Global Specialties 1505 - Manual (Page 6)

SECTION - 3
DESCRIPTION
INPUT AND OUTPUT TERMINATION :
The unit works from 115VAC, 47Hz to 63Hz single phase supply
with internal tap selection facility. The input is provided through a
mains cable with a plug. The use of a three core cable enables the
cabinet of the unit to be properly grounded.
The unit as shipped from factory is wired for 115V AC single phase
supply
Output is provided on two seperate sockets through a output voltage
range selector switch. In one position, it provides 0 -130 VAC at 4A
max whereas in other position,it provides 0-260VAC at 2Amp.max.
METERING :
One 3-digit DPM is provided to measure
1)
Output voltage
2) Leakage current
3) Load current
Meter function is switch selectable
ON-OFF SWITCH AND FUSE :
The power ON-OFF switch is located on the front panel. The fuses
(Input & Output) are also located on the front panel. The fuse ratings
are clearly marked.
PANEL CONTROLS :
A voltage adjust knob allows adjustment of output AC voltage and
the output voltage selector switch selects the output AC voltage
range so as to provide 0 -130VAC isolated output only on American
socket while 0 - 260VAC isolated output only on European socket.
Three meter function push switches are provided to select the
Leakage Current or Output Voltage or Output Current (mA,V & A
respectively.) to be displayed on the meter.
CIRCUIT DESCRIPTION :
The circuit uses a step down tranformer to provide step down supply
to a single phase variable autotrans former to obtain an output
voltage variable from 0 to 130VAC. This is followed by a triple
shielded isolation transformer which provides an output voltage from
0-130VAC or 0-260VAC electrostatic and galvanic isolation.
Multiple shielding technique reduces primary to secondary static
coupling to below 0.0005pF. The DC isolation is over 1000 M Ohms.
3
SECTION - 7
PART LIST
PCB Components GLOBAL 1505 / 06 SW - 0396
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Reference Designator Part Description
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RESISTORS
R1
1.5K, ¼W ±5% MFR
R2 120E, ¼W ±5% MFR
R3 10K, ¼W ±5% MFR
R4 62K, ¼W ±5% MFR
R5 10 ohm, ¼W ±5% MFR
R6 220 ohm, ¼W ±5% MFR
R7 Not Used
R8 10K, ¼W ±5% MFR
R9 100K, ¼W ±5% MFR
R10 10M, ¼W ±5% MFR
R11 4.7K, ¼W ±5% MFR
R12 10K, ¼W ±5% MFR
R13 1.2M, ¼W ±5% MFR
R15 470K, ¼W ±5% MFR
CAPACITORS
C1
1µf, 50V ±20%, ELEC
C2 1µf, 50V ±20%, ELEC
C3 220µf, 16V ±20%, ELEC
C4 220µf, 50V ±20%, ELEC
C5 0.1µf, 100V ±10%, MP
C6 0.22µf, 100V ±10%, MP
PRESETS
PR1
100E Horizontal
PR2 100E Horizontal
PR3 100E Horizontal
PR4 10K Horizontal
DIODES
CR1
1N4007
CR2 1N4148
CR1 1N4148
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