3-4 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 3: Basic Operation Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Front-panel autozero
Set the autozero state from the front panel as follows:
1. Press the MENU key.
2. Select A/D-CTRL from the main menu, and then press the ENTER key.
3. Select AUTO-ZERO, and then press the ENTER key.
4. Select ENABLE or DISABLE as appropriate, and then press the ENTER key.
5. Press the EXIT key as necessary to return to normal display.
Remote command autozero
Use the :SYSTem:AZERo command to enable or disable autozero over a remote interface. For
example, send the following command to disable autozero:
:SYST:AZER ON
Conversely, send this command to disable autozero:
:SYST:AZER OFF
Source delay
The source delay options are used to set the settling time for the voltage bias source. This source
delay is the delay phase of the source-delay-measure (SDM) cycle. See Section 9, “Measurement
Concepts,” for more information.
Autodelay period
The autodelay period depends both on the current range (Table 3-3) and, during sweeps
(Section 7), on the voltage step size. With the source autodelay mode enabled, the total source
delay for both channels will be the sum of the current-range-based delay in Table 3-3 and the
voltage slew time for the channel that has the greater total delay. Worst-case voltage slew time,
T
VS
, is given by the equation:
For example, with the 2μA range and a voltage step size of 0.5 V, the total delay is:
Delay = 12.25 ms + (0.5 × 3.07 ms)
Delay = 13.785 ms
Table 3-3
Automatic source delay
I-range
I-range-based
autodelay
2 nA
20 nA
200 nA
2 μA
20 μA
200 μA
2 mA
20 mA
16 ms
16 ms
12.25 ms
12.25 ms
3.55 ms
3.55 ms
530 μs
530 μs
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