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

2657A-901-01 Rev. B/December 2012 2-29

COUNT: Sets the trigger count (number of measurements) as follows:

• FINITE: The instrument goes through measurement cycles for the programmed trigger count (1 to

99999).

• INFINITE: The instrument goes through measurement cycles indefinitely until halted.

INTERVAL: Sets the time interval between measurements (0 s to 999.999 s) when the count is

greater than 1.

DELAY: Sets the delay period between the trigger and the start of measurement (0 s to 999.999 s).

Front-panel triggering example

This example configures the trigger parameters to meet the following requirements:

• Manual triggering (TRIG key)

• Infinite trigger count (cycle indefinitely through measurement cycles)

• Interval (time between measurements): 1 s

• Delay (time from trigger to measurement): 2 s

To configure the trigger parameters:

1. Press the CONFIG key, and then the TRIG key.

2. Select TRIGGER-IN, and then press the ENTER key or the navigation wheel .

3. Select MANUAL, and then press the ENTER key or the navigation wheel .

4. Select COUNT, then select INFINITE, and then press the ENTER key or the navigation wheel .

5. Select INTERVAL, set the interval to 1 s, and then press the ENTER key or the navigation wheel

6. Choose DELAY, set the delay to 2 s, and then press the ENTER key.

7. Press EXIT (LOCAL) to return to the main display.

8. Press the OUTPUT ON/OFF control to turn the output on.

9. Press TRIG. A 2 s delay occurs before the first measurement. The instrument cycles through

measurements indefinitely with a 1 s interval between measurements.

10. Press the OUTPUT ON/OFF control again to stop taking readings.

Configuring for measure-only tests using the MODE key

In addition to being used for conventional source-measure operations, the Model 2657A can also be

used like a meter to measure current, voltage, resistance, or power.

To configure the Model 2657A as a V-meter, I-meter, ohm-meter, or watt-meter:

1. Press the MODE key.

2. Turn the navigation wheel to select the type of meter from the menu (I-METER, V-METER,

OHM-METER, or WATT-METER).

3. Press the ENTER key to complete the configuration of the Model 2657A as the selected meter.

Keithley 2657A User Manual

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