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Floating
When the M9614A/M9615A is shipped from the factory, the Low force terminal is
connected to the frame/chassis terminal by using the short bar. The short bar
must be connected to perform the grounded measurement.
If you want to perform the floating measurement or if you want to connect another
instrument's ground to the Low force, remove the short bar, and leave the
terminals open. Then use the Low force terminals on the D-sub connector to
connect the other instrument.
For the floating measurement, do not apply voltage over 40 V to the Low force
terminal. Doing so will damage the M9614A/M9615A.
Do not apply current or voltage to the frame/chassis terminal. Doing so will
damage the M9614A/M9615A.
To prevent electrical shock, do not touch any of measurement circuit at any time
while a floating measurement is in progress. Also use accessories that comply
with IEC 61010-031. All terminals and the extended conductors must be isolated
by using insulation caps, sleeves, etc.
Afin d'éviter toute décharge électrique, ne touchez aucune mesure de circuit à
tout moment lorsque la mesure de flotte est en cours. Utiliser également des
accessoires qui sont conformes à la norme IEC 61010-031. Toutes les bornes et
les conducteurs prolongés doivent être isolés en utilisant des bouchons
d'isolation, des manchons, etc.
Guarding
Guarding reduces the leakage current between the instrument and a DUT. This is
important when you perform low current measurements.
The overview of the guard technique for the grounded measurement is shown in
Figure
measurement environment: extension cable, test fixture, shielding box, and so on.
It is important to use a triaxial cable such as Keysight PX0102A-001 Low noise
triaxial cable (1.5 m). The buffer amplifier keeps the potential of the Guard at the
Keysight M9614A/M9615A Startup Guide, Edition 1
1-4. The guard shield is necessary to prevent the leakage current in the
Connecting a DUT
27
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