GRAPHTEC midi LOGGER HV User Manual page 108

CHAPTER 3 Settings and Measurement
Zero adjustment function
Zero adjustment is a function to force cancel the offset of measured value with offset.
Offset voltage
0V
For example, when the offset voltage is +1V, and if +1V is actually input, the device measures +1V as 0V.
Setting
(1) Perform Auto Zero
ADJ.
(2) Reset Auto Zero ADJ.
(3) Set Zero Point as
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
In the case of the above example, the effective value (RMS) can be obtained without specifying this cross
value.
3-64
0V
(1)
(2)
(3)
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).
The zero point voltage value (zero point RH value) is reset.
The zero point voltage value (zero point RH value) is displayed. When the voltage value (RH value)
displayed in this field is input, it is measured as 0 V (0%).
The area of this part is
the effective value (RMS) .
1 cycle
(1) (2)
Description