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The SR715 LCR Meter and SR720 LCR Meter 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
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.
Making Measurements
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.
Measurements are taken at rates of 2, 10 or 20 samples per second.
Consecutive readings can be averaged between 2 and 10 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.
Simple to Operate
The power and flexibility of the SR715 LCR meter and SR720 LCR
meter 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.
Convenient Calibration
The SR715 and SR720 LCR meteres 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.
The SR715 and SR720 LCR meters support three types of binning schemes:
pass/fail, overlapping and sequential. Pass/Fail has only two bins;
good parts and everything else. Overlapping (or nested) bins have
one nominal value and are sorted into progressively larger bins
(e.g., ±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 LCR meters 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.
Rear Panel
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.
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