Teledyne 6200E - Sulfides Analyzer - Manual (Page 258)

TROUBLESHOOTING & REPAIR Model 6200E Instruction Manual
258 M6200E Rev: A1
pin assignments in the implementation of RS-232. Problems with RS-232 connections usually
center around 4 general areas:
• Incorrect cabling and connectors. This is the most common problem. See Figure 6-8 for
connector and pin-out information and Section 6.10.3.
• The communications (baud) rate and protocol parameters are incorrectly configured. See
Section 6.10.6 on how to set the baud rate.
• The COM port communications mode is set incorrectly (Section 6.10.8).
• If a modem is used, additional configuration and wiring rules must be observed. See
Section 6.12.2.6.
• Incorrect setting of the DTE - DCE Switch is set correctly See Section 6.10.5.
11.5.10.2. Modem or Terminal Operation
These are the general steps for troubleshooting problems with a modem connected to a Teledyne
Analytical Instruments analyzer.
• Check cables for proper connection to the modem, terminal or computer.
• Check the correct position of the DTE/DCE as described in Section 6.10.5.
• Check the correct setup command (Section 6.12.2.6.)
• Verify that the Ready to Send (RTS) signal is at logic high. The M6200E 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 6.12.2.6. and Section 6.10.
• Use the RS-232 test function to send “w” characters to the modem, terminal or computer;
See Section 6.10.10.
• 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”,
Teledyne Analytical Instruments part number 013500000, available online at
http://www.Teledyne-ai.com/manuals/.
11.5.11. PMT Sensor
The photo multiplier tube detects the light emitted by the UV excited fluorescence of H
2
S. 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 6.9.5. The basic method to diagnose a PMT fault is to
eliminate the other components using ETEST, OTEST and specific tests for other sub-assemblies.