QuadTech 7600 B User manual

7600 Precision LCR Meter
Model B
Instruction Manual
Form 150261/A4
QuadTech, Inc., 1997
The material in this manual is for informational purposes only and is subject to change,
without notice. QuadTech assumes no responsibility for any error or for consequential
damages that may result from the misinterpretation of any procedures in this publication.
!Product will be marked with this symbol (ISO#3684) when it is necessary for the user to
refer to the instruction manual in order to prevent injury or equipment damage.
Product marked with this symbol (IEC417) indicates presence of direct current.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX [phone] - TestEquipmentDepot.com
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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iii
Contents
Warranty ...........................................................................................................vii
Specifications ...........................................................................................................ix
Introduction - Section 1
1.1 Unpacking and Inspection.............................................................................1-1
1.2 Product Overview..........................................................................................1-1
1.3 Controls and Indicators..................................................................................1-2
1.4 Accessories Included.....................................................................................1-5
1.5 Accessories/Options Available......................................................................1-5
1.6 Installation .....................................................................................................1-6
1.6.1 Instrument Positioning.......................................................................1-6
1.6.2 Power Requirements..........................................................................1-6
1.6.3 Safety Inspection ............................................................................... 1-7
Operation - Section 2
2.1 General...........................................................................................................2-1
2.2 Startup ...........................................................................................................2-1
2.3 Connection to Device Under Test .................................................................2-1
2.4 Zeroing...........................................................................................................2-2
2.5 Measurement Procedure ................................................................................2-3
2.5.1 General...............................................................................................2-3
2.5.2 Default Measurement Conditions......................................................2-3
2.6 Menu Functions.............................................................................................2-5
2.6.1 General...............................................................................................2-5
2.6.2 Setup Menu........................................................................................2-5
2.6.2.1 Primary Parameter................................................................2-6
2.6.2.2 Secondary Parameter............................................................2-9
2.6.2.3 Frequency .............................................................................2-10
2.6.2.4 AC Test Signal .....................................................................2-10
2.6.2.5 DC Bias Voltage...................................................................2-11
2.6.2.6 Range Hold...........................................................................2-14
2.6.2.7 Range Locked.......................................................................2-15
2.6.2.8 Measurement Accuracy........................................................2-20
2.6.2.9 Measurement Delay..............................................................2-20
2.6.2.10 # to Average .......................................................................2-21
2.6.2.11 Contact Check ....................................................................2-21

iv
Contents (continued)
2.6.3 I/O Menu............................................................................................2-22
2.6.3.1 Display Type ........................................................................2-23
2.6.3.2 Nominal Value......................................................................2-26
2.6.3.3 Result Format ....................................................................... 2-26
2.6.3.4 Trigger..................................................................................2-27
2.6.3.5 Handler Interface..................................................................2-27
2.6.3.6 RS-232 Interface...................................................................2-27
2.6.3.7 IEEE-488.2 Interface............................................................2-28
2.6.3.8 Print Results..........................................................................2-28
2.6.3.9 Results to Floppy..................................................................2-29
2.6.4 Analysis Menu...................................................................................2-35
2.6.4.1 Binning .................................................................................2-36
2.6.4.2 Test Sequencing....................................................................2-41
2.6.4.3 Parameter Sweep .................................................................. 2-44
2.6.4.4 Median..................................................................................2-46
2.6.4.5 Distortion Detection ............................................................. 2-46
2.6.4.6 Load Correction....................................................................2-46
2.6.5 Utilities Menu....................................................................................2-48
2.6.5.1 Save Setup ............................................................................ 2-49
2.6.5.2 Recall Setup.......................................................................... 2-50
2.6.5.3 Setup Accuracy.....................................................................2-51
2.6.5.4 Open / Short..........................................................................2-54
2.6.5.5 Lock Out...............................................................................2-55
2.6.5.6 Calibration............................................................................2-56
2.6.5.7 Set Time/Date.......................................................................2-56
2.6.5.8 Usage/Cal Date.....................................................................2-57
2.6.5.9 Set Contrast ..........................................................................2-57
2.6.5.10 Self Test..............................................................................2-58
2.6.5.11 LCD Backlite......................................................................2-58
2.7 Input/Output Interface ...................................................................................2-59
2.7.1 I/O Interface.......................................................................................2-59
2.7.2 Parallel Interface................................................................................2-63
2.7.3 IEEE-488.2 Interface.........................................................................2-64
2.7.3.1 Formats.................................................................................2-74
2.7.3.2 Sample Program for National Instruments GPIB card.........2-76
2.7.4 RS232 Interface.................................................................................2-77
2.7.5 Results to Printer ...............................................................................2-78

v
Contents (continued)
2.8 Operation with Accessories........................................................................... 2-79
2.8.1 General...............................................................................................2-79
2.8.2 Rack Mount Kit (7000-00)................................................................2-79
2.8.3 BNC Cable Set, 1 Meter (7000-01), 2 Meter (7000-02)...................2-79
2.8.4 Kelvin Clip Leads (7000-03).............................................................2-80
2.8.5 Alligator Clip Leads (7000-04).........................................................2-82
2.8.6 Chip Component Tweezers (7000-05) ..............................................2-83
2.8.7 Low V, Axial/Radial Lead Component Test Fixture (7000-06).......2-84
2.8.8 Low V, Chip component Test Fixture (7000-07)..............................2-85
2.8.9 High Voltage Test Fixture (7000-08)................................................2-87
2.8.10 Calibration Kit (7000-09)..................................................................2-88
2.8.11 Connections to 874 Type Adapters ...................................................2-89
2.9 Error Messages .............................................................................................. 2-90
Theory Section 3
3.1 General...........................................................................................................3-1
3.2 Instrument Description ..................................................................................3-1
3.2.1 Basic I2000 Instrument Architecture ................................................3-1
3.2.2 7600 Instrument Module ...................................................................3-2
3.2.3 I2000 Instrument Options..................................................................3-3
Maintenance/Calibration - Section 4
4.1 General...........................................................................................................4-1
4.2 Instrument Return..........................................................................................4-1
4.3 Routine Maintenance.....................................................................................4-1
4.3.1 Battery Replacement .........................................................................4-1
4.3.2 Bias Voltage Fuse Replacement........................................................4-2
4.3.3 Resetting of Time and Date...............................................................4-2
4.3.4 Loss of Display Contrast...................................................................4-3
4.3.5 Preventive Maintenance/Cleaning.....................................................4-4
4.4 Calibration .....................................................................................................4-4
4.4.1 General...............................................................................................4-4
4.4.2 Calibration Procedure........................................................................4-4

vi

vii
Warranty
QuadTech warrants that Products are free from defects in material and workmanship and,
when properly used, will perform in accordance with QuadTech's applicable published
specifications. If within one (1) year after original shipment it is found not to meet this
standard, it will be repaired, or at the option of QuadTech, replaced at no charge when
returned to a QuadTech service facility.
Changes in the Product not approved by QuadTech shall void this warranty.
QuadTech shall not be liable for any indirect, special or consequential damages,
even if notice has been given of the possibility of such damages.
This warranty is in lieu of all other warranties, expressed or implied, including, but
not limited to any implied warranty or merchantability or fitness for a particular
purpose.
SERVICE POLICY
QuadTech policy is to maintain product repair capability for a period of at least five (5)
years after original shipment and to make this capability available at the then prevailing
schedule of charges.

ix
Specifications
Measurement Capacitance (Cs/Cp), Inductance (Ls/Lp), Resistance (Rs/Rp),
Parameters: Dissipation (DF) and Quality (Q) Factors, Impedance (|Z|),
Admittance |Y|, Phase Angle (θ), Equivalent Series Resistance
(|ESR|), Conductance (Gp), Reactance (Xs), Susceptance (Bp)
Any two parameters measured and displayed simultaneously
Note: s = series, p = parallel, ESR equivalent to Rs
Measurement |Z|, R, X: 000.0001 mohm to 99.99999 Mohm
Ranges: |Y|, G, B: 00000.01 µS to 9.999999 MS
C: 00000.01 fF to 9.999999 F
L: 0000.001 nH to 99.99999 H
D: .0000001 to 99.99999
Q: .0000000 to 999999.9
Phase Angle: -180.0000 to +179.9999 degrees
Delta %: -99.9999 % to +99.9999 %
Measurement Fast Medium Slow
Accuracy: LCR: +/- 0.5%* +/- 0.25%* +/- 0.05%*
DF: +/- 0.005 +/- 0.0025 +/- 0.0005
* At optimum test signal levels, optimum DUT value and without calibration
uncertainty error. Instrument accuracy can be reduced from nominal specifications
when using some 7000 accessory fixtures and cables. Best accuracy requires geometric
consistency between that utilized during open/short zeroing and that utilized on fixtures
and cables during the actual measurement process. This consistency may be especially
difficult to achieve when using unshielded Kelvin clip and tweezer type connections.
0.25 x (normal accuracy) with Load Correction implemented and
compared to user supplied standard.
In a range of 3Ω≤Z ≤80kΩ, 100mV ≤programmed V ≤1V or
100mV ≤(programmed I) x (Z) ≤1V
Test Frequency: 10 Hz to 2 MHz
Resolution: 0.1 Hz from 10 Hz to 10 kHz
5 digits > 10 kHz, 4 digits > 100 kHz
Accuracy: +/- (0.25% + 0.02 Hz)
Measurement Speed: Fast Accuracy: 40 msec*/measurement
Medium Accuracy: 125 msec*/measurement
Slow Accuracy: 1 sec*/measurement
* may be longer, depending on test conditions & frequency
Ranging: Automatic or Range Hold

x
Specifications (continued)
Source Impedance: 25Ω, 400Ω, 6.4 kΩor 100 kΩ, measurement range dependent
Trigger: Internal (automatic) and External (via handler, RS-232 or IEEE-
488.2 interfaces)
AC Test Signal 20 mV to 5.0 V (open circuit) in 5 mV steps, ≤500kHz
Voltage: 20 mV to 1.0 V (open circuit) in 5 mV steps, >500kHz to≤1MHz
20 mV to 0.5 V (open circuit) in 5 mV steps, >1MHz
Accuracy: +/- (5% + 1 mV) <100kHz
+/- (10% + 1 mV) 100kHz to 500kHz
+/- (20% + 1 mV) 500kHz to 1MHz
+/-(35%+1mV)>1MHz
AC Test Signal 250 µA to 100 mA (short circuit) in 50 µA steps
Current: Max Compliance: 3V < 500kHz, 1V from 500kHz - 1MHz
0.5V > 1MHz
Accuracy: +/- (5% +50 µA) <100kHz
+/-(10%+50µA) 100kHz to 500kHz
+/-(20%+50µA) 500kHz to 1MHz
+/-(35%+50µA) >1MHz
Bias Voltage: Internal: 2.0 VExternal: 0 to +/-200 V
Display: LCD Graphics with adjustable contrast and back light
- Results of Dual Measurement Parameters in engineering
(7 digits) or scientific (5 digits) notation
- Deviation from Nominal of Primary Parameter
- % Deviation from Nominal of Primary Parameter
- Instrument Setting and Test Conditions
- Bin Limits and Pass/Fail Results
- Plot of Primary Measurement Parameter vs. Test Conditions
- Table of Measurement Parameters vs. Test Conditions
- Sequenced Test Results Summary
Limit Detection: 15 bins total (10 pass, 4 fail, 1 no contact)
Interfaces: IEEE-488.2, RS-232, Handler, Printer Port and 3.5" Floppy Dr.
Front Panel Four terminal (BNC) with Guard
Test Terminals:
Environmental: MIL-T-28800E, Type 3, Class 5, Style E & F.
Operating: 0 to + 50oC. Storage: - 40 to + 71oC.
Humidity: < 75% for < 40oC operating
Altitude <2000m, Installation Category 1, Pollution Degree 1

xi
Specifications (continued)
Mechanical: Bench mount with tilt bail
Dimensions: (w x h x d): 16 x 6 x 14in
(410 x 150 x 360mm)
Weight: 17 lbs (8kg) net, 23 lbs (10.5kg) shipping
Power Requirements: 90 to 250Vac 47 - 63 Hz 40W maximum
Other Features: Charged Capacitor Protection:
8/ C
for Vmax
≤
250 V
2 / C
for Vmax
≤
1000V
C = Capacitance in farads of the device under test
Measurement Delay programmable from 0-1000 ms in 1 ms steps
Measurement Averaging programmable from 1-1000
Median value Mode
Open and Short Circuit Zeroing at Multiple Frequencies
Power Fail Protection (setting, results, & calibration data stored)
Storage and Recall of 25 Setups, 125/disk w/Floppy Option
Self-Test Routines at Power-up
Stored Results up to 40,000 measurements/disk w/Floppy Option
Self Accuracy Calibration and Display
Contact Check
Supplied: Instruction Manual Power Cable Calibration Certificate
Ordering Description Catalog No.
Information:
7600 Precision LCR Meter, Model B 7600
7600-CE Precision LCR Meter, Model B 7600-CE
7600A Precision LCR Meter, Model B,+/-500V ext bias 7600A
7600A-CE Precision LCR Meter, Model B 7600A-CE
+/-500V ext bias
Options & Accessories:
Rack Mount Kit 7000-00
BNC Cable Set, 1 meter 7000-01
BNC Cable Set, 2 meters 7000-02
Kelvin Clip Leads 7000-03
Alligator Clip Leads 7000-04
Chip Component Tweezers 7000-05
Low Voltage Axial/Radial Lead Component Test Fixture 7000-06
Low Voltage Chip Component Test Fixture 7000-07
High Voltage Test Fixture 7000-08
Calibration Kit 7000-
09

Introduction 1-1
Section 1 Introduction
1.1 Unpacking and Inspection
Inspect the shipping carton before opening, if damaged contact the carriers agent
immediately. Inspect the instrument for any damage. If the instrument appears damaged
or fails to meet specifications notify QuadTech (refer to instruction manual front cover)
or its local representative. Retain the shipping carton and packing material for future use
such as returning for re calibration or service.
1.2 Product Overview
The 7600 Precision LCR Meter is an automatic, user programmable instrument for
measuring a wide variety of impedance parameters. The 7600 covers a frequency range
from 10 Hz to 2 MHz with a basic measurement accuracy of 0.05%. The instruments
high resolution graphics display and keypad makes for easy menu programming. Test
conditions are stored and recalled from internal memory, eliminating wasted
measurement setup time. Extensive pass/fail binning capability and measurements
speeds up to 25/sec makes the unit well suited for production applications.
The instruments unique measurement sequencing allows up to six parameters to be
measured on a single pass. Additionally, a parameter can be plotted against a test
condition variable, an invaluable technique for component design and product evaluation.
The 7600 comes with IEEE-488.2, RS-232, I/O port (handler), and parallel interfaces, all
standard, for remote control operation and communication with other instrumentation. A
3 1/2" floppy drive is also included for program/data storage of test conditions and
measurement results.
DISPLAY SELECT ENTRY TEST
QuadTech 123
456
789
0
-.
STOP
START
C
DF
Freq
Range
Delay
AC Signal
AverageAuto Off
MENU
CNCL
ENTER
FAIL PASS
Precision
!
CAUTION
HIGH VOLTAGE .0000100
17.52520 pF
1.0000kHz
Bias 1
1.0000V
0 ms
7600LCR Meter
Figure 1-1
7600 Precision LCR Meter

Introduction 1-2
1.3 Controls and Indicators
Figure 1-2 shows the controls and indicators on the front panel of the 7600. Table 1-1
identifies them with descriptions and functions.
DISPLAY SELECT ENTRY TEST
QuadTech 123
456
789
0
-.
STOP
START
C
DF
Freq
Range
Delay
AC Signal
AverageAuto 1.0 V
Off
MENU
CNCL
ENTER
FAIL PASS
Precision
!
CAUTION
HIGH VOLTAGE
2
3
4
5
6
7
8
9
10
11 12 131
.0000100
17.52520 pF
1.0000kHz 1
Bias0 ms
7600LCR Meter
Figure 1-2
Front Panel Controls & Indicators
Table 1-1
Front Panel Controls and Indicators
Figure 1-2
Ref.No.Item Function
1 Input Panel BNC connectors, for connection to device
under test (DUT). 7/8 inch spacing.
IL Current, low connection to DUT
PL Potential, low connection to DUT
PH Potential, high connection to DUT
IH Current, high connection to DUT
2 Voltage indicator Indicates when dc bias voltage is called for
or applied to rear panel connectors, from
external source
3 Graphics display Displays test conditions, measured results,
instrument status and user interface menus.

Introduction 1-3
Table 1-1 (continued)
Front Panel Controls and Indicators
Figure 1-2
Ref.No.Item Function
4 Select keys (4) Soft key functions as indicated on the
adjacent LCD display.
- from top to bottom, functions such as up,
down, right or left arrow during menu
selection.
- other functions such as measurement
units, exponent, Y or N (yes or no) and del
(delete).
5 Keypad (12) For making numerical entries as labeled,
0 through 9, minus sign and decimal.
6 CNCL key Exits an active field in vertical or
horizontal selections, clears entry on #
fields when pressed once and exits # fields
whenpressedtwice.
7 MENU key Enters menu display mode or exits sub
menu back to main menu.
8 ENTER key Switches user to entry mode or accepts
menu entry as entered.
9 Pass/Fail indicator Indicates measurement results based on
entered test limits.
10 STOP key Stops the measurement process.
11 START key Starts the measurement process.
12 Power switch Turns main power to instrument on or off.
13 Floppy drive For storing measurement setup conditions
and measurement results. A high density
(1.44M) or low density (720K) DOS
compatible floppy drive. Floppies should
be double sided, formatted for DOS
compatibility.

Introduction 1-4
IEE E-488 IN T ERF ACE
I/O PORT
PARALL EL PORT RS-232INTERFACE BAT TERY
90 - 250 V
47 - 63Hz
40WATTS MAX
BIA S VOLT AG E
200VMAX
1
2
3
4
5
6
7
+ -
Figure 1-3
Rear Panel View
Table 1-2
Rear Panel Connectors and Controls
Figure 1-3
Ref.No.Item Function
1
!AC Inlet Module AC power input, filtering, fusing and
switching. Use with Belden SPH-386
socket or equivalent. Contains
T2.5A,
250V, 5x20mm time delay fuse for 115 or
220V operation. Replace only with the
same type and rating. Also refer to
paragraph 1.6.2.
2 IEEE-488.2 Input/output connections according to IEEE
STD-488.2. 24 pin socket for standard
IEEE-488 cable. Refer to paragraph 2.7.3.
3 I/O Connector Connection to component handler. 36 pin
Amp connector, mates with Amp 552302-1
plug and 552073-5 strain relief cover or
ribbon cable clamp connector 553600-1 or
equivalents. Refer to paragraph 2.7.1.
4 Parallel Port Connection to parallel printer. Type
DB25 (25 pin) female connector. Refer to
paragraph 2.7.2.
5 RS232 Connector Connection according to RS232 std
interface. Type DB9 (9 pin) male
connector. Refer to paragraph 2.7.4.

Introduction 1-5
Table 1-2 (continued)
Rear Panel Connectors and Controls
Figure 1-3
Ref.No.Item Function
6
!Bias Voltage External bias input, maximum of
+/-200Vdc. Contains F0.25A, 250V,
5x20mm fast blow fuse. Replace only with
the same type and rating. Also refer to
paragraph 2.6.2.5.
7 Battery DC source for backup of system memory,
3 standard alkaline AA batteries which
should be replaced annually (Refer to
paragraph 4.3.1)
1.4 Accessories Included
Table1-3
Item Quantity
Instruction Manual 1
Calibration Certificate 1
Power Cord (CE units with international cord set) 1
Fuse (T2.5A, 250V, 5x20mm, for 115/220V operation) 1
1.5 Accessories/Options Available
Table1-4
Item PartNumber
Rack Mount Kit 7000-00
BNC Cable Set, 1 meter 7000-01
BNC Cable Set, 2 meters 7000-02
Kelvin Clip Leads 7000-03
Alligator Clip Leads 7000-04
Clip Component Tweezers 7000-05
Low Voltage Axial/Radial Lead Component Test Fixture 7000-06
Low Voltage Chip Component Test Fixture 7000-07
High Voltage Test Fixture 7000-08
Calibration Kit 7000-09

Introduction 1-6
1.6 Installation
1.6.1 Instrument Positioning
The 7600 contains a high resolution back lit LCD for convenient viewing. The optimum
angle for viewing is straight onto the display. This means that for bench operation the
front bail should sometimes be used to angle the instrument up and for rack installation it
should be mounted somewhat at eye level.
1.6.2 Power Requirements
!The 7600 Precision LCR Meter can be operated from a power source between 90
and 250Vac at a power line frequency of 47 to 63Hz, no line voltage switching is
necessary. Power connection to the rear panel is through an ac inlet module comprised of
an ac connector and fuse drawer. Before connecting the 3-wire power cord between the
unit and AC power the fuse should be in accordance with the power source, T2.5A,
250V, 5x20mm (QuadTech PN 520049) for 115 or 220V source. Always use an outlet
that has a properly connected protection ground. The 7600 is factory shipped with the
2.5A fuse in place. The instrument can be damaged if the wrong fuse is installed.
To change the fuse proceed as follows:
WARNING
MAKE SURE THE UNIT HAS BEEN DISCONNECTED FROM ITS AC POWER
SOURCE FOR AT LEAST FIVE MINUTES BEFORE PROCEEDING.
IEE E-488 IN T ERF ACE
I/O PORT
PARALL EL PORT RS-232INTERFACE BAT TERY
90 - 250 V
47 - 63Hz
40WATTS MAX
BIA S VOLT AG E
200VMAX
+ -
Fuse drawer with release tab
Figure 1-4
Fuse Drawer

Introduction 1-7
•Remove the fuse drawer by inserting a small flat head screwdriver behind the small
tab to force the draw outward. Refer to Figure 1-4.
•Once the fuse drawer has been completely removed from the instrument remove the
clear fuse tray from the drawer by lifting upward slightly on the long narrow black
locking tab. This will allow the fuse tray to be removed from the fuse drawer. This
tray contains the active fuse, left side (secured by holder) and spare fuse on the right
side (if present). Refer to Figure 1-5.
•Remove the active fuse from the holder by prying upward using a small flat head
screwdriver. Insert the replacement fuse into the fuse holder.
•Once the fuse has been installed in the holder and spare fuse (if desired) installed in
the right side of the tray insert the tray back into the fuse drawer, push in and lock.
The two silver contacts on the fuse tray should be positioned towards the outside.
•Once the fuse tray has been installed in the draw, reinstall the fuse drawer back into
the instrument ac inlet module, push in and lock.
Active fuse in holder
this side Spare
fuse
this
side
Locking
tab
Contacts
Figure 1-5
Fuse Drawer
1.6.3 Safety Inspection
!Before operating the instrument inspect the power inlet module on the rear of the
7600 to ensure that the properly rated fuse is in place, otherwise damage to unit is
possible. Refer to paragraph 1.6.2.
The 7600 is shipped with a standard U.S. power cord, QuadTech PN 4200-0300 (with
Belden SPH-386 socket or equivalent, and 3 wire plug conforming to IEC 320) and CE
units with an approved international cord set. Make sure the instrument is only used with
these cables (or other approved international cord set) that ensures the instrument is
provided with connection to protective earth ground.

Introduction 1-8
When the 7600 is used in a rack installation (using the QuadTech 7000-00 Rack Mount
Kit) make sure the unit is secured using the cabinet mounting rails and not secured
solely by the front panel angle brackets.
In bench or rack mount applications the instrument should be positioned with
consideration for ample airflow to the rear panel fan ventilation holes. An open space of
at least 3 inches (75mm) is recommend behind the rear panel. The surrounding
environment should be free from excessive dust to prevent contamination of electronic
circuits.
WARNING
If this instrument is used in a manner not specified in this manual protection to the
operator and equipment may be impaired.

Operation 2-1
Section 2 Operation
2.1 General
Once the 7600 is powered up it is ready immediately for testing, at default test
conditions, by pressing the START button. Power-up default conditions are discussed
in paragraph 2.5.2. Any of these conditions and all other instrument operations can be
changed by easy-to-use menu functions, for simplicity of understanding, descriptions and
uses of all these functions refer to menu discussions in paragraph 2.6. The Contents list
in the front of this manual should be used for quickly locating specify subjects of interest.
NOTE:
For optimum measurement results at specified accuracy a 30 minute instrument
warm-up period is highly recommended.
2.2 Startup
Connect the instrument power cord to the source of proper voltage. The instrument is
to be used only with three-wire grounded outlets. The proper fuse must be installed
as described in paragraph 1.6.2.
Power is applied to the 7600 by pressing the POWER button on the front panel. The
instrument runs a self test and any error messages are displayed accordingly.
2.3 Connection to Device Under Test
The 7600 unit employs a four terminal measurement configuration that permits easy,
accurate and stable measurements and avoids mutual inductance, interference from
measurement signals, noise and other factors inherent with other types of connections.
To help maintain measurement integrity QuadTech makes available a number of
accessory cable sets and fixtures for connection directly to the front panel BNC
connectors. Refer to paragraph 1.5 for a list of available accessories.

Operation 2-2
IL IH
PL PH
Precision
!
CAUTION
HIGH VOLTAGE
7600 LCR Meter
DUT
IH PH PL IL
Ground
For guarded measurements
connect to DUT shield
+-
51 ohms 7600
Figure 2-1 Figure 2-2
Panel Layout Test Lead Configuration
Figures 2-1 and 2-2 show the 7600 connector configuration and a typical four terminal
connection to the device under test. H and L on the 7600 denote polarity of AC test
signal at the measurement terminals as well as + and - polarity of DC bias voltage
when applied to the DUT. Refer to paragraph 2.8 for information on operation and
connection of QuadTech accessory cables and fixtures.
WARNING
When DC bias is applied, the PH connection carries a positive DC voltage with
respect to ground.
2.4 Zeroing
Before making measurements, the 7600 should be zeroed to correct for test lead and/or
fixture errors. During the zeroing process corrections are calculated and stored in
instrument memory and applied to ongoing measurements. Measurement accuracy is
specified at the end of the QuadTech one meter cable (7000-01). Open and short circuit
zeroing should be done at the end of this cable. In order to maintain instrument accuracy
with other cable lengths the instrument should be re calibrated using the QuadTech 7000-
09 Calibration Kit and the alternate cable. Generally the unit should be zeroed at least
once per day and each time test leads or fixture is changed. It is not necessary to re-
zero if the test frequency is changed. The zeroing routine is accessed through the
Utilities Menu as follows:
•Press
MENU key
•Press LEFT/RIGHT ARROW to select Utilities menu
•Press UP/DOWN ARROW key for Open / Short
•Press ENTER

Operation 2-3
Follow the instructions shown on the LCD display for open and short circuit zeroing of
test leads and/or fixture. During the Open Test the leads or fixture should be open with
no component connected. During the Short Test leads should be connected or fixture
shorted (using a clean copper wire, as short as possible). Refer to paragraph 2.6.5.4 as
necessary for more detail. When zeroing, Contact Check should be OFF, # to Average
to 1 and Median OFF.
2.5 Measurement Procedure
2.5.1 General
Whenever the 7600 is powered up it is ready immediately to begin measuring at
default test conditions. Initially, these conditions will be set to factory default but can
be changed by the user and stored to overwrite factory default. To initiate a test once a
device is connected press START, the LCD display shows the measured results and test
conditions similar to the illustration of Figure 2-3. For information on changing test
conditions refer to paragraph 2-6 on Menu Functions.
NOTE:
For optimum measurement results at specified accuracy a 30 minute instrument
warm-up period is highly recommended.
Voltage
Freq
Range
Delay
AC Signal
Average Off0 ms Auto
DF pFCs 17.52510
Measured Parameters
1.000V
1
Bias
RETST
1.0000kHz
0.0000500
Figure 2-3
Measured Results Display
2.5.2 Default Measurement Conditions
A set of default measurement conditions are initially established at the factory and stored
in instrument memory. Default conditions are those that determine the instruments status
on power up, thus the instrument is always set to a known state before any testing begins.
These conditions can be changed by the user for tailoring to a specific application. Refer
to paragraph 2.6.5.1 under Save Setup on the Utilities menu.