Keithley 6482, Справочное руководство

Страница: 96 / 350

6482-901-01 Rev. A / August 2012 Return to Section Topics 7-7
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 7: Sweep Operation
The source delay is part of the source-delay-measurement (SDM) cycle and is used to allow the
source to settle before the measurement is made. See
Section 9 , “Source-delay-measure cycle,”
for details.
The total time period of the source delay could include an autodelay and a user programmed
delay. With autodelay enabled, 1 ms of delay is used. The user-programmable source delay adds
0000.0000 to 9999.9980 seconds of delay. See
Section 3 , “Source delay,” to set these delays.
Additional delay for a sweep is available by using the trigger delay. This user-specified delay
(0000.0000 to 9999.9990 seconds) occurs before each SDM cycle (device action) of the sweep.
The trigger delay is executed before each new source-point in the sweep. See
Section 8 , “Front-
panel operation of the trigger model” and “Configuring triggering,” to set trigger delay.
Trigger count and sweep points
The trigger count and number of sweep points should be either the same or multiples of one
another. For example, with five sweep points and a trigger count of 10, the sweep will run twice.
See
Section 8 for details on trigger count.
Performing sweeps
Procedures for the various sweep types are covered below.
NOTE The following procedure assumes that the Model 6482 is already connected to the device
under test (DUT) as explained in
Section 2 .
Performing a linear staircase sweep
Step 1. Configure the channel.
Configure the Model 6482 for a specific channel as follows:
1. Select the source function by pressing the SRC1 or SRC2 key.
2. Set the appropriate source level value.
3. Press the MSR1 or MSR2 key to select the measurement channel, and then select the
measurement range.
See Section 3 , “Basic Operation,” for more information.
The source level you set becomes the bias level for the sweep. When turned on, the output will
maintain this bias level until the sweep is started. Typically, 0 V is used as the bias level.
If using a fixed measurement range, either make sure it can accommodate every measurement
point in the sweep or use autoranging.
Step 2. Configure the sweep.
Configure the sweep as follows:
1. Press the SRC1 or SRC2 key to select the channel, and then press the EXIT key to leave edit
mode.
2. Press the CONFIG key and then the SWEEP key.
3. Select TYPE , and then press the ENTER key.
4. Select STAIR , and then press the ENTER key.
5. At the prompts, enter the START, STOP, and STEP values.
6. From the CONFIGURE SWEEPS menu, select SWEEP-COUNT , and then press the ENTER
key.