B+K precision 1635 User manual

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Instra

1635
DCPOWER
SUPPLY
WithLEDDisplay
trIYNASCAN
COF|POF|ATION
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TEST INSTRUMENT SAFETY
Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must
sometimes be performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass
through the heart will stop most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous
and hazardous siace it can produce a lethal current under certain conditions. Higher voltage poses ar even greater threat
because such voltage can more easily produce a lethal curent. Your normal work habits should include all accepted prac-
tices that will prevent contact with exposed high voltage, and that will steer current away from your heart in case of
accidental contact with a high voltage. You will significantly reduce the risk factor if you know and observe the followino
safety precautions:
1. There is little danger of electrical shock from the dc output of thispower supply. However, there are several other
possible test conditions using this power supply that can create a high voltage shock hazard:
a. If the equipment under test is the "hot chassisn type, a serious shock hazard exists uniess the equipment is un-
plugged (just turning off the equipment does not remove the hazard), or the precautions of step 8 a:e observed.
b. If the equipment under test is "powered up" (and that equipment uses high voltage in aay of its circuits), the
power supply outputs may be floated to the potential at the point of connection. Remember that high voltage
may appea-r at unexpected points in defective equipment. Do not float the power supply output to more than
500 volts peak with respect to chassis or earth ground,
c. If the equipment under test is "off" (and that equipment uses high voltage in any of its circuits under normal
operation), discharge high-voltage capacitors before making connections or tests. Some circuits retain high
voltage long after the equipment is tr:rned of f.
Z. Use only a polarized 3-wire ac outlet. This assures that the power supply chassis, case, and ground terminal are
connected to a good earth ground and reduces danger from electrical shock.
(continued on inside back cover)
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Instruction
Manual
for
Model
1635
DCPOWER
SUPPLY
WithLEDDisplay
trlYNASCAN
COF|POF|ATIC)N
6460
West
CortlandStreet
Chicaso,
Illinois
60635
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TABLE OF CONTENTS
Page
TESTINSTRUMENT SAFETY..... insidefront cover
INTRODUCTTON.... ......1
FEATURES. .......2
SPECIFICATIONS.. ...... .3
CONTROLSAND INDICATORS . ..... .....5
OPERATINGINSTRUCTIONS.
... ........ .?
SafetyPrecautions
.. ...........?
EquipmentPrecautions. .........7
Hook-Up ........7
TypicalConstant
VoltageOperation ...........10
Setting
Cunent
Limit.. ........12
TypicalConstantCurrentOperation ...........12
Constant Voltage/Constant Curent Characteristic .....13
Using The External Voltmeter Function ........14
Page
APPLICATIONS.... ......1?
General ........1?
ElectronicsServicing ..........17
ElectronicsManufacturing...... .......17
ElectronicsDesignLab... ......18
ElectronicsEducation. .,..,....18
Battery Charging. ......18
MAINTENANCE... ......I9
FuseReplacement.. ...........f 9
Line
Voltage
Conversion .......19
Adjustments ...........19
Instrument
RepairService..... ........22
WARRANTY SERVICEINSTRUCTTONS
.... ..,...23
LIMITED ONE-YEAR WARRANTY .......24
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INTRODUCTION
The B & K-hecision Model 1635 DC Power Supply is a
high quality, general purpose dc power source. It provides
0-30 volts dc output, adjustable with both coarse and fine vol-
tage controls for precise settabiiity. The current output is
0-3 amps. A three station pushbutton assembly allows the
Iarge panel-mounted LED meter dispiay to monitors either
the output current, output voltage, or a voltage (up to 199.9
volts) applied to the external metering inputs. LED's indicate
voltage or current metering.
The Model 1635 exhibits excellent regulation ard low
ripple characteristics. The circuit design incorporates a pre-
regulator, which greatly reduces internal power dissipation at
low output voltages. The styling is both attractive and func-
tional. The mechanical configuration conserves bench space
and allows for easy portability.
This instrument may be used in constant voltage or
constant current applications. The crossover from constant
voltage to constant current modes is smooth arld automatic.
LED's indicate the nCV" (constant voltage) or nCCn (constant
current) mode of operation. In constant voltage applications,
a current limit may be preset. When load variations cause
the current to reach the preset limit. the unit then resulates
output current rather than output voltage. Current limits a.re
adjustable from 570 to 100% of maximum. In constant cur-
rent applications, the maximum voltage may be preset. When
load variations cause current to drop below the regulated
value, the unit reverts to regulated voltage operation at the
preset value.
Reverse polarity protection prevents accidental damage
to the power supply from improper connection to an external
voltage, and current limiting protects the equipment being
powered, as weli as the power supply.
The output is isolated from chassis and earth ground,
which permits full flexibility of connections. When needed,
ttre (+) or (-) polarity may be strapped to ground, or either
polarity may be floated to an external voltage, Two supplies
may be connected in series as a 0-to-60 volt power soulce, or
two supplies may be connected in parallel, with suitable
balancing resistors, for up to twice the output current.
This power supply is well suited for a wide variety of
electrical and eiectronics applications, including service
shops, engineering labs, production testing, school laborator-
ies, and home use by hobbyists.
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FEATURES
(F3O VOLTS LED INDICATORS
Continuously variable over 0-to-30 volt range with coarse Act as pilot light and identify mode of operation and
and fine controls. metering.
(F3 AMPS PRE-REGULATOR
0-to-3 amp current rated for continuous duty at full output Limits internal dissipation for higher reliability.
curent' $OLATED ourPUT
I-ABoRAToRY QUArrrY Either poiarity may be floated or grounded'
Excellent requlation, Iow ripple. OVERLOAD 'ROTECTION
Fully adjustable current limiting (f
rom 5q'o to 1009/oof
CONSTANTVOLTAGEOR CONSTANT CURRENT maximum output current) protects circuit pnder test and
Provides regulated dc voltage output or regulated dc cur- the power supply.
rent output. Crossover is smooth ald automatic. RE\rERSE POLARITY PROTECTION
LED DISpLAy Prevents damage to power supply from erternal voltage of
A large, easy-to-read LED 3-1/Z digit display monitors reverse polarity'
output voltage, output curent, or an external voltage aad STYLING
provides good visiblitty in bright or low light. Meter allows "^:,:
resolution of 0.1 volt or 0.1 amp. Modern functionai styling' configuration conserves bench
space arrrd
aids portability. Logical, convenient layout of
EXTERNAL VoLTMETER FUNCTTON c'ntrols'
Front panel input jacks allow built in meter to be used to HOOK-UP CABLES
measure external DC voltages of up 199.9 volts. Supplied with red and black hook-up leads.
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SPECIFICATIONS
OUTPUTVOLTAGE: 0 to 30 VDC, coarse ard fine Current Ripple: s3 mA typical.
^ l:..^.- ^- .
duJ urrrrrErr Lr
OUTPUT CURRENT: 0 to 3 A.
CONSTANT VOLTAGE OPERAfiON
Voltage Regulation
Line (110-130
V): -0.020^ + 2 mV.
Load (no load to full load): <0.02970+ 3 mV.
METERING
Type:
Functions:
Voltm eter
Ralge:
Accuracy:
Ammeter
Rarge:
Accuracy:
3-1lZ d\eit LED Display
0.5"
high.
Volts,
Amps,ExternalVolts.
0 to 199.9
V.
t(0.5%+2digits).
0 to 19.99
A.
!(O,5%+Zdigits).
Recovery Time:
Ripple Voltage
Peak-to-Peak:
RMS:
<200
tE
typicai.
<Z
mV.
<1 mV.
Temperature Coefficient
(0o
to +35o C): 5 mV/o C typical.
CONSTANT CURRENT OPERATION
Adjustable Current Limits: 5o/oto 700Vo
(0.15 A to 3 A).
Current Regulation
Line (1 10-130
\4: <5 mA typ, 9 mA max.
POWERREQIIIREMENTS: 110/120/220/240
vAC tljTo,
50/60Hz.
POWER
CONSUMPfiON: Approximately 175W or iess
at full load.
Reverse polarity protection,
Current limiting.
Load <5 mA t1p, 9 mA max, PROTECTION:
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SPECIFICATIONS
TEMPERATURE RANGE
Operation:
Storage: 0o to +40o C.
-150
to +70o c.
DruENSIONS
(IIx\f,xD): I7Z x 119x 305mm.
6.75x4.69x12".
WEIGIIT: 11-1/4lb.
ACCESSORIES SUPPI-IED: Hook-Up Leads, 1 red, I black.
Spare Fuse.
Schematic Diagram &
Parts List.
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CONTROLS AND INDICATORS
INDICATORS
Either the uCCu or "CV" and or "A" indicators will
be lit whenever the unit is operating, thus serving as a pilot
light. The unit automatically changes from CV to CC
operation when the preset current limit is reached.
1. C.C. (Constmt Curent) Indicator- Red LED lights in
constant current mode. Unit regulates output current
at value set bl' CURRENT controls.
Z. C.V. (Constant Voltage) Indicator. Green LED lights in
constant voltage mode. Unit regulates output voltage
at value set by VOLTAGE controls.
3. LED Display. 3-1lZ digit display indicates internal vol-
tage, internal current, or dc voltage applied to EXTER-
NAL VOLT METER jacks (depending on which meter
selection srvitch is engaged). External DC voltage up to
199.9 volts can be read on the rlisplay.
4. V (Volt Meter) Indicator. Green LED iights rvhen the
internal or external voltage metering mode is selected.
5. A (Crnrent Meter) Indicator. Green LED liehts when
current metering (A) mode is selected.
VOLTAGE CONTROLS
6. COARSE Control- Coarse adjustment of output voltage"
Read value on LED display when volt meter (\4 fr:nction
is selected,
7. EINE Control. Fine adjustment of output voltage" Read
value on LED display when volt meter (\4 function is
selected.
CURRENT CONTROL
8. CURRENT Coattol. Adjusts current limit in constant
voltage mode. Adjusts constant current value in
constant current rnode. Current can be read from LED
display when curent meter (A) function is selected.
POWER CONTROLS
9. ON-OFF Switch.
OUTPUT TERMINALS
10. r+'Terminal. (Red). Positive polarity output terminal.
11. GND Terminal (Green). Earth and chassis ground.
72. "-" Terminal (Black). Negative polarity output terminal.
METERING SELECTION SWITCHES
13. A Pushbutton. When this switch is engaged, the LED
Display indicates output current.
14. V Pushbutton. When this switch is engaged, the LED
Display indicates the output voltage,
15. EXTERNAL VOLT METER Rrshbutton. When this
switch is engaged, the LED Display indicates the dc
voltage applied to the EXTERNAL VOLT METER Jacks.
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CONTROLS AND INDICATORS
1
't5
14
13
Fig. 1. Front Panel Controls and Indicators.
15. V Jack. Positive input jack for external DC voltmeter
function. Maximum input is 200 VDC.
17. COM Jack. Common (ground) jack for external IJC
voltmeter function. Potential at this jack should not
exceed 100 VDC above ground.
REAR PANEL CONTROLS
18. Fuse.
19. Power Cord-
Fig. 2. Rear Panel.
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OPERATING INSTRUCTIONS
SAFETY PRECAUTIONS
{Jse only a polarized 3-wire ac outlet. This assures that
the power supply chassis, case, and ground terminal are
connected to a good earth ground ard reduces danger from
electrical shock.
There is little dalger of electrical shock from the power
supply output, which produces a maximum of 30 volts dc.
However, therc mey be great danger of electncal shock if the
power supply output is connected.to an extemalhigh wltage.
Some equipment being powered may contain high voltage and
present a shock hazard. Observe caution. If the power supply
output is floated (referenced to a voltage rather than earth
ground) tr:rn off the power supply ond the equipment wlder
test when making connections. Never float the power supply
to a potential greater than 100 volts peak with respect to
earth ground.
EQTIIPMENT PRECAUTIONS
Avoid using the power supply in ambient temperatures
above +40o C, Aiways allow sufficient air space aror:ad the
heat sink at the rear of the power supply for effective radia-
tion to prevent internal heat build-up.
Although the power supply is protected against reverse
polarity damage, the circuit being powered may not include
such protection. Always carefully observe polarity; incorrect
polarity may damage the equipment under test.
Do not exceed the voltage rating of the circuit being
powered. Many transistors and integrated circuits will not
withstand voltage of 30 volts.
There is no need to worry about voltage spikes or over-
shoot damaging the equipment under test. The voltage be-
tween the output terminals of the power supply never exceeds
the preset value as the POWER switch is turned on or off.
EOOK.UP
1. Turn off the power supply and the equipment to be
powered during hook-up.
Z. Connect the positive polarity of the device being pow-
ered to the red (+)terminal of the power supply.
3. Connect the negative polarity of the device being
powered to the black (-) terminal of the power supply.
4. Fig. 3 illustrates the grormding possibilities.
a. If the negative polarity of the equipment or circuit
being powered is also the chassis or common, it
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OPERATING INSTRUCTIONS
DC
POWERSUeerV
te:S-
I
I
- - - ffiiAL votr vriin -'
, ..i, r
!l !l L.l i-lo
:
DO
\
Strap
A.
* Grouncted.
common
wrth
neqal
ve
polaritv
Equr
p
ment
Bernq
Powered
_-_1
,,
B.rfzGrounded.common
u/rtr
p0srlrve
D0anIy.
I
l=.
t=
Hot L-
,i,i
llill
:,',,,,,,:'!
Grounding Possibilities.
8
Fig,3 (A andBl.
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OPERATING INSTRUCTIONS
DC POWERSUPPLY
1635
-
.i EXIEFNAL
VOLTMETEF
ll
fl ,cirr o.
,!
NI !ilTAGL
D.
t Grounded.
nolcommon
with
negatrveor
Positive
Polarit\/
Eourpme
nt
BerngPowered
NoStrap
C.
No
ground
reference
Fig. 3 (C and D). Grounding Possibilities.
9
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OPERATING INSTRUCTIONS
may be grounded to earth by strapping the black
(-) terminal to the green (GND) terminal as shown
in Fig. 3A.
b. Similarly, the positive polarity can be grounded by
strapping the red (+) terminal to the green (GND)
terminal as shown in Fig. 3B.
c. If an earth ground reference is not required, the
configuration of Fig. 3C may be used. The scheme
in Fig. 3C should also be used where it is not
known whether the chassis is common with either
the positive or negative polarity.
d. If the chassis or common of the equipment being
powered is separate from both the positive and
negative polarity power inputs, use the connection
shown in Fig. 3D.
Observe proper polarity. If the circuit being powered is
not equipped with reverse polarity protection, damage
to the circuit can result from reverse polarity. Use
color coded hook-up leads, such as the set supplied with
the power supply, for convenience in identifying polar-
ity, red for (+) and black for (-).
Make sure that the hook-up leads offer sufficient cur-
rent capability and low resistance between the power
supply arrd the circuits being powered. The hook-up
leads supplied with the power supply are rated for
3 amps,
TYPICAL CONSTANT VOLTAGE OPERATION
1. Before connecting the device to be powered to the
power supply, determine the maximum safe load cr.rrrent
for the device to be powered and set the cunent limit
value (see'Setting Current Limit" procedure in this
section).
2. Set FINE VOLTAGE control to center and COARSE
VOLTAGE control to minimum (fully counterclockwise).
3. Turn off power supply and connect it to the device to be
powered (see "Hook-Up" procedure in this section).
1. Turn on PCIWER switch. The CVindicator should light.
5. Press the V switch to select the voltage metering mode.
6. Increase the VOLTAGE setting until the LED display
reads the desired value, The EINE control permits
easier setting to a specific value,
7. Press the A switch to select the current metering mode
and note the load current on the displav.
8. If the load current exceeds the preset current limit, the
CV indicator will go off and the CC indiiator will light.
In this case, the power supply automatically switches to
the constant current mode, and further rotation of the
VOLTAGE control wiIl not increase the output voltage.
l0
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OPERATING INSTRUCTIONS
CV
indicatoron
-.. .r.DC
powen
suppr-ilo:il
Fig.4. Typical Constant Voltage Operation. Fig. 5. Setting Current Limit.
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OPERATING INSTRUCTIONS
SETTING CURRENT I.IMIT
i" Determine the maximum safe current for the device to
be powered.
Z. Temporarily short the (+) and (-) terminals of the power
supply together with a test lead.
3. Rotate the COARSE VOLTAGE control awav from zero
sufficiently for the CC indicator to light.
4. Press the A switch to select the current metering mode.
5. Adjust the CURRENT control for the desired current
limit. Read the cunent value on the LED display.
6. The current limit (overload protection) has now been
preset. Do not change the CURRENT control setting
after this step.
7. Remove the short between the (+) and (-) terminals and
hook up for constant voltage operation.
TYPICAL CONSTANT CURRENT OPERATION
1. Before connecting the device to be powered to the
power supply, determine the maximum safe voltage to
be applied, press the V switch, and set the VOLTAGE
controls to obtain that voltage reading on the LED
display.
Z. Determine the desired constant cr.rrrent value.
I t-,
,.L'
Adlustto
0esrrencurrenl
Preset
voltage
ilmrT
tz
Fig.6. Typicai Constant Current Operation.
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OPERATING INSTRUCTIONS
A
Set the CURRENT control to minimum (fully counter-
clockwise).
Turn off the power supply and connect it to the device
to be powered.
Turn on the power supply. The CC indicator should
Iight.
Press the A switch to obtain the current metering mode.
Increase the CURRENT control setting until the desired
constant current value is read on the display, or set the
cunent limit in advmce (before connecting the load) as
prescribed in the earlier "Setting Current Limit"
procedure
If the load current drops below the constant current
value, the CC indicator will go off and the CV indicator
will light. In this case, the power supply automatically
switches to the constant voltage mode, and further
rotation of the CURRENT control will not increase the
output current.
For example, if the load is such that the power supply is
operating in the constant voltage mode, a regulated output
voltage is provided. The output voltage remains constant as
the load increases, up until the point where the preset current
limit is reached. At that point, the output current becomes
constant and the outplrt voltage drops in proportion to further
increases in load. The crossover point is indicated by the
front panel LEI) indicators. The crossover point is reached
when the CV indicator goes off and the CC indicator comes
on.
Similarlv. crossover from the constant current to the
constant voltage mode automatically occurs from a decrease
6.
1
6.
CONSTANT VOLTAGE/CONSTANT CURRENT
CHARACTERISTIC
The working characteristic of this power supply is calied
a constant voltage/constant current automatic crossover
type. This permits continuous transition from constant cur-
rent to constant voltage modes in response to the load
change. The intersection of constant voltage ard constant
current modes is called the crossover point. Fig. ? shorvsthe
relationship between this crossover point and the load.
I llonsl2nt nrrrrpnl I
4
r Hange l
ii
VoMAX
loMax
t
I
I
0utput
Voltage Co
nstanl
Voltaqe
Ranqe
I
0utputCurrenl
Fig. 7. Constant Voltage/Constant Curent Characteristic,
1.)
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OPERATING INSTRUCTIONS
in load. A good example of this would be seen when charging
a lZ-volt battery. Initially, the open circuit voltage of the
power supply may be preset for 13.8 volts. A low battery will
place a heavy load on the supply and it will operate in the
constant cunent mode, which may be adjusted for a 1 amp
charging rate. As the battery becomes charged, and its
voltage approaches 13.8 volts, its load decreases to the point
where it no longer demands the full 1 amp charging rate.
This is the crossover point where the power supply goes into
the constant voltage mode.
CONNECTING TWO POWER SUPPLIES IN SERIES
Two Model 1635 power supplies may be connected in
series to provide a variable 0-60 volt output. In this con-
fig'.rration the power supply can supply up to 3 amps. See
Fig. 8 for the connection scheme.
When connected in series, the VOLTAGE controls of each
power supply exercise control over a 0-30 volt range. Add
the LED display readings together or connect the external
voltmeter jacks (V and COM) across the load to determine the
total output voltage.
Load current may be monitored from either supply; the
readings wiil be identical since they are connected in series.
Also, since the supplies are connected in series, it is only
necessary to set the current limit on one of the supplies; the
other may be set for maximum.
CONNECTING TWO POWER SUPPIJES IN PARALLEL
Two power supplies may be connected in parallel to
double the maximum load cunent. In this confieuration the
two supplies wili provide trvo 0-30 volt output at up to 6 amps
(heavier gauge hook-up leads are advisable). Current
equalizing resistors must be used as shown in Fig. 9.
I{owever, the protective current limiting featr.re will prevent
damage if current is temporarily unbalalced during set-up.
When connected in parallel and operating in the constant
voltage mode, determine the total load current limit ald
preset the current limiting for each porver supply to half the
total load current value. Then when the load is connected,
set the VOLTAGE controls on the two power supplies for
equal voltage readings. This should also provide
approximately equal current from each supply. Add the two
current meter readings together for total load current, or
connect an external ammeter in series with the load.
If the current equalizing resistors are not well matched,
it is preferable that the voltages be slightly unbalanced to
achieve current balance, Be sure that the supplies are ade-
quately balanced so that both remain in the CV mode.
When connected in parallel aad operating in the constant
curent mode, the VOLTAGE controls of both supplies should
be preset to the same value. Then when the load is connect-
ed, the CURRENT controls of the two supplies should be
adjusted for approximately equal current from each unit. Be
sure that both supplies remain in the CC mode.
USING TTIE EXTERNAL VOLTMETER FUNCTION
1. Press the EXTERNAL VOLT METER switch.
Z. Connect the positive side of the voltage to be measured
to the red (9 jact< a.rrdthe negative side to the black
(COM) jack and read the voltage on the LED display.
I4
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OPERATING INSTRUCTIONS
0utputvoltage
equalssumofbothdrsplays
(in
voltage
meteringmode)
Fig. 8. Connecting Two Power Suppliesin Series.
15
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