BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 51)

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4
Front Panel Operations
This chapter contains information about how to change the parameters
and settings for your measurements and all the details about each
feature and function.
4.1 Measurement Configuration
The following information will guide you through ways to configure
measurement functions. It provides you the flexibility to change any
parameter in any measurement function when needed, including ADC
setting, filter, resolution setting (digits), DC input resistance, threshold
resistance (continuity), range (manual & auto), rate (integration time),
sensor type for temperature measurements, remote interface selection
and input terminal switch.
4.1.1 Set ADC (Auto Zero & Auto Gain)
Zero and Gain
The purpose of Auto Zero and Auto Gain functions are used for
minimizing the offset influence on your measurements. When Auto Zero
or Auto Gain is enabled, 1201 takes the input signal reading as a base
value and then internally disconnects the input signal, and takes a offset
reading (a null offset). It then subtracts the offset from the base to get
an accurate measurement.
Displayed reading = Base value (input signal) – Offset value
When the Auto Zero or Auto Gain is enabled the meter takes an offset
reading for each subsequent measurement. However, when Auto Zero or
Auto Gain is disabled, the meter only takes one offset reading each time
when you change the function settings. User can set “PERIOD” to change
the time interval for taking an offset reading.