Agilent Technologies 1147A Manuale utente

Agilent 1147A 50 MHz

Current Probe

User’s Guide

Publication number 01147- 92007

March 2012

For Safety information, Regulatory

information, and publishing information, see

the pages at the end of this book.

©Copyright Agilent Technologies 2000-

1147A 50 MHz Current Probe

Introduction

The 1147A is a wide- band, DC to 50 MHz, active current probe.

The probe features low noise and low circuit insertion loss. The

intelligent interface makes the probe ideal for use with the

InfiniiVision and Infiniium products using the AutoProbe interface.

This unique probe interface makes current measurements as

simple as those made with the active voltage probes.

The 1147A has two operating regions that provide a wide, flat

frequency response. In the DC to low frequency AC region, the

probe operation is based on the negative feedback of the amplifier

system that includes the thin film Hall element as a detector. In

the high frequency region, the probe operates as a current

transformer.

The 1147A is ideal for acquiring high transient time signals such

as those found in Motor Controllers, in Switching Power Supplies,

and in Current Amplifiers driving inductive loads.

In order to use this product effectively and to ensure a long

operational life, read this User’s Guide carefully and retain it for

future reference.

Features

• Highly accurate current detection

• Split- core construction allows easy circuit connection

• Broadband frequency characteristics DC to 50 MHz

• Connects directly to InfiniiVision and Infiniium scope with 1 MΩ

AutoProbe interface

• Easy to degauss and offset zero calibration

• Easy protect function at excessive input

Inspection

When the unit is delivered, check and make sure that it has not

been damaged in transit. If the unit is damaged, or fails to operate

according to the specifications, contact your dealer or Agilent

representative.

Supplied accessories:

•User’sGuide

•Carryingcase

Contents

Note on Safety 4

Safety Symbols 4

Safety Considerations 5

Description of Parts 7

Characteristics and Specifications 9

Measurement Characteristics 9

Power Supply Characteristics 10

Mechanical Characteristics 10

Environmental Characteristics 10

Measurement Procedure 12

Preparations for Measurement 12

Demagnetization and Zero Adjustment 13

Measurement Procedure 13

Service Strategy 17

To return the Probe to Agilent Technologies for Service 17

Calibration Testing Procedures 18

Test Equipment Required 18

Preliminary procedure 18

(1) AC Accuracy 19

Calibration Test Record 20

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.

Indicates DC (Direct Current) or AC (Alternating

Current).

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

Safety Considerations

Only trained service personnel who are aware of the hazard involveds

(for example, fire and electric shock) should perform maintenance on the

instrument. When maintenance can be performed without power applied,

the power cord must be disconnected from the instrument.

To ensure safe operation and to obtain maximum performance from the

unit, observe the cautions listed below.

• To avoid short circuits and accidents that could result in injury or

death, use the 1147A only with power lines carrying 300 V or less.

• When conductors being measured carry in excess of the safe voltage

level (SELV- E) and not more than 300 V, to prevent short circuits and

electric shock while the core section is open, make sure that conductors

to be measured are insulated with material conforming to (1)

Overvoltage Category I, (2) Basic Insulation Requirements for Working

Voltages of 300 V, and (3) Pollution Degree 2. Never use this sensor

on bare conductors, the core and shield case are not insulated. If a

bare conductor is inevitable to be measured, make sure that the power

to the wire must be turned off, when opening the jaws of the probe

to insert or remove the bare wire so that 300V CAT I is always satisfied.

• Avoid damaging the cable insulation surfaces while taking

measurements.

• This instrument is only made for use with the Infiniium. Do not plug

the probe into any interface other than the AutoProbe interface, of

which Infiniium has a protective earthing with double- insulation

construction.

• Take the following precautions to ensure that the Infiniium does not

form a bridge between the probe and any hazardous live part.

1Isolate the AutoProbe interface to which the probe is connected

from other AutoProbe interfaces using basic insulation conforming

to the overvoltage category, working voltage, and pollution degree

requirements of the circuit being tested.

2If basic insulation requirements cannot be met between the

AutoProbe interface to which this unit is connected and other

AutoProbe interfaces of the measuring instrument, make sure that

the voltage input to the AutoProbe interfaces does not exceed the

safe voltage level (SELV- E).

3Read and observe all warnings and precautions relating to electrical

safety for the Infiniium.

• Refer to the following standards regarding the meanings of underlined

terms.

IEC61010- 1

IEC61010- 2- 031

IEC61010- 2- 032

WARNING

DANGER

• To prevent electric shock, do not allow the unit to become wet and

do not use the unit when your hands are wet.

• Do not subject the unit to vibrations or shocks during transport or

handling. Be especially careful to avoid dropping the unit.

• Do not store the unit where it will be exposed to direct sunlight,

high temperature, high humidity, or condensation. If exposed to such

conditions, the unit may be damaged, the insulation may deteriorate,

and the unit may no longer satisfy its specifications.

• Before using the unit, inspect it and check the operation to make

sure that the unit was not damaged due to poor storage or transport

conditions. If damage is found, contact your dealer or Agilent

representative.

• This unit is not constructed to be waterproof or dustproof, so do not

use it in a very dusty environment or in one where it will get wet.

• The sensor head is a precision assembly including a molded component,

a ferrite core, and a Hall effect element. It may be damaged if subjected

to sudden changes in ambient temperature, or mechanical strain or

shock, and therefore great care should be exercised in handling it.

• The matching surfaces of the sensor head are precision ground, and

should be treated with care. If these surfaces are scratched,

performance may be impaired.

• Do not bend or pull the sensor cable and power supply cable in order

to avoid damaging the sensor cables.

• Gently wipe dirt from the surface of the unit with a soft cloth moistened

with a small amount of water or mild detergent. Do not try to clean

the unit using cleaners containing organic solvents such as benzine,

alcohol, acetone, ether, ketones, thinners, or gasoline. They may cause

discoloration or damage.

• To avoid scratching the surfaces of the Hall effect elements, keep the

core section of the sensor closed, except when clamping it around the

conductor to be measured.

• Accurate measurement may be impossible in locations subject to strong

external magnetic fields, such as transformers and high-current

conductors, or in locations subject to strong external electric fields,

such as radio transmission equipment.

WARNING

CAUTION

NOTE

Description of Parts

1Opening lever

Operating lever for opening the sensor head. Always use this lever to

open the sensor head.

2Sensor head

This clamps the conductor being measured, and carries out the actual

current measurement. It is a precision assembly including a molded

component, a ferrite core, and a Hall effect element. It may be damaged

if subjected to sudden changes in ambient temperature, or mechanical

strain or shock. Care should be exercised when handing the sensor head.

3Demagnetizing switch (DEMAG)

This demagnetizes the core if it has been magnetized by switching the

power on and off, or by an excessive input. Always carry out

demagnetizing before measurement. The demagnetizing process takes

about one second. During demagnetizing, a demagnetizing waveform is

output.

4Zero adjustment dial (ZERO ADJ)

Use the zero adjustment dial to correct for the effect of a voltage offset

or temperature drift on the unit. The probe should be always be zeroed

after demagnetization.

5Coarse adjustment trimmer

This adjustment should only be carried out if the probe offset is outside

the range of the zero adjustment dial.

Current direction indication

"UNLOCK" indication

Sensor Terminator

Sensor cable

• The output of this unit is terminated internally. The high- impedance

such as 1 MΩinput impedance will be automatically selected on the

Infiniium, as the Terminator is plugged into the AutoProbe interface.

With an input impedance of 50 Ω, accurate measurement is not

possible.

• The probe output sensitivity 0.1 V/A will be automatically selected, as

the Terminator is plugged into the AutoProbe interface. With an

different output sensitivity, accurate measurement is not possible.

NOTE

Characteristics and Specifications

Measurement Characteristics

See note 1 below.

Probe Bandwidth DC to 50 MHz (-3 dB)

Accuracy (Probe Only)* ±1% of reading ±1mV

(DC or 45 Hz to 66 Hz)

Risetime2~ 7ns

Maximum current With InfiniiVision Series:

15Apeak(DC+ACpeak),15ADC,10Armscontinuous

Max. peak: 30A peak non-continuous (when two

probes are used)

30Apeak(DC+ACpeak),30ADC,24Armscontinuous

Max. peak: 32A peak non-continuous (when one

probe is used)

With Infiniium Series:

15A peak, 15 ADC, 10 Arms continuous, 30A peak

non-continuous (per each channel)

(Refer to frequency derating curve, Fig. 2)

Maximum peak current 50A (for Pulse Widths ~10µs)

Probe sensitivity 0.1V/A

Noise ~2.5mArms (with 20 MHz Bandwidth limiting)

Insertion impedance Refer to Fig. 3

Temperature coefficient ~±2% (0%C to 40%C)

Effect of external magnetic fields Equivalent to ~20mA (for a 400A/m magnetic field,

DC to 60 Hz)

Maximum circuit voltage 300VCatI(refertosafetyconsiderationsandproduct

compliances)

*This is a specification and is guaranteed at 23%C ±3%C (73%F ±5%F).

1. Requires 1MWtermination. Valid for 23%C ±3%C (73%F ±5%F), at least 30 minutes after power on.

2. Rise time is calculated as: Tr = 0.35/Bandwidth.

Power Supply Characteristics

Mechanical Characteristics

Environmental Characteristics

See note 3 below.

DC supply voltage requirements ±12Vdc ±1V

Probe power consumption Increases with measured current.

3 VA when measuring 15 A

Maximum cable diameter 5 mm (0.2 inch)

Sensor cable length 1.5 m (59 inches)

Power cable length 1 m (39 inches)

Dimensions Sensor:

Terminator:

175 mm x 18 mm x 40 mm

6.89 in. x 0.71 in. x 1.6 in.

28 mm x 81 mm x 24 mm

1.1 in. x 3.2 in. x 0.94 in

Weight 210 g (7.4 oz.)

Accessories supplied User's Guide, storage case, calibration certificate

Operating temperature range 0%C to 40%C (32%F to 104%F)

Storage temperature range -10%C to 50%C (14%F to 122%F)

Maximum relative humidity

(operating or storage)

80% (no condensation)

Vibration 10 to 55 Hz:

55 Hz:

30 min/axis

10 octave/min

Amplitude 0.3 mm

30 min/axis

Amplitude 0.3 mm

Acceleration 17.91 m/s2

Maximum Altitude 2000 m

3. This probe is intended for indoor use only.

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