--- In TekScopes@..., David DiGiacomo wrote:
On Sun, Jan 20, 2013 at 11:00 AM, Steve wrote:
TekScopes@..., David DiGiacomo wrote:
The 475M service manual is Army TM 11-6625-2735-14-1.
You can download it here:
David,
I respectrully dissagree.
This model is the contract version of the standard 475, with option 4 or option 4&7. It shows the scope operating with the 1106 power supply in an opt 7 configuration, and the front cover is the standard plastic one shipped with all 475s. The military recently retired this scope, and there are many of them showing up on e-pay now. They can be identified by the aluminum plate on the rear which identifies the contract.
The 475M is actually marked "475M" on the face plate. The cover is as I mentioned hard deep drawn aluminum, with rubber gasket and retaining hasps to keep it in place. I don't think it was ever offered in option 7, (mine is not, and the two others I have seen are standard.)
Well, that's confusing. There are several sources that list the
military OS-261B(V)1/U as a 475M, and then several others that list it
as 474/04. (The OS-261C(V)1/U is the 475/04/07.) Do you think
there's any electrical difference between the 475M and the 475/04?
I can't say for sure if circuits are different. It has the same appearance as a stock 475, other than the case. The V/div and time/div ranges are the same. But so are those onthe 465 and 465M which share virtually no circuits. In the case of the 475M, it is possible that it is basically the same circuits, with some redesign if portions did not meet the extended environmental requirements.
I don't have the time now to pull the case and do a thourough side by side examination with a stock 475, and I don't have a manual that covers this specific model.
- Steve
