B&K Precision 886 - Manual - Manual (Page 27)

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2.2.3 Open and Short Calibration
The Models 885 & 886 provides open/short calibration
capability so the user can get better accuracy in measuring high and
low impedance. We recommend that the user performs open/short
calibration if the test level or frequency has been changed.
 Open Calibration
First, remaining the measurement terminals with the open status,
then press the CAL key shortly (no more than two second), the
LCD will display:
This calibration takes about 10 seconds. After it is finished, the
Model 885 will beep to show that the calibration is done.
 Short Calibration
To perform the short calibration, insert the Shorting Bar into the
measurement terminals. Press the CAL key for more than two
second, the LCD will display:
This calibration takes about 10 seconds. After it is finished, the
Model 885 will beep to show that the calibration is done.