Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
Fungus:
--- Quote from: daybyter on September 20, 2017, 11:45:36 am ---Did you exchange the test leads? Cleaning the tips of my 830 test Leeds with some sanding and alcohol made the buzzer louder.
--- End quote ---
It shouldn't make any difference to the buzzer volume. The buzzer will be triggered by a comparator (or something similar).
tooki:
--- Quote from: Fungus on September 20, 2017, 04:36:09 pm ---
--- Quote from: daybyter on September 20, 2017, 11:45:36 am ---Did you exchange the test leads? Cleaning the tips of my 830 test Leeds with some sanding and alcohol made the buzzer louder.
--- End quote ---
It shouldn't make any difference to the buzzer volume. The buzzer will be triggered by a comparator (or something similar).
--- End quote ---
Not only that, but in the AN8008 it’s latched, so it’s the MCU driving the buzzer.
Mr. Scram:
It occurred to me that the battery voltage might play a role in this, even though I put what I thought to be fresh batteries in both. I just swapped the batteries of the two units, but that doesn't make a difference.
I also already encountered the gap between the milliamp and microamp range, which is a bit disappointing. I got confused by the different readings for a while, until I realised the AN8008 actually shows a consistent change in readings when you have plugged the leads into the wrong sockets. You get perfectly consistent but incorrect readings when you use the microamp scale, but plug the leads for the milliamp scale. It doesn't help that both units show the exact same wrong reading.
retrolefty:
--- Quote from: Mr. Scram on September 19, 2017, 11:33:22 pm ---I just received my second AN8008 and it seems to have taken 8 days. In both cases, delivery was ridiculously quick. Both came from the same seller. The serial numbers are only twohundredsomething apart, which doesn't seem too unlikely coming from the same source with only three weeks between them. What surprised me a bit is that the beep or buzzer of the new unit isn't by far as loud as the one of the first unit. I have taken them both apart to check for any differences, but there isn't anything visible that would explain why one is much louder than the other. The boards look exactly identical, with the lone exception being the oscillator packages that are installed rotated a 180 degrees with respect to each other. The hand soldered joiints don't seem to look as neat as the machine soldered ones, with some component legs having very little solder.
Calibration hasn't been checked. That will be something to do in the near future.
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I too bought a second unit (gave the first to a friend) about a month apart but from a second seller on e-bay. My buzzer is barely audible. I too took mine apart to investigate. Found putting some tape over the hole made it twice as loud but still weak for my old hearing. Kind of a bummer but I don't rely on the buzzer much anyway and I still think this a nice cute DMM.
flywheelz:
Could someone compare the frequency the buzzers are running at? Loud vs Quite. Perhaps they started using different batch of buzzers that require a different frequency, even 500Hz off make a huge difference.
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