PN 10795T 34
CALIBRATION OF VECTOR™ CALORIMETERS
Calibration of 25mm & 50mm Vector Calorimeters Using Electric Substitution
Heating
For Vector calorimeters the electric substitution heating option must be ordered and installed at the factory
when the calorimeter is purchased. It can not be retrofitted to a calorimeter at a later time. To calibrate
using electric substitution heating proceed as follows.
Figure 4. Vector Calorimeter Circuit Board
A. Remove the screws holding the calorimeter's ID tag and remove the plate to expose the circuit
board as shown in Figure 4.
B. Connect the calorimeter to the power meter, turn on the power and let the system equilibrate.
C. Connect a DVM to the test points labeled SUB and HTR on the calorimeter circuit board.
D. Measure the resistance of the substitution heater making sure to subtract the resistance of the patch
cables from the total resistance measurement. 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.
E. Remove the DVM. Connect a power supply to the SUB and HTR test points and connect the
DVM to monitor the power supply.
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