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A

User’s Guide

Publication number N2775-92002

September 2005

For Safety information, Warranties, Regulatory information, and publishing information,

see the pages of this book.

N2775A Power Supply

N2775A Power Supply introduction

This unit is a special-purpose power supply for the N2774A Current

Probe. Two power supply receptacles are provided on the front panel to

be used simultaneously.

Contents

Note on Safety 4

Safety Symbols 4

Description of Parts 5

External View 5

Power Supply Receptacle 5

How to Change the Power Supply Fuse and the Power Supply Voltage 6

Characteristics 8

Electrical 8

General 8

Environmental 8

Measurement Procedure 10

Preparations 10

Measurement Procedure 10

Safety Considerations 11

Preparations 11

Service Strategy 12

To return the Power supply to Agilent Technologies for Service 12

Performance Verification 13

Test equipment required to complete performance verification 13

Preliminary Procedure 14

Measurements to be made and recorded in Performance Test record 15

Performance Test Record 16

N2775A Power Supply

Note on Safety

This equipment is designed according to IEC 61010-1 Safety Standards, and has

been tested for safety prior to shipment. Incorrect measurement procedures

could result in injury or death, as well as damage to the equipment. Please read

this manual carefully and be sure that you understand its contents before using

the equipment. The manufacturer disclaims all responsibility for any accident or

injury except that resulting due to defect in its product

Safety Symbols

This User’s Guide provides information and warnings essential for operating this

equipment in a safe manner and for maintaining it in safe operating condition.

Before using this equipment, be sure to carefully read the following safety notes.

The following symbols are used in this User’s Guide to indicate the relative

importance of cautions and warnings.

Caution refer to accompanying documents.

Denotes a ground terminal.

Denotes a fuse.

Indicates AC (Alternating Current).

Indicates power on.

Indicates power off.

Indicates that incorrect operation presents extreme danger

of accident resulting in death or serious injury to the user.

Indicates that incorrect operation presents significant

danger of accident resulting in death or serious injury to the

user.

Indicates that incorrect operation presents possibility of

injury to the user or damage to the equipment.

Denotes items of advice related to performance of the

equipment or to its correct operation.

WARNING

DANGER

WARNING

CAUTION

NOTE

N2775A Power Supply

Description of Parts

External View

Power Supply Receptacle

The pin assignment of the receptacle is shown in the following.

MEASURING

AND

TESTING

EQUIPMENT

37FN

Power indicator

Power supply receptacles

Front view Rear view

Grounding terminal

Fuse holder

Power supply

connector

Off

Power

switch

Vo l t a g e

window

1: Not used

2: Ground

3: -12V

4: +12V

Manufacturer: LEMO

Model: ERA. 0S. 304. CNL

This receptacle is for the

following plug:

Manufacturer: LEMO

Model: FFA. 0S. 304. CNAC42Z

N2775A Power Supply

Description of Parts

How to Change the Power Supply Fuse and the Power Supply Voltage

The power supply fuse for the N2775A unit, and the power supply voltage

selector, are housed in the power input socket on the rear panel.

•In order to prevent electric shock, always disconnect the power cord from

the receptacle before replacing the fuse.

• Always replace the fuse with a new fuse of the specified rating. Never use a

fuse of other than the specified rating, and never short circuit the fuse holder

to prevent an accident resulting in injury or death.

• 100 V, 120 V: F1.0 AL/250 V20 mm x 5 mm dia.

• 220 V, 240 V: F0.5 AL/250 V20 mm x 5 mm dia.

To change the fuse, or to alter the power supply voltage setting, use the following

procedure with reference to the figures.

1Turn the power switch off, and then remove the power cord.

2Using a slot head screwdriver or the like, bias sideways the catch which

holds the fuse box into the power input socket as shown in the figure,

and then remove the fuse box. When changing the power supply fuse:

3Change the power supply fuse for a new one of the same rating and

specification. When altering the power supply voltage setting:

1Remove the voltage selector from the fuse box, and reinsert it after having

rotated it so that the desired new power supply voltage setting appears

in the display window as shown in the figure. Be sure to recheck the

setting value shown in the window. (The voltage display is upside down

and backwards.).

2Change the power supply fuse for a new one whose rating and

specification are appropriate for the new power supply setting.

4Replace the fuse box by reinserting it into the power input socket.

WARNING

N2775A Power Supply

Description of Parts

The following illustrations show how to change the power supply fuse and the

power supply voltage:

When changing the

power supply fuse:

When altering the

power supply voltage

Voltage

Remove the voltage selector, rotate it so

that the figures which will appear in the

display window represent the voltage of

the power supply which will now be

used, and then replace it.

220

100

120

240

220

100

120

240

AC socket

Screwdriver

Fuse box

Voltage

Fuse box

Fuse

Pry the catch with a slot

head screwdriver or the like

and remove the fuse box.

selector

N2775A Power Supply

Characteristics

Electrical

General

Environmental

Output voltage DC 12 V 1 V (400 mA total load)

Rated output current 400mA (sum total of channels and all output voltages)

Ripple voltage 3 mVrms or less (at rated output current)

Load coefficient Within output voltage limits indicated above for

current output in the range 0 to 400 mA

Temperature

coefficient

Within output voltage limits indicated above for

ambient temperature in the range 0 oC to 40 oC (32 oF

to 104 oF )

Line regulation Within output voltage rating of DC 12 V 1 V for the

rated power supply voltage of 10 %

Rated supply voltage 100 VAC , 120 VAC , 220 VAC or 240 VAC

Rated supply

frequency

50/60 Hz

Maximum rated power 12 VA

Compatible sensors N2774A Current Probe

Number of receptacles 2

Weight Approx. 1.1 kg or 38.8 oz

External dimensions Approx. Width 73 mm (2.87"), Height 110 mm (4.33")

Depth 186 mm (7.32")

Accessories Power cord, User’s Guide, and Spare fuse:

100 V, 120 V: F1.0 AL/250V, 20 mm x 5 mm dia. or

220 V, 240 V: F0.5 AL/250 V, 20 mm x 5 mm dia.

Operating

temperature and

humidity range

0 oC to 40 oC (32 oF to 104 oF ), 80 %rh or less (no

condensation)

Storage

temperature and

humidity range

-10 oC to 50 oC (14 oF to 122 oF ), 80 %rh or less (no

condensation)

± ±

N2775A Power Supply

Characteristics

Altitude Operating: up to 4,600 m (6,500 ft )

Non-operating: up to 15,300 m (50,000 ft)

Vibration Operating:

Random vibration 5-500 Hz, 10 minutes per axis,

0.3g(rms)

Non-operating:

Random vibration 5-500 Hz,10 minutes per axis,

2,41g(rms);

resonant search 5-500 Hz, swept sine, 1 octave/minute

sweep

rate, (0.75 g), 5 minute resonant dwell at 4 resonances

per axis

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