GRAPHTEC GL980 - Zero Adjustment Function; Effective Value (RMS) and Operation Cross Value

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CHAPTER 3 Settings and Measurement
Zero adjustment function
Zero adjustment is a function to force cancel the offset of measured value with offset.
0V 0V
Offset voltage
For example, when the offset voltage is +1V, and if +1V is actually input, the device measures +1V as 0V.
(1)
(2)
(3)
Setting Description
(1) Perform Auto Zero
ADJ.
The current input voltage (RH) is set to the zero point voltage value (zero point RH value) as a offset
voltage value (offset RH value).
(2) Reset Auto Zero ADJ. The zero point voltage value (zero point RH value) is reset.
(3) Set Zero Point as The zero point voltage value (zero point RH value) is displayed. When the voltage value (RH value)
displayed in this eld is input, it is measured as 0 V (0%).
Effective value (RMS) and operation cross value
The effective value (RMS) is obtained by operating the measured value.
To calculate the effective value (RMS), it is necessary to calculate one cycle of the input signal.
The voltage value used for detecting one cycle of the input signal is called the cross voltage.
0V
(1) (2)
1 cycle
The area of this part is
the effective value (RMS).
In the case of the above example, the effective value (RMS) can be obtained without specifying this cross
value.