[Milsurplus] H## options for HP equipment

[Sheldon Daitch]

In the FOR WHAT IT IS WORTH department,
I found a TM for the HP 5425L package
(TM 11-6625-1682-15/1) with the H96
optional specification, which is detailed as
 differences from the standard 5245L in that:

1. The 50 to 60 hz fan assembly used for B1 is replaced
   by a fan assembly which permits the instrument to be used 
   on 50 to 400 hz power lines.

   Themotor in  the above fan assembly requires a capacitor
   in series with one of the three leads to the fan motor.
   The capacitor is assigned a reference designator of
   C25.  The fan motor and capacitor are connected as 
   shown in an attached diagram.

2. A thermal cutout switch (S5) is installed in the
   AC line between fuse F1 and the junction of power
   switch S3B and oven transformer T1 pin 1.  Switch
   S5 opens the AC line to the entire instrument (oven
   included) when the internal cabinet temperature reaches
   approximately 65 degrees C (149 degrees F) and restores
   power when the temperature drops to approximately 55 
   degrees C (130 degrees F).

3. Decimal counter assemblies which provide a 1248 "1" state
   negative BCD output code are installed for A10 through A16.
   The readout assembly installed for A18 also provides a
   1248 "1" state negative BCD output.  Schematic diagrams
   and parts tables for these assemblies appear in the
   Service manual under Option 03 in Section V.

4. An HP part number 05245-91051 Decimal light assembly is 
   installed for A8.  This assembly is electrically equivalent 
   to the assembly normally used for A8 except the diode matrix 
   provides a 1248 "1" state negative BCD output.  The BCD
   output obtained from this assembly for each decimal light
   is given in a table.

5. An HP part number 05245-91052 Measurement Units Assembly
   is installed for A9.  This assembly is electrically equivalent 
   to the assembly normally used for A9 except the diode matrix 
   provides a 1248 "1" state negative BCD output.  The BCD
   output obtained from this assembly for each decimal light
   is given in a table. 

6. Schematic diagrams for the boards in 4 and 5 above are
   in the manual.

7. The instrument is supplied with a three conductor female (NEMA)
   to two prong, parallel blade power cord adapter with ground 
   lead (HP part number 1251-0048).


I think also that H## options spell H$$.

73
Sheldon
WA4MZZ/SV7