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 Posted: Apr 08, 2012 - 07:51 PM |
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Joined: Aug 05, 2005
Posts: 267
Location: Tacoma, WA
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Does anyone have experience with UniSource test equipment? Specifically the UniSource DM 9241B.
http://www.testequipmentdepot.com/unisource/multimeter/dm-9241b.htm
This is a very capable appearing bench multimeter at a reasonable price. I have never heard of them before, but shopping around for a new MM I came across this one. I understand that they are designed and made in South Korea. I am thinking of purchasing one, and I wonder if any of you guys can comment it?
Jim |
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Posted: Apr 08, 2012 - 07:55 PM |
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Joined: Apr 20, 2007
Posts: 6072
Location: Long Island New York
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Nice amount of gear in one box for a nice price.
Only way of finding out how good it really is would be to buy one and take it for a drive. Is there a return if not happy? |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first 
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Posted: Apr 08, 2012 - 10:16 PM |
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Joined: Aug 04, 2002
Posts: 1706
Location: Brisbane, Australia
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The specs look suspect.
Note the discrepancy between the stated maximum display count and the TOLERATED values.
Get the vendor to clarify this |
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Posted: Apr 21, 2012 - 05:05 AM |
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Joined: Aug 05, 2005
Posts: 267
Location: Tacoma, WA
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Well, I got the instrument today. Right off the bat there was no manual in the box. The specs state that it is shipped with a manual.
I did some preliminary testing and I am not pleased, but I must confess that I am confused by the accuracy specification. Perhaps someone can clarify. Maybe this can be an exploration of test equipment accuracy in general. According to the datasheet the accuracy for resistance measurement is as follows:
Accuracy
Range Reference % + dgts Resolution Tolerated values
400 370.0 .030 + 15 .001 369.874 to 370.126
Using the same 1% resistor I get readings ranging from 99.915 to 99.879 ohms. The difference is 0.036 ohms or .036%. I clipped the leads to the resistor as closely as I could to the same points. My Fluke 189 measures the same resistor at 100.08 + or minus .01 ohm over 10 or so measurements of the same resistor.
This test raises some questions. First, does the 9241B meet its own specified accuracy? Second, does my test procedure have any validity? Third, like the man with two watches, I don't know which meter is right, if either of them is right. Is there a better way to test this short of sending it to someone for calibration?
Finally, does this device appear to perform in a manner similar to known and respected "highly accurate" bench multimeters?
Jim
[url]
http://www.testequipmentdepot.com/uniso ... -9241b.pdf
[/url] |
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