B+K precision 5490C Series, User Manual

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Secondary Measurement
Several measurement functions support secondary measurements. Secondary display measurements
are only available when using Number or Bar Meter display modes only.
Primary measurement function Available secondary measurement function(s)
DCV BeforeMath
DCI BeforeMath
ACV BeforeMath, Frequency
ACI BeforeMath, Frequency
2W, 4W Resistance Before math
Frequency BeforeMath, AC Voltage, Period
Temperature BeforeMath, Resistance
Capacitance BeforeMath
The BeforeMath secondary function displays raw measurement values when a Math function is
applied to the primary measurement.
Math Functions
Press then press to enter the math settings interface.
5.1 Null Operation
When using the Null function, the instrument takes the existing reading as a reference value, and the
subsequent readings subtract the reference value based on the actual input value.
Display reading = actual reading – reference value
Different measurement functions can set different reference values; once the reference value is set,
the reference values are the same for all ranges under the function.
Using the Null function does not increase the maximum allowed input signal for this range.
Set a user-defined null value using the softkeys and cursor navigation keys.
5.2 Statistics
Display the minimum (Min), maximum (Max), peak-to-peak (P-P), average (Average), standard
deviation (Std dev), and the total number of samples in the reading buffer.
The reading buffer can hold up to 10,000 data samples. When the reading buffer overflows, the oldest
data will be discarded. Press ‘Clear Readings’ using the softkey to reset the reading buffer.