Now that you mention it, I don't think I confirmed that the voltage to
the fan was higher. I just assumed that it was. I'll have to redo that
test.
Ed
Pete Rawson wrote:
Ed,
From your description of the fan noise, I have one concern.
If the fan speed seems to increase without a good cleaning
or change in the supply voltage, then it's likely that the airflow
has been decreased, an obvious speed up is not good news.
Pete Rawson
On Mar 9, 2010, at 10:44 PM, Ed Palmer wrote:
I have a question for owners of the HP 5372A (and probably 5371A) Time Interval
Analyzer.
Is the fan on the back blowing out or sucking in?
I was looking at mine to see about replacing the fan with a quieter one and I
was surprised to see that mine is sucking in. This doesn't make sense to me
for two reasons:
1. It blows hot air out the front and bottom straight at the operator.
Uncomfortable on a hot day.
2. Just inside the unit at the back on the motherboard there's a temperature
sensor that controls the fan speed. Why would you blow cool outside air over
the temperature sensor?
It would seem to make more sense to have the fan blowing hot air out the back
and drawing the hot inside air over the temperature sensor. I experimented
with this configuration and found that the noise level went up because the fan
was turning faster - no big surprise there.
I can't find any info in the manual (service or operating) about this.
Ed
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