Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
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Verify that cable (03596) that connects the serial COM ports of the CPU to
J12 of the motherboard is properly seated
Troubleshooting Calibrator/Modem or Terminal Operation 8.4.11.2.
These are the general steps for troubleshooting problems with a modem
connected to a Teledyne API calibrator.
Check cables for proper connection to the modem, terminal or computer.
Check to make sure the DTE-DCE is in the correct position as described in
Section 5.1.1.
Check to make sure the set up command is correct (See Section 5.2)
Verify that the Ready to Send (RTS) signal is at logic high. The T703 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 calibrator match, See Section 5.1.3.
Use the RS-232 test function to send “w” characters to the modem, terminal
or computer; See Section 5.1.5
Get your terminal, modem or computer to transmit data to the calibrator
(holding down the space bar is one way); the green LED should flicker as the
instrument is receiving data.
Make sure that the communications software or terminal emulation software
is functioning properly.
NOTE
Further help with serial communications is available in a separate manual “RS-232 Programming
Notes” Teledyne API part number 013500000.
TEMPERATURE PROBLEMS 8.4.12.
Individual control loops are used to maintain the set point of the UV lamp and
ozone generator. If any of these temperatures are out of range or are poorly
controlled, the T703 will perform poorly.
Box / Chassis Temperature 8.4.12.1.
The box temperature sensor is mounted to the motherboard and cannot be
disconnected to check its resistance. Rather check the BOX TEMP signal using
the SIGNAL I/O function under the DIAG Menu (see Section 8.1.3). This
parameter will vary with ambient temperature, but at ~30
o
C (6-7 above room
temperature) the signal should be ~1450 mV.
Photometer Sample Chamber Temperature 8.4.12.2.
The temperature of the gas in the photometer sample chamber should read
approximately 5.0C higher than the box temperature.
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