36
measurement status is shown in table 3-1.
outer
function
parameter
frequency
level
display
range
speed
clear
parameter
C-D
note
1kHz
1.0V
direct
auto
slow
open
inner
function
alarm
trigger
equivalent
serial
interface
sorting
mode
source
resistance
Key
lock
parameter
off
off
serial
connection
receiving
only
3-pin
sorting
30
Ω
off
Table 3-1 Default status
Note: TH2775B’s default parameter is L-Q.
2. Select measurement parameter: L/Q, C/D, R/Q, Z/Q or R/D (only for
TH2618B).
3. If necessary, select equivalent mode, referring to §2.3.3 on P2-19.
NOTE 1
4. Select measurement frequency and test signal level.
5. If necessary, select suitable signal source resistance, referring to §2.3.6 on
P2-19.
NOTE 2
6. Connect test fixtures or cables. Test fixture TH26001 and 4-terminal Kelvin
test cable TH26004 are equipped along with the equipment. Test fixture
Th26005 is optional for meter with little space between components, and
TH26009 is for SMD component.
7. Perform a short correction, using a shorting bar to test fixture or cable.
8. Perform an open correction without the shorting bar.
NOTE 3
9. Connect the component to the test terminals and the measurement values
are displayed in Display A and B.
Note 1: When the DUT’s Q or D is large enough, even close to 1, the
measurement values in serial and parallel connections differ a lot.
For example, a capacitance in serial model is Cs = 0.1
μ
F, and dissipations
respectively are D1 = 0.0100, D2 = 0.1000 and D3 = 1.0000, then according to
fourmula Cp=Cs/(1+D
2
), capacitances in parallel model are:
Cp1 = 0.09999
μ
F
Cp2 = 0.09901
μ
F
Cp3 = 0.05
μ
F
You can find that, when D<0.01, the difference between Cs and Cp is very small,
but while D>0.01, the difference will be very obvious. For example, when D =
0.1, the difference between Cs and Cp in percentage is approx. 1%, while D =
1, the difference in percentage will be approx. 100%.
Note 2: At the time of measuring component which is sensitive to signal, such as
core inductor, ceramic capacitor, it should be compared with the same signal to
keep the consistency. In this case, not only test signal level should be selected,
but also signal source resistance.
For example, a ceramic capacitor is measured by HP4284A to be of the
parameter of 0.1
µ
F, but it’s measured to be 0.11
µ
F by TH2810B at the same