Teledyne 514 - NDIR analyzer - Manual (Page 51)

5–13
Maintenance & Troubleshooting 5.0
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
a. Insert an extender card in the switch driver and clamp
position. Remove keys as necessary.
b. Connect an oscilloscope to pin 6 (video from pre-amp), and
pin 3 (ground).
c. Remove the lens assembly from the light path.
d. Optimize lamp energy by adjusting the lamp position as
described in steps 1 and 2 above.
e. Replace the lens assembly.
f. Focus the lamp as described in step 3 to give the maximum
peak heights displayed on the oscilloscope.
g. If a Variac was used to alter the light intensity, disconnect it
and reconnect source to power supply.
Component Selection
Each 514 is made for a specific application. Therefore each will have
specifically selected electronic and optical components. These component
values are selected per application by the Photometric department.
Measuring and Reference Optical Filters
The Photometric department will supply the optical filters; mount each
filter in a filter holder (TAI P/N A1810) using 5-minute epoxy. Mount these
optical filter assembly in the filter chopper wheel. The measuring filter is
mounted on the edge of the chopper wheel with the white strip (see Fig. 5-1).
Proportional Temperature PCB
To fine tune temperature control, vary the resistance used by changing out
resistor R2 in the three boards below, which use the same schematic (see dwg.
B-15016).
Detector heater: R2
Space heater: R2
Sample heater: R2
Pre-Amp Gain
To select the gain, replace resistor R4 in schematic A-14619.
Log Card
One of three different types of log boards is selected, depending on the
application. Replace the indicated resistors on the boards noted to adjust the
logarithmic waveform.
Chopper-stabilized log PCB: R13 and R17 (See dwg. C-14586)
Log ratio PCB:
R8 and R16 (See dwg. C-14907)
Dual log PCB: R13 and R17 (See dwg. C-17706)