Obtaining (Measuring) Data For Load Correction - Keysight E4981A User Manual

Preparation for Accurate Measurement (Executing Correction)
Obtaining Correction Data

Obtaining (measuring) data for LOAD correction

Preparing the standard for LOAD correction
To measure the data for the LOAD correction, you must first prepare a device
as the standard used for this measurement. You can use any device that has a
stable known value as the standard. Also, the type of standard and the type of
DUT can be different. For example, even if you measure a capacitor, you can
use a resistor as the standard.
When using an existing standard:
Any device that has an accurate value (guaranteed as the specification) can be
used as the standard.
When using a general purpose capacitance component as the standard:
If you cannot prepare an existing standard, value a general purpose device
(capacitor, resistor, and so on) by using a Capacitance meter and use it as the
standard. Notes on selecting a device to use as the standard are given below.
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You must value the standard as accurately as possible. The valuing procedure
is described below.
Step 1. Connect the direct coupled test fixture to a Capacitance meter and execute
OPEN/SHORT correction.
Step 2. Set the measurement frequency of the Capacitance meter to the frequency
(120 Hz/1 kHz/1 MHz) actually used when measuring the data for the LOAD
correction.
Step 3. Set up the Capacitance meter under measurement conditions that allow
high-accuracy valuing (measurement) (for example, setting up the
measurement time to 8 or increasing the averaging count).
Step 4. Connect a device you use as the standard to the direct coupled test fixture and
perform the measurement. Use the obtained measured value as the standard
for the LOAD correction.
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When you measure DUTs with a fixed impedance value, use a device with
an impedance close to the fixed value. On the other hand, when you
measure DUTs of several different values, use a device whose impedance
can be valued accurately within a range of approximately 100 to 1 kΩ.
Use a stable device that is not sensitive to factors of the measuring
environment such as temperature and magnetic field.
Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter