Omega FOB100 - Manual (Page 14)

14
“f[j]” or “f[i j]” This command forces an actual temperature reading (j) for channel # i; any resulting offset
will be applied to all future measurements for that channel. This is useful to compensate for small
temperature deviations that may occur between sensors. A maximum offset of +/-5
o
C is recommended; if it is
required for you to force a larger offset, your thermometer probably requires a new factory calibration; consult
your distributor or factory for more information. This command alters the internal calibration of the instrument.
Always follow the recommended procedure, as given below.
Force temperature procedure:
I. Apply a stable and known temperature to the sensor tip
II. Check the display reading for abnormal deviation from the known temperature
III. Send the “f” command followed by channel number, a blank character and the reference
temperature value (example “f2 27.0
E
“). Temperatures must be entered in units as
specified by the “u” command
IV. Wait a few seconds
V. Confirm that the readings correspond to the known temperature.
Note: You can revert at any time to the factory calibration using the “f” (or “f[i]”) command (ex: “f2
E
”).
Note: Always make sure you are reading a valid temperature value before using the “f “ command; otherwise,
your thermometer may display a random value for a channel where the “f” command has been used.
“h” Displays a help menu screen (see above).
“i” Returns general information regarding the instrument, as well as some parameters that have been
programmed previously in the thermometer (either by RS-232 commands or via the keypad):
Ex: Model: FOB100
Option: NB Channel: 4
Mode: Continuous Scanning Mode
Scanning rate: Fast
Serial: FOB111A
Internal Software: V1.21
Last Factory Calibration*: 05/02/04 (YY/MM/DD)
Unit
o
C
Analog out, if error Toggle Max-Min 1Hz
Keyboard Status: Unlock
Channel Zero Span Enabled Temperature offset*
1 xxx.x xxx.x Yes/No ±xxxx.x
2** xxx.x xxx.x Yes/No ±xxxx.x
3** xxx.x xxx.x Yes/No ±xxxx.x
4** xxx.x xxx.x Yes/No ±xxxx.x
*: Temperature differential that is a consequence of the “f” command.
**: Only for multi-channel models.
“l[i]” This command is useful to prevent a local user from configuring the thermometer using the keypad. “i”
can take two values: “+” or “-“; entering “l+” will lock the keypad, while “l-“ will unlock it, thus enabling a user to
make local changes. If a user attempts to use a locked keypad, the message “LOC” is briefly displayed and
the command is rejected. A locked keypad can only be unlocked using the “l-“ RS-232 command.
“o[i]” This command can be used to change the behavior of the analog output(s) when the FOB100
thermometer cannot read a temperature for this channel. “i” can take one of three values:
a)
i=0. With this setting, the analog output will oscillate between its maximum and its minimum value at
a rate of approximately 1Hz.