Triplett 60-A User manual

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-------- MODEL
t 60-A
VOLT-OHM-MI
LLIAMMETER

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SAFETY
RULES
WARNING
This
tester
has
been
designed
with
your
safety
in
mind
.
However
,
no
design
can
completely
protect
against
incorrect
use
.
Ele
ctrical
circuits
can
be
dan
-
gerous
and/
or
lethal
when
lack
of
caution
or
poor
sa
fety
practices
are
used
.
READ
THE
MANUAL
Read
this
Instruction
Manual
carefully
and
comple
te-
ly.
Voltages
and
currents
within
the
capab
ility
of
this
test
equipment
can
be
hazardous
.
Fo
llow
the
instruc
-
tions
in
this
manual
for
every
measurement
.
Read
and
understand
the
general
instru
ctions
before
attempting
to
use
th
is
tester
.
Do
not
exceed
the
limits
of
the
tester
.
SAFETY
CHECK
Double
check
th
e
switch
setting
and
lead
connections
before
making
measurements.
Are
you
following
all
of
the
instructions?
Disconnect
the
tester
or
Lurn
off
the
power
before
changing
switch
positions
.
Do
not
connect
to
circuits
with
voltage
present
when
switch
is
in
a
ny
ohms
or
current
position
.
When
replacing
fuses
use
only
specified
type
fuses
and
insert
in
correct
fuse
holder
.
DON'T
TOUCH
Don't
touch
exposed
wiring,
connections
or
other
"live"
parts
of
an
electrical
circuit.
If
in
doubt,
check
the
ci
r
cuit
first
for
voltage
before
touching
it
.
Turn
off
the
power
to
a
circui
t
before
co
nn
ecting
test

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probes
to
it
.
Be
sure
there
1s
no
voltage
present
before
you
touch
the
circuit
.
Do
not
use
cracked
or
broken
test
leads.
HIGH
VOLTAGE
IS
DANGEROUS
Always
start
with
the
power
off.
Be
sure
there
is
no
voltage
present
before
making
connections
to
lhe
circuit.
Don't
touch
the
tester
,
its
test
leads,
or
any
part
of
the
circuit
while
it
is
on
.
Before
disconnecting
the
tester,
turn
the
circuit
off
and
wait
for
the
meter
to
return
to
"zero
. "
DISTRIBUTION
CIRCUITS
PACK
A
PUNCH
In
high
energy
circuits
such
as
distribution
trans
-
formers
and
bus
bars
,
dangerous
arcs
of
explosive
na
-
ture
can
occur
if
tbe
circuit
is
shorted.
If
the
tester
is
connected
across
a
high
energy
circuit
when
set
to
a
low
resistance
range,
a
current
range
,
or
any
other
low
im-
pedance
range
,
the
circuit
is
virtually
shorted.
Special
equipment
designed
for
use
with
these
cir
-
cuits
is
available.
Contact
a
qualified
person
for
assist-
ance
before
attempting
to
make
measurements
on
any
high
energy
circuit.
SAFETY
IS
NO
ACCIDENT
2

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TABLE OF CONTENTS
Page No.
Specifications 4
Description 6
General Instructions 8
Measuring Resistance 12
Measuri 11g DC Volts 14
Measuring AC Volts 16
Measuring Output Voltage 16
Measuring DC Current 18
Measuring AC Current With Model 10 Adapter 20
Measuring Decibels ( dB ) 22
Confidence - Test 23
Calibration 24
Maintenance 26
Accessories 29
Replaceable Parts List 32
Parts Location (Circuit Board) 34
Schematic ( Fold Out) 35
Warranty 36
Printed in U.S . A.
3
Part No . 84-278B

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SPECIFICATIONS
RANGES:
DC VOLTAGE
0-0. 3 volts at approximately 10 ,0 00 ohms/vol t
(see page 14 for instructions).
0 - 1, 3, 10, 30 , 100, 300 , 1000 volts at approxi-
mately 20,000 ohms/volt .
AC VOLTAGE
0 - 3, 10, 30 , 100, 300 , 1000 volts at approxi-
mately 5,000 ohms/volt .
DC CURRENT
0-0 . 1, 10 , 100 , 1000 milliamperes at approxi -
mately 320 millivolts .
RESISTANCE
0-lk , 10k, 100k, 1 Meg , 10 Meg
(12, 1 20 , l. 2k , 12k, 120k ohms center scale).
DECIBELS
- 20 dB to + 62 dB.
AC CURRENT RANGES WITH MODEL IO ADAPTER
6, 12 , 30 , 60, 12 0, 300 AC Amps
OHMMETER SPECIFICATIONS
Range
Voltage - Volts
Current - mA
Power Trans.fer
To Load - mW
(Max)
Xl
1. 7
142
60 . 4
Maximum Values
XIO XIOO Xlk
l.7 l.7 l.7
14 . 2 l.42 0.14
6.04
. 60
0.06
4
XlOk
10.2
0.09
0.22

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SPECIFICATIONS (cont'd.)
ACCURACY (Calibrate d at 77° F):
DC Voltage ± l l / 2% of full scale value
DC Current ±1 1/2% of full scale value
AC Voltage ± 3% of full scale value
Resistance ± l l /2% of arc length
METER:
Suspension type mirrored scale. Separate housing for
easy replacement.
TEST LEADS:
One red and one black test lead supplied, each 48
inches long.
CARRYING HANDLE:
Position indent provides inclined tester stand.
OVERLOAD PROTECTION:
Meter movement protected by a diode module.
1/8 Amp/250V Fuse (Littelfuse 362 . 125 8AG).
1 Amp/ 250V Fuse (Bu ssmann ABC-1 or Littel-
fuse 314001 3AB).
2 Amp/ I000V Fuse is located inside tester. Re-
place with Bussmann HVA-2 or Littelfuse 621002 .
BATTERIES:
One 1. 5 Volt "D" cell (NEDA l 3F).
One 9 Volt "transis tor " battery (NEDA 1604).
WEIGHT:
Approximately 2 1/2 pounds.
SIZE:
Approx imately 3 1/4" x 5 1/4 " x 7 1/4".
5

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DESCRIPTION
The Triplett Model 60 - A Volt - Ohm - Milliammeter
(VOM) is a multi - range instrument for general electrical
and electronic trouble shooting and · measurement. It has
been especially designed to satisfy the need for a preci-
sion instrument which can stand up under rigorous hard
usa g e of the industrial and maintenance environment and
at the same time provide a degree of safety in its use
heretofore unavailable with an instrument of this kind.
Maintenance is simplified by designing an independent
meter module for quick replacement or service and easy
to follow parts layout.
X'TRA RUGGED: Unique design and selection of materi-
als permits the in strument to withstand the normal acci -
dents of dropping and rough handling which occur in hard
day to day use. The Model 60 - A is warranted to with -
stand an accidental drop up to a five foot height with de -
viation from its stated accuracy not exceeding ± 4%. The
warranty does not include mechanical parts being defaced
( scratched , etc. ) from a drop or normal usage .
OVERLOAD PROTECTED: The instrument has been en-
gineered for significant reduction in the need for ma i nte -
nance by virtual elimination of parts burn out (other than
fuses ), and parts damage from severe mechanical abuse.
Three fuses are employed for unusual protection to the
instrument and safety for the user . The 1/ 8 Amp and 1
Amp instrument fuses are used for normal overload con -
ditions . Spares for each are included in the inst ru ment .
Protection is provided for high energy fault cur r ents be -
yond the capabilities of the instrument fuses up to the ca -
pacity of the 2 Amp/ 1000V ( 20 kW) fuse.
SAFETY DESIGNED: Unusual effort has gone into the in-
strument 1s design to provide the greatest possible safety
to the user .
6

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DESCRIPTION ( cont
1
d.)
The Model 60 - A provides a specially engineered inter-
nal electrical system to prevent explosive arcs in high
energy circuits up to the 2 Amp/ 1000V (20 kW ) fuse ca-
pacity . Complete 10sulation of the instrument itself plus
a new type test lead are additional safety features .
CONFIDENCE - T E ST: A feature built into the instrument
for periodic reassurance checks of its meter . While not
intended as a comprehensive test of the ins tr ument it does
perm it a high level of confidence IO the instrument meter
if the pointer indicates within the area of the test symbol.
Ranges l1ave been designed to cover nearly all applica-
tions with the added convenience of signal level measure -
ments in decibel decade steps .
The carrying handle can be rotated to provide a st a nd
for placing the ins t rument at a viewing angle of app r oxi -
mately 30 degrees .
A
sepa r a t ely sealed ba t te r y compartment permits ac-
cess to batteries and fuses without removal of the rema in-
der of the instrument . In addition, battery aci.ds are
sealed off to prevent damage to components .
7

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GENERAL INSTRUCTIONS
INSTALL BATTERIES:
•
1. Loosen captive
screw.
, 2. Slide cover off.
' 3. Install batteries .
4. Replace cover.
ADJUST POINTER TO ZERO:
With unit in operating posit ion
use a screwdriver to adjust
pointer for a zero indication.
While keeping the pointer on
zero , reverse the rotation of
the screw slightly to disengage
it. This will reduce the affect
of pointer shift under shock.
8

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GEN
E
RAL
INSTRUCTIONS
{cont'd.)
START
WITH
HIGHEST
RANGE
When
the
approximate
value
of
the
voltage
or
cur
r
ent
being
measured
is
11ot
known,
always
start
with
the
high-
est
range
to
avoid
overload
and
blowing
a
fuse
.
RANGE
CHOIC
E
For
greatest
accuracy
choose
the
range
which
allows
readings
to
be
made
in
the
upper
(right
hand
)
portion
of
the
scale
.
Accuracies
are
rated
as
percent
of
full
scale
so
the
closer
to
full
scale
the
better
the
accuracy
.
DO
NOT
CHANGE
SWITCHES
UNDER
LOAD
Quality
switches
are
used
but
any
switch
will
arc
if
changed
while
under
load
.
Disconnec
t
the.
test
probes
or
shut
off
the
circuit
under
test
before
the
range
switch
or
polarity
switch
positions
are
changed
.
This
practice
will
result
in
increased
life
and
reliability
of
the
instrument
.
MEASUREMENT
ERRORS
Readings
on
the
£ensitive
ranges
may
some
ti
mes
be
different
than
expected
due
to
thermoelectric
or
electro-
chem
i
cal
effec
t s .
Readings
on
the
high
resistance
ranges
can
be
affect-
ed
by
touching
the
circuit
causing
the
body
t o
act
as
a
shunting
resistor.
Consideration
should
be
given
to
the
loading
affect
of
the
instrument
when
measuring
vo
l
tages
from
sources
of
high
impedance
.
9

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GENERAL INSTRUCTIONS ( co nt' d .)
SWITCH CONTACTS
It is good practice when an instrument has not been
used for a long period of time, to operate both switches
several times to wipe the contacts and assure ' accurate
measurements .
USE OF CONTROLS
Pointer
Scales - See page 1 1.
Mirror
Ohms Adjust Control
- sets full scale (0
ohms ) indi cation on
ohms ranges with
test leads sho r ted .
Range Sw it ch - se -
lects measurement
range - should be
placed in OFF posi -
tion when unit is not
in use for best meter
protection ,
P
anel Ja cks - plug
black test lead into
"CO M - " jack and red
test lead int o
" V- 0- mA " Jack.
Polarity Switch - when in the + posi ti on a positive
voltage applied to the " V- 0- mA" jack will cause an up -
scale pointer deflection a nd on the ol1ms ranges the
"V -0- mA " jack will be positive . When in the
11
- "posi -
tion th e polarity is revers ed .
10

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GENERAL
INSTRUCTIONS
(cont'd
. )
USE
OF
SCALES
,]
:;,
,
~
0
~
~~-
~
0~
Range
Switch
Posi
t
ion
l000DCV
300DCV
l00DCV
30DCV
l0DCV
3DCV
lDCV
.
lDCmA
.
lDCmA
lODCmA
l0ODCmA
~
~
.
.,.
c,""tr.,
~
'\/
ABCDEF
SCALES
Readin
g
Read
For
Above
Scale
Indication
B
600VDC
C
190VDC
B
60VDC
C
l9VDC
B
6VDC
C
l.
9VDC
B
.6VDC
C .
19VDC
B .
06mADC
B
6mADC
B
60mADC
Range
Switch
Read
Position
Scale
XlOk
A
Xlk
A
XlOO A
Xl0
A
XI
A
3ACV
D
3ACV
E
JOACV
B
lOACV
E
30ACV
C
30ACV
E
l000DCmA
B
600mADC
lOOACV
B
I00ACV
£
300AC
V C
O
ut
Of
300
ACV
E
Test
F
Tolerance
lO0OACV
B
11
Reading
For
Above
Indication
80k.Q
8kO
soo
n
so
n
an
1.
85VAC
7.
7dB
6VAC
I
7.
7dB
19VAC
27
.
7dB
60VAC
37
.
7dB
190VAC
47
.
7dB
600VAC

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MEASURING RESISTANCE
0 TO 10 MEGOHMS (XI THRU XlOk):
1. Set range se l ector sw it ch to desired (0) range.
2. Plug the test leads into the jacks. Short test prods
and adjust the " 0" control to set the pointer over
the right (0 ohms) end of the i-ed "0" scale.
3 . Turn off all power to the circuit to be measured
and/ or disconnect one end of component being
checked . Connect test leads across the circuit
or part, OBSERVE ALL SAFETY PRECAUTIONS.
4. Read resistance on the "0 " scale. Multiply the
indication by the rar1ge multiplier (e.g. - multi-
ply by 10 on the XlO range , 10 , 000 on tne l Ok
range ).
CONTINUITY TESTING:
Use the Xlk resistance range . The lower battery
drain will g ive longer battery life.
CAUTION:
So me semiconductor devices can be damaged by the
voltage and current available in the ohmmeter circuit .
Compare ratings of semiconductor devices and ohmmeter
specifications ( page 4 ) before making measurements .
POLARITY SWITCH:
Tne polarity switch reverses the polarity of the ja cks .
This featu re can ' be used for checking semiconductors.
The V-0-mA jack is connected to the positive battery ter-
minal with the polarity switch in the
11
+
11
position.
12

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CA1.mow:oesu1 '"' """'-u .n
IOOOOFFIOOO ~
!00 JOO y
~ 100 100 • <",
0 JO ,0
10 10
3 •
I • •
I ol
t ,di(
00 11: IIOK
'
• C
Measuring Resistance
13
READ ON fi SCALE
DISCONNECT POWERI

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MEASURING DC VOLTS
0 - 1 THRU 0-1000 DC VO L TS:
l. Se l ect t h.e desired DC voltage (DCV) range
with the range selector switch .
2.
Check the setting of the polarity swLtch for
proper polarity.
3. Plug the test leads into the jacks .
4. Connect the test leads across the circuit
to be measured . OBSERV E ALL SAFETY
PRECAUT I ONS.
5. Read DC voltage on the appropriate black
11
AC-DC" scale .
0-0. 3 DC VOLTS:
l. Set the range selector switch to 0. l DCmA.
This is also 0 - 0. 3 DC Volts .
2. Check the setting of the polarity switch for
proper polarity.
3. Plug the test leads into the jacks .
4. Connect the test leads across the circuit to
be measured. OBSERVE ALL SAFETY
PRECAUTIONS .
5. Read DC voltage on the black 0-30 "AC - DC"
scale . Divide the indication by 100.
14

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READ ON AC-DC SCALE
-vcc
Measuring DC Volts
15

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MEASURING AC VOLTS
0-3 THRU 0 -1 000 AC VOLTS:
l. Select the desired AC voltage (ACV) range with
the range selector switch.
2. Plug the te st leads into the jacks.
3 . Connect the test leads across the circuit to be mea-
sured . OBSERVE ALL SAFETY PRECAUTIONS .
4 .
Read AC voltage on the appropriate scale . For 30
and 300 volts, use the black 0 - 30 "A C-DC" scale.
For 10, 100 and 10 00 volts , use the black 0- IO "AC -
DC" scale. For 3 volts use the special red 0 - 30
AC Amp scale and drop a zero .
MEASUR I NG OUTPUT VOLTAGE
If there is a DC component to the voltage to be mea -
su r ed and only the value of the AC component is desired,
a capacito r rnay be placed in series wit h the test lead to
block the DC voltage . The remaining AC v oltage is
known as "o utput voltage .
11
For gene r al audio f r equency measurements , use a
.
22 uF capac it or . For low frequency measurements or
!o r measureme nt s on the 3 A C volt range , use a l. 0 µ.F
or larger capaci t or . Capacitor working voltage should be
higher than the sum of DC voltage and peak va lue of the
AC voltage . In gene ral a 600 volt capacitor is sufficient .
0 - 3 THRU 0 - 300 AC VOLTS:
1. Connect a capacitor to the point in tl1e circuit to be
measured . See note above for value and vo lt rating.
Z. Same as steps l thru 4 for AC VOLTS ( above ).
16

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REA.0 ON AC-DC OR3 VAC SCALES
Measur in g AC Volts
"'
-~
.. ~_1... ... .~ 6
:,fr' if.)
',.,, .
• .1:..-'
•.· . ~
tA..mcJal: ~Y( '4n :n MAU l'L
,o:,ooo°'', o~oo ~
o,:} ~ r-"-~
>O '°
,o 10
' .
I df{I
iOO
~l · "'"-- M
RE.AD ON AC- DC OR 3 V-.C SC A LES
- vcc
Measuring Output Voltage
17

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MEASURING DC CURRENT
0-0 . 1 THRU 0 - 1000 DC MIL L IAMPERES:
1. Select the desired DC current
(DCmA ) range with the range
selector sw i tch .
2.
Check the set t ing of the polar i ty
switch for proper polarity .
3 .
Plug t he test leads into the jacks .
4. Connect the test leads in se r ies
wi t h the circuit to be measured .
OBSERVE ALL SAFETY PR E CAU -
TIONS .
5.
Read DC current on the black 0 -1 0
"AC - DC " scale.
18

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A
C-DC SCALE
READ ON
. g DC Current
Measur a1
19