Products > Test Equipment
UNI-T UT61E Multimeter teardown photos.
Wytnucls:
The UT61E has a strange 'Peak Hold' implementation.
Usually on other meters, 'Peak Hold' displays very fast measurements of the AC sine wave positive peak voltage, with a max/min around that voltage.
On the 61E, 'Peak Hold' goes through a calibration first and then displays The Max (positive) and Max (Negative) of the sine wave voltage, with slow updates of about 2 samples per second. The bar graph keeps on displaying the TRMS voltage for that sine wave, instead of the peak voltage.
Robomeds:
--- Quote from: Wytnucls on December 04, 2013, 04:10:13 am ---Still the cheapest option for a new sturdy 4 1/2 digit TRMS meter with autoranging. It is not a perfect meter by any means, but quite usable and probably the best value for a hobbyist on a budget.
--- End quote ---
Since you said "new" I would agree. If you are willing to shop ebay and live in the US (one or both will be 'no' for many people) I think you can do much better. For the same money I've seen these meters used, all of which strike me as better than the UNI-T
Amprobe AM140 (Brymen with 500,000 count display)
http://www.ebay.com/itm/Amprobe-AM-140-TRMS-Digital-Multimeter-With-Leads-WOW-NR-/161166659089?pt=LH_DefaultDomain_0&hash=item2586480e11
BK version of this meter (an ancestor of the current Agilent meters) Note this is 40,000 count but has very good accuracy.
http://www.ebay.com/itm/Hioki-3801-Digital-HiTester-Multimeter-/290889897049?pt=LH_DefaultDomain_0&hash=item43ba639459
BK 5390 (a favorite of mine). Rare on ebay but I got one for $35 and did a tear down of the meter. 0.025% DC, water proof (a need I haven't needed ;) ) and 50k count.
A number of old bench meters.
lagman:
I just received my UT61E that I ordered when I saw that everyone is happy with it. And I like it!
Unfortunately I'm unable to use the data logging function using the serial cable and a USB to serial adapter. (http://dx.com/p/usb-to-rs232-dongle-with-extension-cable-5859)
The adapter is plug and play and I can see it linked to COM4 in "device manager". I installed UT61E v4.01 exe and connected to COM4 but I get nothing...
It's the first time I use RS232 so maybe I'm doing something wrong?
Benik3:
Maybe different voltage output?
RS232 can be +-5V, +-10V, +-12V or +-15V.
Or there is also TTL +-3.3V but it's not probably this...
lagman:
Hum... I know absolutely nothing about RS232. :palm:
I suppose that being powered by USB it can't be more than 5V. I looked at RS232 pinout and couldn't find a power pin!?
I checked all pin voltages on the USB to RS232 adapter and all are at 0V apparently. Is that normal?
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