108
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
083730510A DCN8172
T
ROUBLESHOOTING
A
NALYZER
/M
ODEM OR
T
ERMINAL
O
PERATION
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne API's analyzer.
1. Check cables for proper connection to the modem, terminal or computer.
2. Check to ensure that the DTE-DCE is in the correct position as described in
Section 3.1.
3. Check to ensure that the set up command is correct.
4. Verify that the Ready to Send (RTS) signal is at logic high. The analyzer sets pin
7 (RTS) to greater than 3 volts to enable modem transmission.
5. Ensure that the BAUD rate, word length, and stop bit settings between modem
and analyzer match.
6. Use the RS-232 test function to send “w” characters to the modem, terminal or
computer.
7. Get your terminal, modem or computer to transmit data to the analyzer (holding
down the space bar is one way); the green LED should flicker as the instrument
is receiving data.
8. Ensure that the communications software or terminal emulation software is
functioning properly.
INTERNAL SPAN GAS GENERATOR AND VALVE OPTIONS
The zero/span valves and internal span gas generator options need to be enabled in the
software (contact the factory on how to do this).
The semi-permeable PTFE membrane of the permeation tube is severely affected by
humidity. Variations in humidity between day and night are usually enough to yield very
variable output results. If the instrument is installed in an air-conditioned shelter, the air is
usually dry enough to produce good results. If the instrument is installed in an environment
with variable or high humidity, variations in the permeation tube output will be significant.
In this case, a dryer for the supply air is recommended (dewpoint should be –20° C or less).
The permeation tube of the internal span gas generator option is heated with a proportional
heater circuit and the temperature is maintained at 50°C ±1
°
C. Check the IZS Temp in the
Dashboard or the IZS Temp Raw signal in the Utilities>Diagnostics>Analog Inputs menu.
At 50° C, the temperature signal from the IZS thermistor should be around 2500 mV.
BOX TEMPERATURE SENSOR
The box temperature sensor (thermistor) is mounted on the motherboard below the bottom
edge of the CPU board when looking at it from the front. It cannot be disconnected to check
its resistance.
•
Box temperature will vary with, but will usually read about 5° C higher than, ambient
(room) temperature because of the internal heating zones.
•
To check the box temperature functionality, we recommend checking the Box Temp
signal voltage in the Utilities>Diagnostics>Analog Inputs menu (Section 5.7.3).
•
At about 30° C, the signal should be around 1500 mV.
•
To check the accuracy of the sensor, use a calibrated external thermometer/
temperature sensor to verify the accuracy of the box temperature by:
Summary of Contents for T500U
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