EXTECH 382270

User's Guide
Model 382270
High Precision Quad Output
DC Power Supply
Introduction
Congratulations on your purchase of the Extech 382270 DC Power Supply. The Model
382270 can be used for many applications including bench testing, field service, hobby,
educational, maintenance, and telecommunication equipment use.
The Model 382270 is a high-precision DC regulated power supply with four outputs. Of which,
two are completely adjustable and two are semi-adjustable. The two adjustable outputs can
be configured for constant voltage or constant current. The two adjustable outputs can be
connected in parallel or in series. The 3 digit LED display indicates each of the two adjustable
outputs.
The two semi-adjustable outputs (one is 3~6.5V/3A and the other is 8~15V/1A) have good
stability and ripple factor, and reliable overload protection to protect the unit against
overloads or short circuits.
This power supply is shipped fully tested and calibrated and, with proper use, will provide
years of reliable service.
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382270 V2.1 5/09
Safety Information
Safety Precautions
To ensure safe operation of the equipment and eliminate the danger of serious injury due
to short-circuit (arcing), the following safety precautions must be observed.
•
Prior to connection of the equipment to the mains outlet, check that the available
mains voltage corresponds to the voltage setting of the equipment.
•
Connect the mains plug of the equipment only to a mains outlet with an earth
ground connection.
•
Do not place the equipment on damp or wet surfaces.
•
Do not subject the equipment to direct sunlight or extreme temperatures.
•
Do not subject the equipment to extreme humidity or dampness
•
Replace a defective fuse only with a fuse of the original rating. Never short circuit
the fuse or the fuse housing
•
Do not exceed the maximum permissible input rating.
•
Comply with the warning labels and other info on the equipment.
•
Do not insert metal objects into the equipment by way of the ventilation slots
•
Do not place water-filled containers on the equipment
•
Do not operate the equipment near strong magnetic fields (motors, transformer
etc.)
•
Do not subject the equipment to shocks or strong vibrations
•
Keep hot soldering irons away from the equipment
•
Allow the equipment to stabilize at room temperature before use
•
Do not modify the equipment in any way
•
Do not place the equipment face-down on any surface, table or work bench
•
All service and repair must be performed by qualified service personal.
Cleaning the meter housing
Prior to cleaning the meter housing, disconnect the mains plug from the power outlet.
Clean only with a damp, soft cloth and a commercially available mild household cleaner.
Ensure that no water gets inside the equipment to prevent possible shorts and damage to
the equipment.
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382270 V2.1 5/09
Power Supply Description
7
8
9 10
11
6
5
4
12
13
3
14
15
2
1
29
30
26 24 22
28 27 25 23
20
18 16
21 19
17
1.
POWER button
16.
Positive terminal CH 3
2.
Channel 4 Voltage adjustment
17.
CH1 / CH 3 display select button
3.
Channel 4 overload status LED
18.
Negative terminal CH 3
4.
Channel 2 Current adjust knob
19.
Positive terminal CH 1
5.
Constant Current / Voltage status
LED for CH 4
20.
SERIES / PARALLEL /
INDEPENDENT tracking select
button
6.
Channel 2 Voltage adjust knob
7.
Voltage output display (CH 2/4)
21.
Negative terminal CH 1
8.
Current output display (CH 2/4)
22.
GND terminal
9.
Current output display (CH 1/3)
23.
10.
Voltage output display (CH 1/3)
SERIES / PARALLEL /
INDEPENDENT tracking select
button
11.
Channel 1 voltage output adjust
knob
24.
Positive terminal CH 2
Constant Voltage / Current status
LED for Channel 1
25.
Output ON-OFF status LED
26.
Negative terminal CH 2
Output ON-OFF button
12.
13.
Current output adjust knob for
Channel 1
27.
28.
Positive terminal CH 4
14.
Channel 4 overload status LED
29.
Negative terminal CH 4
15.
Voltage output adjust knob for
Channel 3
30.
CH2 / CH 4 display select button
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382270 V2.1 5/09
Operation
Independent Connections (Channels 1 and 2, adjustable outputs)
Set the tracking switches (19) and (22) to the spring out position (INDEP). Set the Output
On/Off switch (27) to the On position.
Constant Voltage (CV) Mode
1.
Rotate the CC knob (4) for CH 2 or (13) for CH 1 to maximum and then turn on the
power supply.
2.
Adjust CV knob (6) or (11) for the desired output.
3.
The color of the CV/CC status LED (5) or (12) will turn green.
4.
Current Limiting Note: For CV outputs in general, the CC adjustment should be set
to maximum, but, for this unit, the current limiting protection point can also be set
arbitrarily. To do so:
a) Turn on power
b) Rotate CC adjustment counter-clockwise to minimum
c) Short the positive and negative terminals
d) Rotate the CC adjustment clockwise to the desired current-limiting
protection point.
Constant Current (CC) Mode
1.
Turn on the power supply.
2.
Rotate the CV knob (6) or (11) to maximum.
3.
Rotate the CC adjustment (4) or (13) to minimum
4.
Connect the required load.
5.
Rotate CC adjust knob clockwise to reach the desired current value.
6.
The color of the CV/CC status LED (5) or (12) will turn red.
Series Connection (Channels 1 and 2, adjustable outputs)
1.
Set the tracking switch (20) to the spring out position. Press in tracking switch (23).
2.
In Series mode, the slave output will strictly track the master output voltage when the
user turns the master voltage adjust knob (11). The output voltage in Series mode
can be set up to double the maximum voltage available in Independent mode (voltage
between terminals 19 & 26).
3.
Ensure that both channels’ negative terminals are NOT connected to case ground. If
they are, a short circuit will occur.
4.
When the two outputs are configured in Series, the voltage is controlled by the master
output knob, but the current adjustment for the two outputs is still independent.
Therefore, ensure that the CC adjust knob is rotated fully clockwise to maximum for
the Series circuit to work correctly.
5.
The user must physically short the negative terminal of the Master output with the
positive terminal of the Slaved output.
Parallel Connection (Channels 1 and 2 adjustable outputs)
1. Press in both tracking switch (19) and tracking switch (23).
2. In Parallel mode, the two outputs will always be the same for any setting of the master
voltage knob (11). The slave CC indicator (5) will switch on.
3. In Parallel mode the CC adjustment (4) for the slave is not active. The user must adjust
the CC for the master output. The current available in parallel mode is up to twice the
amount available in other modes.
4. The user must short the two positive terminals.
5. The user must also short the two negative terminals.
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382270 V2.1 5/09
Specifications
Range Specifications
Output1
(CH1)
Output2
(CH2)
Output3
(CH3)
Output4
(CH4)
0~30V/0~5A
0~30V/0~5A
3~6.5V/3A
8~15V/1A
Electrical Specifications
Input voltage: 110~127VAC±10%; 220~240VAC±10% (switchable)
Output voltage and current: See table above
Line regulation:
For Two adjustable outputs:
4
CV:
≤ 1 x 10¯ + 3mV
CC
≤ 2 x 10¯ + 3mA
3
Two semi-adjustable outputs: ≤ 5mV
Load regulation:
Two adjustable outputs:
4
CV
≤ 5 x 10¯ + 5mV
CC
≤ 2 x 10¯ + 5mA
CH3
≤30mV
CH4
≤15mV
3
Ripple and noise:
Two adjustable outputs:
CV
≤ 1mV rms
CC
≤ 3mA rms
Fixed output: ≤ 2mV rms
Protection: current-limit
Display accuracy:
Volt-indication: LED ± (0.5%rdg+2 digits)
Amp-indication: LED ± (0.5%rdg+2 digits)
General Specifications
Display: Four 3-digit color-coded LED displays and four status LED lights
Dimensions: 10.2 x 6.3 x 14.6" (260 x 160 x 370mm) (W x H x D)
Weight: 26.4lbs. (12 kg)
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382270 V2.1 5/09
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
Up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Copyright © 2009 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
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