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Section 2: General operation Model 2657A High Power System SourceMeter® Instrument Reference Manual

2-68 2657A-901-01 Rev. B/December 2012

To configure the output-off mode from the front panel:

1. Press the CONFIG key.

2. Press the OUTPUT ON/OFF control. The CONFIGURE OUTPUT A menu is displayed.

3. In the CONFIGURE OUTPUT A menu, select OFF-STATE to display the OUTPUT OFF STATE

A menu.

4. With the OUTPUT OFF STATE A menu displayed, select MODE to open the OFF MODE A

menu.

5. Select the output-off mode: HI-Z (high-impedance), NORMAL, or ZERO.

To select the normal output-off mode over a remote interface:

smua.source.offmode = smua.OUTPUT_NORMAL

To select the high-impedance output-off mode over a remote interface:

smua.source.offmode = smua.OUTPUT_HIGH_Z

To select the zero output-off mode over a remote interface:

smua.source.offmode = smua.OUTPUT_ZERO

Output-off function

This setting is used only when the when output is turned off and the Model 2657A is in NORMAL

output-off mode (smua.source.offmode = smua.OUTPUT_NORMAL).

When the Model 2657A is in NORMAL output-off mode, you can set the output-off function to

CURRENT or VOLTAGE through the CONFIG menu on the front panel, or by using the

smua.source.offfunc attribute from a remote interface. VOLTAGE is the default output-off

function.

When the output is turned off and the selected output-off function is VOLTAGE

(smua.source.offfunc = smua.OUTPUT_DCVOLTS):

• The source-measure unit (SMU) sources 0 V.

• The current limit is set by the smua.source.offlimiti attribute (default 1 mA).

When the output is turned off and the selected output-off function is CURRENT

(smua.source.offfunc = smua.OUTPUT_DCAMPS):

• The SMU sources 0 A.

• The voltage limit is set by the smua.source.offlimitv attribute (default 40 V).

When the output-off function is set to either voltage or current, the SMU may source or sink a very

small amount of power. In most cases, this source or sink power level is not significant.

Selecting the output-off function

This setting is used only when the when output is turned off and the source-measure unit (SMU) is in

NORMAL output-off mode.

NOTE

Keithley 2657A User Manual

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