Agilent Technologies N2775A User manual

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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.
© Copyright Agilent Technologies 2000-2001, 2005
All Rights Reserved.
N2775A Power Supply

2
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.

3
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

4
N2775A Power Supply
Note on Safety
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

5
N2775A Power Supply
Description of Parts
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
On
Power
switch
Vo l t a g e
window
12
34
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

6
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

7
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 box
Fuse
Pry the catch with a slot
head screwdriver or the like
and remove the fuse box.
selector

8
N2775A Power Supply
Characteristics
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)
± ±
± ±

9
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