Warm-up Time for 3 Phase Power Analyzers

[Anand P. Paralkar]

Hi,

I am trying to understand the technical specifications of three phase
power analyzers and I see a "warm-up time" mentioned for a couple of
products.

For example:

Amplitude accuracy ±0.05% rdg. ±0.01% f.s. (DC, or 45 to 66Hz, after 10
minutes of warm-up time)
Phase accuracy ±0.2° (45 to 66 Hz, after 10 minutes of warm-up time)

(See: http://www.hioki.com/product/3390/index.html bottom of the page)

I see some other brands that require upto 30 minutes of warm-up time.

I would like to know why this warm-up time is required and possible
solutions to the problem.

Thank you for your time.

Thanks,
Anand

 

[Jamie]

Hi,

I am trying to understand the technical specifications of three phase
power analyzers and I see a "warm-up time" mentioned for a couple of
products.

For example:

Amplitude accuracy ±0.05% rdg. ±0.01% f.s. (DC, or 45 to 66Hz, after
10 minutes of warm-up time)
Phase accuracy ±0.2° (45 to 66 Hz, after 10 minutes of warm-up time)

(See: http://www.hioki.com/product/3390/index.html bottom of the page)

I see some other brands that require upto 30 minutes of warm-up time.

I would like to know why this warm-up time is required and possible
solutions to the problem.

Thank you for your time.

Thanks,
Anand

If it is a precision device, which most likely it is, it's very
common to have warm up times. The device was calibrated at a fix
temperature and thus can effect precise readings. For rough or average
readings, you can get away with out waiting for it.. But expect the
reading to be a little different, if only by a very small fraction
after the unit has warmed up.

 

[Josepi]

What he said.

We had some precision equip. years ago that had a crystal oven in it to keep
the crystal oscillator running at an exact freq. It took a few minutes to
insure the crystal was warm enough.


If it is a precision device, which most likely it is, it's very
common to have warm up times. The device was calibrated at a fix
temperature and thus can effect precise readings. For rough or average
readings, you can get away with out waiting for it.. But expect the
reading to be a little different, if only by a very small fraction
after the unit has warmed up.

 

[Josepi]

What he said.

We had some precision equip. years ago that had a crystal oven in it to keep
the crystal oscillator running at an exact freq. It took a few minutes to
insure the crystal was warm enough.


If it is a precision device, which most likely it is, it's very
common to have warm up times. The device was calibrated at a fix
temperature and thus can effect precise readings. For rough or average
readings, you can get away with out waiting for it.. But expect the
reading to be a little different, if only by a very small fraction
after the unit has warmed up.

 

[Josepi]

What he said.

We had some precision equip. years ago that had a crystal oven in it to keep
the crystal oscillator running at an exact freq. It took a few minutes to
insure the crystal was warm enough.


If it is a precision device, which most likely it is, it's very
common to have warm up times. The device was calibrated at a fix
temperature and thus can effect precise readings. For rough or average
readings, you can get away with out waiting for it.. But expect the
reading to be a little different, if only by a very small fraction
after the unit has warmed up.

 

[Winston]

[snip]

5. Expect trouble from the electronics tech union if warm-up times are
reduced as this will cut into those extra coffee breaks. ;-)

And steer clear of the unicorns and flying pigs.

They can be brutal.

--Winston