Keysight Technologies 34410A - Null Measurements

60 34410A/11A/L4411A User’s Guide
2 Features and Functions
For frequency measurements only, the 34410A/11A/L4411A is capable of displaying a
full seven digits (for example, “999.980,3 HZ”).
Null Measurements
The 34410A/11A/L4411A allows separate null settings to be saved for each of the
following measurement functions: dc voltage, ac voltage, 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. Note that the null value is
entered in fundamental units (for example, Vdc).
• Front Panel Operation: For any measurement function, you can 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.
Alternately, you can enable null from the menu. Press as required:
...
> NULL > ON > NULL VALUE
Enter the desired null value with the navigation keypad, and then step through or exit
the menu. The Null annunciator is lit and the null function is enabled.
To turn the null function off: Press again, or use the menu.
• Remote Interface Operation: The following command enables the null
measurement feature for the specified function:
SENSe:<
function >:NULL[:STATe] {ON>OFF}
where < function > is any function except CONTinuity or DIODe.