The point of this on the 2465s is that it allows the user to validate the
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time base accuracy on the spot. For this purpose, the poor rise and fall of
the calibrator are unimportant, as you just line some part of the rise or
fall up to the graticule for a check.
It sure looks ugly at fast sweeps though :).
On Wed, Mar 27, 2019 at 20:43 Tom Gardner <tggzzz@...> wrote:
I don't like the "calibrator" output on the 24x5 series: the period
according to the timebase so that there is always 5 cycles on the display.
high sweep speeds (i.e. much faster than1ms/div) the poor risetime of the
calibrator signal is evident.
The only practical use for a calibrator output is to calibrate the low
frequency response of a *10 "high" impedance probe. For that, all you need
couple of cycles of a 1kHz waveform with a flat top - and you just tweak
scope probe so that its response looks flat. There are many descriptions
to do that.
Summary: if you have fast sweep speeds (say <1us/div) and the waveform is
distorted, don't worry because that is normal. If, OTOH, the waveform is
distorted at 200us/div, then tweak the probe. If a problem remains, post a
On 26/03/19 13:29, Marcial Gomez Varas wrote:
Hi everyone,time to play with (having 2 kids and a travelling job doesn't help!)
I bought some time ago (2017) a TEK 2465B that I didn't have too much
I have been toying with it lately, and I've discovered that thecalibrator is showing some really awful square signal.
fall lines, and bouncing on the high level.
It's clearly NOT square ! It has quite a bit of slope in the rise and
I have checked and both the output levels and frequency seem to be OK,but somehow the signal is distorted.
in the A1 board, section 5 (That should be in the middle left side, am I
Could it be some capacitor? Looking at the service manual it shows to be
Any help would be appreciated !