Atec 3255B User Manual

Technical data sheet

Inductance Analyzers - 3255BL 3255B and 3255BQ

• Frequency ranges from 20 Hz to 1 MHz

• Fast measurement speed - up to 20

measurements per second

• 0.1% basic accuracy

• Up to 125 A of DC bias current

• Comprehensive measurement functions

• Straightforward intuitive operation

• Print test results

• GPIB control with LabVIEW™ driver

Completely characterize components with
comprehensive parametric tests

The 3255B range of inductance analyzers are able to
accurately characterise devices in a clear and simple manner.
The inductance analyzers are available in three versions
3255BL (200kHz), 3255B (500kHz) and 3255BQ (1 MHz).

At the design stage of component development it is very
important to analyse how components performs under
different operating conditions. This includes operation over a
range of frequencies, AC drive levels or DC bias currents.

The AC drive level can be set between 1 mV and 10 V. DC
bias current can be set from 1 mA to 1 A internally (optional).
Using the external 3265B range of DC Bias Units bias
currents can be set to a maximum of 125 A.

Specification summary

Measurement functions Z, Ø, L, C, Rac, Rdc, Q, D,

turns ratio

Frequency ranges 20 Hz to 200kHz (3255BL)

20 Hz to 500 kHz (3255B)

20 Hz to 1 MHz (3255BQ)

Basic accuracy 0.1%

Modes Impedance

Multi frequency
Bin handler (optional)

DC bias current 1 mA to 1 A - internal (optional)

Interface GPIB (option)
Measurement speed Up to 20 measurements/sec

Printed output of test results

Using the parallel Centronics interface the user can
directly print all test results for further analysis and
archiving.

In addition, via the optional GPIB interface, the instrument
can be controlled from a PC and results can be read back
for analysis and storage.

LabVIEW™ drivers are available on request or can be
downloaded from the web site, www.waynekerrtest.com,
providing a base from which a user can develop a specific
test application.

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Technical data sheet

Bin sort

The binning function allows component manufacturers to sort
components in up to ten bins. Sorting is carried out either by
absolute values or by percentage of values.

Component tests with up to 125 A DC bias
current

The 3255B and 3255BQ enable components to be measured
at up to 125 A when optional 3265B DC Bias Units are used.
Extended DC bias capability is also available with the 3255BL
which uses the 3265B/5A or 3265B/10A to extend the DC bias
current available to a maximum of 50A.

Up to five of the DC Bias Units can be used in parallel to
give a wide range of DC bias currents.

Internal DC bias is available as an option giving DC bias
currents from 1 mA to 1 A.

The 3265B has a number of safety and protection
features including a safety interlock system to protect
users against back EMFs. It is also fully protected
against over temperature, excess voltage drop and sense
lead failure.

3265B DC Bias Unit can deliver up to 25 A of DC bias current in steps of 0.025 A

SMD inductor tests up to 50 A

With the addition of the 1009 DC Bias Fixture DC bias
currents up to 50 A can be applied to an SMD inductor during
component test in order to evaluate the devices thoroughly at
operational bias currents. The fixture operates with one or two
3265B/25A Wayne Kerr DC bias units and a 3255B
Inductance Analyzer. If two 3265B/25As are used then the
optional 5-328-2005 high current lead set will be required.

Four rear panel mounted BNC connectors and two captive
high current cables ensure simplicity and ease of use with a
3265B.

Interchangeable component test carriers ensure that the 1009
test fixture may be used with a wide variety of different
devices. Blank carriers are available which enable device
specific test fixtures to be developed or alternatively a carrier
design and manufacturing service is available.

Stable component fixturing ensures high accuracy and
repeatable measurements. Enclosed fixtures, with safety
interlocks, minimises risk to operators.

1009 DC Bias Fixture enables currents up to

50 A to be applied to an SMD inductor

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Technical data sheet

Technical specifications

Operation modes

Impedance mode

Inductance (L), Impedance (Z), DC Resistance (Rdc) and
Capacitance (C).
Series or parallel equivalent circuit
Loss term: Quality factor (Q), Dissipation factor (D),
AC Resistance (Rac) and Phase Angle (Ø) Turns Ratio
Percentage difference mode and relative mode on major terms.

Multi-frequency mode

Measurement parameters and test conditions set using
measurement mode. Up to eight frequencies with absolute or
percentage limits on major term with PASS/FAIL indications.

Test conditions

Low level AC drive

For measurement of L + Q, Ls + Rs,
C, Z, Turns Ratio

Frequency ranges

20 Hz to 200 kHz (3255BL)
20 Hz to 500 kHz (3255B)
20 Hz to 1 MHz (3255BQ)

Steps

At least 800 frequency steps are available which may be selected
via the keypad or GPIB.
Basic accuracy of selected frequency ±0.01%

Drive level

Source impedance 50 Ω
1 mV to 10 V rms into open circuit
50 µA to 200 mA rms into short circuit
Automatic Level Control (ALC) maintains level applied to Device
Under Test (DUT) at ±2%, ±1 mV of set voltage or ±2% ±0.1 mA
of set current, reduces to ±4% below 100 Hz.

DC bias current (option)

1mA to 1A DC is available from internal, fast settling bias supply
over full frequency range.
Voltage compliance 14 V minimum
DC Accuracy ±2.5 % ±0.25 mA
Enabling DC bias inherently reduces measurement accuracy.
Safety interlock eliminates operator exposure to high currents.

DC resistance

Low test level of 100 mV minimises heating of the DUT
Short circuit current 10 mA.

Bin handler mode (option)

Sort to 1 of 10 bins using absolute or percentage limits.
Separate Pass/Fail output.
Up to 100 bin limit set-ups stored in non-volatile memory.
TTL interface to external bin handler via 25 way D type
connector.

Option /D1 (non-isolated)

Common 0 V. Bin outputs 0 to 5 V(nominal) with >10 mA
current sink capability.

Option /D2 (isolated)

Common 24 V input. Outputs 0 to 24 V with >10 mA current
source capability.

Measurement speeds

For Impedance, Turns Ratio, DC Resistance
4 speeds selectable for all functions: MAXimum, FAST,
MEDium and SLOW

Maximum for remote control. Up to 20 measurements per
second for test frequency >100 Hz. Selecting slower speeds
improves accuracy and display resolution.

Measurement ranges

R 0.05 mΩ to >2 MΩ
L 1 nH to >1000 H
C 0.01 pF to > 250 mF
Rdc 0.5 mΩ to 50 kΩ
Turns Ratio 100:1 to 1:100

Accuracy

L/C/Z/Turns Ratio ±0.1%
Q ±0.1% (Q+1/Q)
D ±0.001 (1+D2)
Rdc ±0.5% ±1mΩ
Note: Ranges and accuracy vary with measurement speed,
frequency and options chosen

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Technical data sheet

UK

USA

Fax: [phone]

General data

Input specification

Power supply
230 V AC ±10% or
115 V AC ±10% (selectable)
50 to 400 Hz
150 VA maximum consumption

Display

High contrast monochrome LCD
320 x 240 dot with back lighting.
Visible area 115 x 86mm.
Viewing angle 45°

Measurement connections

4 front panel BNC sockets
4-wire (Kelvin) measurements with screen at ground potential
Equivalent circuit symbols on screen

Remote control (option)

Conforms with GPIB IEEE-488.2 and SCPI 1992.0

Printer output

Centronics/parallel printer port

Environmental conditions

Temperature range
Storage -40°C to 70°C
Operating 0°C to 40°C
Full Accuracy 15°C to 35°C

Altitude up to 2000m
Relative humidity: up to 80% non-condensing
Installation category: II (in accordance with IEC664)
Pollution degree: 2 (mainly nonconductive)
This equipment is intended for indoor use only in non-explosive,
non-corrosive atmosphere.

Safety

Complies with the requirements of EN61010-1

EMC

Complies with EN50081-1, EN50082-1 generic emissions and
immunity standards by meeting with the requirements of
EN55022, IEC801.2, IEC801.3 and IEC801.4

Mechanical (approx. overall)

Height 150 mm (6″)
Width 440 mm (17 3/8″)
Depth 520 mm (20 1/2″)
Weight 11 kg (24 lb 4 oz)

Order codes and options

Description Order code

3255BL Inductance Analyzer – 200 kHz 1J3255BL
Supplied with user manual and power cable

3255B Inductance Analyzer – 500 kHz 1J3255B
Supplied with user manual and power cable

3255BQ Inductance Analyzer - 1 MHz 1J3255BQ
Supplied with user manual and power cable

Options

/A 1 mA to 1 A internal DC bias
/B GPIB (IEEE-488) interface

/D1 Bin handler (cannot be fitted with /D2)
/D2 Bin handler opto-coupled (cannot be fitted with /D1

Auxiliary unit

5A DC bias unit 3265B/5A 1J3265B/5A

10A DC bias unit 3265B/10A ` 1J3265B/10A

20A DC bias unit 3265B/20A 1J3265B/20A
(Not compatible with 3255BL)

25A DC bias unit 3265B/25A 1J3265B/25A
(Not compatible with 3255BL)

All auxiliary units are supplied with user manual, power cable,
spare fuses, 4 x BNC to BNC links and daisy chain
link.

Accessories

Description Order code

1009 DC Bias Fixture 1J1009
High current lead set for 1009 5-328-2005
Kelvin clips (fine jaws). 1EVA40100
Kelvin clips (large jaws) 1EVA40180
4-terminal lead set 1EV1505
SMD Tweezers 1EVA40120
Bus bars 4-324-6009
Rack mounting kit, 3U x full width 1EXA20230

(Unit needs rear support)

Wayne Kerr’s policy is one of continuous development and consequently the product may vary in detail from the description and specification in this publication.

Wayne Kerr Electronics

Vinnetrow Business Park

Vinnetrow Road, Runcton

Chichester, West Sussex

PO20 1QH, UK

Tel: [phone]

Fax: [phone]

www.waynekerrtest.com [e-mail] February 2006 A4

Wayne Kerr Electronics

165L New Boston Street

Woburn
MA 01801-6201 USA
Tel: [phone]

Sales: [phone]