Tegam 3525 Instruction Manual

MODEL 3525

GENERAL-PURPOSE, PROGRAMMABLE
LCR METER

Instruction Manual

PN# 3525-900-01CD

Publication Date: February 2009

REV. E

Table of Contents

TEGAM INC.

MODEL 3525

GENERAL-PURPOSE, PROGRAMMABLE

LCR METER

MODEL 3525

Instruction Manual

PN# 3525-900-01CD

Publication Date: February 2009

REV. E

NOTE: This user’s manual was as current as possible when this product was manufactured. However, products are
constantly being updated and improved. Because of this, some differences may occur between the description in this
manual and the product received.

Model 3525 LCR Meter Instruction Manual

a

Table of Contents

I INSTRUMENT DESCRIPTION............................................................................1-1

Instrument Description ........................................................................... 1-2

Feature Overview................................................................................... 1-2

Accessories Sheet .................................................................................. 1-4

Performance Specifications...................................................................... 1-5

Measurement Ranges......................................................................... 1-5

Table 1.1 - Absolute Impedance Range Limits Chart...............................1-5

Display A & B – Basic Accuracies ......................................................... 1-6

Table 1.2 – Basic Accuracy for Display A............................................... 1-6

Table 1.3 – Basic Accuracy for Display B............................................... 1-6

Calculating Actual Measurement Accuracies........................................... 1-7

Table 1.4 – Speed Coefficient.............................................................. 1-7

Table 1.5 – Amplitude Coefficient ........................................................ 1-7

Instrument Specifications........................................................................ 1-8

II PREPARATION FOR USE ..................................................................................2-1

Unpacking & Inspection........................................................................... 2-2

Safety Information & Precautions .............................................................2-2

Terms in this Manual ......................................................................... 2-2

Terms as Marked on Equipment........................................................... 2-2

Symbols........................................................................................... 2-3

Grounding the Equipment...................................................................2-3

Danger Arising from the Loss of Ground ............................................... 2-3

Use the Proper Fuse........................................................................... 2-4

Do not Use in Explosive Environments..................................................2-4

Do not Operate without Covers ........................................................... 2-4

Servicing Safety Summary ...................................................................... 2-4

Do not Service Alone ......................................................................... 2-4

Use Care when Servicing with Power On............................................... 2-4

Power Source ................................................................................... 2-4

Line Voltage Selection.............................................................................2-5

Table 2.1 – Operating Voltage Ranges.................................................. 2-5

III QUICK START INSTRUCTIONS.........................................................................3-1

Power the Unit.......................................................................................3-2

Factory Default Settings..........................................................................3-2

Table 3.1 - Factory Default Settings..................................................... 3-2

Instrument Setup...................................................................................3-3

Display A ......................................................................................... 3-3

Display B ......................................................................................... 3-3

Measurement Speed .......................................................................... 3-3

Test Frequency ................................................................................. 3-3

Test Voltage Level............................................................................. 3-3

Circuit Mode ..................................................................................... 3-3

Range.............................................................................................. 3-3

Trigger ............................................................................................ 3-3

Performing an Open and Short Circuit Null................................................. 3-4

Measurement Tips.................................................................................. 3-4

Model 3525 LCR Meter Instruction Manual

b

Table of Contents

IV OPERATING INSTRUCTIONS............................................................................4-1

Basic Operation...................................................................................... 4-2

Default Parameters................................................................................. 4-2

Front Panel Description ........................................................................... 4-3

Figure 4.1a – Front Panel Layout ......................................................... 4-3

Figure 4.1b – Measurement & Parameter Control Area............................ 4-4

Figure 4.1c – Comparator Controls Area ............................................... 4-5

Rear Panel Description............................................................................ 4-6

Figure 4.2 – Rear Panel...................................................................... 4-6

Selecting the Measurement Parameters..................................................... 4-7

Table 4.1a – Display A Description of Measurement Functions.................. 4-7

Table 4.1b – Display B Description of Measurement Functions..................4-7

Setting the Measurement Speed...............................................................4-8

Table 4.2 – 3525 Typical Measurement Times........................................4-8

Setting the Measurement Frequency ......................................................... 4-9

Setting the Measurement Signal Level.......................................................4-9

Setting the Equivalent Circuits Mode......................................................... 4-10

Setting the measurement Range .............................................................. 4-11

Table 4.3 – Measurement Range Characteristics .................................... 4-11

Setting the Trigger Mode.........................................................................4-13

Using the Comparator Functions...............................................................4-14

Overview ......................................................................................... 4-14

Table 4.4 – Operation of GO/NO-GO Comparator ................................... 4-14

Setting the High and Low Limit Values.................................................. 4-15

Preset Panel Function..............................................................................4-18

Overview ......................................................................................... 4-18

Setting Panel Numbers....................................................................... 4-18

Recalling Panel Numbers .................................................................... 4-18

Zero Correction...................................................................................... 4-19

Overview ......................................................................................... 4-19

Figure 4.3 – Terminal Connections for Zero Correction............................ 4-19

Open Circuit Correction......................................................................4-20

Short Circuit Correction......................................................................4-20

Audible Beeper ...................................................................................... 4-21

Overview ......................................................................................... 4-21

Setting the Beep Sound...................................................................... 4-21

Connection Methods ............................................................................... 4-22

Figure 4.4 – 3 Terminal Connection...................................................... 4-22

Figure 4.5 – 5 Terminal Connection...................................................... 4-23

V PROGRAMMING & INTERFACING.....................................................................5-1

Interfacing to the 3525 ........................................................................... 5-2

Front Panel Connections..........................................................................5-2

Figure 5.1 – Front Panel Measurement Connections................................ 5-2

Rear Panel ............................................................................................ 5-3

Figure 5.2 – Rear Panel Interfaces....................................................... 5-3

Model 3525 LCR Meter Instruction Manual

c

Table of Contents

V PROGRAMMING & INTERFACING cont’d

I/O Control Connector.............................................................................5-4

Compatible Connectors ...................................................................... 5-4

I/O Pin Outputs.................................................................................5-4

Figure 5.3 – I/O Control Connector Pin Orientation................................. 5-4

Table 5.1 – Pin Designations............................................................... 5-5

I/O Pin Descriptions...........................................................................5-5

Table 5.2 – BCD Panel Settings ........................................................... 5-6

Table 5.3 – Total Go & No Go Functional Relationships............................ 5-7

I/O Control Connector Electrical Schematic ........................................... 5-8

Figure 5.4 – I/O Control Connector Schematic....................................... 5-8

I/O Timing Diagrams .............................................................................. 5-9

Figure 5.5 – I/O Control Connector Timing Diagram ............................... 5-9

Approximate Measurement Times............................................................. 5-9

Table 5.4 – Approximate Measurement and Signal Processing Times......... 5-9

Analog Signal Measurement Time ........................................................ 5-10

Table 5.5a – Analog Signal Measurement Time...................................... 5-10

Measurement Speed .......................................................................... 5-10

Table 5.5b – Total Measurement Speed ................................................ 5-10

RS232C Communications ........................................................................ 5-11

Figure 5.6 – RS-232C Connector ......................................................... 5-11

Table 5.6 – RS-232C DTE Pin Configurations......................................... 5-11

RS-232C Settings.............................................................................. 5-12

Remote Commands ................................................................................ 5-13

Program Messages ............................................................................ 5-13

The Header ...................................................................................... 5-13

The Parameter.................................................................................. 5-13

Rules for Remote Commands .............................................................. 5-14

Rules for Commands and Parameters................................................... 5-14

Condition & State Registers ................................................................ 5-15

Commands List.................................................................................5-18

Table 5.7 – RS-232C & GPIB Command Set .......................................... 5-18

Command Reference.......................................................................... 5-19

VI SERVICE INFORMATION..................................................................................6-1

Warranty .............................................................................................. 6-2

Warranty Limitations .............................................................................. 6-2

Statement of Calibration ......................................................................... 6-2

Contact Information ............................................................................... 6-2

Repair Parts .......................................................................................... 6-3

Changing the Power Fuse ........................................................................ 6-3

Preparation for Calibration or Repair Service .............................................. 6-4

Expedite Repair & Calibration Form...................................................... 6-5

Model 3525 Verification Procedure............................................................6-6

VI APPENDIX .......................................................................................................A-1

Model 3525 LCR Meter Instruction Manual

d

Instrument Description

INSTRUMENT DESCRIPTION

Model 3525 LCR Meter Instruction Manual

PREPARATION FOR USE

QUICK START INSTRUCTIONS

OPERATING INSTRUCTIONS

PROGRAMMING & INTERFACING

SERVICE INFORMATION

APPENDIX

1-1

Model 3525 LCR Meter Instruction Manual Instrument Description

Instrument Description

Model 3525,TEGAM’s innovative solution for cost sensitive LCR applications, does not compromise
quality or performance. Its flexible design allows a diverse range of testing applications including
manual or automated testing of capacitors, inductors, coils, resistors, thermoelectric cooling
devices, materials, piezo-electric or other sensors or components possessing AC impedance
characteristics.

Up to 9 impedance parameters are easily viewed on each of the 3525’s two 4 ½ digit, LED
displays. Display A provides accurate and repeatable readings of Inductance (L), Capacitance (C),
Resistance (R), and Impedance (|Z|). Display B measures values for Dissipation Factor (D or Tan
δ), Quality Factor (Q), Phase Angle (θ), Measurement Voltage (V) and Measurement Current (I).
All parameters are easily monitored, selectable from the front panel, and may be measured as
Series or Parallel equivalent circuits.

The 3525’s compact size is unprecedented and allows side-by-side mounting in standard 19”
racks. A built-in comparator function makes the 3525 the ideal choice for manual component
checking. Whether you are verifying component values for QA or manufacturing, the built in GO­NO GO comparator reduces test time and increases productivity with an audible beeper that may
be set to alarm when a pass or fail state has been measured. A front panel lock feature prevents
accidental changes on instruments settings.

Model 3525 is shipped from the factory with standard Kelvin Klips, RS-232C port, and I/O
connector. There are a variety of optional accessories available, including GPIB Interface, BCD
Output, Kelvin Klip Leads, Kelvin Tweezers, Radial Sorting Fixture, and SMT Chip Test Fixture. See
the Accessories Sheet on page 1-4 for complete descriptions.

Feature Overview

The Model 3525 was designed with the right balance of features to keep cost down while
providing optimal performance for most basic LCR applications. Below is a summary of the
instrument’s main features.

0.08% Basic Accuracy with 4.5 digit resolution.

The 3525 is designed to perform basic impedance measurements with up to 0.08% basic
accuracy. Measurement accuracies are dependent upon a number of parameters and test
conditions. See Performance Specifications to determine the actual measurement
accuracies.

High Speed Measurement

With a 1kHz test frequency a reading can be obtained in as little as 15 mS when the
instrument is operating in fast mode.

Manual or Remote Operation
The 3525 is equipped for manual or remote operation. Standard interfaces include a RS­232C and I/O port. GPIB and BCD interfaces are available as optional accessories.

1-2

Model 3525 LCR Meter Instruction Manual Instrument Description

Feature Overview cont’d:

Dual High Intensity Displays

The 3525 is equipped with dual LED displays for easy viewing. Display A measures 4½
digits of Inductance (L), Capacitance (C), Resistance (R), or Impedance (|Z|) while Display

B indicates Dissipation Factor (D or Tan δ), Quality Factor (Q), Phase Angle (θ),
Measurement Voltage (V), or Measurement Current (I).

Programmable GO/NO-GO Comparator with Audible Buzzer

Each unit has an internal comparator function that can be set by the user. Comparator
Outputs result from the values of Display A, Display B, or a combination of the two. The
comparator outputs may be read from the front panel, buzzer, the I/O connector located
on the rear panel, or queried from the remote interfaces.

99 Preset Storage Locations

Panel Settings 01-99 are user-definable and may be programmed manually or via
communication interfaces. These settings are stored in non-volatile RAM locations and may
be recalled from the front panel or any of the rear interfaces.

Less than ½ Rack Width

Two 3525 units are able to be rack mounted, side-by-side, in a standard 19” rack using a
third party rack mount kit, without modifying the instrument cases.

Manual or Auto Ranging

In AUTO range, the instrument automatically selects from 10 different impedance ranges.
The selected range is dependent upon the DUT’s absolute impedance, |Z|. In the manual
range mode, the user may select from any of these ten ranges through the front panel.

Voltage and Current Monitors

Test Voltage (Vx) and Current (Ix) can be measured at the DUT terminals and are
viewable on Display B to three significant digits.

Open and Short Circuit Zero Correction

Parasitic impedance of the test cables and/or test fixture may be cancelled out by
performing the 3525’s auto zero functions.

Front Panel Lock
The 3525 is equipped with a front panel lock-out feature to prevent accidental changes to
instrument settings.

Dual Trigger Modes
Trigger instructions may be executed either internally or externally. Internal triggering
allows the instrument to run continuously while external triggering requires instruction
from the front panel, I/O connector, RS-232C, or GPIB interfaces.

Series or Parallel Equivalent Measurements
AC parameters may be measured as Series or Parallel equivalents.

1-3

Model 3525 LCR Meter Instruction Manual Instrument Description

3525 Accessories Sheet

2005B - Chip Tweezers (5ft)

This four-terminal tweezer set
makes solid connections to chip
components in manual sorting
applications. Capacity of jaws is

12.7mm (0.5 in.). The 2005B Chip
Component Tweezer Set includes a

1.5m (5 ft) cable for connection to
the 3525. Contact tips are
replaceable. P/N 47422.

47422 Chip Tweezer
Replacement Kit

Tweezer tips are intended to last
100,000 to 500,000 operations. An
optional tip replacement kit includes
12 replacement tips, 2 screws and 1
wrench.

3511 - Chip Test Fixture

Available for performing three
terminal measurements on surface
mount devices. Connects directly to
the front panel of the 3525. Use the
3511 for medium and high
impedance measurements.

3525-900-01CD – Instruction
Manual

Printed copy of the 3525 users
manual.

1-4

3510-Radial Lead Adapter

This sorting fixture allows for efficient
four-wire measurement of leaded parts.
The test fixture features spring action
contacts for easy insertion and removal of
test components.

47454 – Kelvin Klips

Kelvin Klips allow solid four-terminal,
Kelvin connections to leaded components.
The jaws are assembled with hardened
gold-plated, beryllium copper, which
ensures low contact resistance, low
thermal emf to copper, high corrosion
resistance, and long service life. An
alligator clip is provided allowing
connection of a passive guard. The
assembly includes a 5 ft (1.5m) cable for
connection to the 3525.

NOTE: Under certain measurement conditions,
Kelvin Klips can cause a loss of measurement
accuracy. Fixtures 3510, 3511, or 2005B chip
tweezers are recommended for the following
component values:

C<100pF; L < 100μH; R > 1MΩ

CBL-3102-BNC-BNC Cable

BNC to BNC, RG 58/U, coaxial cable for
use at the trigger inputs and outputs of
the 3525. Cable length is a minimum of 1
meter (3.28 ft) long.

KK100- Kelvin Klip™ Rebuild
Kit

Kelvin Klip™ replacements for
construction or repair of Kelvin Klip
leads.

GPIB (IEEE-488) Cables

1583-3 – 1-meter GPIB buss cable
1583-6 – 2-meter GPIB buss cable
1583-9 – 3-meter GPIB buss cable

3502 – BCD Interface

BCD output for interface to handlers
and other automated systems.

3501 – GPIB Interface

GPIB (IEEE-488)-compatible interface
card. Field or factory installation.

740565 – CABLE NULL

740565-6 – 6’ cable, null mod, 9-9
740565-10 – 10’ cable, null mod, 9-9

Model 3525 LCR Meter Instruction Manual Instrument Description

Performance Specifications

The advertised specifications of the Model 3525 are valid under the following conditions:

1. The instrument’s calibration must be verified using the methods and intervals as described

in the Service Information Section of this user’s manual.

2. The instrument must be in an environment which does not exceed the limitations as

defined under “Environmental” in the Instrument Specifications section.

3. The unit is allowed to warm up for a period of at least 30 minutes before measurements

are taken. A warm-up period of 60 minutes is recommended after exposure to or storage
in a high humidity, non-condensing environment.

4. Use only TEGAM-manufactured test leads and sorting fixtures with this device. Modification

of existing test cables or fixtures may compromise the accuracy of your readings. Always
perform an open and short zero null procedure before taking measurements.

Measurement Ranges

Table 1.1: Absolute Impedance Range Limits Chart

Range No. |Z| Measurement Range

1 0.0100Ω ~ 0.1999Ω

2 0.1800Ω ~1.9999Ω

3 1.800Ω ~ 19.999Ω

4 20.00Ω ~ 199.99Ω

5 0.2000kΩ ~ 1.9999kΩ

6 2.000kΩ ~ 19.999kΩ

7 20.00kΩ ~ 199.99kΩ

8 0.1800MΩ ~ 1.9999MΩ

9 2.000MΩ ~ 19.999MΩ

10 18.0MΩ ~ 199.99MΩ

The measurement range is determined by the absolute impedance, |Z| of the DUT. The absolute
impedance includes the vector sum of L, C, and R values.

1-5

Model 3525 LCR Meter Instruction Manual Instrument Description

Display A & B - Basic Accuracies

Table 1.2: Basic Accuracy for Display A

Range L C R Z

1 ±(0.90+30/fL1)% ±(0.60+1.5fC1)% ±(1.00+0.21/R1)% ±(1.00+0.15/Z1)%

2 ±2.10% ±2.10% ±2.10% ±1.80%

3 ±0.39% ±0.39% ±0.39% ±0.35%

4 ±0.10% ±0.10% ±0.10% ±0.08%

5 ±0.09% ±0.09% ±0.09% ±0.08%

6 ±0.13% ±0.13% ±0.13% ±0.11%

7 ±0.16% ±0.16% ±0.16% ±0.14%

8 ±0.34% ±0.34% ±0.34% ±0.30%

9 ±(0.17+1.17fL2)% ±(0.17+30/fC2)% ±(0.15+0.20R2)% ±(0.15+0.16Z2)%

10 ±(2.00+1.00fL2)% ±(1.7+30/fC2)% ±(2.00+0.16R2)% ±(2.00+0.11Z2)%

Table 1.3: Basic Accuracy for Display B

Range D θ

1 ±(0.002+0.0015/Z1) ±(0.10+0.09/Z1)°

2 ±0.0179 ±1.00°

3 ±0.0034 ±0.18°

4 ±0.0016 ±0.08°

5 ±0.0011 ±0.05°

6 ±0.0016 ±0.08°

7 ±0.0020 ±0.10°

8 ±0.0036 ±0.19°

9 ±(0.002+0.0015Z2) ±(0.10+0.09Z2)°

10 ±(0.012+0.0014Z2) ±(0.70+0.08Z2)°

IMPORTANT ACCURACY NOTES:

Basic Precision Test Conditions:

• Measurement Speed: SLOW

• Measurement Signal Level: 1V

• Open and Closed Circuit Zero Correction

Performed

Units:

• Z

- DUT absolute impedance [Ω]

1

• Z

- DUT absolute impedance [MΩ]

2

• C

- Capacitance [mF]

1

• C

- Capacitance [pF]

2

• L

- Inductance [μH]

1

• L

- Inductance [kH]

2

• f - Test Frequency [kHz]

Other Conditions

• Q – Quality factor based on 1/D

• C - Accuracy is for when D≤0.1

• L - Accuracy is for when D≤0.1

• R - Accuracy is for when θ≤6°

The basic accuracy formulas in Tables 1.2 & 1.3 are based on the assumption that the
measurement speed is Slow, and the measurement signal level is 1V. The exact accuracies will
vary according to the measurement speed and measurement signal level. The formula for
calculating the exact measurement accuracy is found in the next section:

1-6

Model 3525 LCR Meter Instruction Manual Instrument Description

Calculating Actual Measurement Accuracies

NOTE: All measurement accuracies assume that open and short circuit zero corrections have

been performed.

Measurement Accuracy = Basic Accuracy X Speed Coefficient X Level Coefficient + 2 Counts

Table 1.4: Speed Coefficient

FAST NORM SLOW

Speed Coefficient

Table 1.5: Amplitude Coefficient

1V 500mV 50mV
Amplitude Coefficient 1 1.5 2

NOTE: The 3525 will produce a reading in both range 1 and range 10 using a 50mV test voltage. These
readings are for reference use only and are not within any specified accuracy limits.

When measuring C and L, if the condition D≤0.1 is not satisfied, use Z and θ for accuracy
calculations.

See below for an example calculation of this condition:

< Using Z and θ for accuracy calculation >
When C=20nF, D=0.5, Measurement Frequency = 1kHz, Signal Level = 1V, and Measurement
Speed is SLOW:

1. Solve for Z and θ (The |Z| or θ measured values of the 3525 can also be used.)

θ=tan-1 (1/D)=63.43°
Z=(1/ωC)×(1/sinθ)=8.897kΩ

2. Find the accuracy value using the charts for Z and θ

From Z, the measurement range will be range 6. In range 6, the accuracy of
Z =±0.11%, and the accuracy of θ =±0.08°.
From this accuracy, the maximum and minimum values of Z and θ should be
calculated.

: 8.907kΩ Z

Z

max

: 63.51° θ

θ

max

min

min

3. From the max and min values, find the range of C and D.

= 1/(Z

C

max

C

= 1/(Z

min

D

= 1/tan θ

max

= 1/tan θ

D

min

×ω×sinθ

min

×ω×sinθ

max

= 0.5017 (0.0017)

min

= 0.4983 (-0.0017)

max

4. The Accuracy of C =±0.18%, D=±0.0017

3 1.5 1

: 8.887kΩ
: 63.35°

) = 2.0036nF (+0.18%)

min

) = 1.9964nF (-0.18%)

max

1-7

Model 3525 LCR Meter Instruction Manual Instrument Description

Instrument Specifications

Measurement Parameters

• L (Inductance)

• C (Capacitance)

• R (Resistance)

• |Z| (Impedance)

• D (Dissipation Factor / Tan δ)

• Q (Quality Factor)

• θ (Phase Angle in Degrees)

• V (Inter-Terminal Voltage)

• I (Inter-Terminal Current)

Measurement Range

• L 1.6000uH ~ 199.99kH

• C 0.9400pF ~ 199.99mF

• R 0.0100 ~ 199.99MΩ

• |Z| 0.0100 ~ 199.99MΩ

• D 0.0001 ~ 19.999

• Q 0.5 ~ 199.99

• θ –180.00 ~ 180.00°

• V 0.00V ~ 1.00V

• I 0.00mA ~ 10.00mA

Basic Precision

• 0.08% (See Measurement Range and Precision for Exact Accuracies)

Measurement Frequency

• 1kHz, 120Hz (Frequency Precision: ±0.01% or less)

Output Impedance

• 100Ω ±10Ω

Measurement Signal Level

• 50mV, 500mV, 1V (Setting Accuracy: ±10%±10mV)

Maximum Short-Circuit Current

• 10mA

Measurement Ranges

• The measurement range is based on the value of |Z|. Parameters other than |Z|, such as L, C, R, D, Q, & θ are

calculable values.

• There are ten ranges from 0.1Ω ~ 100MΩ

• Auto or Manual Range Modes

Equivalent Circuit Modes

• Auto or Manually selected Parallel or Series Equivalent Circuit Measurement Modes

1-8

Model 3525 LCR Meter Instruction Manual Instrument Description

Instrument Specifications cont’d:

Displays A & B

• 4½ Digit, High Visibility LED Displays

Measurement & Measurement Speed

• Measured parameter values are determined by the voltage and current amplitudes & phases detected by the

instrument’s circuitry and/or the average of calculated values.

• Total measurement times are dependent on the measurement frequency, integration speed, comparator settings

and correction factor values.

• There are three user-selectable integration speeds to choose from. These are Fast, Normal, and Slow.

Typical Measurement Times:

MODE

MEASUREMENT

FREQUENCY

FAST

NORMAL

SLOW

Trigger Functions

• Internal Trigger – Instrument runs in continuous mode.

• External Trigger – Executed by the front panel push button, I/O connector TTL input, RS-232C, or GPIB

commands

Measurement Terminal

• 5-Terminal (BNC with Guard) Kelvin Configuration

Auto Zero Correction

• Open Circuit Correction ≥1kΩ

• Short Circuit Correction ≤ 1kΩ

Absolute Comparator

Functions

• Display A

• Display B

• Display A & Display B

Output

s

• Front Panel LED

• Audible Buzzer

• External I/O Connector (HI,LO,GO,TOTAL GO,BUSY,END)

• RS-232C or GPIB Interface

Front Panel Settings

• Up to 99 user-definable front panel settings

• System Reset – Initializes the instrument to factory default settings

120 Hz 1kHz

40mS
90mS

360mS

15mS
50mS

250mS

1-9

Model 3525 LCR Meter Instruction Manual Instrument Description

Instrument Specifications cont’d:

Key Lock Function

• Disables all front panel keys except the manual trigger key.

Audible Buzzer

• User selectable to GO, NO-GO, or OFF operation

Remote Interface

• Control I/O Connector (TTL Open Collector; Optically Isolated) – Standard Accessory

• RS-232C Interface – Standard Accessory

• GPIB Interface – Optional Accessory

• BCD Interface – Optional Accessory

Environmental

• Operating Conditions: from 32° to 104°F (0° to 40°C), <80% RH; (Non-Condensing)

NOTE: Accuracy errors will double when the unit is operated outside of the specified environmental conditions.

• Storage Conditions: from 14° to 131°F (–10° to 55°C), <80% RH; (Non-Condensing)

AC Power Requirements:

• 100/120/220/240 VAC ± 10%; 50/60 Hz

• 20VA ±10%

Fuse:

• For 100/120 VAC Operation; Use 1A @ 250V, fast acting, TEGAM PN#FU-3102-220

• For 220/240 VAC Operation; Use ½A @ 250V, fast acting, TEGAM PN#49743

3525 Dimensions:

• Depth: 6.69” (17.0 cm)

• Width: 7.87” (20.0 cm)

• Height: 3.94” (10.0 cm)

Weight:

• 5.51 lb (2.5kg)

Standard Accessories:

• Users Manual CD Version – PN# 3525-900-01CD

• Standard AC Power Cord – PN#161006600

• Kelvin Klips - PN#47454

Optional Accessories:

• Radial Lead Adapter – PN#3510

• Chip Tweezers – PN#2005B

• Chip Test Fixture – PN#3511

• BCD Interface – PN#3502

• GPIB (IEEE-488 Interface) – PN#3501

1-10

Preparation for Use

INSTRUMENT DESCRIPTION

PREPARATION FOR USE

QUICK START INSTRUCTIONS

OPERATING INSTRUCTIONS

PROGRAMMING & INTERFACING

SERVICE INFORMATION

APPENDIX

Model 3525 LCR Meter Instruction Manual 2-1

Model 3525 LCR Meter Instruction Manual Preparation for Use

Unpacking & Inspection:

Each 3525 is put through a series of electrical and mechanical inspections before shipment to the
customer. Upon receipt of your instrument, unpack all of the items from the shipping carton and
inspect, them for any damage that may have occurred during transit. Report any damaged items
to the shipping agent. Retain and use the original packing materia l f o r reshipment if necessary.

Upon receipt, inspect the carton for the following items:
Model 3525 General Purpose, Programmable LCR Meter

Model 3525 User’s Manual CD
Kelvin Klips™ PN#47454

!

Safety Information & Precautions:

The following safety information applies to both operation and service personnel. Safety
precautions and warnings may be found throughout this instruction manual and on the equipment.
These warnings may be in the form of a symbol or a written statement. Below is a summary of
these precautions.

Terms in This Manual:

CAUTION statements identify conditions or practices that could result in damage to the equipment
or other property.

WARNING
life.

statements apply conditions or practices that could result in personal injury or loss of

Terms as Marked on Equipment:

CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking,
or a hazard to property including the equipment itself.

DANGER

indicates a personal injury hazard immediately accessible as one reads the marking.

2-2

Model 3525 LCR Meter Instruction Manual Preparation for Use

!

Safety Information & Precautions Cont’d:

Symbols:

As Marked in This Manual:

!

This symbol denotes where precautionary information may be found.

As Marked on Equipment:

!

CAUTION – Risk of Danger

DANGER – Risk of Electric Shock

Earth Ground Terminal

l

O

On

Off

Frame or Chassis Terminal

Earth Ground Terminal

Alternating Current

Grounding the Equipment

This product is grounded through the grounding conductor of the power cord.
WARNING:
properly wired receptacle before using this instrument. The proper grounding of this instrument is
essential for safety and optimizing instrument operation.

Danger Arising from Loss of Ground

WARNING:
in the instrument. Under these conditions all accessible parts, including insulating parts such as
keypads and buttons, could develop a hazardous voltage and put the user at risk.

To avoid electrical shock or other potential safety hazards, plug the power cord into a

If the connection to ground is lost or compromised, a floating potential could develop

2-3

Model 3525 LCR Meter Instruction Manual Preparation for Use

!

Use the Proper Fuse

To avoid fire hazard, use only the correct fuse type as specified for the AC power supply in the
“Instrument Description” or “Service Information” sections of this manual. Please note that the
fuse rating for 100/120-volt operation is different than the rating for 200/240-volt operation.
Information about the proper fuse type is also printed on the rear panel of the instrument.

Refer fuse replacement to qualified service personnel.

Do Not Use in Explosive Environments

WARNING:

Do not Operate Without Covers

WARNING:
missing panels or covers could result in personal injury.

The 3525 is not designed for operation in explosive environments.

This device should be operated with all panels and covers in place. Operation with

FOR QUALIFIED SERVICE PERSONNEL ONLY

Servicing Safety Summary:

!

Do Not Service Alone

Do not perform service or adjustment on this product unless another person capable of rendering
first aid is present.

Use Care When Servicing with Power On or Off

Dangerous voltages may exist at several points in this product. To avoid personal injury or
damage to this equipment, avoid touching exposed connections or components while the power is
on. Assure that the power is off by unplugging the instrument when removing panels, soldering, or
replacing components.
WARNING:
present throughout the instrument even when the instrument is in the OFF state.
Always unplug the instrument and wait 5 minutes before accessing internal components.

Power Source

This product is intended to connect to a power source that will not apply more than 250V RMS
between the supply conductors or between either supply conductor and ground. A protective
ground connection by way of the grounding conductor in the power cord is essential for safe
operation.

The instrument power source is electronically con trolled, meaning that there is power

2-4

Model 3525 LCR Meter Instruction Manual Preparation for Use

Line Voltage Selection:

!

CAUTION: DO NOT APPLY POWER TO THE INSTRUMENT BEFORE READING THIS SECTION:
Unless otherwise specified, the Model 3525 is delivered from TEGAM with its power supply set for

120V, 60 Hz operation. However, the 3525 design allows it to operate under 100/120/220/240V
@ 50/60 operation. It is strongly recommended that the line voltage, frequency setting, and fuse
type be verified before powering the unit.

First, determine the operating voltage that the instrument will be supplied. Also, verify that the
supply voltage does not fall outside of the allowable ranges in the table below:

Table 2.1 – Operating Voltage Ranges

Switch Position Voltage Range

100 90V ~ 110V
120 108V ~ 132V
220 198V ~ 242V
240 216V ~ 250V

The following procedure describes the steps necessary to change the 3525 power settings from
factory default settings to a new setting.

1. Verify that there is no power connected to the unit.

2. Change the line selector switch located on the rear panel of the 3525 to the desired
operating voltage by using a small screwdriver to turn the voltage selection switch to the
desired position.

Refer to the figure below:

With your screwdriver, turn the
desired voltage number to the black
arrow. For example, the setting
here is for 240V.

3. The fuse size may need to be changed as a result of the increased or decreased voltage
operation. Please refer to the “Service Information” section of this manual (page 6-3) for
detailed fuse information. The rear panel of the 3525 will also contain information
regarding fuse sizes and types.

2-5

Quick Start Instructions

INSTRUMENT DESCRIPTION

PREPARATION FOR USE

QUICK START INSTRUCTIONS

OPERATING INSTRUCTIONS

PROGRAMMING & INTERFACING

SERVICE INFORMATION

APPENDIX

Model 3525 LCR Meter Instruction Manual 3-1

Model 3525 LCR Meter Instruction Manual Quick Start Instructions

Proper use of the Model 3525 will maximize measurement accuracy and productivity. The Quick
Start section is designed to provide speedy setup for general-purpose applications. It is highly
recommended that the user read Chapter 4 for applications involving high accuracy or requiring
optimal performance of the instrument.

Power the Unit

!

CAUTION

The power supply of the Model 3525 is designed for 50-60 Hz operation and a voltage range of
100-240 VAC. Review the line voltage selection procedure on page 2-5 before proceeding. Make
sure that the line voltage setting matches the supply voltage and frequency.

Power the unit and allow at least 30 minutes for the unit to warm up. Make sure that the safety
precautions on pages 2-3 and 2-4 have been reviewed and understood. Verify that the
environmental conditions, listed on pages 1-10, are met.

Factory Default Settings

The 3525 is shipped from the factory with instrument settings as follows:

Table 3.1 – Factory Default Settings

Parameter Setting Parameter Setting
1 Range AUTO 8 Communication *RS232 or GPIB
2 Trigger Internal 9 Key Lock UN-LOCKED
3 Speed FAST 10
4 Display A Capacitance 11
5 Display B Dissipation Factor 12
6 Trigger Internal 13
7 Range Auto 14

* When a device clear command is sent via communications interface, this value does not change.

These settings can be recalled by sending a device clear command, *RST via RS232, or GPIB
interface.

NOTE: When the 3525’s power is cycled, the instrument’s settings will return to the state that
existed at the time the power was last turned off. You can initialize the 3525 to factory default
settings by pressing the [MANU] key while powering the unit.

Comparator/Buzzer OFF

Frequency 1kHz

Voltage Level 1V

Circuit Mode AUTO

Manual/Remote Remote

3-2

Model 3525 LCR Meter Instruction Manual

Quick Start Instructions

Instrument Setup

Setup of the Model 3525 for general-purpose use is easy. Once the unit has been allowed to warm
up, review the front panel and note the changes that need to be made in order to perform your
required measurements. Below are Quick Setup instructions to adjust the main measurement
parameters of the 3525. Refer to Chapter IV, Operating Instructions, for a comprehensive
description of all the measurement options and instrument settings, including the ones listed
below:

Display A

To select L, C, R or |Z| value to be indicated on Display A, make sure that the comparator function

is disabled by pressing the [ON] key until all of the LED’s in the JUDGMENT field are off. In the
FUNCTION field, press the [A] key until the desired parameter’s annunciator is lit.

Display B

To select D, Q, θ, V or I value to be indicated on Display B, make sure that the comparator

function is disabled by pressing the [ON] key until all of the LED’s in the JUDGMENT field are off.
In the FUNCTION field, press the [B] key until the desired parameter’s annunciator is lit.

Measurement Speed

In order to select FAST, NORMAL, OR SLOW mode, press the [SPD] key until the desired
measurement rate is illuminated.

Test Frequency

In order to choose a 1kHz or 120 Hz test frequency, press the [FREQ] key until the desired
frequency LED is illuminated.

Test Voltage Level

Select either 1V, 500mV, or 50 mV test voltage by pressing the [LEV] key until the desired voltage
is selected.

Circuit Mode

The default equivalent circuit mode is AUTO. Refer to Chapter IV for information on series or
parallel equivalent circuit measurements.

Range

The default range setting is AUTO. Refer to Chapter IV for more information on manual range
selection.

Trigger

Press the [INT] key to select internal (continuous) triggering mode. Press the [MANU] key to
select manual or external triggering options. Trigger the unit from the front panel by pressing the
[MANU] key.

3-3

Model 3525 LCR Meter Instruction Manual Quick Start Instructions

Performing an Open and Short Circuit Null

Once you have verified that all of the instrument settings are correct, the next step is to perform a
zero correction.

1. Assuming that Kelvin Klip™ leads are being used, orient the leads in a similar position that

they will be connected to the DUT. Open the leads (refer to page 4-19 for proper lead
orientation.)

2. Press the [OPEN] key in the Zero field of the front panel. Allow the unit to step through the

open circuit null procedure.

3. Then short the Kelvin Klip™ leads together. Press the [SHORT] key and allow the

instrument to step through the short zero adjustment.

You have completed the Zero Correction procedure and are now ready to take basic impedance
measurements. Refer to Chapter IV, Operating instructions for additional details or information
regarding the use of this instrument.

Measurement Tips

Here are some general tips for users who are relatively new to performing LCR measurements:

• Unless otherwise specified, use 120Hz for capacitance measurements and use 1kHz for

testing inductors.

• The 3525 will take the most accurate reading at SLOW measurement speed and 1V test

voltage level.

• Orientation of test leads is important for repeatable measurements especially at high

frequencies. Try to keep lead orientation the same when making precision measurements.

• Keep metallic or other objects away from test leads including hands when performing zero

correction or impedance measurements.

• When measuring components with values that fall to the outer limits or outside of a

particular range, put the instrument in manual range to eliminate range switching by
locking into one range. This increases repeatability and measurement accuracy.

• When testing capacitors, make sure that the capacitor is completely discharged before

connection to the measurement terminals of the 3525.

• Use the Guard Terminal for high impedance measurements to minimize leakage errors and

noise.

3-4

Operating Instructions

INSTRUMENT DESCRIPTION

PREPARATION FOR USE

QUICK START INSTRUCTIONS

OPERATING INSTRUCTIONS

PROGRAMMING & INTERFACING

SERVICE INFORMATION

APPENDIX

Model 3525 LCR Meter Instruction Manual 4-1

Model 3525 LCR Meter Instruction Manual Operating Instructions

Please read and understand Chapter III, Quick Start Instructions before proceeding
with this section.

Basic Operation

The Model 3525 is a highly versatile product, designed for use in many different applications.
There are ideal configurations of the 3525 for each measurement application. These configurations
optimize accuracy, measurement speed, and flexibility.
This section is designed to give the user a comprehensive description of the parameters and
operating modes available from the Model 3525. The user will be exposed to additional topics that
will enhance the integration of the Model 3525 into their application.
It is highly recommended that the user read this section thoroughly if the intended application
requires high precision and maximum throughput.

Default Parameters

Model 3525 is shipped from TEGAM fully calibrated, tested, and preset to factory default settings
to accommodate general-purpose manual operation. Chapter III, Quick Start Instructions, contains
specific information about factory default settings and some general tips for new users. Please
read and understand Chapter III, Quick Start Instructions, before proceeding.

4-2

Model 3525 LCR Meter Instruction Manual Operating Instructions

Front Panel Description

Figure 4.1a: Front Panel Layout

DISPLAY A

COMPARATOR

STATUS

DISPLAY

COMPARATOR

OPERATIONS PANEL

MEASUREMENT TERMINALS

DISPLAY B

PARAMETER

SELECTION KEYS

PARAMETER MODE

INDICATORS

DISPLAY A

4-1/2 Digit LED Display indicates measured
values for L, C, R, and |Z|.

DISPLAY B

4-1/2 Digit LED Display indicates measured
values for D, Q, θ, V, and I.

Parameter Mode Indicators

Displays active parameter modes and settings.
Comparator Status Display
Displays judgment results for display A, Display
B or both. Results are based on comparator
settings and measurement results.

Parameter Selection & Control Keys

Use these keys for selecting measurement
modes and parameters.

Comparator Operations Panel

Used for enabling the comparator, programming
high and low limits and for preset panel selection.

Measurement Terminals:

A 5-terminal scheme is used:
HFORCE – High potential terminal for sourcing
measurement current.
HSENSE - The "high" terminal for voltage sensing.
LSENSE - The "low" terminal for voltage or sensing
LFORCE - Low potential terminal for sourcing
measurement current.
GUARD - The guard terminal. Use this connection
to cancel any stray capacitance and conductance
associated with high impedance measurements.

4-3

Model 3525 LCR Meter Instruction Manual Operating Instructions

R

R

Front Panel Description cont’d:

Figure 4.1b: Measurement & Parameter Control Area

MEASUREMENT
SPEED

DISPLAY A OR B

PARAMETER SELECTION

TEST FREQUENCY

COUNT SETTING

Measurement Speed Key

Use this key to select either FAST, NORMAL, or SLOW
measurement speed.

Test Frequency Key

Use this key to select either 120Hz or 1kHz
measurement frequency.

Measurement Signal Level Key

Press this key to select 1V, 500mV, or 50mV test
signal amplitude.

Equivalent Circuits Mode Key

Press this key to select Series, Parallel, or AUTO
equivalent circuit measurements.

Range Mode Key

Press the AUTO key to toggle between AUTO and
Manual ranging modes.

Internal Trigger Key

Press this key to select continuous internal triggering
of the instrument.

Manual Trigger Key

Press the manual trigger key to select manual or
external triggering from the front panel or remote
interface. Consequent pressing of the [MANU] key
will trigger the instrument.

MEASUREMENT SIGNAL
AMPLITUDE LEVEL

EQUIVALENT
MEASURMENT
CIRCUIT

AUTO OR MANUAL
RANGE

INTERNAL TRIGGER

CURSO

POSITIONING

ENTER KEY

ANGE UP/DOWN

MANU

EXTERNAL TRIGGER SELECTION

MANUAL TRIGGER AND

SELECTION

POWER ON/OFF

DISPLAY A Selection Key

Press [A] to select the active measurement
parameter for Display A.

DISPLAY B Selection Key

Press [B] to select the active measurement
parameter for Display B.

Count Setting Keys

Pressing the [▲] or [▼] keys allows the user to
change count, decimal place or units settings during
comparator setup.

Cursor Positioning Keys

The [►] or [◄] key allows movement of the display
cursor when programming comparator settings.

Enter Key

Enters new parameters or modes into instrument
memory.

Range Down key

In manual range mode, this key decrements the
active measurement range number.

Range Up Key

In manual range mode, this key increments the
active measurement range number.

Power Switch

Toggles the unit power either on or off.

4-4

Model 3525 LCR Meter Instruction Manual Operating Instructions

T

T

Front Panel Description cont’d:

Figure 4.1c: Comparator Controls Area

PANEL SELECTION

COMPARATOR LOW
LIMIT

COMPARATOR
HIGH LIMIT

Panel Selection

Use this key to recall panel presets from 00-99

Comparator Low Limit

Press this key to access the comparator low limit
programming mode.

Comparator High Limit

Press this key to access the comparator high limit
programming mode.

SHORT

Comparator ON/OFF

Pressing this key will either enable or disable
comparator operation.

Open Circuit Null

With the test leads open, pressing this key will
initiate the open circuit zeroing process.

Short Circuit Null

With the test leads shorted, pressing this key will
initiate the short circuit zeroing process.

COMPARATOR

ON/OFF

OPEN CIRCUI

NULL

SHORT CIRCUI

NULL

4-5