Sperry instrument DSA-540A Operating Instructions Manual

1

. FEATURES

•

Safety design conforming to the following
provisions of IEC61010.

• Overvoltage category III 300V AC, pollution
d

egree 2.

•

Overvoltage category II 600V AC/DC, pollution
d

egree 2.

•

Protected throughout by double or reinforced
i

nsulation, indicated the International Electrical

S

ymbol “ ” on the bottom of the instrument.

•

Data hold switch for easy reading in dimly light
or hard-to-read locations.

•

“Sleep” feature to extend battery life.

•

Beeper permits easy continuity check.

•

Provides a dynamic range of 4,000 counts full
s

cale.

• Uses shrouded transformer jaws to further
i

mprove safety.

2

. SAFETY WARNINGS

• This instrument has been designed and tested
a

ccording to IEC Publication 61010: Safety
Requirements for Electronic Measuring
A

pparatus. This instruction manual contains

w

arnings and safety rules which must be
observed by the user to ensure safe operation
o

f the instrument and retain it in safe condition.

T

herefore, read through these operating

instructions before using the instrument.

WARNING

•

Read through and understand instructions
c

ontained in this manual before using the

instrument.

•

Save and keep the manual handy to enable
q

uick reference whenever necessary.

• Be sure to use the instrument only in its
intended applications and to follow
m

easurement procedures described in the

m

anual.

• Be sure to understand and follow all safety
instructions contained in the manual. Failure to
f

ollow the above instructions may cause injury,

i

nstrument damage and/or damage to

equipment under test.

T

he symbol indicated on the instrument means

t

hat the user must refer to related parts in the
manual for safe operation of the instrument. Be
sure to carefully read the instructions following
e

ach symbol in this manual.

D

ANGERis reserved for conditions and

a

ctions that are likely to cause serious or fatal

i

njury.

WARNING is reserved for conditions and
actions that can cause serious or fatal injury.

C

actions that can cause minor injury or
i

•

Never make measurement on a circuit with a
v

•

Do not attempt to make measurement in the
p
o
m
e

•

Transformer jaws are made of metal and their
tips are not insulated. Where equipment under
t
e
possible shorting.

• Never attempt to use the instrument if its
s

•

Do not exceed the maximum allowable input of
a

• Never open the battery compartment cover
w

•

Never attempt to make any measurement if
a
b
metal part.

•

Do not turn the function selector switch with
p
u

• Do not install substitute parts or make any
modification to the instrument. Return the
i
r

• Do not try to replace the batteries if the surface
of the instrument is wet.

•

Always switch off the instrument before
o
battery replacement.

•

Make sure that the function selector switch is
set to the appropriate position before making
measurement.

•

Always make sure to insert each plug of the
t
the instrument.

• Make sure to remove the test leads from the
i

•

Do not expose the instrument to the direct sun,
extreme temperatures or dew fall.

2/04 FORM #322

OPERATING INSTRUCTIONS

MODEL DSA-540A

AC/DC DIGISNAP

SNAP-AROUND

A.W. SPERRY INSTRUMENTS INC.

The Professional’s Choice

®

T

ransformer Jaws

Trigger

F

unction

S

elector

Switch

Data Hold and
O

AOJ Switch

D

isplay

V/Ω Terminal

COM T

e

rminal

!

!

!

!

!

•

• O

• S

• P

•

•

•

•

•

•

•

•

•

•

•

4

. PREPARATION FOR MEASUREMENT

4-1 Checking Battery Voltage

Set the function selector switch to any position
o

ther than “OFF”. When the display is clear

w

ithout “BAT” showing, proceed to measurement.

When the display blanks or “BAT” is indicated,
replace the batteries according to the instructions
d

escribed in section 9 (Battery Replacement).

WARNING is reserved for conditions and
actions that can cause serious or fatal injury.

C

AUTIONis reserved for conditions and

actions that can cause minor injury or
i

nstrument damage.

DANGER

•

Never make measurement on a circuit with a
v

oltage higher than 600 V AC/DC.

•

Do not attempt to make measurement in the
p

resence of flammable gasses, fumes, vapor

o

r dust. Otherwise, the use of the instrument

m

ay cause sparking, which can lead to an

e

xplosion.

•

Transformer jaws are made of metal and their
tips are not insulated. Where equipment under
t

est has exposed conductive parts, be

e

specially careful to avoid the hazard of

possible shorting.

• Never attempt to use the instrument if its
s

urface or your hand is wet.

•

Do not exceed the maximum allowable input of
a

ny measurement range.

• Never open the battery compartment cover
w

hen making measurement.

WARNING

•

Never attempt to make any measurement if
a

ny abnormal conditions are noted, such as

b

roken case, cracked test leads and exposed

metal part.

•

Do not turn the function selector switch with
p

lugged in test leads connected to the circuit

u

nder test.

• Do not install substitute parts or make any
modification to the instrument. Return the
i

nstrument to your distributor for repair or

r

ecalibration.

• Do not try to replace the batteries if the surface
of the instrument is wet.

•

Always switch off the instrument before
o

pening the battery compartment cover for

battery replacement.

C

AUTION

•

Make sure that the function selector switch is
set to the appropriate position before making
measurement.

•

Always make sure to insert each plug of the
t

est leads fully into the appropriate terminal on

the instrument.

• Make sure to remove the test leads from the
i

nstrument before making current measurement.

•

Do not expose the instrument to the direct sun,
extreme temperatures or dew fall.

•

Be sure to set the function selector switch to
the “OFF” position after use. When the instru
m

ent will not be in use for a long period of time,

p

lace it in storage after removing the battery.

• Use a damp cloth and detergent for cleaning
t

he instrument. Do not use abrasives or

s

olvents.

3

. SPECIFICATIONS

Measuring Ranges and Accuracy (at 23±5°C.,
4

5-75% relative humidity)

AC Current (A) Auto-ranging (50/60Hz)
Range Measuring Range Accuracy
40A 0-40.00A ±3.0%rdg±8dgt

4

00A

1

5.0-299.9A ±3.5%rdg±6dgt

3

00.0-400.0A ±4.0%rdg±6dgt

D

C Current (A) Auto-ranging

Range Measuring Range Accuracy
40A 0-40.00A ±3.0%rdg±8dgt

4

00A

15.0-299.9A ±3.5%rdg±6dgt
3

00.0-400.0A ±4.0%rdg±6dgt

A

C Voltage (V) Auto-ranging (50/60Hz)

R

ange Measuring Range Accuracy

4

00V 0-400.0V

±

2.0%rdg±5dgt

6

00V 150-600V

D

C Voltage (V) Auto-ranging

R

ange Measuring Range Accuracy

4

00V 0-400.0V

±

1.5%rdg±5dgt

600V 150-600V

R

esistance(Ω/Continuity) Auto-ranging

(

Buzzer beeps below 50±

35Ω)

R

ange Measuring Range Accuracy

400Ω 0-400.0Ω

±

2.0%rdg±5dgt

4000Ω 150-4000Ω

•

O

perating System:

Dual Integration

•

Display:

L

iquid crystal display (maximum count: 4199)

• Low Battery Warning:

“BAT” is shown on the display

•

O

verrange Indication:

“

OL” is shown on the display

•

Response Time:

Approx. 2 seconds

•

Sample Rate:

A

bout 2.5 times per second

!

!

!

!

!

5

-2 DC Current Measurement

(

1)Set the function selector switch to the “DCA”

(2) With the transformer jaws closed and without

(

3)Press the trigger to open the transformer jaws

(4) Take the reading on the display.

W
underside of the instrument, the polarity of the
reading is positive (+). Othewise, the polarity of
t

he reading is negative (-).

6. VOLTAGE MEASUREMENT

• Never use the instrument on a circuit with a
v
e
i

• Do not make measurement with the battery
c

6-1 AC Voltage Measurement

(

1)Set the function selector switch to the “ACV”

(

2)Plug the red test lead into the V/Ω terminal

(3) Connect the test lead prods to the circuit under

6-2 DC Voltage Measurement

(

1)Set the function selector switch to the “DCV”
(2) Plug the red test lead into the V/Ω terminal
(

3)Connect the test lead prods to the circuit under

NOTE

The sleep feature automatically turns the
instrument off in a certain period of time after the
l

ast switch operation. Therefore, the display may

b

e blank with the function selector switch set to a

p

osition other than “OFF”. To operate the
instrument in this case, set the switch back to the
“

OFF” position, then to the desired position, or

p

ress any switch. If the display still blanks, the bat­t

eries are exhausted. Replace the batteries.

4

-2 Checking Switch Setting and Operation

M

ake sure that the function selector switch is set

t

o the correct position and the data hold switch is

deactivated. Otherwise, desired measurement
c

annot be made.

5

. CURRENT MEASUREMENT

W

ARNING

•

Do not make measurement on a circuit with a
v

oltage higher than 600 V AC/DC. Otherwise,
shock hazard or damage to the instrument or
e

quipment under test may result.

•

Transformer jaw tips are designed to minimize
t

he possibility of shorting conductors in the
circuit under test. If equipment under test has
e

xposed conductive parts, however, extra

p

recaution should be taken to avoid possible

s

horting.

• Do not make measurement with the battery
compartment cover removed.

•

Do not make current measurement with the
t

est leads connected to the instrument.

N

OTE

•

During current measurement, keep the
t

ransformer jaws fully closed. Otherwise,
accurate measurement cannot be made. The
maximum conductor size is 30 mm in diameter.

•

When measuring a larger current, the
t

ransformer jaws may buzz. This does not
affect the instrument’s accuracy.

5

-1 AC Current Measurement

(

1)Set the function selector switch to the “ACA”
position.

(2) Press the trigger to open the transformer jaws

a

nd clamp onto one conductor only.

(

3)Take the reading on the display.

• Be sure to use the instrument only in its
intended applications and to follow
m

easurement procedures described in the

m

anual.

• Be sure to understand and follow all safety
instructions contained in the manual. Failure to
follow the above instructions may cause injury,

•

T

emperature and Humidity for Guranteed

A

ccuracy:

23±5°C, relative humidity up to 85% without
c

ondensation

• O

perating Temperature and Humidity:

0~40°C, relative humidity up to 85% without
c

ondensation

• S

torage Temperature and Humidity:

-

20~60., relative humidity up to 85% without

condensation

• P

ower Source:

T

wo R03 or equivalent(DC1.5V)batteries

•

C

urrent Consumption:

Approx. 15mA max. (ACA, DCA Range)
Approx. 5mA max. (ACV, DCV, O Range)

•

S

leep Function:

A

utomatically powered down in about 10

m

inutes after the last switch operation (power

consumption in the sleep mode is about 35µA.)

•

S

tandards:

I

EC61010-1
CAT.III 300V AC, pollution degree 2
CAT.II 600V AC/DC, pollution degree 2
I

EC61010-2-031
I

EC61010-2-032

•

O

verload Protection:

AC current ranges: 480AAC/DC for 10sec
A

C voltage ranges: 720V AC/DC for 10sec

R

esistance ranges: 300V AC/DC for 10sec

•

O

perating Environmental Conditions:

Indoor use, Altitude up to 2000m

•

W

ithstand Voltage:

3

700VAC(RMS,50/60Hz)for 1 minute between

electrical circuit and housing case

•

Insulation Resistance:

1

0MΩ or greater at 1000V between electrical

c

ircuit and housing case

•

C

onductor Size:

Approx. 30 mm diameter max

•

D

imensions:

1

87(L) x 68.5(W) x 38.5 (D)

•

W

eight:

Approx. 200g (including batteries)

•

Accessories:

T

est leads, Two R03 batteries, Instruction manual

4

. PREPARATION FOR MEASUREMENT

4-1 Checking Battery Voltage

Set the function selector switch to any position
o

ther than “OFF”. When the display is clear

w

ithout “BAT” showing, proceed to measurement.
When the display blanks or “BAT” is indicated,
replace the batteries according to the instructions
d

escribed in section 9 (Battery Replacement).

!

C

orrect

instrument damage and/or damage to
equipment under test.

5

-2 DC Current Measurement

(

1)Set the function selector switch to the “DCA”
p

osition

(2) With the transformer jaws closed and without

c

lamping them onto the conductor, press the

0

ADJ. Switch for more than 2 seconds to zero

a

djust the display. (less than 2 seconds: Data
Hold Function operates.) The 0 ADJ. Switch is
e

nabled only on DC 40A range.

(

3)Press the trigger to open the transformer jaws
a

nd clamp onto one conductor only.

(4) Take the reading on the display.

N

OTE

W

hen current flows from the upside to the
underside of the instrument, the polarity of the
reading is positive (+). Othewise, the polarity of
t

he reading is negative (-).

6. VOLTAGE MEASUREMENT
DANGER

• Never use the instrument on a circuit with a
v

oltage higher than 600 VAC/DC. Otherwise,

e

lectric shock hazard or damage to the

i

nstrument or the circuit under test may result.

• Do not make measurement with the battery
c

ompartment cover removed.

6-1 AC Voltage Measurement

(

1)Set the function selector switch to the “ACV”

p

osition

(

2)Plug the red test lead into the V/Ω terminal

and the black test lead into the COM terminal.

(3) Connect the test lead prods to the circuit under

t

est and take the reading on the display.

6-2 DC Voltage Measurement

(

1)Set the function selector switch to the “DCV”

p

osition

(2) Plug the red test lead into the V/Ω terminal

and the black test lead into the COM terminal.

(

3)Connect the test lead prods to the circuit under

t

est and take the reading on the display.

7. RESISTANCE MEASUREMENT
D

ANGER

•

Always make sure that the circuit under test
is powered off.

• Do not make measurement with the battery
c

ompartment cover removed.

(

1)Set the function selector switch to the Ω/

)))

p

osition

(

2)Plug the red test lead into the V/Ω terminal
a

nd the black test lead into the COM terminal.

(3)Check that the display reads “OL.” with the test

lead prods shorted together, also check that the
b

uzzer beeps and the display reads “0.”

(

4)Connect the test lead prods to the circuit under

t

est and take the reading on the display. The

b

uzzer beeps the reading is below 50±35Ω.

NOTE

• When shorting the test lead prods together, the
d

isplay may show a very small resistance instead

o

f “0.” This is the resistance of the test leads.

•

If one of the test leads has an open, the display
r

eads “OL.”

8. OTHER FUNCTIONS
8-1 Sleep Function

N

OTE

T

he instrument still consumes small amount of

b

attery power in the sleep mode. Make sure to

s

et the function selector switch to the “OFF”

position after use.

(

1)Sleep Mode

T

his is a function to prevent the instrument from

b

eing left powered on in order to conserve bat

t

ery life. This function causes the instrument to

a

utomatically enter the sleep (powered down)
mode about 10 minutes after the last switch or
button operation.
To exit the sleep mode, turn the function selec
t

or switch back to “OFF”, then to any other posi

t

ion, or press any button.

(

2) How to disable the sleep mode

T

o disable the sleep mode, Power the instru
ment on with the data hold switch pressed.
“P.OFF” is shown on the display for about 3
seconds after the instrument is powered on.
To enable the sleep mode, power the instru
m

ent off, then power it on without pressing the

d

ata hold switch.

8

-2 Data Hold Function

T

his is a function used to freeze the measured
value on the display. Press the data hold switch
to freeze the reading. The reading will be held
regardless of subsequent changes in input. “H”
is shown on the upper left corner of the display
w

hile the instrument is in the data hold mode.

Fig. 2

F

ig. 3

I

ncorrect

C

orrect

!

!

To exit the data hold mode, press the data hold
switch again.

NOTE

• If the instrument in the data hold mode enters
the sleep mode, the data hold mode will be
cancelled.

• At DC 40A range, if the data hold switch is
pressed for more than 2 seconds, 0 ADJ.
Function operates.

9. BATTERY REPLACEMENT
WARNING

To avoid electric shock hazard, make sure to set
the function selector switch to “OFF” and remove
the test leads from the instrument before trying to
replace the batteries.

CAUTION

• Do not mix new and old batteries

• Make sure to install battery in correct polarity
as indicated inside the battery compartment.

When “BAT” is shown on the display, replace
the batteries. Note that when the battery is
completely exhausted, the display blanks
without “BAT” shown.

(1)Set the function selector switch to the “OFF”

position.

(2) Unscrew and remove the battery compartment

on the bottom of the instrument.

(3)Replace the batteries observing correct polarity.

Use two new R03 or equivalent batteries.

(4)Mount and screw the battery compartment

cover.

Byram Laboratories, Inc

1 Columbia Road, Branchburg, NJ 08876

1-800-766-1212 or 908-252-0852

Fax: [phone]

E Mail: [e-mail]

http://www.byramlabs.com

!

!

LIFETIME LIMITED WARRANTY

The attention to detail of this fine snap-around
instrument is further enhanced by the application of
A.W. Sperry’s unmatched service and concern for
detail and reliability. These A.W. Sperry’s snap­arounds are internationally accepted by craftsmen
and servicemen for their unmatched performance.
All A.W. Sperry’s snap-around instruments are
unconditionally warranted against defects in material
and workmanship under normal conditions of
use and service; our obligations under this warranty
being limited to repairing or replacing, free of
charge, at A.W. Sperry’s sole option, any such
A.W. Sperry snap-around instrument that malfunc-
tions under normal operating conditions at
rated use 1.

REPLACEMENT PROCEDURE

Securely wrap the instrument and its accessories in
a box or mailing bag and ship prepaid to the
address below. Be sure to include your name and
address, as well as the name of the distributor, with
a copy of your invoice from whom the unit was pur-
chased, clearly identifying the model number and
the date of purchase.

A.W. SPERRY INSTRUMENT INC.

ATTN: Customer Service Dept.

245 Marcus Boulevard

Hauppauge, N.Y. 11788-2075

1. Warranty is not applicable if the instrument has
been: misused, abused, subjected to loads in
excess of specifications, has had unauthorized
repair or has been improperly assembled or
used.

*Note: Recommended calibration interval should not

exceed one year. Calibration service charges are
not covered under terms and conditions of
warranty .