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76 Multimeter Command Reference Chapter 3
:FUNCtion
CALCulate:FUNCtion AVERage|DB|DBM|LIMit|NULL selects the math function
to be used. One function is enabled at a time with
NULL the default. The selected
function MUST be enabled with
CALC:STATe ON.
Parameter
Summary
• AVERage measurements store the minimum and maximum readings from a
number of measurements. The multimeter records the number of readings
taken since the average function was enabled then calculates the average of all
the readings. You read these values with
CALC:AVER:MIN?; MAX?;
AVERage? and COUNt?.
• DB measurements are the difference between the input signal and a stored
relative value, with both values converted to dBm.
• DBM operations calculate the power delivered to a resistance referenced to
1 milliwatt.
• The LIMit parameter enables pass/fail testing on the upper and lower limits you
specify using the
LIMit:UPPer and LIMit:LOWer commands.
• NULL measurements (also called relative measurements) provide a reading
which is the difference between a stored null value and the input signal.
• See the section titled “Math Operations” beginning on page 41, for more detail
on the
CALCulate operations.
Example Set the Calculate Math Function to Make Upper and Lower Limit Tests on
Each Measurement
CALC:FUNC LIM
Set calculate function to limit.
CALC:LIM:LOWer
Set the lower limit to test against.
CALC:LIM:UPPer
Set the upper limit to test against.
CALC:STATe ON
Enable the limit math operation.
:FUNCtion?
CALCulate:FUNCtion? queries the multimeter to determine the present math
function. Returns
AVER, DB, DBM, LIM, or NULL.
Example Query the Calculate Math Function
CALC:FUNC?
Query the calculate function.