GRAPHTEC GL2000 User Manual page 106

Cross value
0V
In the above example, the effective value (RMS) can be obtained by specifying this cross value.
To obtain the cross value, specify the voltage crossing the waveform.
If the waveform fluctuates up and down, check the waveform and set the cross value.
The operation method (of this device) is shown below.
V
0
GND (0V)
Effective value (RMS)
By specifying the cross voltage value, you can calculate the effective value (RMS).
Setting
(1) RMS value operation
cross value
(2) Get current measured
voltage value
(3) Cross value reset
When reading from the current measured voltage value, calculate after the actual input is entered.
Burnout check
Burnout refers to a state where the thermocouple is disconnected.
Check burnout of CH that is set to temperature.
Since the device cannot detect burnout and measure at the same time, check whether or not burnout has
occurred when measurement is not performed.
Please be aware that the measured value is not accurate when burnout takes place.
The area of this part is
the effective value (RMS) .
1 cycle
(1) (2)
1 cycle: T=n × dt
n: Number of data per cycle
Measured waveform
V
i
dt (Capturing interval of internal processing data)
n-1
1
∑
2
= V • dt
n×dt
i
i=0
(1)
(2)
(3)
Set the voltage which is the ± cross value for performing the RMS operation.
The RMS operation cross value of (1) is calculateed automatically from the current input waveform.
Reset the RMS operation cross value. (Set to 0V.)
Cross value
V
n-1
n-1
1
∑
2
= V
n
i
i=0
Description
CHAPTER 3 Settings and Measurement
3-65