4.10 Applying the DC Bias Voltage
4-50 ZM2376
whose impedance is lower than output impedance of the LCR meter, the
charge-/discharging time of DUT can be shortened by decreasing R1.
S1, R2 When you greatly change the bias voltage while the DUT is being connected: if the switch
S1 is closed temporarily, the charge-/discharging time of C2 can be shortened. When
charge-/discharging almost finishes, open S1 to avoid an additional error caused by R2 and
wait settling of the signal before the measurement.
R3 If you need the C2 to be remained in charged state while the DUT is not being mounted,
provide R3.
At a low or high frequency, an additional error that cannot be correct with OPEN and SHORT
correction is often distinguishable. In these situations, perform the LOAD correction if necessary. By
setting the bias voltage to 0 V and measuring a resistor of approx 100Ω with a good frequency
response, you can check an approx additional error.
If a change occurs in the bias voltage, the charge-discharging current of the DUT runs through the
L
CUR
terminal of the LCR meter, and the current sensing circuit of the LCR meter temporarily
saturates to disable the measurement. Also, the change of the bias voltage is applied to the H
POT
terminal through C2, and the voltage sensing circuit of the LCR meter temporarily saturates to
disable the measurement.
Use the bias voltage within the following range:
(|Bias voltage[V]|+ 1.41 × Measurement signal level[Vrms]) < 42[V]
Otherwise, it may cause an electric shock.
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