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UNI-T UT61E Multimeter teardown photos.
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ocw:
I must have made a good banana plug to BNC cable--I didn't see a significant change when instead of using the cable, making it clumsy and using a banana to BNC adapter instead.
I'm not sure what duty accuracy you are looking for, but this is what I measured on the UT61E:

Freq    Waveform           D Cycle
100 MHz   Sine           5.0%
90 MHz   Sine           6.7%
80 MHz   Sine           15.3%
70 MHz   Sine           25.0%
60 MHz   Sine           30.7%
50 MHz   Sine           34.9%
40 MHz   Sine           41.3%
30 MHz   Sine           42.1%
20 MHz   Sqr 50%   44.8%
15 MHz   Sqr 50%   45.9%
15 MHz   Sqr 32%   35.0%
15 MHz   Sqr 68%   58.6%
10 MHz   Sqr 50%   46.9%
5 MHz   Sqr 50%   48.0%
1 MHz   Sqr 50%   49.4%

The duty cycle reading being displayed on the UT61E depended on the input voltage.  If that voltage was just enough for an accurate frequency reading, the duty cycle reading would be low.  Double the voltage and the duty cycle reading would be much more accurate.  Since I was unable to increase the RF voltage for the higher frequency readings, the accuracy of their duty cycle readings seen was compromised by that.

 
mos6502:
Great job, thanks! Of course, the measurment of the duty cycle depends on the trigger level, so it's really only meaningful for square wave signals. But it looks like the duty cycle measurement is useful to at least 1MHz.  :-+

Duty cycle measurement is really useful for a lot of things. E.g. if you wrote a multitasking scheduler for your microcontroller, you can set a pin at the beginning of your task and reset it at the end of your task, and by measuring the duty cycle you can directly see how much of the CPU time that task consumes in percent.
ocw:
I forgot about the higher output power available from my HP 3200B VHF generator.  Taking it to a metered output of +23.5 dBm/224 mW/3.346 V (1.7 dB beyond its rating) the UT61E was able to measure its output frequency up to 225 MHz.  Uni-Trend hasn't over-rated it.  But, there's a reason why their specs don't show its counter's sensitivity.
xZero:
Is this one still worth consideration in 2015? Or is there something better for same price?  :P
Thanks in advance!

I was on cheap one, and finally gonna move to something better with PC connection.
I work primarily with electronics and informatics (hardware).

mos6502:

--- Quote from: xZero on September 11, 2015, 04:34:15 pm ---Is this one still worth consideration in 2015? Or is there something better for same price?  :P
Thanks in advance!

I was on cheap one, and finally gonna move to something better with PC connection.
I work primarily with electronics and informatics (hardware).

--- End quote ---

Do you need the PC connection? If not, I'd go with the newer UT139C. Much better construction, faster display, actually has input protection, temperature measurement, real fuses and has a backlight. Only 6,000 counts, but unless you have specific requirements, that's perfectly adequate.
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