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OPERATION
Offset compensates for the stray admittance, and the OQ offset compensates for the residual
impedance.
To perform the offset compensation, select the offset compensation mode by pressing the
' OS OFFSET
' on OFFSET ' or ' OS&on OFFSET ' softkey. If the OS & 0 O offset compen¬
sation is selected, the ' OS ' and ' on ' softkeys are displayed on the softkey area. If the OS
offset or 0 n offset compensation is selected, one of these softkeys is displayed. To perform
the offset compensation, short ( or open ) the measurement terminal on the test fixture, and
press the ' OQ ( or OS ) ' softkey and ENTER/EXECUTE key.
NOTE
The test fixture must be configured the same as it will be for performing com¬
pensation and for making a measurement.
3"6. TEST SIGNAL LEVEL AND OUTPUT IMPEDANCE
The test signal level applied to OUT depends on the test signal level applied from the 4195A,
the output Impedance.and insertion loss of the Impedance Test Adapter, and the impedance
of OUT. The 41951A's output impedance is approximately 50 O.
The equivalent circuit and equation to calculate the test signal level is shown in Figure 3-3.
A\
e = V
X
ZL / { 2
X
( ZL + 50 )} [V]
Where
V: 4195A's output Signal Level [V]
ZL: impedance of OUT [O]
e; Test Signal Level at DUT
Figure 3-3. Test Signal Level Calculation
The calculation example of the test signal level at DUT is shown in Table 3-2.
Table 3-2. Test Signal Level
Impedance
of DUT
OdBm
IV
infinite
112 mV
0.5 V
1 kCi
106 mV
0.48 V
100 0
75 mV
0.33 V
50 Q
56 mV
0.25 V
3"4
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