Campbell-scientific CS110 Electric Field Meter Manual do Utilizador descarregar pdf (Página 32)

CS110 Electric Field Meter

Scan(1,sec,0,0)

for k = 1 to 16 'Initialize status array.

E_status(k) = 0

PanelTemp (panel_temp,250)

Battery (battery_volt)

VoltDiff (internal_RH,1,mV2500,5,True ,0,250,0.1,0)

PulseCount (rain_fall,1,2,2,0,0.01,0) 'TE525 tipping bucket 0.01 inches per tip

PulseCount (wind_speed,1,1 ,1,1,0.2192,0) 'Mult for 05103 Wind Monitor.

BrHalf (wind_dir,1,mV2500,4,Vx2,1,2500,False,450,250,355,0) 'Mult. for 05103 Wind Monitor.

VoltDiff (solar_rad,1,mV7_5,3,True,450,250,200,0)

meas_error = 0 'Initialize disable variable for Efield average in slow table.

SW12 (1 ) 'Apply 12 V to warm-up Temp and RH probe at least 150 ms.

CS110(E_field,leakage_cur,status,_60Hz,Mcorrected,0)

VoltSe (RH,1,mV2500,1,1,0,250,0.1,0)

VoltSe (air_temp,1,mV2500,2,1,0,250,.18,-40)

SW12 (0) 'Turn off power to Temp and RH probe.

if RH > 100 and RH < 108 then

RH = 100

EndIf

If E_field = NAN Then 'Not-A-Number because of measurement problem.

meas_error = 1 'Disable output to slow table if efield = NAN.

EndIf

E_status(status) = 1 'Set appropriate element in status array.

If status > 6 Then

Error_Count = Error_Count + 1 'Increment Error_Count.

EndIf

CallTable Tabfast

CallTable Tabslow

NextScan

EndProg

This program incorporates two different user-defined data tables, Tabfast and

Tabslow. Tabfast contains 1 second measurements, while Tabslow contains 1

minute averaged data. Under certain error conditions the CS110 returns NAN

(Not-A-Number) for measured electric field rather than a questionable electric

field measurement. For example, the CS110 will detect if the shutter cannot be

properly closed at the completion of a measurement due to an obstruction. If

the shutter cannot properly close then the CS110 will return NAN for the

electric field measurement along with a status value indicating that the motor

could not properly close the shutter. The various CS110 status codes are

described in Appendix A.

The above program utilizes the array E_status(16) to store the various status

codes returned from a given measurement. The Totalize instruction in

Tabslow computes the total number of occurrences for each array value during

the output interval. Consequently, the array E_status returns the total number

of occurrences of each status code during the associated 1 minute output

interval. As given in Appendix A, status codes 1, 2, and 3 are associated with

good electric field measurements, whereas each of the higher codes indicates a

concerning condition such as low-battery voltage or too much leakage current

on the electrode insulators.

There are times when it is desirable to exclude a measured result from an

output processing instruction such as Average. This can be conveniently

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