Scientech S310 Vector Manuel d'utilisateur télécharger pdf (Page 30)

1. Calorimeter Watts Mode:

Compare voltage to the watt reading displayed on the

S310 to determine V/W constant to use when looking at

the analog output.

In power (watts) mode, the analog output is nominally 3 V full scale for each range. Therefore, to calculate watts

from the analog output voltage:

W = V/S

where:

V = analog output voltage (V)

S = analog output sensitivity (V/W) ≈ 3 V/range (W)

(for example, on the 10 mW range, S ≈ 3 V/.010 W = 300 V/W)

2. Calorimeter Joules Mode:

Compare the peak voltage to the energy (joules)

reading displayed on the S310 to determine

V/J constant to use when looking at the analog output.

In the energy (joules) mode the analog output is an amplified voltage signal proportional to the voltage generated

by the calorimeter thermopile. To calculate energy (joules) from the analog output use the following equation.

J = 0.3(Vpk)(TC)

(S)(R)

where:

Vpk = peak voltage from the analog output

TC = the calorimeter time constant from the calorimeter serial tag

S = the calorimeter output sensitivity as follows:

0.5 V/W for 25 mm models

0.1667 V/W for 50 mm models and large aperture calorimeters

R = indicator range multiplier as follows:

10.0 for the 10 or 30 range

100.0 for the 1 or 3 range

1,000.0 for the .1 or .3 range

10,000.0 for the .01 or .03 range

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Scientech S310 Vector Manuel d'utilisateur Page 30