| Calibration of EASERA Gateway |
 Posted: Tue Nov 08, 2005 3:46 am |
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| Arthur |
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| Joined: 06 Jun 2005 |
| Posts: 16 |
| Location: Canada |
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| With the input gain/trim controls on the front of the EASERA Gateway, what is provided to keep the mic calibrated for SPL measurements? |
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| Posted: Tue Nov 08, 2005 2:12 pm |
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| Stefan |
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| Joined: 19 Apr 2005 |
| Posts: 167 |
| Location: Berlin, Germany |
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| Hi Arthur,
like for all devices that have external gain controls the safest way is to recalibrate the measurement setup after any of the gains have been changed.
However, in particular regarding the Gateway/FireBox we have the advantage that the controls are stepped and relatively well-behaved. Generally, a gain setting is reproducible within 0.25-0.5dB. While more is desirable this is certainly enough for typical room acoustic measurements.
Additionally note that the EASERA Gateway does also provide an exact input boost of +12dB. Also, because of its more than 100dB dynamic range, you can easily utilize the EASERA digital output gain for calibrated volume control.
As a result we think that this combination is more than sufficient for most types of measurement, especially when looking at the price / performance ratio of the Gateway.
Stefan |
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| Posted: Tue Nov 15, 2005 11:43 am |
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| Peter Patrick |
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| Joined: 26 Apr 2005 |
| Posts: 33 |
| Location: Toowoomba - AUSTRALIA |
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| Hmmmmmmm.....
I suspect this means EASERA is not kept informed of the angular location of the potentiometer and therefore has no idea what the real gain is.
Detents are fine but a pot on a VCA which reports the gain setting to the software makes a lot more sense to me!
OK ... I dream again!
Best
P.J.P. |
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_________________
Peter J. Patrick |
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| Posted: Sun Feb 12, 2006 6:02 am |
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| Ron Sauro |
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| Joined: 29 Oct 2005 |
| Posts: 27 |
| Location: Elma, Wa |
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| Peter and Arthur.... the pots have knobs on them that are removable... After removal of the knob the shaft only extends about 1/16 of an inch from the front panel.... John Prohs invented some plastic covers that are self sticking that cover the shafts and allow setting a fixed gain and then calibration and the storing and transportation of the Gateway without affecting the settings .... So you end up with a fixed gain system and the calibration remains solid
Ron Sauro
NWAA Labs
www.nwaalabs.com |
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