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Isolated!Variable!AC!Line!Supply!
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1504
Instruction!Manual!
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Revision:!11/2010
TABLE OF CONTENTS
INTRODUCTION PAGE 1
INITIAL INSPECTION PAGE 2
SPECIFICATIONS PAGE 3
DESCRIPTION PAGE 4
OPERATING INSTRUCTIONS PAGE 5
PART LIST & SCHEMATICS PAGE 6
CIRCUIT DIAGRAM PAGE
SERVICE & WARRANTY PAGE
INTRODUCTION
ISOLATED VARIABLE AC LINE SUPPLY : M O D E L 1 5 0 4
The 1504 Isolated Variable AC Source cum leakage current tester is designed
for modern electronics laboratories which need a clean, electrostatically and
galvanically isolated variable line supply.
The unit is designed to provide isolated output variable from 0 to 150 V AC/4
Amps Max. The output voltage and load current can be monitored on a 3 digit
DPM. The variable isolated output voltage capability makes this unit very
convenient to use for either incoming or outgoing quality control testing. It is also
useful in servicing or circuit design work application, when checking operation
at voltage higher or lower than normal. The unit consists of a super isolation
transformer which is triple shielded from the line to protect against shock
hazards.
The 1504 can measure power line leakage current by means of a probe and a
switch selected range of the output DPM. It can measure leakage currents upto
9.99 mA.
The unit is overload protected by means of an input fuse.
INITIAL INSPECTION
Before shipping, the 1504 power supply has been tested thoroughly and found
free of mechanical and electrical defects. As soon as it is unpacked, inspect
for any damage that may have occurred during transit. Particular attention
should be paid to the meters. Also check the packing material for any signs of
severe stress (may be indicative of internal damage). Save all the packing
material. Read the INSTRUCTION MANUAL carefully for any unusual input
requirements and if found so, arrange to comply with the same.
SPECIFICATIONS
OUTPUT VOLTAGE : 0 to 150 VAC
INPUT VOLTAGE : 115 VAC ±10%
INPUT FREQUENCY : 47 to 63 Hz.
METERING : 3 digit DPM to read
1) Output Voltage.
2) Load Current and
3) Leakage current upto 9.99 mA.
METER ACCURACY : ± 3 counts.
OUTPUT-LINE ISOLATION : Capacitive coupling less than
0.0005 pF.
LINE & OUTPUT LEAKAGE : Less than 10 mA.
NOISE REJECTION : Better than 120 db (common
mode noise).
DIMENSIONS : 298 mm(W) x 133 mm(H) x 270 mm(D)
WEIGHT : 16 kgs.
DESCRIPTION
INPUT AND OUTPUT TERMINATION :
The unit works from 115 V AC/47-63 Hz single phase supply. The input is
provided through a mains cable with a three pin plug. The use of a three core
cable enables the cabinet of the unit to be properly grounded.
Output is provided on a three-pin socket and is clearly marked 0-150 V AC/4
Amps max.
METERING :
One 3-digit DPM is provided to measure
1) Output voltage
2) Leakage current and
3) Load current
Meter function is switch selectable
ON-OFF SWITCH AND FUSE :
The power ON-OFF switch is provided on the front panel. Fuse is also provided
on the front panel. Fuse rating is clearly marked.
PANEL CONTROLS :
A voltage adjust knob allows adjustment of output AC voltage from 0 to 150 V
AC. Three meter function push switches are provided to select the quantity to
be displayed on the meter.
CIRCUIT DESCRIPTION :
The circuit uses a single phase variable autotransformer to obtain an output
voltage variable from zero to 150 V AC max. This is followed by a triple shielded
isolation transformer which provides electrostatic and galvanic isolation.
Multiple shielding technique reduces primary to secondary static coupling to
below 0.005pF. The DC isolation is over 1000 M Ohms. Line leakage current
to load is 10mA or less.
OPERATING INSTRUCTIONS
TURN ON PROCEDURE :
a) 1504 as Isolated Variable Ac Supply.
Set output voltage to ‘O’ volt by turning the knob to minimum position. Depress
push switch marked ‘V’.
Set power on switch. Adjust the voltage control till the desired voltage is
indicated on the 3-digit DPM. Connect the load at the output. Depress push
switch marked A. The DPM will now read the load current. The total load current
should not exceed 4 Amps for continuous operation.
b) 1504 as Line Leakage Tester.
Set output voltage to ‘O’ volt by turning the knob to minimum position. Depress
push switch marked ‘V’. Set power on switch. Adjust the voltage control till the
desired voltage at which leakage current is to be measured is available at the
output socket, and is indicated on the DPM.
Depress push switch marked ‘mA’. Connect unit under test (U. U. T) to output
socket. Connect U. U. T. earth to banana socket marked ‘leakage test’. The
DPM now reads the leakage current of the unit under test in milliamperes.
PART LIST & SCHEMATICS
This section contains information for ordering replacement parts. Part list
describes parts by reference designator used in circuit diagram & provides the
following information :
a) Reference Designators, refer to Table 4.1
b) Description Refer to Table 4.2
c) Location indicator Refer to Table 4.3
ORDERING INFORMATION
To order replacement parts address order or enquiry to your local agent or
ourselves. Specify following information for each part : Model complete serial
number, Part number Circuit Reference Designator and Description. To order
part not listed in Table 4.4 give complete description of the part, its function, and
its location.
TABLE 4.1 REFERENCE DESIGNATOR
C CAPACITOR IC INTERGRATED CIRCUIT
CR DIODE F FUSE
Q TRANSISTOR J JACK, CONNECTOR
R RESISTOR L INDUCTOR
SW SWITCH Z ZENER DIODE
TX TRANSFORMER PR PERSET
TABLE 4.2 DESCRIPTION ABBREVIATION
CD CERAMIC DISC MFR METAL FILM RESISTOR
MP METALISED POLYESTER CFR CARBON FILM RESISTOR
TAN TANTALUM HVR HIGH VOLTAGE RESISTOR
SM SILVER MICA K KILO
ML MULTILAYER M MEGA
ELEC ELECTROLYTIC E OHM
mF MICRO FARAD mH MILLI HENRY
pF PICO FARAD mH MICRO HENRY
WW WIRE WOUND MO METAL OXIDE
TABLE 4.3 LOCATION KEY
LOCATION NO
DIGITAL PANEL METER SWITCH PCB (909A-DPM-SW-0594) 1
RECTIFIER PCB (GLB-1504-0694) 2
DIGITAL PANEL METER PCB (DPM-0893) 3
SERVICE AND WARRANTY INFORMATION
FACTORY SERVICE AND REPAIR
Global Specialties will service and repair this instrument free of charge for a
period of one full year, subject to the warranty conditions stated below.
To obtain a return merchandise authorisation (RMA) required for all returns,
phone our Customer Service Department for a RMA and all shipping instructions
:
Tel. 800-572-1028 or write :
GLOBAL SPECIALTIES
22820 Savi Ranch Parkway
Yorba Linda, 92887
TEL.: (203) 466 6103
FAX.: (203) 468 0060
Email : eblaur@aol.com
WARRANTY
Global Specialties warrants this device to be free from defective material or
workmanship for a period of one full year from the date of original purchase.
Global Specialties under this warranty is limited to repairing the defective
device when returned to the factory, shipping charges prepaid, within one full
year from the date of original purchase.
Units returned to Global Specialities that have been subject to abuse, misuse
damage or accident, or have been connected, installed or adjusted contrary to
the instructions furnished by Global Specialities, or that have been repaired by
unauthorized persons will not be covered by this warranty.
Global Specialities reserves the right to discontinue models, change
specifications price or design of this device at any time without
obligation whatsoever.
The purchaser agrees to assume all liabilities for any damages and/or bodily
injury which may result from the use or misuse of this device by the purchaser,
his employees or agents.
This warranty is in lieu of all other representations or warranties expressed or
implied and no agent or representative of Global Specialties is authorized to
assume any other obligation in connection with the sale and purchase of this
device.
GLOBAL
SPECIALTIES
Specifications subject to change without notice.
incurring any
Ò and TM trademarks are the property of INTERPLEX ELECTRONICS, INC, New Haven,
CT, 1994.
CASE DISASSEMBLY AND ASSEMBLY
WARNING
Potentially lethal AC power is present whenever the line cord is
plugged into the AC outlet, even when the power switch is OFF. Always
disconnect the power cord when opening the case. Avoid touching the fuse
post on the inside of the unit.
Should access to the inside of the unit be required, proceed as follows :
1. Remove the line cord from the AC outlet before disassembly.
2. To disassemble the case, remove the screws that secure the cover to the
chassis and lift the cover off.
3. To reassemble the case, place the cover on the chassis, line up the screw
holes, and replace the screws.
MAINTENANCE AND RECALIBRATION
ADJUSTMENTS
All circuitry is factory-calibrated. No user adjustments are required.
FUSE REPLACEMENT
Remove the line cord from the AC outlet before changing fuses. Using a
screwdriver, remove the fuse holder cap. Replace the fuse with another fuse of
identical type and current rating. Replace the fuse holder cap.
RESISTORS : All resistors are 0.25W, +/- 5%, MFR unless otherwise specified.
Reference Part Location Reference Part Location
Designator Descrip- Key Designator Descrip- Key
tion tion
R1 1.3K 1 R1 39K 3
R2 91E 1 R2 470K 3
R3 1K 1 R3 1M 3
R4 7.5K 1 R4 Not used 3
R5 SHORT- 1 R5 2.4K 3
ING LINK
R6 SHORT- 1 R6 2.7K 3
ING LINK
R7 SHORT- 1 R7 39K 3
ING LINK
R1 10k 2 R8 8.2K 3
R2 Not used 2 R9 100E 3
R3 10M 2 R10 12K 3
R4 100K 2 R11 20K 3
R5 8.2M 2 R12 100E 3
R6 4.7K 2 R13 330E 3
R7 10K 2 R14 330E 3
R8 470K 2
PRESETS
PR2 100E 1 PR1 100K 2
PR3 250E 1 VR1 2.2K 3
Reference Part Location Reference Part Location
Designator Descrip- Key Designator Descrip- Key
tion tion
CAPACITORS (CD +/- 20%, TAN +/- 10%, SM +/- 5%, ELEC +/- 20% unless
otherwise specified)
C1 220mf 2 C4 0.47mf 3
ELEC MP100V
50V
C2 220mf 2 C5 0.22mf 3
ELEC MP100V
16V
C3 0.1mf MP 2 C6 10mf EL- 3
100V EC 50V
C4 1mf ELEC 2 C7 0.1mf 3
50V MP100V
C5 0.22mf MP 2 C8 0.1mf 3
100V CD 50V
C6 1mf ELEC 2 C9 Not 3
50V Used
C1 220pf CD 3 C10 470mf 3
100V ELEC
25V
C2 0.1mf MP 3 C11 2.2mF 3
100V ELEC
50V
C3 0.01mf CD 3
100V
Reference Part Location Reference Part Location
Designator Descrip- Key Designator Descrip- Key
tion tion
DIODES
D1 1N4148 2 D1 1N4148 3
D2 1N4148 2 D2 1N4148 3
CR1 1N4003 1 D3 TO D6 1N4003 3
TRANSISTORS/FET’S
Q1 TL430 3 Q3 LM7805 3
Q2 MPSA12 3
IC’S
IC1 ICL 7660 2 IC3 CA3160 2
IC2 LM 741 2 U1 LM7107
LED’S
LED1 3mm 3 LED2 3mm 3
GREEN GREEN
FND’S
DS1 LT542 3 DS3 LT542 3
DS2 LT542 3 DS4 LT542 3
Reference Part Location Reference Part Location
Designator Descrip- Key Designator Descrip- Key
tion tion
SWITCHES
SW1 TO 4 Pole 1 SW4 1801 7
SW3 2WAY ON/OFF
TRANSFORMERS
T1 Isolation 6 T3 DPM 6
T2 Current 6 T4 0-120V/ 7
4A
Variable
FUSE
F1 8Amp 7
RELAY
RL1 2/P 2CO 1
6V/6A
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