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GPT-9000/9000A Series User Manual

2. Use the UP/DOWN arrow keys to

move to the MAX HOLD setting.

3. Use the scroll wheel to set MAX

HOLD.

MAX HOLD

OFF, ON

4. Press the EDIT/SAVE key to save

and exit the MANU Utility menu.

EDIT/SAVE

Note

The ESC key can be pressed at any time in the

MANU Utility menu to cancel and exit.

Setting the Grounding Mode

Background

When GROUND MODE is set to ON, the GPT-

9000/9000A grounds the return terminal to the

ground. This mode is best for DUTs that are

grounded to an earth ground by their chassis,

fixtures or operation environment. This mode

measures the potential of the HIGH VOLTAGE

terminal with respect to earth ground. This

means that any stray capacitance/resistance

that leaks to earth ground will also be

measured. This is the safest testing mode,

though potentially not as accurate.

When GROUND MODE is set to OFF, the

return terminal is floating with respect to the

earth ground. This mode is for DUTs that are

floating and not directly connected to an earth

ground. This is more accurate than when

GROUND MODE is set to ON as any stray

capacitance/resistance that leaks to the earth

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GW Instek GPT-9000 series User Manual

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