Advance Instruments PP3, PP3R Instruction Manual

Twin Stabilised

D.C. Supplies

PP3& PP3R

Instruction Manual

Twin Stabilised

D.C. Supplies
P P3 & PP3R

Instruction Manual

ADVANCE E LECT RONI CS L IM I T ED

INSTRUMENT DIVISION

ROEBUCK ROAD, H A iN AU lT , ILFORD. ESSEX, ENG LAND
TELEPHONE HAIN AULT 4444 TELEGRAPH ATT E N U ATE, ILFORD

Publication I 209

I l*i [PIia! m I ngl.iiKi

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Co ntents

S E C T IO N I In tr o d u ctio n 3
SE C T I O N 2 Spe cific atio n 4
S E C T IO N 3 O per at i n g In stru c t i o ns 5

3.1 Preparations for Use 5

3. 2 Metering 5

3.3 Overload 5

3.4 Four Terminal Network 5

3.5 Fuses 5

S E CT I O N 4 C ir c ui t D e sc rip t io n 6

4.1 General 6

4.2 Stabilising Circuit 6

4.3 Overload Cut-out 6

S E CT I O N 5 M a in t e n a n c e 7

5.1 General 7

5.2 Re-alignment of Voltage Calibration 7

5.3 Adjustment of Overload Cut-out 7

S E CT I O N 6 C o m po n en t s Li s t 9
SE CT I O N 7 Fa c t o ry Se r v i ce 10

Illu stra tio ns

Fig. I Componen t Location Diagram X
Fig. 2 Circuit Diagram 9

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1 1 ntrod uc ti on

Th e T win Stabilised D.C , Su pply PP 3 is a por table

instru ment prov iding two i ndep enden t an d floating
stabilised d.c. supplies, each variabl e from 0 to 30V at

1A m axim um . Th e tw o supplies can be used se parately,
or connec ted in series to pr ovide a max im um o utp ut of
60V at 1A.

In bo th sections of the instru ment, the rang e is covered

in three o verla ppin g no min al 10V steps, wit h fine

adjus tment pr ovided by a variable co ntrol directly

calibrated in volts. A voltm eter and a dual -ran ge

am me ter are pro vided, an d these can be switched
indep endently to m oni tor eith er section.

Both sections are p rovided with f our ter minal o utp ut
netwo rks wh ich virtually elim inate the effect of

resistance in the c onnec ting leads to the load.
Overl oad p rotection is effected by an e lectronic circuit

which affords co mplete protec tion agai nst b oth
progressive a nd sud den short circuit overloa ds. This
circuit is reset from the fro nt panel by o per atio n o f the

o n /o f f switch.

Th e instrum ent will oper ate from a.c. suppli es of 90 to

130V and 200 to 240V. Fuses ar e pro vided to protect
against bot h suppl y surges a nd in ternal c om pon en t
failure. Th e T win Stabilised D.C . Sup ply PP 3R is a

19-inch rack m ou ntin g version of the PP3. Th e specifi
cation is identical to the PP3 but the P P3 R has the

addition al facility o f the ou tp ut being avai lable o n a

10-way ter minal block at the re ar of the instrum ent.

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