Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario descargar pdf (Pagina 155)

100

101

Section 7. Installation

155

1. Send CRBasic example FieldCal Zeroing Demonstration Program (p. 155) to the

CR800. An excitation channel has been programmed to simulate a sensor

output.

2. To place the simulated RH sensor in a simulated-calibration condition (in the

field it would be placed in a desiccated chamber), place a jumper wire between

channels VX1/EX1 and SE6 (3L). Set variable mV to 1000. Set variable

KnownRH to 0.0.

3. To simulate a calibration, change the value in variable CalMode to 1 to start

calibration. When CalMode increments to 6, zero calibration is complete.

Calibrated Offset will equal -50% at this stage of this example.

Figure 48: Zero (Option 0)

4. To continue this example and simulate a zero-drift condition, change variable

mV to 1050.

5. To simulate conditions for a 30-day, service-calibration, again with desiccated

chamber conditions, set variable KnownRH to 0.0. Change the value in

variable CalMode to 1 to start calibration. When CalMode increments to 6,

simulated 30-day, service zero calibration is complete. Calibrated Offset will

equal -52.5%.

CRBasicExample26. FieldCal()ZeroingDemonstrationProgram

'Jumper VX1/EX1 to SE6(3L) to simulate a sensor

Public mV 'Excitation mV Output

Public KnownRH 'Known Relative Humidity

Public CalMode 'Calibration Trigger

Public Multiplier 'Multiplier (Starts at .05 mg / liter / mV,

'does not change)

Public Offset 'Offset (Starts at zero, not changed)

Public RH 'Measured Relative Humidity

'Data Storage Output of Calibration Data -- stored whenever a calibration occurs

DataTable(CalHist,NewFieldCal,200)

SampleFieldCal

EndTable

BeginProg

Multiplier = .05

Offset = 0

LoadFieldCal(true) 'Load the CAL File, if possible

1 2 ... 150 151 152 153 154 155 156 157 158 159 160 ... 565 566

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Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario Pagina 155

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