Set Autozero To Once Or Off; Turn Autorange Off; Decrease Aperture Time Or Nplcs - Agilent Technologies Agilent E1412A User Manual

Turn Autorange
Decrease Aperture
Time or NPLCs
Setting the Resolution
Appendix C
CAL:ZERO:AUTO ON
CAL:ZERO:AUTO OFF
CAL:ZERO:AUTO ONCE
The zero may vary over time, especially as the room temperature varies.
Noticeable changes can be expected over many minutes or hours. However,
over a few seconds the changes should be very small.
Turning autorange
range which results in fast and predictable measurement times.
OFF
Autorange is turned
the <range> parameter of the
[SENSe:]RESistance:RANGe
[SENSe:]VOLTage:AC:RANGe
by the
[SENSe:]VOLTage:RANGe:AUTO ON|OFF
[SENSe:]VOLTage:AC:RANGe:AUTO ON|OFF
[SENSe:]RESistance:RANGe:AUTO ON|OFF
You can query the E1412A autorange status for a particular function by the
following commands:
[SENSe:]CURRent[:DC]:RANGe:AUTO?
[SENSe:]CURRent:AC:RANGe:AUTO?
[SENSe:]FREQuency:VOLTage:RANGe:AUTO?
[SENSe:]FRESistance:RANGe:AUTO?
[SENSe:]PERiod:VOLTage:RANGe:AUTO?
[SENSe:]RESistance:RANGe:AUTO?
[SENSe:]VOLTage[:DC]:RANGe:AUTO?
[SENSe:]VOLTage:AC:RANGe:AUTO?
[SENSe:]RESistance:RANGe:AUTO?
The aperture time or NPLCs (number of power line cycles) is the amount of
time that the input signal is integrated. The smaller the aperture time or
NPLCs, the faster the readings are taken.
A disadvantage to faster aperture times or smaller NPLC settings is
increased noise will be present in the measured values. The most common
source of noise is from AC power sources.
The magnitude of noise from AC power sources in most cases is many
millivolts. If the signal being measured is large enough, then the noise may
not be significant. However, noise becomes a factor if the signal being
measured is in the microvolt range.
The aperture time or NPLC is set as a result of specifying the <resolution>
parameter in the
with the [SENSe:]FREQuency:APERture
command or
[SENSe:]
----The zero will be measured before each
measurement.
----No new zero readings will be made.
----Does one Autozero operation when the
command is received and also sets the mode
to autozero OFF.
makes the E1412A take all measurements on a fixed
OFF
when a numeric value or
OFF
CONFigure
, [SENSe:]VOLTage:RANGe
command. Autorange is directly controlled
MEASure or CONFigure
function commands.
:NPLC
Measurement Speed and Accuracy Trade-offs
| is specified for
MIN MAX
, ,
MEASure
, or
,
, or
command.
command, or by directly setting it
or [SENSe:]PERiod:APERture
197