Teledyne 514 - NDIR analyzer - Manual (Page 52)

5–14
5.0 Maintenance & Troubleshooting
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
E-to-I Converters
Analysis unit E-to-I (see dwg. B-14075):
0-0.5 volts in
10-20 mA out
R1 = 50
Ω (TAI P/N R262)
Control unit E-to-I (see dwg. B-16631): This is an optional card
capable of providing the following outputs with 0-1 volt in and
the listed values for R1:
1. 1 to 4 mA, R1 = 250 Ω
2. 4 to 20 mA, R1 = 63.5 Ω
3. 10 to 50 mA, R1 = 25 Ω
Alarm Comparator (Optional)
See dwg. B-14618.
Extended Voltage Amp
R3 is installed for outputs greater than 1 VDC (see dwg. A-14620).
I-to-E Converter
See dwg. A-14620.
Single Range: Strap point A to point B (see dwg. B-14454). R11 is
not used for single range applications.
Dual Range: Strap C to I and D to T
Millivolt output (Optional):
R8 and R9
Filter Position Sensor Adjustment
The filter position sensor is mounted in the detector condulet assembly
(see dwg. C-14667). To adjust this sensor (power supplies installed):
1. Plug in the switch driver. Clamp the PCB into a card extender
and insert into the detection module.
2. Loosen the sensor bracket mounting screw.
3. Attach an oscilloscope to circuit board connector, pin 8 of the
switch driver PCB.
4. Adjust the sensor until the best sensor square wave is achieved.
Refer to Table IV at the end of this chapter.
5. A further check will be done later under Automatic Gain Control.
Switch Driver and Clamp Circuit (B-14561)
Refer to Table IV at the end of this chapter. For the remainder of the
adjustments in this section continue testing with the switch driver PCB
attached to a card extender as described above.