NIL SI MODES

NIL SI mode

As of Februrary 2024, this is the new NIL SI mode, which uses a standard TE mode plus a window blocking all events to allow txings information to be telemetered in the exposure records.

NIL SI mode
SIMODE	# of CCDs	Parameter Block	Window Block
H2C_0002	2	WT00DAA014	W200138014

Historical NIL SI modes

(valid Nov 2022 - Feb 2024)
These are the new next-in-line modes for use during HRC observations. We are no longer switching between different modes for HRC-I and HRC-S, or for even/odd ObsIDs. All observations should use the 2-chip mode, unless thermal conditions require 1-chip.

NIL SI modes
SIMODE	# of CCDs	Parameter Block	Window Block
H2C_0001	2	WT00D96014	NONE
H1C_0001	1	WT00D98014	NONE

(valid pre November 2022)
How to decode the first three letters of the SIMODE

"H[IS][EO]]"

H - HRC

[IS] - I: HRC-I S:HRC-S

[EO] - E: OBSID is even O: OBSID is odd

5-chip NIL modes
SIMODE	SIM Position	Parameter Block	Window Block
HIE_0002	HRC-I	WT00452024	NONE
HIO_0002	HRC-I	WT00452024	NONE
HSE_0002	HRC-S	WT0023C024	W200039014 bottom 200 rows
HSO_0002	HRC-S	WT0023A024	W200038014 top 200 rows

4-chip NIL modes
SIMODE	SIM Position	Parameter Block	Window Block
HIE_0003	HRC-I	WT00D06014	NONE
HIO_0003	HRC-I	WT00D06014	NONE
HSE_0003	HRC-S	WT00D0A014	W200133014 bottom 200 rows
HSO_0003	HRC-S	WT00D08014	W200132014 top 200 rows

Last updated: 01/17/24