Secondary Measurements

Most measurement functions allow you to select and display a secondary measurement function. Secondary measurements can be displayed in the Number and Bar Meter displays only. For example, a thermistor temperature measurement (primary) and the resistance measurement made on the thermistor (secondary) are shown below:

To select a secondary measurement from the front panel, first select the primary measurement function and then press Display:

Press 2nd Meas and select the secondary measurement.

The primary measurement functions and their associated secondary measurements for each DMM model are:

Primary Measurement Function	34460A/61A Secondary Measurement Function	34465A/70A Secondary Measurement Function
DCV	ACV¹	ACV¹, Peak, Pre-Math
ACV	Frequency	DCV¹, Frequency, Pre-Math
2-Wire, 4-Wire Resistance		Pre-Math
DCI	ACI¹	ACI¹, Peak, Pre-Math
ACI	Frequency	DCI¹, Frequency, Pre-Math
Frequency	Period	Period, ACV, Pre-Math
Period	Frequency	Frequency, ACV, Pre-Math
Temperature	Sensor	Sensor, Pre-Math
Ratio	Input/Ref	Input/Ref, Pre-Math
Capacitance		Pre-Math
Cont		None
Diode		None

Where:

Pre-Math - The measurement value before any math operations are done (including NULL).
Sensor - The raw sensor value; ohms for thermistor/RTD, volts for thermocouple (thermocouple measurements apply to the 34465A and 34470A only).
Input/Ref - The DC signal voltage and the DC reference voltage measurements.
Peak - Displays a running history of the minimum peak, maximum peak, and peak-to-peak values of the input signal. Peak measurements are high-speed (16 µs effective aperture) and are different from the Min, Max, and Peak-to-Peak values gathered in Statistics.

¹ After making one or more primary measurements for approximately 4 seconds, the DMM makes one secondary measurement.

For the Peak secondary measurement, the Clear Peaks softkey allows you to clear the accumulated history of the peak-to-peak function (resets the record of peak values).