Figure 2-15.
Model B7842 Thermal Converter
2. The schematic of the Model B7842 is shown in Figure 2-16. AC current into the
90-ohm UHF element heats the filament, heating the thermoelement junction which in
turn generates a voltage proportional to the temperature of the filament. Thus the
output voltage is proportional to the input power. Resistor R2 is used to obtain 5
mA current in the filament with the rated full input. Resistor R1 is used to trim
Operation of the Model B7842 is identical in
procedure to that of the Model 1395 and will not be discussed.
Figure 2-16.
Model B7842 schematic
36