APPLICATION NOTES S-311-P-813
 
1) GSFC's S-311-P-813 specification was developed to enable procurement of Space Level precision resistors.  Special qualification and screening provisions have been included in this specification for space application considerations.  Included in this processing are a special power conditioning test and the option to require conformance to Current Noise, Voltage Coefficient and Thermal EMF test limits.
 
2) This part is similar in form, fit and function to the RNC90Y resistors from MIL-PRF-55182/9 and the MIL-R-122/1 resistors.  It is anticipated that the only qualified source for MIL-R-122/1 will drop their qualification in favor of providing parts to DSCC drawing versions of this device.  The DSCC drawings will not be Established Reliability specifications requiring routine failure rate maintenance testing.

3)  Parts procured in accordance with GSFC S-311-P-813 are acceptable for Level 1 or Level 2 applications.
 
4) Parts of any resistance value may be ordered within the ranges listed in the selection list tables.  However, it is preferred that resistance values be selected from the standard decade values shown in the listings herein.
 
5) These S-311-P-813 resistors should ONLY be used in applications where their particular characteristics of

are ABSOLUTELY necessary.  There are possible reliability concerns with these resistors resulting from the difficulty making robust connections to the thin nichrome foil used in their construction.
 
6)  S-311-P-813 does NOT include resistors above 100 kohms.  The thin foils required for values above 100 kohms and the complexity of the grid line pattern in the resistive foil make resistors with these high values difficult to produce with a reliability satisfactory for space flight applications.