Maxtec B&K Precision 1660 User manual

Triple
Output
DCPOWER
SUPPLY
dlt*rur#ffi.i'
B&K 1660
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TESTINSTRUMENTSAFETY
- Normal use of test equipment exposes you to a celtain amor,rnt of dangel floh
electrical shock because testing ncust sohetioes be perfolrbeal \phere exposeil high
voltage is plesent. An electrica.I shock causiDg l0 milliamps of curlent to pass
thlougb the healt wilt stop most hu6an heartbeats. Voltage as Iow as 35 volts dc o!
ac llrs should be consideled dangelous and hazardous sin-ceit can proaluce a lethal
curlent under celtain conditioDs. Higher voltage poses an even gleate! tltleat be_
cause suc-hvoltage can laore easily ploduce a Iethal culreDt. your normal work
habits should include all accepted plactices that will prevent contact rrith exposeal
higb voltage, and that wiu stee! current a\eay flom you! healt in case of accialental
contact rpith a high voltage. You will sigtrificantly leduce tbe lisk facto! if you
know and obselve the followirg safety plecautions:
1. There is little dange! of electrical shock IroE the dc output of this power
supply. Hoeever, thele ale sevelal other possible test conditions using this
powe! supply that can cleate a high voltage shock hazard;
a. If the equipment utde! test is the "hot chassis,, tvDe. a selious shock
hazard exists unless tbe equipEent is uDplugged (usi turning off the
equipment does aot remove the hazard), o! the plecautions ot Jtep g are
observed.
b. If the equipbeDt under test is "powered upi (arxdthat equipEent uses
high voltage in ary of its cilcuits), the polve! supply outputs may be
floated to the potential at the point of connection, Remeober that high
volta_ge Inay appea! at unexpected points in defective equipbeot. Do
llot float tbe po.re! supply output to more tban 100 voit; peak with
lespect to chassis or earth ground.
c. If ttre equiproent under test is ,off', (and tbat equipEent uses high vol_
tage ilr aIly oI its circuits unde! nornra.I opelatiotr), discbalge higb_
voltage capacitors before baking coDnectioDs or tests. SoEe cilcuits
retaiD high voltage long after the equipraeDt is tuDed off,
Z. Use olly a poladzed 3-wi!e ac outlet. This assures that the powe! supply
cha6sis, case, and ground telrainal ale conlected to a good eartir Stounil anil
reduces dange! florD electlical shoclg
3. DoD't expose high vottage neetllessly. Remove bousiags aDd covels only whea
neceasaly, T[ra off equipEe[t while Eaking test coDnectioDs in higb-voltage
cilcuits. Discbarge higb-voltage capacitols after reEo\ring powe!.
4. lf possible, faEiliafize youlseu with the equipE ent beiDg testeal and the lc_
cation of its high voltage points. However, letlembe! tbat high voltage Dlay
appear at rEerpected poiuts in delective equipmert.
waRl||ltc
{codtinued oa inside rear cover)
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lnstruction
Manual
for
Jt1}lr,
s(t^Ect--,t
MAXSE9 TNTERATONAL CoPrr.
Model1660
TripleOutput
DC
POWERSUPPLY
H( PEECES'-,J
MAGg TNTEFNAIIONAL
coFP.
6470 w Corlland St . ChlcaSo, lL6O635
B&K 1660
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TABLE OF CONTENTS
page
TESTINSTRUMENTSAFETY. .. , .
irside
front coier
INTRODUCTION ., ".......I
FEArijllES .......3
sPljcii::a-.!
r:lN:-i. .... .,,'4
CONTROLS
AJI INDICATORS. ..... -...
General
ConttolsAndlndicators ........ . .. 5
4-6.5
\'supplyControlsAndlndicators. .........5
Ma.ster Suppl-v
Controls ,{nd lndicatols . . , . . . . . ' . . . . . . . . 5
SlaveSuppl-v
ControlsAndIndicators
. . . , . ...... ., . .?
Rea-lPanelControls.. ...... '. .... .8
CPERAT]NG
INSTRUCTIONS .....,,,,,9
Safet-v
Prec:.rrtions ...... ,9
Equipment
Precauiions .............9
lndependent
UseOf "Master"
Or "S1ave"
SupPl]'... .. ... 9
SeriesTracking
Opelation. .. ......13
Pa-rallei
Tra.ckingoperaiion
. .....'.16
,1-6.5
VPoirelSupplyOpelation. .'......''.'.19
APPLICATIONS ......,..,. ZO
Generat.. ...'.........20
Electronics
Servicing. ............20
ElectronicsManufacturing .........20
Electlonics
DesignLab
. . . . . . ...,Z0
ElectlonicsEducation. . ' ' ' '...21
Battery
Charging ..... -.. ZI
Split
SuPPI-\' .,..........21
MAINTENANCE. .,..... "..25
Fuse
Replacement ...... 25
Line
voltage
Conversion ',.,... --.. 25
Adjustments. ..' . ...--26
lnstrument
Repai!Service. ... .'.'.30
WARRANTYSER\TCEINSTRUCTIONS.... ......31
UMITEDONE.YEAR
WARRANTY .............32
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INTRODUCIION
Tbe B & K-hecisi@ Model 1660 Triple
Output DC Powe! Supply is a higb quality,
genela.l purpose dc power soulce. It provides
two supplies with a 0-30 volt dc output and
ong with a 4-6.5 volt dc output. The 0-30 v
supplies are adjustable with both coarse aJId
fine voltage contlols for precise settability
and are capable of current output of
0-2 arops. The 4-6.5 v supply has a current
output of 0-5 a.Eops,allowillg it to hanille ex-
tensive digita.l Iogic circuitry. Two la.rge
palel-Eoormted LED oete! displays caD moEi-
tor eithe! the output curtent or output voltage
o{ each supply.
The two 0-30 volt supplies can be opelated
independendy or in one of two tlackilg
r:oodes. In the selies tlackilg Eode, the Slave
supply tracks the voltage of the Ma.ste!
supply, MaxiEuo curlent settidg of the two
supplies can still be set independently \rhen in
the selies tlackitrg operating 6ode, In the
seri€s tlacking mode the Maste! aIId Slave
supplies a.!e connected in se es, allowing a
singie output of 0-60 V at up to 2 aDcps.In the
patallel tlacking Eode, the two supplies ale
connected together iD parallel, allo\ring a sin-
gle 0-30 V output at up to 4 amps.
Both 0-30 volt supplies may be used itr
constant voltage o! constart cutrent appli-
caiioDs. The clossove! floB constant voltage
to constant cu.!!ent modes is sEooth a.nd
autoEatic. LED'S indicate tbe "CV' (coDstant
voltage) or "CC" (corBtant cu!!e!rt) l3ode of
operation. In constart voltage applications, a
curlent limit loay be preset, when load va-ri-
ations cause the c{rlent to reach the preset
lioit, the unit then regulates output cu!]ent
lathe! tha! output voltage. Cullent liloits are
adjustable frorD 5% to 10070oI b:axixouEr. IrI
constant current applications, the rDaxirDurD
voltage may be preset. When load valiatioas
cause cuJrent to dlop below the legulated
value, the unit reverts to legulated voltage
oDeration at the Dreset value,
allows tbe supply to be used for large ci!-
cuits, Built-in ovelload protection auto-
matically liEits to cutiebt output to a Eaxi-
loull] of 5 aEps. An indicato! lights when the
supply is ovelloaded,
The Model 1660 exhibits excellent regu-
Iation ard low pple charactelistics. The ciF
cuit design incolpolates a pre-legulato!, whic-h
greatly leduces intelnal powe! dis6ipation at
low output voltages.
Revetse polarity protection plevents acci-
dedtal daEage to the poi/ef supply lroE iE-
ploper coDnection to a.aextelnal voltage, and
curreat lioitilg plotects the equipEeDt being
powered, as weII aEthe power supply.
The output is isolated flou chassis alrd
earth glound, which p€lmits full flexibility of
comections. Wbed needed, the (+) o! (-) po-
Iality llay be stlapped to glound, o! either
polarity !!ay be floated to an extelnal vol-
tage. Additiona.Uy, the two 0-30 volt supplies
can be used as a "split supply" with two posi-
tive voltages and a comDon negative, two
aegative voltages and a cotDllon positive, or
one positive, otrenegative, and a cor!6on. AII
of these coiligurations ca]l be used with eithe!
datching (tlacking) or dif f eling {independent)
voltages.
The features aJId versatility oI the unit,
especially tbe triple output and tracking
featues, make it an ideal genefal purpose
powe! supply for engineering lab appli-
catioas. It can serve as a single o! multi-
voltage powe! source, including tbe bias suF
ply, fo! breadboard and Fotot]?e circuits and
equipEent. It can provide single o! sillul-
taneously valying voltages for ctcuit eva.lu-
ation. It can provide tracking (+) and (-) vol-
tages fo! evaluating diffelential aEplifiers. It
may be used as a battery eliminator, or to
power individual circuit boalds o! caril6 while
temoved llom the systeh, Its output ca'I be
evafuated vrhile poweling a bleadboald or
Drototv'De cilcrdt to determine the cilcuit's
The 4-6,5 V supply is ideal for powering
digital logic circuitly, The 0-5 allp capacity
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INTRODUCTION
powel suppty requi!emerts. Its labo!atory
quality specifications will loeet most engi-
neering labo"a.tory requi!ements.
The same featules that make the Mod€l
1660 a good choice fo! a]} engiaeeling lab also
Dake it a good choice fo! dost other solid
state electronic applications. These apPli_
cations include selvice shops; industrial Pro-
duction testing of coDrponents' assembli€s, and
collplete equipment; fo! school labolatolies,
and
home usebv electronic hobbyists.
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FEATURES
TRIPLE OUTPUT
Operates as thlee separate power supplies.
Eacb has floating output and is completely
isolated flom the other two.
ONE ,{ TO 6.5 V SUPPLY
Husky 0-to-5 amp 4-to-6.5 volt suPpty is
ideal fo! use with Dost di$tal logic
circlritly, Adequate cuilent capacity for
extensive circuitly.
TWO O-30 VOLT SUPPLIES
Master and Slave supply are continuously
variable ovel 0-to_30
volt range with coarse
and fine controls. Each supplv has a Z amp
current capacity.
UMQUE TRACKING FEATURE
The two 0-to-30 V suppliescan be operated
so that the Slave supply tracks the Master
supply. Outputs can be strapped fot two
positive voltages with a comDon negatrve)
two negative volLages
dith a common posi_
tive, or one positive and one negative with
a neutra.l
common.
SINGII G6O V SUPPLY
Series tracking feature allows use of Master
and Stave supplies as one 0-to-60 V. Z alnp
supply.
SNNGIJ O_30
V 4 AMP SUPPLY
Palallel tracking feature allows lise of
Maste! and Slave supply as a 0-to'30 V
supply with a :1amp current capacity
(through
MasteF
output terminals)
CONSTANT VOLTAGE OR CONSTANT
CURRENT
The Master and slav- .Lpplias pro! d-
regulated dc voltage output or regulated dc
.urent output- Crossover is sEooth and
LED DISPLAY
Two large, easy-to-read LED 3-1l2 digit
displays monitol outPut voltage or output
cu.relrt of aU three supplies. Use of two
meters allows simultaneous current and
voltage metering when use M3ste! alld
Slave suppliesin tracking oPeratioD. Good
visiblilty in bright o! loq light. Meter
auows
resolution of 0.1volt or 0.1 amp.
LABORATORY QUAIITY
Excellent !eeulation. 1o$tiPPle.
LED INDICATORS
Identify modeof ope!ation.
PRE-REGULATOR
Limits internal dissipation {o! hiehe.
reliability andefficiency.
ISOLATED OUTPUT
Either pola.rity may be floated or grounded.
OVERI-OAD PROTECTION
Fullv adjustable cullent limiting (from 5%
to 100% of mdimurn output curentl lor
Vaste! and Slave supplies protects circurt
under test and the Poqer suPPlY.
REVERSE POLAR.ITY PROIECTION
Prevents damage to porter supplv lrcrm
external voltage of revelse polaritv
HOOK.UP CABLES
,supplied
with three sets of red ard black
hook-upleads.
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SPBCIFICATIONS
ITASTBR AND $../lVE SUPPLIT-S Load Reeulatiod (C@start Vottage):
outFt vortrge Rage, =l0 ov (0 to 5 A load)'
0 v {+0/-30mv) to 30v + (3 b 1qo)' Lire RegutatioD
108
- l3z v (coEtaDt
OutFrt Curl€ot Lieit Rdge: VoltaSe):
0A (+0/-30 EA) to 2A +(3Vo
to 7Vo). <10DcV.
Load Regulatio! (Cdstart Voltage): Ripple A.!d Nobe:
<0.01%+
3bV. =ZrbVRMS,
LiDeR*ulatioD 108
- 132V (Consta"r
Voltage): -- OvelYoltage hotection Thteshold:
<
0.01%
- 3bv.
Rittrtle (CoDsteDtVoltag€): Peel Meter Accuract':
<I EV RMS. SameasMaste!
SuppiyMete!.
Recoeery TlEe (Constart Voltage):
<loo ss' cENERAL
Tehlr Coclficieot (C@rtart Voltage):
= 3OO
ppb/oc. Poeer RequireEents:
110/1zo/220/z4o
vAC !1070.s0/60Ilz-
Load R€gulation (CcE3ta[t CrErent]:
< 0.2Vo
+3 mA- po;'er CoDsurnptioD(FuIy Loaded):
Lile Reguration108
- l3z v (c@start ApproxiEately 320\4t'
CErent):
< O.Z7o
+3 E'A. hotection:
Revelse poladty protection and cur!ent
Rilple Cr|f!€ot (at 108V Io! CoDstant liEiting.
Crttfeot]:
<3 IlA RMS. DiDeDsiors (E :<Y r D):
165x 315x 381bra (12.4
x 15x 6.5"),
Tbackiry (S€ries):
t1.Zqo
+10nV, E'eigbt:
P&el lileter Accrracy (volts): 10kg (22lbs)'
i0.5%+ 2digits.
pdel MetetAcc|racr (cEreDt): TffiS,"Tff;?up leads,I !ed, I black.
J0,5 % + 2 digits. Two ea.rth ground bus stlaps.
Two 5A, 250V fuses (spares),
,F&5 V SUppLy Schematic DiagraB & palts List,
OutFrt Volt.€e RaDg€: Ootionel Accessori€3:
4 Y t57o to 6.5 V r5Vo. Fp-tO l6-amp test leads (t red, 1 black).
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CONTROLS AND INDICATORS
GENERAL CONTROLS AND INDICATORS
1. POWER Ssitch- Tutns Power on and
off, When powel is on, sxitch is inter-
nally iuuEi ated to serve as a Pilot light.
Z. TRACKING Mode Seitch€s. Two push-
button switches that select INDEPendent
oode, series tlacking mode, or Parauel
t!acking mode as follows:
a. When both switches are disengag€d
(out), the unit is in the INDEPen-
dent mode arld the MASTER ard
SLAVE power suPPlies are com-
pletely ind€Pendent llom one
anotDel,
b, Whenthe left switch is engaged
(in)
and the right switch is disengaged
(out), the r]nit is in the TRACKING
SERIES mode. In this mode, maxi-
mum voltage of both suPPlies
is set
using the MASTER VOLTAGE con-
tlols (voltage at outPut telminals
of the SLAVE supply ttacks the voi-
tage at the output teloinals of the
MASTER supplvl. AIso. in this
roode of operatiod the Positive
terminal (red) of the sLAvE supply
is connect€d to the negative termi-
nal (blackl of the MASTER supPly.
This a]lo\rs the two suPplies to be
usedas
one0-to-60 volt suPPIY.
c. When both switches ate engaged
(in), the uiit is in the TRACKING
PARALLEL rnode, ln this dode the
MASTER and SLAVE suPPlies a.!e
wiled together in palallel and both
the maxilouE cuirent and voltage
are set using the MASTER con-
trols. The MASTER alrd SLAVE
outputs can be used as two iDdi-
vidual (but tracking) power suPPlies
or just the MASTER output can be
used as a 0-to-30 volt supply with a
4 A capability,
3. (F30 V/+6.5 V Ssitcb Controls MAS-
TER/,1-6.5 V LED DisPkY. wlen this
switch is in tbe G30 V position' the LED
display looniiors the MASTER (0-30 V)
supply, when this switch is i! the
tr-5 V position. the LED disPlay moni-
tors the 4-6.5 \' supply.
.1. A/V Switcb- Selects current cr voltag€
meterirg mode for the MASTER 0-30 v
supply or the ,F6.5 V supply (dep€ndiBg
oD setting of (F30 V/,1-6.5 V switch).
When in the A (amPs)position, cu.rlent is
read from the MASTER/,|6.5 V LED Dis-
play. When in the V (vo1ts)
position' vol-
tage is read from the MASTER/ 'F6.5 V
LED Dispray.
5. MASTER/4-6.5 v LED Dispray. Digital
dis?tay indicates voltag€ or cuffent at
the O-30
v MASTER supply
or the'1-6.5 v
supply (depending on the setting of the
MASTER A,/V aid 0.30 V/4'6.5 'V
4'6.5 V SUPPLY CONTROLS AND
INDICATORS
6. '-' Tedrinal (Blact). Negative Polatity
output terminal for 4-6.5 V suPPIy'
?. "+" T€rniral (Red)- Positive Polarity
output terminal for 4-6.5 v supPly.
8. Voltag€ Level C€'rtrol. Adjusts output
voltage to! 4'6.5 V supply, Fully coun-
terclockwise !otation adjusts otttput voi_
tage to 4 V. Clockwise rotation in-
cleases voltage to a maximuEr of 6'5 v
(full clockwiserotation).
9. 5 A OVERLOAD IDdicatot. Lights when
load on 4_6.5 Volt suPply becoloes too
1arge.
MASTER SUPPLY CONTROLS AND
INDICATORS
10. C.C. (CoDstant Crr'ledt) Irdicator. Red
LED lights when MASTER SUPPIY
is in
the ConstaDt Cu$e$t mode' The Powe!
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CONTROLS AlfD INDICATORS
I
E66-l
0l
Il
3
ti; f
r '.li+:,.
I
E EI
l3
l4
I8
2021
25
26 17 15
Fig. l. Front Panet Contlols And Indicatols.
11.
13.
Supply regulates the output culleDt at
the va.Iueset by the IIASTER CURRENT
control. In the Parallel Tracking Eod€j
when this indicato! is lit, both trle
MASTER aJId SLAVE supplies are in rne
Constant Current Eode.
C.V. (C@staDt Voltage) Iadjcator. Green
LED lights when the MASTER suppty is
ir the Constant Voltage mode, The
Power Supply regulates the output vot,
tage at the value set by the MASTER
VOLTAGE controls. ln erther the SeFies
or Parallel Tracking Eode. when rhrs
in-
dicator is lit, both the MASTER alrd
SLAVE supplies are in the CoDsta.nt Vol-
tage mode,
COARSE VOLTAGE Corttol. Codse
adju.stment of the output vottage of the
MASTER supply. Atso functjons a
coarse adjustEenr coutlol fo! the maxi
Eouh output voltage of the SLAVE supply
when eithe! paraUel o! seli€s tracunp
Eode is selected. Read the value on the
MASTER/4.6.5 V I,ED Distr'lay when the
voltage iv) and master l(F30 V) Eeterins
modesale selected.
FINE VOLTAGE Cmbol. Fine adrusr-
ment of output volrage of the MASIIER
supply. A160 firnctions as fine adjust-
Dent control fo! the Ea-{iEum outDut
voltage of rhe SLAVE supptywheneitier
palallel ol se es trackiDg mode is se-
lected. Read the value on the MAS-
aE.R/4.5 V IlD Display when the vol-
tage rV) afld Daste} ,(F30 l/ meterins
IIrodesare selected.
CURRENT C@trol. Adjusts currenr
Iimil of MASTER suppty in constant vol-
tage rDode. Adjusts constant curlent
value of MASTER supply in constant cuJ-
lent mode. Cutrent can be aead ftolc
the MASTER/4.6.5 V LED Display when
the current {A) and rDaster ((F30 u
metedng modesare selected,
rz.
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CONTROI.S AND INDICATORS
o
o
€
Fig. Z. Reat Panel Controls'
15, '+' TerEiral (Re(l). Positive polarity 19.
output telminal fo! the MASTER suF
ply. Also serves as the PositivePolarity
terminal for 4 A palallel aJId 0-to-60 V
series tlacking oPelatiotl.
16. GND T€fmiDal (Green). Earth aJId
Cbassis Ground.
17. '-' T€rminal Elack). Negative polarity
output telminal for the MASTER sup- 20.
ply. AIso selves as the negative Polarity
telroinai for 4 A palallel tlackiDg opeF
ation. In series tlacking opelation. this
telminal is intelnally tied to the {+)
positive telminal oI the SLAVE suplly'
21.
SLAVE SUPPLY CONTROIS AND
INDICATORS
18. C.V. (CoD3taDtVoltage) Indicato!. Green
LED lights when the SLAVE supply is in
the Constant Voltage mode. The Power
Supply regulates tle output voltage at 22.
the value set by the SLAVE VOLTAGE
C,C. (C@stant Curr€.rt)/PARalle-r I t-
cator. Red LED lights when SLAVE
supply is in the Constant Culreirt mode'
The Powe! Supply legulates the output
current at the value set bv the SLAVE
CURRENT contlol when in the selies
trackiag o! INDEPendent modes. AIso
lights when the TRACKING PARALLEL
modeis selected.
COARSE VOLTAGE Cdlrol, Coarse
adjustment of the outPut voltage of the
SLAVE supply when the INDEPerdent
mode is selected. Read the value on the
SLAVE LED DisCay when the voltage (9
meteling rDodeis selected.
FINE VOLTAGE Control. Fine adjust-
xoent of output voltage of the SLAVE
suppiy when the INDEPendent Eode is
selected. Read the value on the SLAVE
LED Display when the voltage 19
Eetering mode is selected.
CURRENT C@trol Adjusts curent
limit of SLAVE supply in constant vol-
tage trode. Adjusts co$stant curlent
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CONTROLS
AND INDICATORS
value of SLAVE supply in constant cu;!,
rent mode. Current can be .ead from
the SLAVE LED Display wher the cur,
lent (A)metering mode is selecled.
23. A/V SFitc-b. Selects current or voltage
metering mode for tbe 0-30 V SLAVE
supply, When in the A (aqlps) positiotl,
culnt is lead from the SLAVE LED
Display. When in the v (volts) position,
voltage is read lrom the SLAVE I-ED
Display.
24. SLAVE LED Display. Digitat disptay
iddicates voltage or current at the
0-30 V sl-AvE supply (depending on the
settiDg
of the A/V switch),
25. '+' Tetbiaal (Red). positive potadty
output telminal for the SLAVE suppty,
In series tracking operation, this termi*
nal is connected
to the negative terminal
of the MASTER supply.
26. cND TerEciDa.l (c!een). Ealth and
Cha.ssis
Ground.
27. "-" Terminal (Blact). Negative pot:rity
output terminal fo! the SLAVE supply.
AIso selves as the negative polarity te!-
miDal Io" 0-to-60 V series tracking opeF
REAR PANEL CONTROLS
28. Fuse.
29. Line Cold
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OPERATING INSTRI'CTIONS
SA.FETYPRECAUIIONS
cAuttoL
Avoid contacting the heat sinks
at the lear oI the power supply,
Wben the unit is ploviding large
a&ounts of cu$ent at any or all
of its outputs, the lteat sinks can
becoEe very hot. CoDtacting
the heat sinks when they ale hot
could lesult itr skin burDs o!
damage to the equipEeEt in con-
tact with thetn.
Use only a polarized 3-wi!e ac
outlet. This assures that the
power supply chassis, case, and
ground terEinal are connected
to a good earth ground and re-
duces dange! flom electlical
shock.
There Eay be great danger of
electrical shock if the powe!
supply output is conDected to an
extelDal high voltage. SoDe
equipdent beiDg poweled may
contain high voltage and plesent
Althottgh the power supply is protected
against levelse polarity daEage, the cilcuit
being powered Eay not include such PIo-
tection. Always calefully obselve polarity;
incoffect polarity loay daEage the equiprdent
under test.
Do not exceed tbe voltage rating ot the ci!-
cuit being powered- Many transistots and
integrated cilcuits will not *ithstand voltage
There is tro $eed to wo!!y about voltage
spikes o! ovelshoot damagiDg the equipEent
under test. The voltag€ between tbe output
terEinal,s of the power supply neve! exceeds
the preset value as the POWER switch is
turtted on or off.
INDEPENDENT USE OF 'I,ASTER' OR
.SLAVE' SUPPLY
The "MASTER" and "SLAVE" supplies each
plovide a 0-to-30 volt output at up to 2.0
aDps. This plocedure covers the use of tbe
MASTER ard SLAVE supplies only when they
are used independently from one another.
When used in the INDEPendent opelating
mode, the opelatiEg contlols of the t\ro powe!
supplies are colt|pletely independent and eithe!
supply can be used ildividually o! both can be
used sidultaneou.sly. Basic operation is
covered be!e. Several vadations are covered
in the APPLICATIONS section oI this Eanual.
Eool-r{)
l. Diseugage both TRACKING mode
switches (both switches out) so that the
powe! supply is in the INDEPeDdent
operating rbode.
2. TUrn off the power supply and the
equipEent to be poweled during hook-up.
3. Condect the positive polarity of the
device being powered to the red (+) teF
llinal of the powe! supply.
Obse!ve
cautioD, Ii the power supply
output is floated (lefelenced to
a voltage ratbe! than earth
grotllld) turn off the power
supply a.Ild the equipEelt uDde!
test when making connections.
Never float the power supply to
a potential gleat€! than
100 volts peak with lespect to
eattb ground"
EQIJIPXENT PRICAUTIO S
Avoid rising the powe^r supply in ambiert
teEpelatures above +40" C. Always allow
sufficient air space alound the heat sink at the
lear of the powe! supply for effective ladia-
tior to prevent internal heat build-ul.
a sbock hazald"
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OPERATING INSTRUCTIONS
I !.! ,l rE.[ _'1 f'l a'1 1 | t- t-
lt s.u
I l-',r.f, f D,D
Fig. 3. Independent
Operation GroundingPossibilities.
10
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OPERATING
INSTRUCTIONS
i[. Connect the negative pola]ity of the
device being povreled to the black H
terminal of the powe! supply.
5. Fig. 3 illustlates the glounding possibil-
ities when used in the INDEPendent
a. If t]re negative polality of the
equipoent ol ctcuit being powered
is also the chassis o! common, it
may be glounded to eatth by
stlapping the black (-) telminal to
the g!€en (GND) teroinal as sho\rn
in Fig. 3A.
b. Similarly, the positive polarity can
be groulded by strapping the red (+)
terminal to the gleen (GND) ter
miRalasshownin Fig. 3B.
c. If aI} ea-lth $ourd refer€nce is not
required, the codfiguratio. of Fig,
3C may be used. The scheEe in
Fig. 3C should also be used where it
is not krown whether the chassisis
common wiih either the Positive o!
negative polality,
d. If the chassis or common of the
equipEent being powered is sePa-
r^fF fr^m hoih thF Dositive and
negative polarity power inputs' use
the connection
shownin Fig. 3D.
6, Observe ploper pola.rity. II the cilcuit
being poweled is not equipped with re-
verse polarity plotection, darnage to the
circuit can lesult froE reverse polarity,
Use color coded hook-up leads, such as
the sets supplied \tith the powe! supply'
for convenience in identifying polarity,
red for (+) and black for (-).
?. Make sure that the hook-uP leads offer
sufficieDt cuilent capability and low !e-
sistance between the power supply and
the circuits being poweled. Th€ hook-up
Ieads supplied with the powei supply are
ra.ted fo! 3 arDps.
Typical C('rstant Voltage OFlation
Befoie connecting the device to be pow-
eled to the power supply, determine the
maximum safe load curent for the
device to be powered andset the cutlent
limit value {see "Setting CuFent Limit"
n'^.o;!!i4 in ihi< c..ri^rl
Set FINE VOLTAGE control to c€nter
and COARSE VOLTACE control ro:rin
imu& (f
ully cotrnterclockwise).
Turn off power suppll' and corurect it to
the device to be powered (see
"Hook-Up"
procedure
in this section).
Turn on POWER switch. The CV indi
cato! shouldlight.
Set the meter selection switch to the V
position to select the v^'tae- mete?ing
mode.
Increase the VOLTAGE setting until the
LED display rea.dsthe desired valu€. The
FINE control permits easier setting to a
specific value,
Set the meter selection switch to the A
position to select the cu$ent oetFring
mode and note the load curient on the
display.
3.
6.
7.
1.
FeadoulPrt!ciaQe
a'rocurrsnl
lromdspa! CV r0cai0r
01i
\i
\l
oc 4{EF sumY ,F0
I [.C - '_] tr.0,
t.rl:
EC
!013q€
11
Fig. 4, Tnical Constant voltage Operation'
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OPERATII{G INS1RUCTIONS
8, U the load curlent etceeaLs the ple3et
cu*ent liDit, the CV ildicato! will go
off and the CC indicator wiu light. ID
tbis case, tbe powet supply autoDatically
switches to the constant cullent Eode
altd furthe! rotation of tbe VOLTAGE
contlol wiU not ircrease the output vol-
tage.
SettiDg CurtcDt LiDit
1. DeterEine the r:taxiEum safe curreDt fo!
the deeice to be powered-
2, Telopolalily short the (+) arld (-) ter-
D:ibals of the powe! supply togethe! with
a test lead,
3. Rotate the COARSE VOLTAGE contlol
away froE zelo sufficiently fo! the CC
indicato! to ligbt.
4. Set the Eete! selection s\ritch to tbe A
position to select the cuflent loetering
rnode.
5. Adjust rbe CI'I{RENT contlol {or the
desi!€d curlent liEit. Read the culleDt
value od the LED display.
C.C
Indcalor
0N Read
currentlmt
valuelr0m
dsplay
6. Tbe cullent libit (oeerload plotectioD)
has now bee! pleset. Do not change the
CITRRENT codttol settiDg atter this
step.
?. Rebove the sbolt betweeD the (+)aDd (-)
telminals and hook up for constalt vol-
tage opelation.
Typical CoDstrnt Cr!!€ot O!€ratioD
1. Before connectiEg the device to be pow-
eled to the power supply, detelBiDe the
Eaximurb saJe voltage to be applied, set
the mete! selection switch to the V posi-
tion, alld set the VOLTAGE controls to
obtaiD that voltage reading on tbe LED
display,
2. DetelEine the desired constant cu|nt
3. Set tbe CURR.ENT control to ErmEum
(f
ully counterclockwise).
4. Turn oif the power supply and connect it
to t}|e device to be powelea!.
5. Tula on tbe power supply. Tbe CC indi-
cato! sbodd light.
n
L)ln
IJ
Temporariy
short
{-) and
( )
@
t
fulrdrange
rmi
cc
ndicalor
0N lrom
drsplay
BO:3
volage
mt
0esreilcufrenl
Fig. 5. Setting Curlent LirDit. Fig. 6. TlTical Codstant Crrrent Opelation.
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OPERATING INSTRUCTIONS
6. Set the Eete! selection switch to the A
position to obtair the curlent Eetering
lllode.
?. Incease the CURRENT control settitrg
until the desired constant cu!!€nt value
is read on the display, or set the culent
Iimit in advance (befole connectidg the
load) as prescribed earlier in the "Setting
Cullent Limit" procedr.ue
8. If the load culrent clroPsbelo\t the con-
stant cullent value' the CC iidicator
will go off aJId the CV indicato! wiu
tigbt. In tlis case, the por'ei suPPly
autooatically switches to the constant
voltage 6ode, aDdfurther rotation of the
CURRENT control will not increase the
output crflent'
C€Estant Voltage/CottetaDt Curent
Charactedstic
The working charactelistic of this power
supply is called a constaDt voltage/constant
cutleDt automatic clossover t'?e. This Per-
rnits continuotrs tlansition floh constant cur-
rent to constant voltage modes in reslonse to
the load change. The intelsection of constant
voltage and constant crrllent modes is called
the crossover point. Fig. 7 shows the relation-
sbip between this crossove! poirt and the load.
Fo! exadple, if the load is such that the
powe! supply is opelating in the constant vol-
tage roode,a reguiated output voltage is pro-
vided, The output voltage lemairs constant as
the load iDcreases, up uDtil the point v,thele
the preset cutlent Iimit is reached. At that
point, th€ output cu.}lent becohes constant
and the output voltage drops in Fopoltion to
furthe! increases in load, The crossove! point
is indicated by the front panel LED indi-
cators. The clossovei point is reached when
the CV indicator goes off and the CC indicator
SiEilallv. crossove! flom the constant
curlent to the constant voltage mode auto-
matically occuls fror! a ileclease in load' A
good example of this would be seen when
charging a lz-volt battery. Initially' the oPen
cilcuit voltage of the powe! suPPly Eray be
preset for 13.8volts. A low battery will place
a heavy load on the supply aJIdit will opelate
iE the constant culredt mode' which may be
adjusted for a I aIlP chargitlS tate. As the
battery becomes charged' and its voltage
apploaches 13.8 volts, its load decleases to
the poiDt where it no longer deoands the full
I aElp charging !ate. This is the clossover
point whele the power supply goes into the
constant voltaee mode.
1
I
___-L
Fig. ?, Constant Voltage/Constant Cutlent
Characte!istic.
SERIES TRACKING OPERATION
when the selies tracking mode of oPelation
is selected, the positive (red) telrDinal of the
SLAVE supply output is internally connected
to th€ negative (black) telmillal of the
MASTER supply, This allows the Powe! supPly
to be used as a single 0_to-60 volt Power
supply simply by using the negative (black)
telmina.l oI the SLAVE supply a]Id the positive
(!ed) telminal of th€ MASTER supply.
In the selies tracking mode, the ltraximum
outFut voltage of both the MASTER and
SLAVE supplies can be sirDultaneously varied
with one coDtroi. The ma-yiEluroSLAVE supply
voltage is autoaatically set to the sarne value
as the MASTER supply by using the LASTER
VOLTAGE contlols,
Simultaneous metelillg of both current and
voltage can be obtaided in this mode of oP_
eration by setting one of the displays for cur-
rent Eleteling ajld one fo! voltage metering.
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OPERATING INSTRUCTIONS
In this case, the output voltage (across the two
suppliesi is actually double the displayed
value. For example, if the MASTER disptay is
set fo! voltage meteling ard the SLAVE dis-
play for current oetering, the output voltage
acloss the MASTER positive (red) tellninaf and
the SLAVE negative (black) telmiDat would be
double the reading on the MASTER LED Die-
play (since both supplies are putting out the
sarDe voltage), The actual output current
would be the value lead frob the SLAVE LED
Display (since the t,ro supplies are wiled in in
series, current flowing through each supply
Eust be equal).
1. Set the power suppties to the TRACKING
SERIES mode by engaging the left
TRACKING switch and release the lieht
TRACKING switch.
Z. Set the (F30 V/,t-6.5 V switch to the
G30 V position the MASTER A/V switch
to the V (voltage meteling) position, and
the SLAVE A/V switch to the A (current
Eetedtlg) position,
3. Set the SLAVE CURRENT control to the
fully clockwise position. The inaximum
curlent is set using the MASTER
CURRENT control. Follow the in-
stluctions fo! "Setting Clrrent Limit"
(INDEPENDENT USE OF "MASTER" OR
'SLAVE" SUPPLY section ol this manuatl
using the MASTER CURRENT control.
NOTE
Because the supplies are being
used in sedes, eithe! CURRENT
contlol can be used to s€t maxi-
dlurh crl}Ient. II desired. the
MASTER CURRENT control ca
be rotated fully clockwise and
the SLAVE CURRENT control
can be us€d to adjust the maxi-
rnum curlent value. Because
current through the two supplies
must be equal when they are
being used in se es, the lowest
CURRENT control setting wiu
set the rnaxihum output cu!!ent.
4. Adjust the output voltage to the desiled
level using the MASTER VOLTAGE con-
trols (rerel:)ber that the actuar ourDur
voltage is double the reading on the
MASTER LED Display).
Turn olt the power suppty ard the
equipment to be powered during hook-up.
Connect the positive polarity of the
deqice being powered to the led (+) te!-
minal of the MASTER poweF supply,
Connect the negative polality of the
device being poweled to the black (-/
terminal of the SLAVE powe! supply.
Fig. 8 illustrates the grounding possi-
bilities when the lmit is used as a 0-to-60
volt supply.
a- If the negative polality oI the
equipment or circuit being powe!ed
is also the chassis or common, it
may be grounded to ealth by
stlapping the black (-) terminal of
the SLAVE supply to the green
(GND) terr'inal of the SLAVE
supply asshovD in Fig. 8A,
b. SiEilallyr the positive polarity caJI
be glounded by strapping the red (+)
teirDiDal of the MASTER supply to
the green telminal of the MASTER
supply asshown in Fig. 88.
c. lf "split supply" operation is de-
sired, a positive and negative voF
tage with a center ground car be
acheived by stlapping the black \-/
t€rminai of the MASTER supply to
the green {GND) of the MASTER
supply as shown in Fig, 8C. See the
APPLICATIONS section of this
manual for rhore infolEation on
"split supply" operation.
NOlE
Ii one of the supplied $ound
straps is to be used, only use it
hr one of these three ways. Con-
necting two ground straps could
ground both the positive and
negative terminals and load
down the power supply, causing
d, If an ealth gtound lefeience is not
required, the configuration of Fig.
8D may be used. The scheroe in
1.
8.
5.
6.
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OPERATING
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e0.0
'r,:.'
t:
Fig. 8. Selies Tlackirg (0-to-60 v) Opelation Glou.nding Possibilities.
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OPERATING INSTRUCTIONS
Fig. 8D shou.ld
also be used whele it
is not }crown wbetber tbe chassis is
cohmon with eithe! the positive ol
Degative polality.
e. If the chassis o! comEon of the
equipEent being poweFed is separ-
ate tlol]l both the positive and neg-
ative polality powe! inputs, use the
conlrection shown in Fig. 8E.
9. Obselee proper polarity, If the cilcuit
being powered is not equipped with re-
verse polatity protection, dabage to the
cilcuit can lesult flom leverse polality.
Use color coded hook-up leads, such as
the sets supplied with the power supply,
for cotrvenience in identifyiEg polalitt,
led fo! (+) a:rdblack for (-).
10. Make sure that the hook-up leads oller
sufficieDt curlent capability and low !e-
sistance between the power supply and
the cilcuits being powered. The hook-up
Ieads supplied .lvitb th€ power supply are
rated fo! 3 amps,
PARALLEL TRACKING OPERATION
In the palallel tracking mode of operation,
both supplies are strapped togethe! (in paral-
lel), This auows for a 0-30 V supply with a 4
ardp current capability. Onty the IIASfiR
output telminals are used fo! parallel tlacking
opelatioD. ln the paldlel tracking mode, the
SLAVE supply output voltage and cu.rreDt
tlack the MASITR supply output voltage and
1. Set the power supplies to the TRACKING
PARAILEL mode by engaging both
TRACKING switches.
2, Set the o-30 v/4.5 v switch to the
(F30 V position, tbe MASTER A/V switch
to the V (voltage Eeteling) position, and
the SLAVE A/V switch to the A (current
meteling) position. Output vottage wiU
now be read f!o@ the I|ASTER LED Die
day. Output culrent is exactly doubl€
the value lead from the SLAVE LED Dis-
play (because each supply is providing
tbe saBe ahount of curlent).
3, Because both voltage and cuirent of the
SLAVE supply tlack the MASTER supply,
the r]Iaxibum cr.EreDtand goltaee ale set
usiog tbe MASTER controls. iJsiag the
MASTER supply output jacks, follow the
iDstluctions {o! "Setting Cullent Limit'
CINDEPENDENT
USE OF "MASTER" OR
'SLAVEI SUPPLY palaglaph of this sec-
tion). RerDeEber that the actual current
output at the MASTER supply output
jacks is double the leading oD the SLAVE
rcD Display.
Adjust tbe output voltage to the desiled
level usidg the UASTER VOLTAGE con-
t!ols.
Turn off the powe! supply and the
equipEent to be powered during hook-up.
Connect tle positive polality of tbe de-
vice beiDg poweled to the led (+) te!-
E:inal of tbe MASTER powe! supply.
Connect the negative polarity of the de-
vice b€irg liowered to the black (-) ter-
minal of the MASTER powe! supply.
Fig. 9 iliustlates the grounding possibit-
ities when used in the TRACKING
PARAIIEL mode.
a. If t}te negative polality of tbe
equiploent or cilcuit being powered
is also the chassis or comloon, it
tDay be glounded to eatth by
strapping the biack (-) terminal to
the green (GND) telminal as shown
in Fig. 9A.
b, SiEilarly, the positive polarity can
be gloulded by stlapping the led (+)
terminal to th€ gleen (cND) te!-
minal as shown in Fig. 98.
c. If an ealth ground leference is not
require4 the corfiglration of Fig.
9C Day be used. The scheme rn
Fig. 9C should also be used where it
is not known v,/hether the chassrs rs
common with eithe! the positive o!
negativ€ troIarity.
d. II the chassis o! coErDon of rne
equipment being powered is sepa-
rate from both the positive and
negative polarity power inputs, use
the connection
shotrh
in Fig. 9D.
8,
7.
6.
l6
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