User Manual SM6026
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coupling cannot be eliminated, it will bring unexpected influence on test results. Generally, contact
resistance affects the resistance of impedance and electromagnetic affects the reactance of impedance.
Test terminals can adopt 4TP connection method. For 4TP connection, the currents flow though Hc and
Lc are equal in value and opposite in direction with those flowing through each shielding terminals. By
this way, the magnetic fields produced by these currents can be mutually offset and further eliminate the
influence of mutual inductance coupling on test results.
5.4 Operation example for testing inductance with SM6026
Test Condition
Function: Ls-Q
Frequency: 5.5kHz
Level: 1.5Vrms
Internal impedance: 100Ω
Operation steps
1) Turn on the instrument.
2) Set basic parameters
a) Press [DISP] to enter into the <MEAS DISP> page.
b) Use the knob to move the cursor to FUNC, the current item is displayed as Cp-D. Meanwhile
Cp—…→
，
Cs—…→
，
Lp—…→
，
Ls—…→
，
Z—…→, ↓ will be displayed in the soft key zone.
c) Press the soft key Ls—…→, Ls-D, Ls-Q and Ls-Rs will be displayed.
d) Press Ls-Q to select the Ls-Q function.
e) Move the cursor to
Freq
., the current frequency is 1.0000kHz.
f) Press [5][.][5], +5.5 will be displayed in the prompt information zone at the bottom of the screen. The
available units Hz, kHz and MHz will be displayed in the soft key zone. Press kHz, the frequency will
be changed as 5.5000kHz.
g) Move the cursor to
LEVEL
, the current displayed level will be 1.000V.
h) Press [1][.][5], +1.5 will be displayed in the prompt information zone at the bottom of the screen. The
available units mV, V, μA, mA and A will be displayed in the soft key zone. Press [ENTER], the level will
be changed as 1.5V.
i) Press [SETUP] to enter into the <MEAS SETUP> page.
j) Move the cursor to R
int
zone, 100Ω , 50Ω , 30Ω and 10Ω will be displayed in the soft key zone.
k) Press 100Ω to select 100Ω as the signal internal impedance.
3) Connect the test fixture to the test terminals of SM6026 A.
4) Execute correction (To avoid the influence of stray impedance on measurement accuracy, Open/ Short
correction must be operated) (refer to 5.1.2 “Point-frequency correction”)
5) Mount the tested inductance to the test fixture.
6) Execute test operation.
Press [DISP] to enter into the <MEAS DISP> page. The instrument can test continuously and the test
result will be displayed in upper case character in the center of the page.
7) If the test result is obviously incorrect, please check the following items.
a) Check the tested inductance is in good connection with the test fixture or not.
b) Check the test fixture is in good connection with the test terminals of the instrument or not.
c) Redo the open/short correction.
NOTE
: When the sweep open/short correction is used, the point-frequency correction function should be
set as OFF. Refer to Correction operation in this section.
