4-2
Model 3550 LCR Meter Instruction Manual Operating Instructions
Basic Operation
The Model 3550 is a fully programmable LCR meter, designed for use in many different low and
high frequency applications. There are ideal configurations of the 3550 for each type of
measurement. These configurations optimize test conditions while enhancing accuracy and
measurement speed. In order to maximize the effectiveness the 3550, the user should have a
thorough understanding of the instrument’s operation along with a basic knowledge of LCR
measurement techniques. This section will provide the user with the necessary information to
make accurate and repeatable measurements.
Default Parameters
Each unit is delivered from the factory with predefined settings intended for general-purpose LCR
measurement and ease of use. Chapter III, Quick Start Instructions, contains information on
factory default settings.
!
CAUTION:
NEVER APPLY DIRECT CURRENT TO THE MEASUREMENT TERMINALS
Never apply direct voltage to the measuring terminals. When testing capacitors, always make
sure that they are fully discharged otherwise damage to the instrument will result.
NEVER MEASURE COMPONENTS IN A POWERED CIRCUIT
If you are measuring components, which are integrated into circuit boards, always check that
power is disconnected from the circuit before taking measurements. When measuring
transformers, always verify that no induced voltage is present before making connections.
Measurement Tips
Making Measurements that are Sensitive to Voltage and Current
The measured values of many components such as core-filled coils, layered ceramic capacitors etc.
are dependent upon the applied level of test current or voltage. In applications where the test
signal must remain constant, it is recommended that the range of the 3550 be manually set.
In the event that AUTO Range must be used, then operation of the 3550 in the “Constant Current”
or “Constant Voltage” Mode will maintain signal levels while allowing range adjustments.
Measuring Earth-Grounded Test Pieces
The L-side (L
FORCE
& L
SENSE
) of the measurement terminals is set up to be the virtual grounding
point of the internal amplifiers. The L-side is a high-impedance point with zero electrical potential.
These terminals cannot be directly connected to Earth Ground. Measurement of devices with one
lead tied to earth ground is not recommended.
To Next Page
Loading...
