Teledyne 100E - Modem or Terminal Operation; PMT Preamplifier Board; PMT Sensor

TROUBLESHOOTING & REPAIR Model 100E Instruction Manual
216 045150102 Rev XB1
• If a modem is used, additional configuration and wiring rules must be observed.
See Section 6.9.3.
• Incorrect setting of the DTE - DCE Switch is set correctly See Section 6.9.5.
11.5.10.2. Modem or Terminal Operation
These are the general steps for troubleshooting problems with a modem connected to a
T-API analyzer.
• Check cables for proper connection to the modem, terminal or computer.
• Check the correct position of the DTE/DCE as described in Section 6.9.5.
• Check the correct setup command (Section 6.11.3.)
• Verify that the Ready to Send (RTS) signal is at logic high. The M100E sets pin 7
(RTS) to greater than 3 volts to enable modem transmission.
• Make sure the baud rate, word length, and stop bit settings between modem and
analyzer match, see Section 6.9.
• Use the RS-232 test function to send “w” characters to the modem, terminal or
computer; See Section 6.9.8.
• Get your terminal, modem or computer to transmit data to the analyzer (holding
down the space bar is one way). The green LED on the rear panel should flicker as
the instrument is receiving data.
• Make sure that the communications software is functioning properly.
Further help with serial communications is available in a separate manual “RS-232
Manual”, T-API part number 013500000, available online at http://www.Teledyne-
api.com/manuals/.
11.5.11. PMT Sensor
The photo multiplier tube detects the light emitted by the UV excited fluorescence of SO
2
.
It has a gain of about 500000 to 1000000. It is not possible to test the detector outside
of the instrument in the field. The best way to determine if the PMT is working properly is
by using the optical test (OTEST), which is described in Section 6.7.5. The basic method
to diagnose a PMT fault is to eliminate the other components using ETEST, OTEST and
specific tests for other sub-assemblies.
11.5.12. PMT Preamplifier Board
To check the correct operation of the preamplifier board, we suggest the technician carry
out the electrical and optical tests described in 6.8.5. and 6.8.6. If the ETEST fails, the
preamplifier board may be faulty.