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Model 6517B Electrometer Reference Manual
:APERture <n>
This command is used to set the aperture for volts, amps, ohms, and coulombs.
Usage
:APERture <n>
:APERture?
:APERture?
:APERture?
:APERture?
<n>
Example
The integration period (measurement speed) for the Model 6517B can be set using either of two
commands: NPLCycle or :APERture. The NPLC method specifies the integration period as the
number of power line cycles per integration, while aperture specifies the time (in seconds) per
integration. The relationship between NPLC and aperture is expressed as follows:
Aperture = NPLC
Where:
Aperture is the integration rate in seconds per integration.
NPLC is the number of power line cycles per integration.
ƒ is the power line frequency.
For 400 Hz line power, use 50 Hz to calculate aperture.
When the integration period is set using the :APERture command, the value for the :NPLCycle
command changes accordingly to reflect the new integration period. Conversely, if the integration
period is set using the :NPLCycle command, the value for the :APERture command changes
accordingly.
On power-up, the instrument uses the NPLC value to determine the integration period. Thus, if using
a different power line frequency, NPLC remains the same, but aperture may change.
If line synchronization is enabled
not start until the beginning of the next power line cycle. For example, if a reading is triggered at the
positive peak of a power line cycle, the integration period does start until that power line cycle is
completed. The integration period starts when the positive-going sine wave crosses zero volts.
Also see
:NPLCycles <n>
6517B-901-01 Rev. C / August 2015
DEFault
MINimum
MAXimum
166.6666666667e-6 to 200e-3: Integration period in seconds
DEFault: Power line cycle integration: 16.67 ms for 60Hz power line; 20 ms
for 50 Hz and 400 Hz power line
MINimum: 166.6666666667e-6 s
MAXimum: 200 ms
ƒ
(:LSYNc:STATe <b>
(on page 14-61)
Section 14: SCPI command reference
(on page 14-124)), the integration period does
14-59
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