Teledyne HPM-2002-OBE Restore Calibration, Restore Factory Defaults, Software Reset

Restore Calibration

r_CL

Restore Calibration transfers the calibration from the HPM-2002s tube EEPROM into the HPM-2002- OBE’s CPU.

EEI<CR>

Restore Factory Defaults

r_Fd

The Restore Factory Default command is used to place calibration parameters into the CPU. From this point the gauge can be calibrated. After calibration, the calibration parameters are stored in the HPM-2002s tube’s EEPROM.

/#<CR>

Software Reset

rrrr

This command performs a complete reboot of the HPM-2002-OBE. The CPU is reset and the tube’s calibration parameters are loaded.

/r<CR>

5.2. Frequently Asked Questions

Why does my display read, “Err1”?

This message indicates that an error has occurred during transfer of data between the HPM-2002-OBE’s CPU and the sensor tube’s EEPROM where the calibration coefficients are stored. If this error occurs during initial startup, then the factory default calibration coefficients will be automatically loaded. The factory defaults are often not accurate (typically ±50% or greater), however they allow the user to calibrate the gauge. If the sensor tube’s EEPROM cannot communicate with the CPU, then any new calibration will be lost when the gauge power is disconnected.

Sensor tube EEPROM performance can be verified by use of the RESTORE FACTORY DEFAULTS and the RESTORE CALIBRATION commands in the following manner. After calibration, use the RESTORE FACTORY DEFAULTS command. The pressure reading will shift dramatically. Immediately use the RESTORE CALIBRATION command. The pressure reading will return to the calibration value if the tube EEPROM communication is working properly. See the advanced setup guide (Section 5.1) for more information.

Why does my display read, “Err2”?

This message indicates that an error has occurred in the CPU’s EEPROM where the set points, gas number, and communication port settings are stored. If this error occurs during initial startup, then the factory default values for these settings will be in effect. CPU EEPROM performance can be verified by use of the RESTORE EEPROM command. See the advanced setup guide (Section 5.1) for more information. Caution: Use of the SAVE EEPROM command at this time will overwrite all previously stored values with default values.

Note: An “Err2” message is a exceedingly rare occurrence. If this error occurs then the CPU’s EEPROM is most likely defective.

Why does my display read, “Err4”?

This message indicates that a communications error has occurred between the HPM-2002-OBE and a data acquisition computer. This error is associated with the serial interface (RS232/485) and can indicate a baud rate or parity mismatch, a framing error or an overrun condition. The error can also occur if the data acquisition computer is powered down while the HPM-2002-OBE is still connected.

Modifying as necessary the baud rate, parity, word length and/or the stop bits on either the data acquisition computer or the HPM-2002-OBE, usually eliminates this error. Many operating systems are shipped with a

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