. Apply the test leads to the two points in the circuit at
which the voltage is to be measured. When
measuring DC voltage the black lead should be
connected to the more negative point of
measurement. When measuring AC voltage the
polarity does not matter.
5. To read DC voltage use the black “DC” arc directly
below the mirrored arc. Use the numbers whose full
scale reading matches the range selected by the
“selector switch”.
6. To read AC voltage use the red “AC” arc. Use the
numbers whose full scale reading matches the range
selected by the “selector switch”.
7. The dB scales can be used to measure the milliwatt
power dissipation in a 600 load by measuring the AC
voltage across a 600 OHM load. An AC voltage of
0.775 Vrms across 600 OHMS is equal to 1mW or “0”
dB. When converting an AC voltage measurement to
dB take the dB readings from the lowest arc on the
scale plate and then add the appropriate dB correction
as listed in the chart printed in the lower right corner of
the instrument scale plate.
5-2) DC Current Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all Safety Precautions in sec. 2.
3. Place the function switch to the 20A position,
always start with the highest range.
4. Place the red test lead in the “DC20A” terminal, and
the black test lead in the “COM” terminal.
7
6. Please the selector switch on the SP-152A into the
“X1K” position, hold the tips of the Red and Black test
leads together and adjust the “OHMS adjust knob”
until the meter movement pointer reads “0” on the
OHMS scale located at the extreme right side of the
scale plate. If a “0” reading cannot be obtained a
weak battery is the most probable cause. Follow the
battery replacement procedure in sec. 6-1.
Note: The battery is only used for resistance
measurements with the selector switch in the “X1”,”X10” or
“X1K” positions. The SP-152A can be used in all other
ranges with a weak, dead or missing battery.
7. The SP-152A is now ready for use. Follow the
Measurement procedures in this manual for all
measurements. Read all Safety Precautions in sec. 2
before proceeding.
Sec. 5 OPERATION
5-1) Voltage Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all Safety Precautions in sec. 2.
CAUTION
1000 Vac/dc is the maximum voltage that can be measured
using this meter. Attempting to measure higher voltages may
result in electrical shock, instrument damage and/or damage to
equipment under test.
3. Select an AC or DC voltage range using the selector
switch that is higher than the maximum voltage to be
measured. If the maximum voltage may be higher
than 1000 Vac/dc, do not attempt to take a
measurement.
6
4. Apply the test leads to the two points in the circuit at
which the voltage is to be measured. When
measuring DC voltage the black lead should be
connected to the more negative point of
measurement. When measuring AC voltage the
polarity does not matter.
5. To read DC voltage use the black “DC” arc directly
below the mirrored arc. Use the numbers whose full
scale reading matches the range selected by the
“selector switch”.
6. To read AC voltage use the red “AC” arc. Use the
numbers whose full scale reading matches the range
selected by the “selector switch”.
7. The dB scales can be used to measure the milliwatt
power dissipation in a 600 load by measuring the AC
voltage across a 600 OHM load. An AC voltage of
0.775 Vrms across 600 OHMS is equal to 1mW or “0”
dB. When converting an AC voltage measurement to
dB take the dB readings from the lowest arc on the
scale plate and then add the appropriate dB correction
as listed in the chart printed in the lower right corner of
the instrument scale plate.
5-2) DC Current Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all Safety Precautions in sec. 2.
3. Place the function switch to the 20A position,
always start with the highest range.
4. Place the red test lead in the “DC20A” terminal, and
the black test lead in the “COM” terminal.
7
6. Please the selector switch on the SP-152A into the
“X1K” position, hold the tips of the Red and Black test
leads together and adjust the “OHMS adjust knob”
until the meter movement pointer reads “0” on the
OHMS scale located at the extreme right side of the
scale plate. If a “0” reading cannot be obtained a
weak battery is the most probable cause. Follow the
battery replacement procedure in sec. 6-1.
Note: The battery is only used for resistance
measurements with the selector switch in the “X1”,”X10” or
“X1K” positions. The SP-152A can be used in all other
ranges with a weak, dead or missing battery.
7. The SP-152A is now ready for use. Follow the
Measurement procedures in this manual for all
measurements. Read all Safety Precautions in sec. 2
before proceeding.
Sec. 5 OPERATION
5-1) Voltage Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all Safety Precautions in sec. 2.
CAUTION
1000 Vac/dc is the maximum voltage that can be measured
using this meter. Attempting to measure higher voltages may
result in electrical shock, instrument damage and/or damage to
equipment under test.
3. Select an AC or DC voltage range using the selector
switch that is higher than the maximum voltage to be
measured. If the maximum voltage may be higher
than 1000 Vac/dc, do not attempt to take a
measurement.
6
CAUTION
The 20A range is unprotected and has a very low internal
resistance. Do not attempt to take a current measurement if the
current is unknown or above 20Adc.
WARNING
The instrument must be connected in series with the circuit to be
measured. Do not impress voltages across the “COM” and “V-Ω-
mA” terminals when set to the mADC ranges. Doing so may
result in electric shock, instrument damage and/or damage to
equipment under test.
5. Remove power from the circuit to be tested and
discharge all capacitors and inductors.
6. Connect the test leads into the circuit so that the
meter is in series with the circuit where current is to
be measured. The current should enter through the
red lead and leave through the black lead in order
for the meter to indicate in an “up-scale” direction.
7. Turn on power to the circuit under test. Read the
current on the black DC scale and use the full scale
numbers which correspond to the range selected
(in the case for the 20A range 0-20).
WARNING
Before changing ranges always de-energize the circuit
completely. An open circuit exists between the test leads during
range change.
8. If the reading is less than 1/2 amp, repeat steps 5
and 6 with the switch set on the 500mA range and
the test leads in the V-Ω-A terminal. Repeat the
above procedures until the reading is in the upper
half of the scaleplate.
9. Turn off the power to the circuit under test.
Discharge all capacitors and inductors. Remove
8
Sec. 4 PREPARATION FOR USE
This procedure should be followed before each and every
use.
CAUTION
Before attempting to use this meter be certain to read this
operating instruction thoroughly and completely. Failure to follow
these instructions may result in electrical shock, instrument
damage and/or damage to equipment under test.
1. Inspect the SP-152A Analog Multimeter for any
signs of damage to the thermoplastic case. Do not use
if cracked, distorted, excessively dirty or any other
abnormal condition exists. Refer to sec. 7.
2.Rotate the selector switch one full turn. Check that
the switch clicks into each of the 20 positions and has
no excessive play in each position. Do not use if the
switch is loose. Refer to sec. 7.
3.
Inspect the TL-56 test leads for any signs of damage.
Check for cracks in the insulation, broken or damaged
probes, loose probe pins or bent probe pins. Do not
use if any abnormal conditions exist. Refer to sec. 7.
4. Place the SP-152A Analog Multimeter on a flat
horizontal surface. Using a small screw driver adjust
the “zero adjust” screw until the meter movement
pointer lines up with the “0” reading on the left side of
the scale plate.
5. Insert the black test lead into the “-” (Com) terminal
of the SP-152A and the red test lead into the “+”
(V-Ω-A) terminal. Make certain that the leads are
seated all the way into the SP-152A and fit snugly. If
the fit feels loose do not use the SP-152A or the test
leads. Refer to sec. 7.
5
the test leads from the circuit under test, then
remove the test leads from the instrument.
5-3) Resistance Measurements
1. Follow the Preparation for Use procedure in sec. 4.
2. Read all safety precautions in sec. 2.
CAUTION
Resistance measurements must be made on de-energized
(dead) circuits only. Impressing a voltage across the instrument
terminals while set to any resistance range may result in electric
shock, instrument damage and/or damage to equipment under
test. Be certain equipment is completely de-energized.
3. Completely de-energize the circuit or device
which is to be measured. Set the selector switch
to the range desired. Hold the test lead tips
together and adjust for a “0” ohm reading using
the “0Ωadj” knob. If a zero reading cannot be
obtained, a weak battery is the most probable
cause. See section 6.1 (Battery Replacement).
4. Connect the instrument to the points between
which the resistance is to be measured. Read the
resistance on the uppermost “OHMS” scale.
Multiply the reading by the range the selector
switch is set to. For example a reading of 10 on
the “x1K” range equals 10K ohm (1K = 1000Ω).
NOTE: When reading resistors in circuit, there may exist
more than one conductive path. When this condition exists,
the reading taken is a combination of the circuit paths.
When trying to read one resistor, it is advisable to remove
that resistor from the circuit before measurement to avoid
reading multiply conductive paths.
9
8. Battery Test Function
9. Handy Tiltstand/ Carry Handle
10. Perfect for the Homeowner, Hobbyist and
Professional
3-3) Specifications
Sensitivity: 20KΩ/VDC, 9KΩ/VAC
Accuracy: DC ± 3% Full Scale
AC ± 4% Full Scale
Ω± 3% Arc Length
Fuse: One (1) 1/2 Amp. 250V, 1/4" X 11/4",
A.W. SPERRY Part #F-1
Power Source: Two (1) 1.5V AA size batteries
A.W. SPERRY part No. B-1
Size: 5.4"H x 3.7"W x 1.8"D
(137 x 95 x 45mm)
Weight: 9.5 oz. (270 g)
Ranges and Accuracy
DC Voltage: 0-2.5/10/50/250/1000 Vdc
AC Voltage: 0-10/50/250/1000 Vac
DC Current: 0-5m/50m/500mA/20Adc
Resistance: 0-10K/100K/10MΩ
(50/500/50KΩMid-Scale)
Battery: 1.5V/9Vdc
Continuity Buzzer
Decibels: -8 to +62dB
3-4) Packaging
Comes complete with one set TL-56 Test Leads, two B-1
“AA” type Batteries (installed in the instrument), one F-1
Fuse (Installed) and Form #245 Operating Instructions.
4
Never take resistance measurements on energized(live)
electrical or electronic equipment.
Use one hand, instead of two, whenever possible to take
measurements. If two hands must be used, use extreme
caution not to contact any energized conductors with your
hands. Be certain test lead probes are dry and clean.
Do not hold the instrument when taking measurements.
Place the instrument on a clean, insulating surface prior to
taking any measurement.
Don’t become part of the circuit. Think Safety.
Act Safely.
Sec. 3 INSTRUMENT DATA
3-1) Description
The A.W. SPERRY SP-152A is an Analog Multimeter
capable of:
Measuring 7 functions on 20 ranges. A mirror scale is
provided to reduce the possibility of parallax errors. Small,
light weight and rugged construction. This meter was
designed for the amateur, hobbyist and professional
needing to make electrical and electronic equipment
measurements.
3-2) Features
1. 7 Functions - 20 Ranges
2. Limited One Year Warranty
3. Ruggedized, Impact Resistant
4. Industry Standard Safety Recessed Input
Terminals and Shielded Banana Plugs
5. Mirrored Scale Plate
6. Safety Fuse Protected
7. Diode Protected Meter Movement
310
5-4) Battery Measurements
1. Follow the Preparation for use procedure in sec. 4.
2. Read all safety precautions in sec. 2.
3. The SP-152A comes with two separate battery
check ranges that enable you to test 1.5Vdc or
9Vdc batteries.
4. Connect red probe to + Jack, black to - Jack.
5. Set the range selector switch to 9V battery check
range.
6. Connect the test leads to the 9Vdc battery under
test. A good 9Vdc battery will read in the green
portion of the Arc.
7. To check 1.5Vdc batteries follow the above
procedures with the range selector switch set to
the 1.5Vdc range.
8. The “?” section on the scale plate shows that the
battery may be starting to decay.
SYMBOLS
V DIRECT VOLTAGE (DCV)
V~ ALERATIVE VOLTAGE (ACV)
MA DIRECT CURRENT (DcmA)
EARTH (GROUND) TERMINAL
DOUBLE INSULATION
Sec. 6 MAINTENANCE
6-1) Battery Replacement
WARNING: To avoid electric shock, disconnect
measuring terminals before removing cover.
1. Disconnect test leads form any circuit and then
disconnect test leads from the instrument.
—
…
—
…
!
Sec. 1 INTRODUCTION
Congratulations. You have purchased an A.W. SPERRY
Analog Multimeter manufactured to the highest quality
standards. A minimum amount of maintenance and an
understanding of these operating instructions is all that is
needed to keep this instrument in excellent working
condition. If you should have any questions regarding this
product or would like a catalog on our other products please
write to us at:
A.W. Sperry Instruments, Inc.
P.O. Box 9300
Smithtown, NY 11787
or call us Toll-Free at
800-645-5398 or 516-231-7050
Please take the time to read these operating instructions
thoroughly and completely. Failure to follow these
instructions may result in electrical shock, instrument
damage and/or damage to the equipment under test.
Always use extreme caution when working on or around
electrically operated equipment.
Sec. 2 SAFETY PRECAUTIONS
Always inspect the instrument, test leads and other
accessories for damage prior to every use.
Always consider electrical and electronic equipment to be
energized (live). Never assume any equipment is de-
energized.
Never ground yourself when taking electrical
measurements. Isolate yourself from ground by using dry
rubber insulation mats to cover all exposed grounded metal.
Stand on rubber mats and wear dry clothing.
2
2. Turn instrument upside down and lay on a soft flat
surface which will not scratch the scale window.
3. Remove the phillips head screw and lift off the
back case.
4. Remove the battery by prying up near the center of
the battery using a coin.
5. Replace the battery with a new 1.5 Vdc, AA size
battery, A.W. SPERRY part B-1. When installing
the battery make sure the polarity matches that
indicated in the battery compartment.
6. Replace the back cover by sliding the end with the
small tab in first. Then replace the phillips head
screw and tighten to a snug fit. Do not over tighten
screw.
6-2) Fuse Replacement
1. Follow steps 1-3 in Section 6-1.
2. Remove the fuse and replace with a miniature
glass type fuse, 1/2 Amp, 250V, 1/4" X 11/4",
A.W. SPERRY Part #F-1 or approved equal.
CAUTION
Do not short fuse out of the circuit, or use a fuse with higher
rating than 1/2 Amp, or alter circuit to eliminate the fuse. These
actions negate the safety purpose of the fuse, can cause
extensive damage to the instrument and/or injury to the user.
6-3) Cleaning
The exterior of the instrument can be cleaned with a soft dry
cloth to remove any oil, grease or grime. Never use any
liquid solvents or detergents. Do not polish the instrument.
If the instrument gets wet for any reason, dry the inside and
outside of the instrument using low pressure air, less than
25 PSI.
11
ONE YEAR LIMITED WARRANTY
A.W. Sperry Instruments, Inc., warrants that this
A.W. Sperry instrument has been carefully
tested, inspected, and warranted for one (1) year
from the date of purchase by the original end
user, provided the instrument has not been
misused, damaged due to negligence, neglect or
unauthorized repair, abused or used contrary to
the operating instructions. Instruments and proof
of purchase in the form of a legible copy or
original of the sales receipt clearly identifying the
distributor, model number and date of purchase
must be returned to A.W. Sperry Instruments,
Inc., Attention: Customer Service Center, 245
Marcus Boulevard, Hauppauge, New York
11788, postage prepaid for examination and
verification of manufacturing defect under
warranty. A.W. Sperry Instruments, Inc., shall be
the sole judge of such defect. The liability of
A.W. Sperry Instruments, Inc., shall be limited to
the repair or replacement at its sole option of any
defective product.
1
Sec. 7 RETURN FOR REPAIR
Before returning your Analog Multimeter for repair be certain
that the failure to operate is not caused by:
1. weak battery
2. open test leads.
If these conditions do not exist and the instrument still fails
to operate properly or is damaged, return the instrument and
accessories prepaid to:
A.W. Sperry Instruments, Inc.
Attn: Customer Service Dept.
245 Marcus Boulevard
Hauppauge, NY 11788
State in writing what is wrong with the instrument. If the
warranty period is still in effect you must include your name,
address and phone number. Repair estimates will be
furnished if requested for out of warranty instruments.
12
CONTENTS
Section Title Page
1 INTRODUCTION 2
2 SAFETY PRECAUTIONS 2
3 INSTRUMENT DATA 3
3-1 Description 3
3-2 Features 3
3-3 Specifications 4
3-4 Packaging 4
3-5 Front Panel Identification ?
4 PREPARATION FOR USE 5
5 OPERATION 6
5-1 Voltage Measurement 6
5-2 Current Measurement 7
5-3 Resistance Measurement 9
5-4 Battery Measurement 10
6 MAINTENANCE 11
6-1 Battery Replacement 11
6-2 Fuse Replacement 11
6-3 Cleaning 12
7 RETURN FOR REPAIR 12
Note: Subsequent revisions to this document may exist.
Use for general references only.
13
1/94 Form #245
OPERATING INSTRUCTIONS
Model SP-152A
POCKET SIZE MULTLTESTER
A.W. SPERRY INSTRUMENTS INC.
245 MARCUS BLVD., HAUPPAUGE, NEW YORK 11788
Phone: 800-645-5398 Toll Free (N.Y. and Alaska call collect 516-231-7050)
Fax: 516-434-3128
A.W. SPERRY INSTRUMENTS INC.
245 MARCUS BLVD., HAUPPAUGE, NEW YORK 11788
Phone: 800-645-5398 Toll Free (N.Y. and Alaska call collect 516-231-7050)
Fax: 516-434-3128
PLEASE READ THESE OPERATING INSTRUCTIONS CAREFULLY
Misuse and or abuse of these instruments cannot be prevented by any
printed word and may cause injury and or equipment damage. Please
follow all these instructions and measurement procedures faithfully and
adhere to all standard industry safety rules and practices.
Table of contents
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