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Model 3550 LCR Meter Instruction Manual Operating Instructions
Operating the 3550
Preparation
Check the Power Source Voltage. The voltage range of this machine is displayed on the rear of
the machine. The power voltage may be selected using the switching plug on the rear panel. See
“Preparation for Use” for more setup details.
When the [POWER] Switch is turned ON the settings of the machine will be same as when the
power was previously turned off. In order to reset the 3550, simply press [MAN/EXT] at the same
time the [POWER] key is pressed. Resetting will clear the zero correction factors and return the
instrument settings to factory defaults. A table summarizing the factory default settings can be
found in Chapter 3, Quick Start Instructions.
How to Perform a Zero Correction
Determine whether test leads, an adapter or some other fixture will be used to make
measurements and connect it to the front panel BNC terminals. Perform a Standard, Frequency
Limit, or Spot Frequency Zero Correction for both open and closed circuit conditions. To perform a
standard zero correction, follow the instructions below:
a) With the tips of the test leads or the adapter in an "open" condition, push the [OPEN]
switch. DISPLAY A will show “OP–57” to indicate that an open correction is being
performed and “57” will indicate what step frequency the instrument is adjusting for.
The instrument will count down from “57” to “1”. Do not touch or adjust the test
leads/fixture while the zero correction procedure is taking place.
b) Once the “OPEN” correction is completed the unit will return to the measurement mode.
Connect the test leads/fixture in the "shorted" position (see Figure 4.X) and press the
[SHORT] key. The instrument will execute the short circuit correction procedure.
During the Open or Short Circuit Zero Correction process, if the Correction Value min/max
threshold is exceeded, a warning buzzer will sound 3 times to warn that the correction could not
be done. If this happens, lower the parasitic Impedance, and re-do the correction. If the test
leads/fixture continue to fail the zero correction, double check that the operating frequency range
of the leads/fixture have not been exceeded. See “Test Fixture Selection” to determine whether
the test frequency range of your test leads/fixture have been exceeded and whether a Frequency
Limit or Spot Frequency Zero Correction need to be performed instead of a Standard Zero
Correction. Frequency Limit and Spot Frequency Zero Corrections allow the user to define the
specific frequencies to be open and short compensated. Frequency Limit and Spot Frequency
Corrections can also be used to shorten the total zero correction time by ignoring unused test
frequencies.
If the proper frequency correction has been performed and the test leads/fixture continues to fail
zero correction, have the leads/fixture tested by an authorized service person.
!
Detailed instructions for performing "open " or "short” circuit zero corrections are found in the
“Measurement Tips” and in “Front panel Description” sections of this manual. Make sure that front
panel operation and LCR measurement technique is thoroughly understood before proceeding
further. LCR measurement can be quite complex and the slightest overlooked detail could greatly
affect measurement accuracy. To maximize measurement accuracy it is highly recommended that
this chapter be understood in its entirety.
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