EW Model D Logger

Our club has an EW Model D logger. In the process of getting things ready
for flying this year, I got the loggers out, put in fresh batteries, and did
a test run in the car. I got a strange altitude plot from the EW model D.
It was very "notchy'' with the altitude not changing for several samples,
and then jumping. This was true for both the pressure altitude from the
internal sensor and the GPS altitude from the Garmin.

Looking at the altitude graphs on SeeYou and at the actual log file in
Notepad, I could correlate the "flat sections" with multiple sequential B
records where the altitude would not change for either the pressure altitude
or GPS. The pressure altitude only changes in increments of 5 meters. It
is always a multiple of 5 meters. The GPS altitude is always a multiple of
10 meters.

Anyone have any thoughts or suggestions?

John Scott

Try removing the battery cover and inserting a piece of stiff wire (e.g.
straightened out paperclip) into the small hole in the panel that lies just
behind the end plate. This will do a full system reset.

David Starer

"John Scott" wrote in message
.. .
Our club has an EW Model D logger. In the process of getting things ready
for flying this year, I got the loggers out, put in fresh batteries, and
did a test run in the car. I got a strange altitude plot from the EW
model D. It was very "notchy'' with the altitude not changing for several
samples, and then jumping. This was true for both the pressure altitude
from the internal sensor and the GPS altitude from the Garmin.

Looking at the altitude graphs on SeeYou and at the actual log file in
Notepad, I could correlate the "flat sections" with multiple sequential B
records where the altitude would not change for either the pressure
altitude or GPS. The pressure altitude only changes in increments of 5
meters. It is always a multiple of 5 meters. The GPS altitude is always a
multiple of 10 meters.

Anyone have any thoughts or suggestions?

John Scott

John Scott wrote:
Our club has an EW Model D logger. In the process of getting things ready
for flying this year, I got the loggers out, put in fresh batteries, and did
a test run in the car. I got a strange altitude plot from the EW model D.
It was very "notchy'' with the altitude not changing for several samples,
and then jumping. This was true for both the pressure altitude from the
internal sensor and the GPS altitude from the Garmin.

I'd expect that. From the manual, page 11 section 1.1.4

Altitude resolution: -350m - 10,000m: 5 metre steps
10,000m - 15,000m: 10 metre steps

Looks to me as if your model D is working correctly.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

At 23:36 01 April 2007, John Scott wrote:Our club has an EW Model D logger. In the process
of getting things ready for flying this year, I got the loggers out, put in
fresh batteries, and did a test run in the car. I got a strange altitude plot
from the EW model D. It was very 'notchy'' with the altitude not changing
for several samples, and then jumping. This was true for both the pressure
altitude from the internal sensor and the GPS altitude from the Garmin.Looking at the altitude graphs on SeeYou and at the
actual log file in Notepad, I could correlate the 'flat sections' with
multiple sequential B records where the altitude would not change for either
the pressure altitude or GPS. The pressure altitude only changes in increments
of 5 meters. It is always a multiple of 5 meters. The GPS altitude
is always a multiple of 10 meters.Anyone have any thoughts or suggestions?John Scott JohnYou have tested the system in a car, so the height
changes are small and happen slowly. The model 'D'
records in 5 metre steps, so what you describe is exactly
what we would expect to see, there is nothing wrong
with the unit.RegardsGraham Paul