U2829 Series Operation Manual Chapter 5 Execute LCR Operation and Some Examples
53
displayed in the soft key zone.
c)
Press
ON
to turn on the open correction function.
d)
Move the cursor to the
Short
zone,
ON
,
OFF
and
SWEEP SHORT
will be
displayed in the soft key zone.
e)
Press
ON
to turn on the short correction function.
f)
Move the cursor to the
LOAD
zone,
ON
,
OFF
will be displayed in the soft key
zone.
g)
Press
OFF
to turn on the load correction function.
h)
Move the cursor to the
FREQ
zone,
ON
,
OFF
,
SPOT OPEN
,
SPOT SHORT
and
MEAS LOAD
will be displayed in the soft key zone.
i)
Press
ON
to turn on the point-frequency correction function of
Freq
.
j)
Press [5] [.] [5], +5.5 will be displayed in the prompt information zone at the
bottom of the screen meanwhile the available units (
Hz
,
kHz
and
MHz
) will
be displayed in the soft key zone. Press
kHz
, the
FREQ 1
zone will be
changed as 5.5000kHz (be the same as that of test frequency).
k)
Keep the test fixture be in open status and press
SPOT OPEN
to execute
open correction.
l)
Insert the short plate (U26010) to the test fixture.
m)
Press
SPOT SHORT
to execute short correction.
5.2
Correct connection of DUT
There are 4 pairs of test terminal: Hcur, Hpot, Lpot and corresponding shielding
terminal of each terminal.
Each terminal contains shielding layer whose function is to reduce the influence of
the ground stray capacitance and the interference of the electromagnetic field. In
the process of testing, Hcur, Hpot and Lpot, Lcur should be connected with DUT
lead to form a complete 4-terminal measurement, thus reducing the effect of the
lead and the connection points on the test results (especially the dissipation
measurement). When testing low-ohm components, Hpot, Lpot should be
connected to the lead terminal so as to avoid the impedance being added to the
lead impedance and the connection principle is that the Hpot and Lpot test should
be the actual existed voltage on DUT.
In other words, before connecting to DUT, it is not recommended to connect Hcur,
Hpot with Lpot, Lcur, for doing this will increase test error.
If the connection point and the lead resistance R lead are far weaker than the
tested impedance (for example: Rlead<Zx/1000, the accuracy error is required
to be less than 0.1%), before connecting to DUT, it is recommended to connect
Hcur, Hpot and Lpot, Lcur (Two terminal test).
In the test with high accuracy requirement, using Kelvin test fixture (standard
accessory) will gain better results than using test leads. When Kelvin test lead is
used under 10kHz, a better measurement result can be obtained. However, when
the frequency is higher than 10kHz, it cannot meet the measurement demand. In
high frequency, the change of the clearance between test leads will directly
