Extech Instruments 382270 Manuel utilisateur

User's Guide

Model 382270

High Precision Quad Output

DC Power Supply

382270 V2.1 5/09

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.

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.

382270 V2.1 5/09

Power Supply Description

78 910

2224

30 23

1. POWER button

2. Channel 4 Voltage adjustment

3. Channel 4 overload status LED

4. Channel 2 Current adjust knob

5. Constant Current / Voltage status

LED for CH 4

6. Channel 2 Voltage adjust knob

7. Voltage output display (CH 2/4)

8. Current output display (CH 2/4)

9. Current output display (CH 1/3)

10. Voltage output display (CH 1/3)

11. Channel 1 voltage output adjust

knob

12. Constant Voltage / Current status

LED for Channel 1

13. Current output adjust knob for

Channel 1

14. Channel 4 overload status LED

15. Voltage output adjust knob for

Channel 3

16. Positive terminal CH 3

17. CH1 / CH 3 display select button

18. Negative terminal CH 3

19. Positive terminal CH 1

20. SERIES / PARALLEL /

INDEPENDENT tracking select

button

21. Negative terminal CH 1

22. GND terminal

23. SERIES / PARALLEL /

INDEPENDENT tracking select

button

24. Positive terminal CH 2

25. Output ON-OFF status LED

26. Negative terminal CH 2

27. Output ON-OFF button

28. Positive terminal CH 4

29. Negative terminal CH 4

30. CH2 / CH 4 display select button

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.

382270 V2.1 5/09

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.

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:

CV: ≤1 x 10¯4+ 3mV

CC ≤2 x 10¯3+ 3mA

Two semi-adjustable outputs: ≤5mV

Load regulation:

Two adjustable outputs:

CV ≤5 x 10¯4+ 5mV

CC ≤2 x 10¯3+ 5mA

CH3 ≤30mV

CH4 ≤15mV

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)

382270 V2.1 5/09



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

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

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.

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