User Manual

11
3 Making Measurements
3.1 Open and Short Calibration
The 891 provides open/short calibration capability to have better accuracy in
measuring high and low impedance. It is recommended that the user perform
open/short calibration if the test leads or the test fixture has been changed.
Open Calibration
The open calibration feature compensates for any stray admittances that may
exist within the test fixture or leads. Disconnect any device under test from
the test leads or test fixture and make sure the test terminals are open
(nothing connected). Press SYSTEM → CAL → OPEN CAL keys to start the
open calibration.
Figure 3.1 – Open Calibration
This open calibration takes about 1 minute to complete. After it is finished,
the 891 will beep rapidly to inform that the calibration is done.
Short Calibration
The short calibration feature compensates for any residual impedances that