Scientech S310 Vector User Manual
Page 30
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