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Models 2500 and 2502 User’s Manual Basic Operation 3-11

Front panel measurement procedure

Step 1. Select measurement channel and range.

Select the desired measurement channel by pressing MSR1 (channel 1) or MSR2 (channel

2). With autoranging turned off, use the RANGE  and  keys to manually select the cur-

rent measurement range for that channel. You can also press AUTO to select autoranging.

Step 2. Select source channel and set source level.

The source level is the voltage setting of the selected source (channel 1 or channel 2).

NOTE The Model 2500 must be in the edit mode (EDIT annunciator ON) to set source

values. The edit mode is selected by pressing the SRC1 or SRC2 key. The ﬂash-

ing digit for the source value in the Src1 or Src2 display ﬁeld indicates that the

Model 2500 is in the edit mode for that channel. If no editing operation is per-

formed within six seconds, the edit mode times out and is cancelled.

The EDIT

, , , and  keys also enable the edit mode. They choose the last

edited source ﬁeld channel.

When editing the source value, the source is updated immediately, allowing you

to adjust the source value while the output is on.

The source value cannot be changed while the Model 2500 is performing a

sweep, which occurs with the Output ON and after the SWEEP key is pressed.

Perform the following steps to edit source values:

1. Press SRC1 or SRC2 to enter the edit mode for the desired channel. The ﬂashing digit

indicates which value (Src1 or Src2) is presently selected for editing.

2. Use the RANGE  and  keys to select either the 10V or 100V range that will accom-

modate the value you want to set. For best accuracy, use the lowest possible source

range.

3. Enter the desired source value. There are two methods to edit the value: value adjust

and numeric entry.

NOTE To clear the source value to 0V, press the 0000 (MENU) key while in the edit

source ﬁeld.

• Value adjust — To adjust the value, use the EDIT  and  keys to place the cursor

at the appropriate position, and use the EDIT  and  keys to increment or decre-

ment the value.

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Keithley 2500 User Manual

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