ECS Measurement SI Mode Trends

Statistics Run Date: 2018Mar26

Introduction
Since Start of Current Epoch
Important Notes

I. Intro

This web page will help you track ECS measurement performance with regard to
total time on each of the three SI modes as well as the amount of the total time that
was cold (i.e. temperatures <= -118.7 degress C).

The present targets for the Total and Cold times are:

Total time per SI Mode per measurement: 7600.0 seconds
Fraction of total time the measurement should be cold: 60.0%
Back To Top

II. Statistics Since the Start of the Current Epoch

Cold Time Statistics:

WARNING!!!! Cold Time Statistics SERIOUSLY Out Of Balance!

(See the Rule set at the bottom of the page)

Cold ECS Time:

ECS Trending Table: Cold Time
Stats	TE_007AC	TE_007AE	TE_00B26
Total Exp. Cold Time (secs)	62319	62319	62319
Total Actual Cold Time (secs)	0	28871	41780
Delta From Expected (secs)	-62319	-33447	-20538
% of Exp. Cold Total (secs)	0.00%	46.33%	67.04%

Total Time Statistics:

Total ECS Time:

ECS Trending Table: Total Time
Stats	TE_007AC	TE_007AE	TE_00B26
Total Expected Time (secs)	103866	103866	103866
Total Actual Time (secs)	47435	111705	110401
Delta From Expected (secs)	-56431	7839	6535
% of Expected Total (secs)	45.67%	107.55%	106.29%

ECS Trending Table: SI Mode Stats
SI Mode	Total Number of Obs.	Total Exposure Time (sec)	Average Exposure (sec/obs)
Primary 6 Chip SI Modes
TE_007AC	7	42718.00	6102.57
TE_007AE	12	77723.00	6476.92
TE_00B26	16	100685.00	6292.81
Old 6 Chip SI Modes
TE_00216	0	0.00	0.00
TE_0021C	0	0.00	0.00
TE_008EA	0	0.00	0.00
5 Chip SI Modes
TE_00C60	2	14434.00	7217.00
TE_00CA8	4	33982.00	8495.50
4 Chip SI Modes
TE_00C62	0	0.00	0.00

Totals:	41	269542.00	6574.20

Important Notes:

The Rules:

The rules to be followed, in descending order of importance, are:

Rule #1: The key time period for balancing SI mode statistics is the 3 month Epoch
By the end of the epoch, the SI mode statistics should match the rules stated below.

Rule #2: Make certain to spread the amount of *COLD* ECS time as evenly as possible across all three SI modes.

Rule #3: Spread the amount of *Total* ECS time as evenly as possible across all three SI modes.
Rule #2 takes precedence over Rule #3.

Rule #4: At least 60% of scheduled ECS measurement time must be -118.7degC Balance Total and Cold measurement
data between the three default 6-chip modes on an Epoch basis within 10%

A word about the Total Time stats:

    - The Total Expected Time values for each SI mode in the table is calculated by:

        # of ECS runs executed in this epoch so far * 10,000.0 * 0.76 / 3.0

    Where:

         10,000.0 seconds is the maximum possible time for ECS runs

         We exepct only 7600.0 seconds on average - hence multiply by 0.76

         We divide by three because we want the time evenly distributed across all three aggregate SI modes

A word about the COLD Time stats:

Cold Time is defiined by focal plane temperatures <= -118.7 degrees C:

The Total Expected Cold Time value is 60.0% of the Total Expected Time (see above).

SI Mode Mapping between 6,5 and 4 chip modes:

    The 6 chip SI Modes consist of three distinct modes. But there are only 2, 5 chip SI Modes and only one 4 chip SI mode. To make tracking feasible, the 4 and 5 chip modes were mapped into the 6 chip modes in the following manner:

       6 chip               5 chip         4 chip

    TE_007AC -> TE_00C60 TE_00C62

    TE_00B26 -> TE_00C60 TE_00C62

    TE_007AE -> TE_00CA8

All of the TE_00CA8s get counted as TE_007AE

Half of the TE_00C60s get counted towards TE_007AC and the other half get counted with the TE_00B26s

Half of the TE_00C62s get counted towards TE_007AC and the other half get counted with the TE_00B26s.

So watchout for TE_00B26 over-representation.

Back To Top