Omega FOB100 manual Force temperature procedure

“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 +/-5oC 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	oC
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.

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