23-1
IM WT1801-01EN
23 Other Features
You can set the following items.
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Enabling and Disabling the NULL Feature (NULL)
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Zero-Level Compensation (CAL)
Zero-level compensation is the process of creating a zero-input condition using the WT1800 internal circuit and
setting the level at that point to the zero level. It must be performed to meet the specifications of this instrument.
• Pressing CAL executes zero level compensation.
• The WT1800 automatically performs zero-level compensation after you change the measurement range or
input filter.
• To make accurate measurements, we recommend that you execute zero-level compensation after warming
up the instrument for at least 30 minutes. Also, the ambient temperature should be stable and within the
specified range (see chapter 6 in the getting started guide, IM WT1801-03EN).
• If the measurement range and input filter remain the same for a long period of time, the zero level may
change due to the changes in the environment surrounding the WT1800. If this happens, we recommend
that you execute zero-level compensation.
• There is a feature that automatically performs zero-level compensation during integration (integration auto
calibration).
NULL Feature (NULL SET)
You can use the NULL feature to subtract the DC offset while a measurement cable or external sensor is
connected.
Items to Configure NULL Settings for (Target Element)
All
Each time you press NULL, you can enable or disable the NULL feature for all the following input signals.
• U and I signals of each element
• Speed and Torque signals (on models with the motor evaluation option)
• Aux1 and Aux2 (on models with the auxiliary input option)
Select
Press NULL to select the input signals that you want to enable, hold, or disable the NULL feature for.
Voltage (U)
• All: You can enable or disable the NULL feature for the voltage signals of all elements at the same time.
• U1 to 6: You can enable or disable the NULL feature for the voltage signals of each element separately.
Current (I)
• All: You can enable or disable the NULL feature for the current signals of all elements at the same time.
• I1 to 6: You can enable or disable the NULL feature for the current signals of each element separately.
Motor (Motor)
• All: You can enable or disable the NULL feature for the Speed and Torque signals at the same time.
• Speed, Torque:
You can enable or disable the NULL feature for the Speed and Torque signals separately.
