Manual

Measurement Channels and Alarms
IM 04L21B01-01EN
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Index
3.13 Using the Log Scale to Perform Measurements (/LG1 Option)
Note
• Set the mantissa to 1.00.
• The output voltage for pressure reading whose mantissa is 1.00 has a certain deviation.
For example, if the pressure reading is 1.00E-5, the output voltage is 2.00 to 2.10 V. In this
situation, set the range to the minimum value (2.00 V).
• Setting the Nonlinear Log Input (LogType1)
To support the nonlinear output of vacuum gauges, use the calibration correction
function (/CC1) to correct the recorder input values with linear approximation.
Conceptual Diagram
The pressure scale is mapped to an input scale that has been multiplied by a constant
number to derive the output scale.
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Input value [V]
Pressure scale
Output scale
Output value [V]
1
Press MENU (to switch to setting mode), and select the Menu tab > Meas channel
> Range, Alarm.
Set the range as shown below. To use the calibration correction function (/CC1
option), be sure to set the mode to LogType1.
Mode: LogType1
Range: 20V
Span: Lower 0.000, Upper 10.000
Scale: Lower 1.00E-1, Upper 4.00E+3
For the span and scale, assign the boundary values of the output scale and pressure
scale in the conceptual diagram.