Contact Check Key; Open Key; Key Lock Key - Agilent Technologies 4349B Manual

4349B

Contact Check Key

The Contact Check key toggles the contact check function ON and OFF. The Contact Check
function detects a broken cable or miss contact. The decision limit value for a contact is
obtained during the OPEN correction procedure. When an OPEN admittance is measured,
non-connection capacitance is measured and stored. The 4349B compares this value and DUT's
capacitance. The Cont Chk annunciator(
state. The default Contact Check function is OFF.

Open Key

The Open key executes the OPEN correction function. The OPEN correction data is used to
cancel the o set error of the 4349B and the leakage of the test xture. The OPEN correction
measures also the stray capacitance for the contact check function. The OPEN correction data
is stored in non-volatile memory (EEPROM).
The o set error of 4349B is temperature dependent. For maximum measurement accuracy,
Perform the OPEN correction after worming up the 4349B (30 minutes).
Perform the OPEN correction when ambient temperature changes more
temperature at which the OPEN correction was performed.
At reset , the correction data is cleared.
Note
OPEN correction must be performed at the condition that test lead or xture
are connected to Ch1, Ch2, Ch3, and Ch4 terminals, without DUT.

Key Lock Key

The Key Lock key toggles the disabling and enabling key input from the front panel. When the
key input is disabled, the Key Lock annunciator(
Note
The key lock state can be controlled also through the handler interface. When
the handler key lock function controls the key lock states, all the front-panel
keys are locked out including
out state from handler.
) indicates if the Contact Check function is in the ON
9
) will be displayed.
9
, so you can only cancel the key lock
5  C from the
6
Function Reference 3-9