If we really wanted to test switches, what is the shortest length brownout
that would affect electronics during normal operation (i.e., make a flight
computer reset)?
I.e., if you ran a data logger to measure resistance, what sampling
frequency would be required?
John
On Thu, Jan 19, 2017 at 12:55 PM, R Dierking <applerocketry@xxxxxxxxxxx>
wrote:
I really wonder about that 300 operations number. It isn’t listed as a
MTBF. It does seem low compared to other switches. Also, keep in mind
that other types of switches (for example, household types of rocker
switches) are intended to be operated many times. So, the statistical
number of cycles before a failure would be very important. Perhaps they
just decided to put a low number of cycles for a lifetime of the switch so
people wouldn’t use them for other applications?
Here’s another important consideration: Say you are planning on using a
Microswitch to arm electronics. Chances are, you will need to create some
mechanism to do this. But, how durable and reliable will your mounting and
operation of the switch be? Would you be able to cycle it 10,000 times?
Just saying that I’ve had the little tube that guides a pull rod on a
microswitch fail when the epoxy came loose.
So, there are many considerations, and we never run out of stuff to cause
us to lose sleep. 😊
Richard Dierking
*From: *Gregory Lyzenga <lyzenga@xxxxxxxxx>
*Sent: *Thursday, January 19, 2017 12:35 PM
*To: *roc-chat@xxxxxxxxxxxxx
*Cc: *Allen Farrington <allen.farrington@xxxxxx>; Vern Knowles
<knowles.vern@xxxxxxxxx>
*Subject: *[roc-chat] Re: Switch Warning - Schurter 110-220
On Jan 19, 2017, at 12:22 PM, R Dierking <applerocketry@xxxxxxxxxxx>
wrote:
Now, I think Vern has identified the most likely cause of this problem.
The switches are ‘cooked’ prior to even being used.
You should be careful not to assume there is just one singular failure
mode. Soldering damage doesn’t seem like it would explain the
manufacturer’s small number of rated cycles. There may be more than one
factor in play.
- Greg
----------------------------------------------------------
Gregory A. Lyzenga <lyzenga@xxxxxxx>
Dept. of Physics, Harvey Mudd College (909) 621-8378
Claremont, CA 91711-5990 mobile (626) 808-5314
