User`s guide

Agilent 4155C/4156C User’s Guide Vol.2, Edition 6 7-43

Measurement Units and Functions

QSCV Zero Offset Cancel

This function is available for the quasi-static CV measurements. This function

enables you to minimize measurement error (offset) caused by stray capacitance of

cables, prober, and so on.

To Measure Offset Data

Measure the offset data, as follows:

1. Set the measurement conditions on the MEASURE: QSCV SETUP and

MEASURE: QSCV MEASURE SETUP screen.

The QSCV measurement setup must be completed before executing the offset

measurement. The offset measurement uses setups on the screen. See Table

7-27.

2. Open the measurement terminals at the cable end of the device side.

3. Select the ON softkey in the ZERO CANCEL field on the MEASURE: QSCV

MEASURE SETUP screen.

4. Press the green key and

Stop front-panel key in this order.

The measurement unit executes a one-point capacitance measurement between

the start voltage and the stop voltage shown in Table 7-27. And the measured

offset data is displayed in the field right next to the ZERO CANCEL field. The

initial offset data is 0.

NOTE Invalid Offset Data

If one of the following conditions is detected during the offset measurement, an

error message is displayed, and the offset data measurement is aborted.

• Integration time is too short for the offset measurement

• Leakage current is more than 70% of the measurement range

When this happens, change the measurement conditions and execute the offset

measurement again.