Detcon 1640-N4X - Manual (Page 20)

1640-N4X
1640-N4X Instruction Manual Rev. 0.0 Page 16 of 28
The relays and alarm LED’s will remain disabled until the “ENTER” key is pressed again, “CALIBRATION
MODE” is exited, and the unit returns to normal operation.
NOTE: The 1640 does not poll devices while in Menu Mode, so there are no updates to displayed
readings or alarms.
Press the “PROG” key to exit the Main Manu, or use the “u” or “v” keys to move to the next or previous menu
item.
4.2.9 System Diagnostics
The unit will perform a series of tests to insure the integrity of the firmware and hardware. System diagnostics
should not be run in the field unless directed to do so by Detcon Factory Personnel.
4.3 Display Contrast
The Contrast Potentiometer located on the right hand side of the PCB adjusts the display contrast. The
Potentiometer is labeled “CONTRAST”.
4.4 Reset Switch
The “RESET” Switch located on the right side of the unit is used to reset alarms, and if the parameters are set
properly the switch will silence alarms.