Thanks to you I've just purchased one of these XDM1241 bench meters from Banggood. It was only £77.95 versus the £98 I'd paid Banggood some 2 or 3 years ago for an XDM1041. They're excellent value for the money and a better option than cluttering the bench with a couple of 9999 counts Mestek hand helds.
Of course, they're no match to the SDM3065X as far as resolution and tempco performance are concerned but much better than those 9999 counts Mesteks I'd been using, both in terms of resolution and tempco.
I'd already pushed the boat out on the SDM3065X, primarily for its very low temperature coefficient, before buying the XDM1041. The 6.5 digit resolution was secondary to my needs (overkill I'd thought at the time of purchase) until I realised I could monitor the lamp and crystal voltages from my LPRO 101 based rubidium frequency reference with enough precision to see variations that would have been barely perceptible with lower spec Siglent bench meter models with regard to the LPRO's temperature and supply voltage behavior.
I've had that XDM1041 monitoring the crystal tuning voltage in my MK II GPSDO 24/7 for the past 2 or 3 years. With the backlight reduced to a more than adequate 25% mark, it only draws 1.5 watts (or less, I can't remember exactly - it might even have been as little as 1 watt) so more than acceptably low enough to leave permanently powered up. Heck! I'd considered the 22W draw of my SDS 1202X-E to be low enough to leave that more or less permanently powered 24/7 over a four or five year period until about a year ago.
The point in this case being that such 24/7 year in year out operation has failed to show any deleterious effect on its performance, particularly with regard to the display panel's endurance - it seems just as bright and fresh as the day I set the backlight to its 25% setting.
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