Gameboy oscilloscope （2）

Published:2011/8/1 2:52:00 Author:Amy From:SeekIC

No-nonsense two-channel scopes

Next we have a set of five 20- and 30-MHz oscillo­scopes. The GW Instek GOS620 has a convenient layout and is very pleasant to use. The image of the test signal is especially stable and sharp, but the display is quite a bit less bright than that of the Digimess MO20 for example. The latter also has an adjustable trigger delay fholdoff’ function). This can be handy for display­ing complex signals, since it allows an event that would otherwise generate a trigger to be skipped. That’s a nice bonus for a scope in this price class. However, we must note that this instrument makes a somewhat less sturdy impression than its direct competitor, and the display of the test signal is somewhat less steady than with compa­rable scopes.

The Hameg 303-6 is also very easy to use, although it is annoying that the focus setting also changes (consider­ably) when the intensity is changed. Most of the other instruments suffer far less from this problem. Other than that, this model is especially sturdy; it gives the impres­sion that it will never break. It also includes the holdoff function.

The EZ Digital OS-5030 does not have trigger holdoff, but it is still an excellent instrument. Ease of use is right on, and the signal display is bright and clear. As already mentioned, this scope is also available from Conrad, Dynatek and Peaktech under their ov/n brand names and model numbers.

Finally there is the B+K Precision 21 20LV. This scope looks quite robust, and the display is basically good. However, the sample we received for examination had an interference signal that ran across the display. Unfor­tunately, we were unable to discover the cause, but we assume it was something particular to this specific unit. In other respects, this instrument is just as good as the others with regard to features and operation.

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