Stanford SR715 and SR720 LCR Meters

Stanford SR715 and SR720 LCR Meters
LCR Meters
SR715 and SR720  LCR meters with RS-232 interface
SR715/SR720 LCR Meters
· 0.05 % basic accuracy (SR720),
0.2 % (SR715)
· 5-digit display of L, C, R and Q or D
· Test frequencies to 100 kHz (SR720)
· Up to 20 measurements per second
The SR715 and SR720 LCR Meters measure passive
components with as little as 0.05 % error. These easy-to-use
instruments are quick to setup, adjust and calibrate. The
SR715 and SR720 are ideal for applications such as incoming
inspection, quality control, automated test and general
benchtop use.
Front-Panel Display
· External capacitor bias up to 40 V
A 5-digit LED display shows measured values, entered
parameters, instrument status and user messages. When
making measurements, the major parameter (L, C or R) is
shown on the left display and the appropriate minor parameter
(Q, D or R) is shown on the right display.
· RS-232 computer interface
Making Measurements
· GPIB and Parts Handler interfaces (opt.)
Measurements can be performed at test frequencies of 100 Hz,
120 Hz, 1 kHz, 10 kHz and 100 kHz (SR720 only). A built-in
drive voltage can be set to preset values (0.1, 0.25 and 1.0 V)
or adjusted from 0.1 to 1.0 V in 50 mV increments.
· Binning and limits for part sorting
Measurements are taken at rates of 2, 10 or 20 samples per
second. Consecutive readings can be averaged between two
and ten times for increased accuracy. Both series or parallel
equivalent circuit models of a component are supported.
Capacitor measurements use either the internal 2.0 VDC bias
or an external DC source of up to 40 volts.
Stanford Research Systems
Distribution:
ROHDE & SCHWARZ Vertriebs GmbH
WWW.ROHDE-SCHWARZ.COM
Tel. +49 89 4129 13774
Fax. +49 89 4129 13777
e-mail: CustomerSupport@ROHDE-SCHWARZ.COM
SR715 and SR720 LCR Meters
Simple to Operate
The power and flexibility of the SR715/720 does not come at
the expense of ease-of-use. A convenient AUTO measurement
mode automates the selection of setup parameters and quickly
determines the appropriate device model for whatever
component is being measured. Up to nine instrument setups
can be stored in non-volatile memory for quick recall at a later
time.
nested) bins have one nominal value and are sorted into
progressively larger bins (i.e., ±1 %, ±2 %, ±3 %). Sequential
bins can have different nominal values, each separated by a
percentage or a nominal value and asymmetrical limits.
Binning parameters are also easily stored in non-volatile
RAM for quick setup in production environments.
Test Fixtures
The SR715 and SR720 have a kelvin fixture which uses two
wires to carry the test current and two independent wires to
sense the voltage across the device under test. This prevents
the voltage drop in the current carrying wires from affecting
the voltage measurement. Radial components are simply
inserted into the test fixture, one lead in each side. Axial
devices require the use of the axial fixture adapters (provided).
Surface-mount devices, or components with large or
unusually shaped leads, can be measured with optional SMD
Tweezers (SR727) or Kelvin Clips (SR726). The tweezers and
clips attach directly to the LCR meter’s front-panel test
fixture. An optional BNC Fixture Adapter (SR728) allows you
to connect a remote fixture or other equipment through one
meter of coaxial cable.
SR728 BNC Adapter
Convenient Calibration
The SR715 and SR720 make it simple to compensate for lead
impedance and stray fixture and cable capacitance. The null
calibration procedure automatically corrects both open and
short circuit parameters at all frequencies and all ranges.
Binning
The SR715 and SR720 have built-in features to aid in
component sorting. This is especially useful for production
testing, incoming inspection, device matching or when you
need to test multiple devices of similar value. The meters
allow you to sort components into as many as ten different bins.
SR727 Surface Mount Tweezers
Rear Panel
The SR715 and SR720 support three types of binning
schemes: pass/fail, overlapping and sequential. Pass/fail has
only two bins; good parts and everything else. Overlapping (or
Two rear-panel input connections are provided for an external
bias voltage. Voltages as high as 40 VDC can be used. An
optional handler interface provides control lines to a
component handler for sorting. A standard RS-232 interface
allows complete control of all instrument functions by a
remote computer. A GPIB interface is included with the
handler option.
SR726 Kelvin Clips
SR715/SR720 rear panel (with opt. 01)
Stanford Research Systems
Distribution:
ROHDE & SCHWARZ Vertriebs GmbH
WWW.ROHDE-SCHWARZ.COM
Tel. +49 89 4129 13774
Fax. +49 89 4129 13777
e-mail: CustomerSupport@ROHDE-SCHWARZ.COM
SR715 and SR720 Specifications
Measurement modes
Equivalent circuit
Parameters displayed
Basic accuracy
Auto, R+Q, L+Q, C+D, C+R
Series or Parallel
Value, Deviation, % Deviation or
Bin Number (Deviation and
% Deviation are calculated relative
to a stored value.)
SR715: 0.2 %, SR720: 0.05 %
(see graphs for details)
Fixture
Fixture
Fixture protection
4-wire kelvin fixture for radial
leaded parts with adapters for axial
leaded parts.
Protected up to 1 Joule of stored
energy and 200 VDC (for charged
capacitors). Fused at 0.25 A output
current for biased measurement.
Measurement Range
Calibration
(R+Q mode)
R
Q
(L+Q mode)
L
Q
(C+D mode)
C
D
(C+R mode)
C
R
0.0001 Ω to 2000 MΩ
0.00001 to 50
Zeroing
Open and short circuit
compensation
0.0001 µH to 99999 H
0.00001 to 50
Compensation limits
Short: R <20 Ω, Z <50 Ω,
Open: Z >10 kΩ
0.0001 pF to 99999 µF
0.00001 to 10
General
Store and recall
0.0001 pF to 99999 µF
0.00001 Ω to 99999 kΩ
Electrical
Test frequency
Frequency accuracy
Drive voltage
Drive level accuracy
Bias voltage
Fixed frequencies at 100 Hz,
120 Hz, 1 kHz, 10 kHz (SR715 and
SR720), 100 kHz (SR720 only)
±100 ppm
Preset levels: 0.10, 0.25, 1.0 Vrms
Vernier: 0.1 to 1.0 Vrms with
50 mV resolution
±2 %
Internal: 2.0 VDC ± 2 %
External: 0 to +40 VDC, fused
at 250 mA
Store/recall up to nine complete
instrument setups.
RS-232
Standard interface. All instrument
functions can be controlled or read
over the interface.
GPIB and Handler
Optional IEEE-488.2 and Handler
interface. Handler interface uses a
DB25 connector, positive logic for
binning and control.
Operating temperature 0 °C to 35 °C
Relative humidity
<85 %
Power
20 W, 100/120/220/240 VAC,
50 or 60 Hz
Dimensions
13.5" × 4" × 14" (WHD)
Weight
10 lbs.
Warranty
One year parts and labor on defects
in materials and workmanship
Features
Averaging
Measurement rate
Ranging
Triggering
Binning
2 to 10 measurements
Slow, Medium, Fast: 2, 10 or 20
measurements per second at test
frequencies of 1 kHz and above and
about 0.6, 2, 4 or 6 measurements
per second at 100 Hz and 120 Hz.
Auto or Manual
Continuous, manual or remote
over RS-232, GPIB or Handler
interface
Up to 8 pass bins, QDR and general
fail bins, defined from the front
panel or over the computer
interfaces. Binning setup may be
stored in non-volatile memory.
Stanford Research Systems
Ordering Information
SR715
SR720
Option 01
SR726
SR727
SR728
10 kHz LCR meter w/ RS-232
100 kHz LCR meter w/ RS-232
GPIB and parts handler interface
Kelvin clips
Surface mount tweezers
4-wire BNC adapter
Distribution:
ROHDE & SCHWARZ Vertriebs GmbH
WWW.ROHDE-SCHWARZ.COM
Tel. +49 89 4129 13774
Fax. +49 89 4129 13777
e-mail: CustomerSupport@ROHDE-SCHWARZ.COM
SR715 and SR720 Specifications
SR715 Capacitance Accuracy
SR720 Capacitance Accuracy
10
10
100Hz
100Hz
10kHz
100kHz
1
1
% Error
% Error
1kHz
10kHz
1kHz
.1
.01
.01p
.1
.1p
1p
10p 100p
1n
10n 100n
1µ
10µ 100µ
1m
10m 100m
.01
.01p
.1p
1p
10p 100p
Capacitance (Farads)
1n
10n 100n
1µ
10µ 100µ
1m
10m 100m
1k
10k 100k
Capacitance (Farads)
SR715 Inductance Accuracy
SR720 Inductance Accuracy
10
10
100Hz
1
100Hz
10kHz
100kHz
10kHz
1
1kHz
% Error
% Error
1kHz
.1
.1
.01
10n 100n
.01
1µ
10µ 100µ
1m
10m 100m
1
10
100
1k
10k 100k
10n 100n
1µ
10µ 100µ
Inductance (Henrys)
1m
10m 100m
1
10
100
Inductance (Henrys)
SR720 Resistance Accuracy
SR715 Resistance Accuracy
10
10
1
1
100kHz
10kHz
% Error
% Error
10kHz
.1
.1
100Hz
1kHz
100Hz
1kHz
.01
10m
100m
1
10
100
1k
10k 100k
Resistance (Ohms)
1M
Stanford Research Systems
10M
100M
1G
.01
10m
100m
1
10
100
1k
10k
100k
1M
10M
100M
Resistance (Ohms)
Distribution:
ROHDE & SCHWARZ Vertriebs GmbH
WWW.ROHDE-SCHWARZ.COM
Tel. +49 89 4129 13774
Fax. +49 89 4129 13777
e-mail: CustomerSupport@ROHDE-SCHWARZ.COM
1G
SR715 and SR720 LCR Meters
Ideal Device Models
All non-ideal passive devices (resistors, inductors and
capacitors) can be modeled as a real component (resistor)
either in series or in parallel with a reactive component
(capacitor or inductor). The impedance of these components
change as a function of frequency. The series and parallel
models are mathematically equivalent and can be transformed
back and forth with the equations shown. The SR715 and
SR720 can switch between either parallel or series equivalent
circuits.
Usually one model is a better representation of the device
under operating conditions. The most accurate model depends
on the device and the operating frequency. Certain devices are
tested under conditions defined by the manufacturer or
industry standard. For example, electrolytic capacitors are
often measured in series at 120 Hz in the C+R mode, so the
Rs
ESR (equivalent series resistance) can be measured. The
equivalent series resistance in capacitors includes things like
dielectric absorption in addition to the ohmic losses due to
leads. It is often listed on data sheets for electrolytic capacitors
used in switching power supplies. At high frequencies, the
ESR is the limiting factor in the performance of the capacitor.
The quality factor, Q, is the ratio of the imaginary impedance
to the real impedance. For inductors, a high Q indicates a more
reactively pure component. A low Q indicates a substantial
series resistor. Q varies with frequency. With resistors, often
all that is stated is that the resistor has low inductance.
The dissipation factor, D, is equal to 1/Q and is the ratio of the
real impedance to the imaginary impedance. A low D indicates
a nearly pure capacitor. D is commonly used when describing
capacitors of all types.
Ls
Rs
Cs
Rp
Rp
Lp
Cp
Z s = R s + jωL s = R s (1 + jQ) = ωL s
Zp =
Q=
Ls =
Rp =
jωL pR p
R p + jωL p
Rp
=
ωL p
Q
=
R p (1 + jQ)
1+ Q
ωL s
Q=
Rs
2
Lp
1
Y = Gp −
Rs =
Bp = −
Gp
Z s = Rs − j
1
1
j
=
(D − j) = Rs 1− 
D
ωCs ωCs
2
2
1+ Q
 1 + j
Q 
ωL s
Q
Zp =
1
D
1 + jωRpCp
D = ωRsCs =
R p = QωL p
j
Rp =
1
Gp
=
1
jωCp
1 + D2
1
ωRpCp
Cs = (1 + D2 )Cp
1
ωL p
D2Rp +
Rp
Rs =
D=
1
Q
D2
Rp
1 + D2
Bp = ωCp
Y = Gp + jωCp
ωL p
Stanford Research Systems
Distribution:
ROHDE & SCHWARZ Vertriebs GmbH
WWW.ROHDE-SCHWARZ.COM
Tel. +49 89 4129 13774
Fax. +49 89 4129 13777
e-mail: CustomerSupport@ROHDE-SCHWARZ.COM
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