Geophone pre-amp and an adopter cable

Summary:

I soldered long pins to the geophone pre-amps to be used for the TAMA prototype test. I also made an adopter cable to convert the amphenol MIL-C-24682 10-6 connector to a D-SUB 9 so that we can connect the geophone output to the digital system.
I made three pre-amp circuits and one conversion cable. The next step is to connect the pre-amp to a geophone and connect it to the digital system through the converion cable to see if this chain of signal flow works or not.

Details:

Pre-amp circuit issue:

There are 6 pins sticking out on the pre-amp PCB. These were soldered during the in-air tests and the pins became unusable. These are ITT/Cannon 031-9074-002. I ordered 20 of them. When I got these, I found that the pins had a thick section at the end, which prevented them from inserted into the holes on the pre-amp PCB. After consulting with Okada-san of ATC, I decided to cut those unwanted section with lathe. It was a fun since it had been a long time since the last time I used lathe :-) After the machining, I soldered those pins into the pre-amp circuits.

Conversion cable:

The output from the air-tiight container (vacuum pod) of the geophone is Amphenol MIL-C-24682 10-6 (6-pin) (http://www.mouser.com/ds/2/18/26482_10-469475.pdf).
We need to make a conversion cable from Amphenol to D-SUB 9 as suggested by Mark's cabling document (http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3382).

Here is the construction of the cable I made today:

Amphenol   <- Flat twisted pair cable -> D-SUB

(A) +14V <- Brown -> D-SUB  pin 9
(B) SIG RET <- Red -> D-SUB pin 2
(C) POWER RTN <- Orange -> D-SUB pin 5
(D) +14 <- Yellow -> D-SUB  pin pin 4
(E) OUT P <- Green -> D-SUB pin 1
(F) OUT N <- Light Grey -> D-SUB pin 6

(E) and (F) are twisted.
 

Next step:

We should connect them all (including soldering of geohone output cables to the pre-amp PCB) and check if the signals are as expected.

Concerns:

Although I tried to keep the flange of the vacuum pod as clean as possible by putting on latex gloves, I think the flange and the cable, which are supposed to be put into vacuum, are not so clean. We need to clean them before installing. Also I wonder how the cables will be assembled for real KAGRA.

Resources  (compiled by Mark):

LDVT rack electronics, with a bit more on the Geophone (JGW-T1201255):
http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1255