B&K Precision 1550 User Manual

Model 1550 DC Power Supply with USB Charger Output 1-30V, 0-3.3A

Keep this manual in a safe place for quick reference at all times.

This manual contains important safety and operation instructions for correct use of the power
supply. Read through the manual and pay special attention to the markings and labels of this unit

and equipment to be connected.

Pay special attention to these notices used in this manual:

WARNING:

Failure to observe this warning may cause injury to persons and damage to power supply

or connected equipment.

CAUTION:

Failure to observe this warning may result in damage to equipment

and Improper functioning of the power supply.

WARNING:

1. Do not use this power supply near water.

2. Do not operate or touch this power supply with wet hands.

3. Do not open the casing of the power supply when it is connected to ac mains.

4. Refer all servicing to qualified service personnel only.

5. Before replacing the AC fuse at AC socket, find out and clear up the cause first.

6. Replace the AC fuse with the same type and rating as the original fuse.

CAUTION:

1. Use a grounded 3 pin AC source.

2. This unit is for indoor use only.

3. Do not operate or place this unit in a humid, dusty, in direct sunlight location or near any heat
source.

4. Before plugging into local AC mains, check with the rating label at the back of the unit.

5. Do not block any ventilation openings of the unit.

6. This unit must be used within the specified rating; regular excessive continuous loading may

cause damage to the power supply.

7. The gauge size of input power cable must be at least 0.75mm2and the total length of power

cable must not exceed 3m.

OPERA TION ENVIRONMENTAL CONDITION

 10-80% R.H.
 Maximum relative humidity 80% for temperature up to 31°C decreasing linearly to 50%

relative humidity at 40°C.

 Altitude up to 2000m
 Installation category : CAT 2
 Pollution degree: 2
 Mains supply voltage fluctuation up to ±10% of the normal voltage

INTRODUCTIONS

I. Using the 1550 switching mode power supply

The unit is a Micro-controller based DC power supply with a total supply capability of

100W. By using a digital + / - keypad operation control, you can set the output voltage

and current easily. It is a clean supply with quiet operation making it ideal for laboratory,
work shop or educational applications where work bench space is limited.
The 1550 has a USB charger output, constant current operation, tracking OVP,

floating ground design, small footprint, output on/off push button and a small form
factor.

II. Using the USB power output

The USB output is made to the USB power standard of 5VDC and 0.4A .
You can power up or charge your portables such as an I-Pod, MP3 Player or Cell
Phone* which have USB power connectors for getting dc power from a PC (Personal

Computer).

* - REMARKS:

NOT ALL THE CELL PHONE CAN BE CHARGED BY THE USB.

SOME NEW MODELS REQUIRE HIGHER VOLTAGE THAN THE 5V USB. PLEASE

REFFERENCE THE MANUFACTURES DOCUMENTATION OF THE DEVICE TO BE

CONNECTED FOR COMPATABILITY ISSUES.