ScienTECH Vector Series - DETECTOR OPERATION WITHOUT A POWER METER

PN 10795T 37
Note: When measuring the substitution heater resistance of a 200 mm calorimeter, R1 and R2 must
be connected together in series.
Compare this resistance to R
c
in the calibration data in the front of the manual. The two should
agree within 2%. If not, contact Scientech.
C. Calculate the voltage equivalent to laser power using the following formula:
V = (R
c
x C x W)
1/2
where:
V = voltage applied to the heater coil
R
c
= substitution heater resistance from step B
C = Cal coefficient 360401 = 1.018 360801 = 1.000
380401 = 0.974 380801 = 1.008
380402 = 1.024 380802 = 1.008
384UV5 = 1.021 388UV5 = 1.002
W = desired laser power in watts
D. Connect the DVM to the calorimeter’s DIN connector.
E. Apply the calculated voltage (V) to the electrical substitution heater.
F. Record the voltage reading of the DVM (V
c
).
G. Calculate the calorimeter’s output sensitivity (S) as follows:
S = V
c
/W
where:
S = calorimeter’s output sensitivity
V
c
= voltage output from the calorimeter in mV
W = desired laser power output.