NOAA 12 SEM Subsystem Summary

Component	Description	Status
DPU	Space environment Monitor - Data Processing Unit	Green
MEPED	Space environment Monitor - Medium Energy Proton Detector	Green
MUX		Green
TED	Space environment Monitor - Total Energy Detector	Green

Subsystem History:

Date	Time	Component	Description
06/08/2006	18:18:00	TED	SEM TED autonomously shut off its high voltage (a known and occasional event on pre-KLM spacecraft). Configured back to normal on 9 Jun at 01:00z via CROH COP (no SCR).
09/27/2005	22:40:00		SEM Electron bias to level 3
09/26/2005	21:25:00	TED	Sets electron bias voltage to level 5
09/24/2005	15:54:00	TED	Change electron bias to level 5. ENd TED recovery operation. Payload back to normal operations.
09/24/2005	15:53:00	TED	Set MUX to normal mode
09/24/2005	15:52:00	TED	Set Pulse Height Discriminators to level 1
09/24/2005	15:51:00	TED	Set SEM TED biases to known levels
09/24/2005	15:50:00	TED	Turns on SEM High Voltages
09/24/2005	07:43:00	TED	SEM TED autonomously shut off its high voltage. This is a known problem with pre-KLM SEMs that requires the TED be reinitialized.
08/30/2004	11:06:00		Turn on SEM primarily for power balance purposes.
07/29/2004	17:05:00		SEM power up operation canceled. Subsystem is operationally capable but will remain powered off indefinitely.
07/25/2004	23:20:00		Battery undervoltage safestate tripped causing power load shed that included SEM power off.
10/11/2003	16:47:00	TED	Set TED to Electron level 3.
10/11/2003	16:46:00	TED	Set TED to normal data multiplex
10/11/2003	16:45:00	TED	SET SEM PHD to Level 1
10/11/2003	16:44:00	TED	Set TED to level 1
10/11/2003	16:43:00	TED	Turn on TED High Voltage
10/10/2003	05:00:00	TED	SEM TED experienced an autonomous instrument reset.
03/15/2003	16:00:00	TED	SEM limit flags indicating autonomous instrument reset.
03/15/2003	10:20:00	TED	Set PHD level 1
03/15/2003	10:20:00	TED	SEM reconfigured to nominal
05/14/1991	15:26:00	TED	On Orbit
05/14/1991	15:26:00	MEPED	On Orbit
05/14/1991	15:26:00	DPU	On Orbit