Measurement Contacts; Capacitance To Ground - Keysight E4980A User Manual

Measurement Procedure and Examples

Measurement Contacts

Measurement Contacts
This section gives general advice and techniques for using the four-terminal
pair configuration efficiently. To take accurate measurements using this
technique, the following steps are required to prepare measurement contacts
(the number labels in the following description correspond to the numbers in
Figure
1. The signal path between the E4980A/AL and the DUT should be as short as
2. To construct the four-terminal pair measurement circuit configuration, the
3. Keep connections between the point at which the shielding ends and DUT
Figure 7-8 Measurement contacts
The following sections offer some techniques for using the four-terminal pair
configuration effectively and efficiently.

Capacitance to Ground

In measuring capacitors of 10 pF or less, the stray capacitance (when the
conductors are grounded, this is capacitance to ground) between the
measurement contacts and the conductors near the capacitor influences the
measurement as shown in
Keysight E4980A/AL Precision LCR Meter
7-8).
possible.
outer shields of the HCUR and HPOT, LCUR and LPOT terminals must be,
respectively, connected together at the nearest point possible to the point
at which the DUT will be connected.
as short as possible.
Figure 7-9.
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