This is and old ~1987 Rubidium Standard which has a calibrate module "MDC". In
the past I have attempted to calibrate but has always failed with the error led
turned on. I have used various GPSDOs as primary standards with these attempts.
I was able to calibrate with a FTS-5030 Cesium standard l
- Forwarded Message
From: Stanley Reynolds
To: time nuts
Cc: stanley_reyno...@yahoo.com
Sent: Friday, February 6, 2009 12:09:34 PM
Subject: Efratom Modular System 8008-400-8
This is and old ~1987 Rubidium Standard which has a calibrate module "MDC". In
the past I have attempted to
The firmware on the old and new units reports the same revision levels and
dates. I am fairly certain that whatever is going on is in the DS1620 chip.
Also, if they were going to remove the high res temp code they probably would
not have left in the "subtract 0.25C" step and the software fil
Some more (possibly irrelevant) information in the DS1620 temperature sensor:
The units that I have checked that give the good temperature curve all have rev
D1 DS1620 chips. The ones with the flat line temperatures all have Rev E2
DS1620 chips. The chip rev is the last two characters of the
I got some info back from Maxim on the DS1620. The rev D chips use the dual
oscillator design described in the data sheet. The rev E chips are based on a
temperature compensated bandgap design.
The high resolution read routine is based upon reading counter values and
residuals... it's be
