One of my scopes is a Hitachi V-1050F, 100-Mhz. Probably similar.
The calibration node says "CAL .5V", and the signal is a 0 - 0.5v
1-Khz square wave. Probably intended to calibrate a 10X probe.
- dan michaels
That's a normal scope calibration waveform. It has nothing
to do with the power supply. You use it to set the vertical
position and vertical gain calibration.
You don't see that much any more. "TV mode" syncs well
on TV sync waveforms. It's not for watching TV on the scope.
Try running a composite video signal into the scope, set
the sweep rate for about 15.5KHz, set TV mode, and see
what you get.
Not for watching TV on the scope, but for watching TV signal
on the scope...
it's two channel, each channel has knobs:
1)volts per division
2)position (set zero)
there is a mode selector between the channel knobs:
I know what all these do, but I don't know what the [X Y] label means
on the dual mode selection.
the main controls are:
1)power/intensity (turns on machine, varies brightness of beam)
2)focus (varies focus of beam)
3)trace rotation (varies rotation of beam)
4)time per division (.2seconds to .2us)
5)swp var cal (calibrate the time per division?)
6)pos (change horizontal position of beam)
the TV mode has it's own section on the front panel,
TV mode switch:
TV source switch:
4)ext (points to "trigger input", which is BNC scope lead connector,
came with a BNC to RCA adaptor, so you can plug RCA cable into it)
there is a "level" knob (+, - potentiometer)
the area on the panel which is related to TV is shaded brown, just like
the mode selector between channel1/channel2 controls.
what do the VAR knobs do? is this just to calibrate volts per division
and time per division?
I'd like to figure out the TV mode, so I can look at NTSC signals and
On 8 Feb 2006 11:34:12 -0800, firstname.lastname@example.org wrote:
This could be several things. At higher sweep rates it's probably
alternate (it toggles between ch1 and ch2 inputs with each sweep,
displaying each one at a time, but it's fast enough that it looks like
both at once) and slower rates it's chop (the trace is quickly
switched back and forth between ch1 and ch2 as the beam is swept from
left to right, appearing to display them both simultaneously).
"XY mode" means that one channel directly controls the X position
(instead of the sweep section generating it) and the other controls
the Y position (as it normally does).
This shows what you can get by putting different frequencies of
sinewaves into the X and Y inputs:
or google for Lissajous.
There's a detent at the 'cal' position, when it's at that point the
sweep speed is what the time-per-division switch says it is. You can
turn this to vary the sweep speed over a small range (perhaps seeing a
part of a waveform you otherwise can't), as opposed to the larger
steps the rotary switch gives.
The gain variable controls do the same as the sweep variable does.
You set them at the 'cal' position and the display is 1V per division,
5V per division or whatever that switch is set for. You can turn the
control to get in-between gains, but you won't know the exact gain at
that point without putting in a known voltage and seeing where the
trace goes on the screen.
This might be fun for a little while, but anything you learn about
that will be obsolete in just a few short years.
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