Hung Chang HC-5050E User manual

@S HUNG CUM
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SAFETY RULES
Waming
This tester has been designed with safety in mind. However,
no design tan completely protect against incorrect use. Electrical
circuits tan be dangerous and/or lethal when lack of caution or .
poor safety practices are used.
Read The Manual
Read this Instruction Manual carefully and completely.
.
Voltages and currents within the capability of this test equip-
ment tan be hazardous. Follow the instructions in this manual for
every measurement. Read and understand the general instructions
before attempting to use this tester. D
O not exceed the limits of
the tester.
Safety Check
Double check the switch setting, and lead connections before
making measurements. Are you
folIowing all of the instructions?
Disconnect the tester or turn off Ce power before changing
switch positions.
D
O not connect to circuits with voltage present when switch is
in any ohms or current Position.
. When replacing fuses,use only specified type fuses and insert in
correct fuse holder.
Don’t Touch
Don’t tauch exposed wiring, connections or other “live” Parts
‘of an electrical circuit, If in doubt, check the circuit first for
voltage before touching it.
Turn off the power to a circuit before connecting test probes
to it. Be sure there is no voltage present before you
tauch the
circuit.
D
O not use cracked or broken test leads.
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High Voltage 1s Dangerous
Always Start with the power off. Be sure there is no volt@e f%\:
present before making connections to the circuit.
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Don’t tauch the tester, its test leads, or any part of the circu\\* ,:i’
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while it is switched on.
*
Distribution Circuits Pack A Punch
.In high energy circuits such as distribution transformers and
bus bars, dangerous arcs of explosive nature tan occur if the 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 impedance range, the circuit is virtually shorted.
Special equipment designed ‘for use with these circuits is avail-
able. Contact a qualified person for assistance before attempting
to make measurements on any high energy circuit.
SAFETY IS NO ACCIDENT
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SECTION 1
Introduction & Specification
FIG. l-l. Controls, Indicators and Connectors
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Table l-l. Controls, Indicator and Connector
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E-1.
Power-On-Off switch: A slide switch used to turn the ins&ii~;~~-i
:
ment off or on.
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Working sign lamp: The lamp will glow, indicating that 9;Vi’:‘:G
f
BAT in this instrument is applied and in good condition.
If not glow, the 9V BAT should be Change as soon as
possible.
g-
Polarity reverse switch: A slide switch used to Change DC
polarity instead if the input Signal reversing.
(3 -1, 2, 3, 4. Input Sockets (Compiled to UL1244, VDE 0411) :
DC Center Zero ADJ: When pointer is exactly on zero at
Center of meter on the * DC V*A scale line, this instru-
ment will be used in Galvano meter type.
@. Inner core type moving coil movement :
High sensitive movement Systems are patented.
4 Inputs sockets are recessed and protected against
accidental contacts.
Test Leads (Compiled to UL 1244, VDE 0411): The test
leads supplied with the equipment give added safety to .
the user since the jacks are shrouded , thus avoiding
dangerous connections to eventual high voltages. The
prods supplied have guard rings to keep fingers away
from the naked end.
Range Selector Knob: The Single knob ranges switch has 24
positions. It may be turned in either direction to obtain
any desired range and circuit Position.
“0” fi ADJ: Every time, adjust the “0” ohm ADJ to see
that the pointer indicates Zero when the meter is in each
OHM range.
Meter Mehanical Zero ADJ: If the meter pointer does not
indicate zero after the instrument’s power has been off,
rotate zero adjustment screw until pointer is exactly on
zero on the left side of dial.
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PAT. No KOREA 9546
USA 4139821
FRANCE 7709426
W/GERMANY 7709878
JAPAN 1063542
TAIWAN 11114
@,, Meter Dia1 :
41/2” Mirrored real 90” arc, w/knife edge pointer, enables
easy reading & more accuracy.
@. ‘Case : High impact shock-resistant
case.
ci_oi, Tilt stand :
For Bench-Top using & Slip preventing rubber feet.
SPECIFICATIONS
Dc Volts
Ranges
.
.
Input Impedance:
Rated Accuracy :
AC Volts
Ranges
.
Input Impedance:
Rated Accuracy :
dB
.
.
.DC Currents
0-0.3, 1.2,12,30,120, 300, 1200v
0- 2 1.5, 0.6, 6, 15, 60, 150, 600V at Center 0.
Approx lOMG!, 3Ms2 at 30OmV range.
With 2 2.5% DC and ?3.5%AC of full scale on
all ranges.
RMS o-3, 12, 30, 120, 300, 1200v
Peak-peak, 0-8.4, 33, 84, 330, 840, 3300
RMS 1200V (peak to peak 33OO.V) on separate jack.
Approx lMs2 80 pF, 2.5Ma it 3 V Range
30Hz - 1 MHz + 3.5% at sine wave
at 3V range only
30Hz - 5 KH Z + 3.5% at sine wave
at 12V - 300V Range.
30Hz - 500Hz f 5% at sine wave. 1200V Range
-1OdB - + 63 dB at AC Ranges.
Ranges: O-O.lpA, 0.3, 3, 30, 300mA, 12A
potential Drop: 300mV
Rated Accuracy: Within + 2.5% full scale, all ranges.
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AC Currents
Ranges: O-12A, within + 3.5% full scale. DC, AC 12 Amp range o$..,;: ,:.’
Separate jack.
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DC Resistance
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Ranges : RX 1
0-1Ka (Center 10)
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Rx 10
.
0-lOKs2 (Center 100 R)
Rx 100
O-lOOKs2 (Center lKs2)
Rx 1K
O-1M n (Center 10Ka)
Rx 10K
,
RX 1M
O-10M 52 (Center 100K~2)
O-lOOOMJZ(center 10Mn)
Accuracy : “2.5” Arc
1:ront Panel controls: Range slector switch, power on-off switch,
w/working sign lamp, polarity reverse switch, “0”
OHM ADJ, Center “0” ADJ.
Movement: jewelled-Pivots-90” ARC, 44 MA F.S.
Dia1 ARC: One Arc for OHMS, one arc for DC V.A.
9 arces : One Arc for AC rms, 2 Arc for AC peak-peak,
One Arc for +DC V.A (Center Null)
One Arc for AC 12A
One Arc for DC O.lpA, one Arc for dB.
Scale length : 4%”
Lead reversal: Polarity Reverse Switch: on DC and OHMS ranges
Operating Position: Horizontal or Vertical, rubber feet to prevent
slipping on moderate slopes.
Batteries :
2 x ISV A.A pencil and 9V battery.
Movement & Indicator Protcction: Double F’.E.T. protection & ’ ‘,
Fuse. (2A/25OW.
.
Operating Temperature Range: 25°C (75” F) rated accuracy: less than
j
4% additional error over the range of -4°C (25°F) to
,
50°C (130” F)
Size :
125M/M (5”) wx 170 (6%“)L x 50 (2”)D 48Og (17
ounces).
Construction: Combination high impact
plastic case & phenolic: PC
Board.
Color : Black with white scale.
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SECTION 11
OPERATING INSTRUCTIONS
CAUTION
Be extremely careful when working in high voltage circuits.
Even though meter and. test leads are well insulated, it is not
.
advisable to handle the instrument or leads while power is on in
the circuit being measured.
1.
2.
3.
4.
t
NOTE
If the value of the voltage or current to be measured is
unknown, always Start with the highest range to avoid
overloading the tester. The Range. Selector Switch should
not be rotated while under load.
The life and reliability of the tester will be greatly increased
if test leads are removed from the circuit before changing
ranges.
Before making any measurements, check to see that working
sign lamp’s flashing when the power switch is in the on
Position.
Before making any measurements, check to see that the
pointer indicates zero when the power switch is in the
“Off” Position. If the pointer is off Zero, make the reguired
correction by turning the screw of the mechanical zero ADJ.
When the power switch is in the “On” Position, if the pointer
is off Zero, rotate DC Center zero ADJ untill pointer is at
zero on the left edge of dial.
.
Measuring DC Voltages 0.3 through 1200 Volt Range
,
1. Connect the black test lead into the COM-ja& and the red
test lead into the V-in-A jack.
2. Set the range switch for any of the seven DC Volts range posi-
tions desired. When in doubt as to which range to use, always
Start with the highest voltage range as a protection to the
instrument.
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3. Connect the black test lead to the negative side of the circuit
1
to be measured and the red test lead to the positive side of the
1
:
circuit .
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4. Set reversing switch to the .
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+ Position. Turn the power onin ’ :it:;
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the circuit to be, tested. If the pointer deflects to the lefthf., J.
Zero, the actual circuit polarity is the reverse of that anticipatedi”i”’
,
;
In this case, turn off power in the circuit to be tested, set the
reversing switch to the
- Position and turn power on again.
5. Read the voltage on the black arc marked DC which is second
from the top of the dial. If the voltage is within a lower range,
the switch may be set for a lower range to obtain a more
accurate reading.
Measuring AC Voltagep RMS, 3V to 1200 V
(8.4V w 3300 v, P-P)
1. Connect the black test lead into the COM-jack and the red
test leads into the V~Z=A jack.
2. Set the range switch for any of the five AC V range positions
desired. When in doubt as to which range ‘to use,always Start
with the highest voltage range as a protection to the instrument.
3. Turn power on in the circuit to be tested. Read the voltage on
the black arc marked AC V( RMS) on the red arc marked AC V
( P-P>
Measuring AC Voltages, 120OVolt Range Only
CAUTION
Be extremely careful when working in high voltage circuits.
Even though the METER and test leads are well insulated for this
’
:
voltage, it is not advisable to handle either when power is on in
;
the circuit .
1. Set the range switch at 1.200 VAC (the Same switch Position as
for the 300 VAC range).
2. Turn off power in the circuit being measured.
3. Connect the black test lead in the COM-jack, and the red test
lead in the 1200 VAC jack.
4. Turn on power in the circuit being measured.
5. Read the’voltage on the black arc marked AC V(RMS) on
the red arc’ marked AC V(P-Pl.
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Measuring Decibels
For some applications, power 10% or gain measurements in
terms of DB are required. The DB is defined as:
DB = 10 log ~c)~~~l’ or,
2
El
20 log E when RI = RZ
2
This instrument is calibrated with 0 DB referenced to 1 milli-
watt at 6OOs2. i.e., DB reading corresponds to 20 log E (reading)
0.774v
(E measured across 600~2). The decibel scale at the bottom of the
dial is numbered from -10 through 0 fo + 11 To measure decibels,
proceed according to instructions for AC Voltages, and read the
DB arc. The DB scale is calibrated for direct reading on the 3 V
range. Scale factors for other ranges are given in the table below.
DB Scale Factor (add to Reading)
Range DB reference lmw 600~2
3vdirect
12v
(+U
3ov
t+m
120v
(+32)
3oov
(+40)
1200v
(+5 2)
Measuring Resistances
When DC resistances are measured, the internal batteries furnish
power for the measuring circuit. Correction for battery deteriora-
tion over long periods of time is provided by means of the Zero
Adjust control which is part of the Ohmmeter circuit.
1. Set the range switch at the desired resistance range Position
2. Connect the black test lead in the COM - jack, and the red
test lead in the V$Z-A jack.
3. Connect the contact ends of the test leads together.
.
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4. Observe the instrument indication. It should read “0” on the
OHMS arc. which is at the top of the dial.
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5. If the pointer does not read “O”,
rotate the ZERO OHMS&A~:Y
at the left on the front Panel until it does. If the pointer ca&ot
be brought up to the
“0” mark, the appropriate battery sho$&
be replaced ._
NOTE
Disconnect power from any resistor or circuit to be measured
before measuring resistance. DO not apply any power before
the measurements are completed and the test leads are dis-
amnxted.
6. Connect the test leads across the resistance which is to be
measured. If there is a “forward” and “backward” resistance,
such as with rectifiers and diodes, observe polarity in the lead
connections to control each direction of test. With the reversing
switch in the
- Position, the + jack will provide a positive
potential referred to the COM-jack. Setting the switch to the
- Position will reverse this measuring potential.
7. Read the indication on the OHMS arc at the top of the dial.
Note that the arc reads from right to left for increasing values.
8. Multiply the reading by the multiplier factor indicated at the
switch Position: the result is the resistance value in Ohms. “K”
on the dial Stands for “thousand.”
CAUTION
:
Never connect the test leads directly across any Source of *
voltage when used for current measurements. This will darnage
the instrument.
Measuring Direct Current, All Ranges Except 12A Range
CAUTION
Never connect the test leads directly across any Source c$f
voltage when the instrument is used for current measuremen$.
‘Ibis will darnage, the instrument.
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1.
2.
3.
4.
Connect the black test lead in the COM - jack, and the red
test lead in the V+n l A jack.
Set the range switch for the appropriate milliampere range.
With the circuit power turned off, open the circuit at the Point
where its current is to be measured. Connect the instrument
in series with the circuit, observing proper polarities when
making connection.
Turn on power to the circuit being measured. If the pointer is
deflected to the left of Zero, the polarity is opposite to that
which was anticipated. Set reversing switch to the
- Position
to obtain an up-scale indication.
Measuring the 12Amp Range
1.
2.
3.
Connect the black test lead in the COM-jack, and the red test
lead in the 12A jack.
Set the range switch at appropriate range of’ AC, DC.
With the circuit power turned Off, open the circuit at the Point
where current is to be measured. Connect the instrument in
series with the circuit, observing proper polarities when making
connection.
4.
5.
Turn on power to the circuit being measured. If the pointer
is deflected to the left of Zero, the polarity is opposite to that
anticipated. Turn power off and reverse the leads. The reversing
switch must be kept in the + Position on
this range.
Read the current directly on the biack arc marked at DC 12A
range.
6.
Read on the red arc marked AC 12A, at AC 12A range.
MAINTENANCE
Battery & Fuse Replacement
Two batteries are used for the Ohmmeter circuits, two 1.5 volt
and a 9 Volt.
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When the meter pointer tan no longer be adjusted to”Fer&:’
ohms on the all ohm ranges,replace the 1.5 volt battery.
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To replace batteries & Fuse (2A/25OV),remove the 3 screws’m
:
the bottom of the case. Simply remove the old and replace with
a new battery being careful to observe polarity.
Care
A little precaution in handling and caring for your teste-r tan
pay big dividends in satisfaction. Treat your tester like you would
do a fine watch.
Avoid placing your tester on a bench where machine tools are
used or severe Vibration is encountered.
D O not place near the edge of a shelf or mbench where it tan
easily be knocked off.
When possible, keep your tester in a place of moderate tem-
peratures. Avoid places with extreme temperatures or severe tem-
perature changes
In use, don’t take chances on overloading the meter. If in
doubt as to the approximate reading,always Start with the highest
range.
Get in the habit of double checking the Position of the switch
before making a measurement. The meter tan be burned out by
applying voltage when the switch is set on the current or ohms T
range.
If the unit has not been in use for a long period of time, ’
rotating the switch in both direction several times will wipe the
contacts for good and clean connection .
i
Turn the selector switch to OFF when the unit is to be carried.
The meter is damped in this Position to prevent wild swinging of
the pointer.

SCHEMATIC DIAGRAM
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RB9 IOU
RZ0 IOIK
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7 TRAN9

4+ HUNG CHANG PRODUCTS Ca, LTR
C.P.O. Box 3125
Seoul, Korea
Tel : [02) 732~&3611/20
Tlx : ELECHCP K28447
Fax: [phone]
MADE IN KOREA
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