Campbell-scientific CS110 Electric Field Meter Manual de usuario descargar pdf (Pagina 21)

CS110 Electric Field Meter

of variations in surface cleanliness along with charging and discharging

processes. Polished 316-L stainless-steel is used for critical electrode surfaces

on the CS110 to minimize unwanted surface charges. CS110s with clean

electrodes have been found to display electric field offsets <⏐30 V/m⏐, which

has negligible effect on the determination of M

parallel_plate

because of the ±15

kV/m range of electric fields used during factory calibration. Neglecting

parallel_plate

results in the simplified parallel-plate calibration equation

E = M

parallel_plate

⋅V (eq. 4).

The estimated measurement accuracy of M

parallel_plate

for the CS110 calibrated in

the parallel plate electric field calibrator illustrated in Figure 5 is ± 1 %. The

electric field offset of the CS110 can be measured by covering the stator with a

clean Zero Electric Field Cover (PN: 17642). If the resulting zero field reading

with the zero field cover exceeds an absolute value of 60 V/m then cleaning of

electrodes in the CS110 is suggested. The factory calibration data for a typical

CS110 factory calibration and resulting determination of M

parallel_plate

= 84.32

V/m⋅mV (Volts/meter⋅millivolt) is illustrated in Figure 6.

y = 84.324x + 26.258

= 1

-15000

-10000

-5000

5000

10000

15000

20000

-200 -150 -100 -50 0 50 100 150 200 250

Applied Electric Field (V/m)

-20000

Charge Amplifier Output Voltage (mV)

FIGURE 6. Factory calibration data for CS110 SN: 1026

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 87 88

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Campbell-scientific CS110 Electric Field Meter Manual de usuario Pagina 21