User`s guide
Agilent 4155C/4156C User’s Guide Vol.2, Edition 6 7-37
Measurement Units and Functions
Measurement Time
Overhead Time
The overhead time is the time required for range changing and so on. This time
depends on the measurement condition, and cannot be specified. Major elements of
the overhead time are:
• Range changing time during measurement (when measurement ranging mode is
set to auto or limited auto)
• Range changing time at measurement start (when the measurement range is less
than the compliance value)
To Specify Source Output Time
As shown in the discussion of the overhead time, you cannot specify the
measurement time. However, in sweep measurement mode, you can specify a
source output time that includes the measurement time. To keep source output time
constant, the following conditions must be satisfied.
• Delay Time ≥ Wait Time
• Step Delay Time ≥ Measurement time
where, the wait time is the time after the source channel starts output until the
measurement channel starts measurement. The wait time is set on the MEASURE:
MEASURE SETUP screen.
To find the measurement time, execute the sampling measurement in the same
measurement conditions except for the source output value. You can find the rough
measurement time from the @TIME value of the sampling measurement result.
The delay time and hold time are set on the MEASURE: SWEEP SETUP screen,
and the step delay time is set on the MEASURE: OUTPUT SEQUENCE screen.
The step delay time is available only for sweep measurement mode. For the
parameters, refer to Setup Screen Reference.
Vstart
Hold Time
Measurement time
Delay Time (Td)
Step Delay Time (Tsd)
Td Tsd
Td Tsd
Source output time
Wait Time