Recommend to a Friend
Frequency meter
5.0
Good product,exellent service from the seller.
Luis Salinas on
Jun 01, 2021
Recommend to a Friend
TTI TF930 Frequency Counter
4.0
TTi TF930
3GHz Universal Counter USB
The TTI TF930 promptly arrived (one week from ordering) in good protective packaging. I put the counter through its paces using a Rigol Spectrum Analyzer and an HP RF Frequency Generator. The triggering levels, stability and count accuracy were all according to specification as far as I can determine. On the con side, I was disappointed with the fact that the counter LCD display isn’t back lighted. Sales and marketing photos show a bright well lighted display. The display is hard to read in all but a brightly lighted room. I wouldn’t advice field maintenance use of the counter in dimly lighted ATC, communications or studio control rooms. Why wouldn’t you include back lighting in what should be a quality instrument? The only thing that comes to mind is that the counter can be battery operated and the thought must have been to economize on battery life. Otherwise, a good counter for the price.
Verified Purchase
Samuel Sespaniak on
Nov 20, 2017
Recommend to a Friend
TTi TF930
5.0
Absolutely Love it, Accurate easy to use, Cost effective. Don't know how I got along without it.
My one and only improvement I would like to see on this unit is switchable back lighting.
would not trade for even a higher price unit.
you have to get one, You will love it!!
I run a Radio Repair Shop and by far this is the best counter I have ever used. Good Work and thank you for making this product available.
Lawn Mower Man on
Aug 30, 2017
Recommend to a Friend
TF930
5.0
Good manual and easy to use. Specs good. The battery and or USB power is very handy for portable use. Unit is light yet case is strong enough for general/moderate usage. Probably need to get a case for it someday... I see no issues with the unit after several months in the field...
Randy on
Jan 07, 2017
Recommend to a Friend
3 GHz frequency counter
5.0
Generally an excellent counter, especially considering the low cost.
The device is amazingly light. I worried a little about the plastic case with respect to shielding but have not yet noticed any problems.
Operation from the internal NiMH batteries is a nice idea and undoubtedly the use of an unlighted LCD display is related to being able to run for ~24 hours. Good to see the cells are replaceable. The counter will intelligently select from the AC adapter, a USB connection, or the batteries.
I found a nice service manual by TTi online that describes the closed-box calibration process in detail if one has an accurate frequency reference. I was really happy to see this as I can then make an annual calibration to something like a GPS disciplined oscillator for max accuracy.
The counter seems to easily meet its specs regarding accuracy. The manual lists /- 0.2 ppm and my comparison with an OCXO recently calibrated against a Cs source indicated about a -0.1 ppm accuracy. I also like the ability to feed in a 10 MHz reference to which the internal oscillator will phase lock.
Regarding the manual - I'd have to say this is the most well-written manual I have seen in quite a while. Clear explanations and no shying away from detailed articulate descriptions of measurement principles for the interested reader.
The threshold control works very well. For measurements with plenty of signal, the counter works fine with just about any threshold setting. The setting can be important for weaker signals. At one point I fed in a 4 mV signal and with careful adjustment of the threshold setting could get a nice stable count even though that signal level is well below the specs stated in the manual.
The gate time settings work very well and I like the rolling average approach. So when you first apply a signal with the 100 second gate time, you wait 100 s to see a count but then the display updates every 2 s giving the most recent 100 s count. It was interesting to suddenly change the input signal from, say, 5 MHz to 10 MHz and watch this rolling average gradually climb up to 10 MHz. Of course, shorter gates times update much quicker.
The reciprocal counting method seems to work well, especially with low frequency signals. With a signal like 10 Hz, my old Heathkit counter shows 10 or 11 Hz and if you want more accuracy you use the period measurement mode. With the reciprocal method (nicely explained in the manual) either the frequency or period method shows equivalent resolution and accuracy.
Overall, I am completely happy with this purchase.
Verified Purchase
Paul Schulte on
Dec 15, 2015
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