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34410A/11A User’s Guide 61
Features and Functions 2
Null Measurements
The multimeter allows separate null settings to be saved for each of the
following measurement functions: DC Volts, AC Volts, DC Current, AC
Current, Resistance, Frequency/Period, Capacitance and Temperature.
When making null (also called relative ) measurements, each reading is the
difference between a stored (selected or measured) null value and the
input signal. One possible application is to increase accuracy of two–wire
resistance measurements by nulling the test lead resistance. Nulling the
leads is particularly important prior to making capacitance measurements.
The formula used for calculating null measurements is:
Result = reading – null value
• The null value is adjustable, and you can set it to any value between
0 and
\ 120% of the highest range, for the present function. Alternately,
you can measure the null value.
• Front Panel Operation: For any selected measurement function, to enable
null measurements press repeatedly until NULL is displayed, then
select ON with the navigation keypad, then press to display NULL
VALUE . Enter the desired null value with the navigation keypad, then
press . Then step through or exit the configuration menu. The Null
annunciator will turn on, indicating that the null function is enabled.
Alternately , you directly measure and store the null value by pressing
with the test leads open (nulls the test lead capacitance), shorted
(nulls the test lead resistance) or across a desired null value circuit.
• Remote Interface Operation: The following command enables the null
measurement feature for the specified <function>:
SENSe:<function>:NULL[:STATe] {ON
>
OFF}
The following command queries the null measurement feature setting:
SENSe:<function>:NULL[:STATe]?
This query returns a “0” (OFF) or “1” (ON).
The following command stores a null value for the specified <function>:
SENSe:<function>:NULL[:VALue] {<value>
>
MIN
>
MAX}
The following command queries the null value stored for the specified
function:
SENSe:<function>:NULL[:VALue]?
This query returns the stored null value.
Refer to the Agilent 34410A/34411A Programmer’s Reference for
complete description and syntax for these commands.