Leakage is a variable that stores the measured leakage current in nano amps (nA) on the charge
amplifier input during the CS110 electric field measurement. A perfect unit is 0 nA. Actual units
will have small (<< 1 nA) positive leakage current and some have small negative leakage current.
The Status variable stores the status code (Table 8-1 (p. 26)). The CS110() instruction initially
measures the electric field using the ±250 mV range. If the result is NAN (not a number), the
instruction measures the CS110 using the ±2500 mV range. A status code of 1 is returned if the
measurement was made on the 250 mV range. A status code of 2 is returned if the measurement
was made on the 2500 mV range. A status code of 3 is returned if the measurement overranged
on the 2500 mV range.
6.5.2 CS110Shutter instruction
The CS110Shutter() instruction controls the shutter and has the following structure:
CS110Shutter(Status,Move)
Status is a variable that stores the status code (Status codes (p. 26)). Move is set to 1 to open
the shutter and set to 0 to close the shutter.
For testing purposes, the CS110Shutter() instruction used with a Delay() instruction
verifies the fully opened and fully closed positioning of the CS110 shutter. Use the
CS110Shutter() instruction along with a VoltDiff() instruction to implement a slow
antenna electric field measurement (CS110 as a slow antenna (p. 61)).
6.5.3 Internal relative humidity sensor programming
The CS110 includes a relative humidity sensor is contained inside the case. The following CRBasic
instruction stores the internal humidity measurements in the variable Internal_RH:
VoltDiff(Internal_RH,1,mV2500,5,True,0,250,0.1,0)
Change the CS110 desiccant when the average internal relative humidity readings are greater
than 20%.
6.5.4 Sensor programming
Table 6-1 (p. 11) shows the compatible sensors. This section includes examples of CRBasic
instructions used to measure meteorological sensors follows. Refer to the sensor manuals and
Sensor connectors (p. 34) for additional programming information.
CS110 Electric Field Meter 10
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