16
DIAGNOSTICS
Self Diagnostics and Error Messages
Each time power is applied to the ratemeter, it performs a series of internal diagnos-
tic tests. A lamp test (all display segments ON) is conducted while these tests are in
progress. If a failure occurs, an error message will appear on the display.
The diagnostic tests are checksum calculations of internal ROM and NOVRAM
memory and a read/write test for internal RAM. Programming and calibration data is
stored in NOVRAM (non-volatile RAM). The checksum test verifies that data stored
in NOVRAM at power down is still there, uncorrupted, at power up. The first tests are
performed on ROM and RAM. Failure results in an error message
. This error is
non-recoverable, and the unit should be returned to the factory for repair. A failure in
the programming section of NOVRAM results in the displayed error message
.
This message remains on the display until power to the ratemeter is cycled OFF,
then ON, or until a key is pressed. This error is recoverable by re-programming the
unit. If subsequent
errors occur, the NOVRAM itself may have failed, and the
unit should be returned to the factory for repair. An error message
indicates
that the calibration section of NOVRAM has been corrupted.
THERE IS NO DIAG-
NOSTIC TEST TO DETERMINE THAT THE RATEMETER IS CALIBRATED!
Turn
power to the unit OFF, and then ON. If
appears on the display, return the unit to
the factory for repair. if the ratemeter powers up normally, the unit can be used only
after it has been calibrated.
Keyboard Diagnostic Mode
The keyboard diagnostics allows the user to test each of the front panel keys, the
display, and the analog retransmission and relay outputs if those optional boards are
installed.
Caution
: performing the diagnostic tests will turn ON the analog transmis-
sion and relay outputs if those options are installed. Remove power from the
ratemeter and disconnect the outputs before entering the keyboard diagnos-
tic mode. If the optional RS 485 communication board is installed, the ratemeter will
respond with the rate or process time to the QST command.
PROGRAMMING cont. / DIAGNOSTICS
Relay Hysteresis. Enter the difference in
rate or time units between relay turn ON
values (setpoints) and relay turn OFF values.
Range: 0 to 999
!
