Driver Drone

Briefly unplug the power supply of the DSO unit to recover from this. You have to live with unstable triggering on negative signal slopes while the unit warms up! The inefficiency should be attributed to a bug in the DSO firmware. Needless to say, the responsibility for any action regarding your DSO is yours! War and Popular Culture: Indeed, I measured a VRT around 3. There is no value of R that guarantees stable triggering on both positive and negative signal slopes at all board temperatures.

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The signal level at the shifter stage is about 40mV per screen division. On the other hand, the correction is applied to data reloaded from disk even though saved data are already transformed; reloaded data are therefore expanded relative to the markings!

Copyrightby Clicliclic. On the other hand, the correction is applied to data reloaded from disk even though saved data are already transformed; reloaded data are therefore expanded relative to the markings! The gain calibration probably cannot absorb a change of VRT from 3.

Hung Chang DSO – [DOC Document]

The corresponding parallel-port operations are detailed in sections 3. Published on Dec View 26 Download 9. I therefore had to analyze the Visual-Basic program that comes with the instrument.

Amplifier Linearity, Rise Time, and Thermal Drift The DSO amplifiers have the usual high-impedance FET input stage a cascode of two 2SKs, where the top FET operates as dxo2100 source follower and the bottom FET as a constant-current active load followed by a HFA current-feedback amplifier gain block followed by a discrete differential stage where the screen offset is added three 2N jelly beans, with some massaging of the frequency response followed by a PNP level shifter 2N and another HFA gain block unfortunately, the built-in clipping function of the HFAs is not used.

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Be sure to have a German dictionary around. Without R-C damping of this order the digital chaang seen at high sampling rates up to about 0. A friendly correspondent, Anton Zechner, from Austria has contributed an upgrade utility http: If the triggering on negative slopes doesn’t stabilize at elevated board temperatures, decrease R There is no value of R that guarantees stable triggering on both positive and negative signal slopes at all board temperatures.

Hung Chang DSO

Oscilloscopio 60 MHz Mod. Some resistors and capacitors in the amplifiers are? The trigger, however, is accepted only before every other sample, causing a vso2100 jitter of two sampling intervals!

Rapid negative signal transitions as exhibited by the calibration signal measured with a probe are therefore regularly after about ns delay followed by false positive ones whence triggering on positive slopes becomes bistable.

Unfortunately, Hung Chang went bankrupt inand driver software that could be linked to user programs, though advertised in the instrument brochure, had never been made available. Consequently, the maximum repetition rate of the DSO at low scan speeds is only half of what one would expect.

Hung Chang DSO 2100

As I see it, this resistor in the positive supply line of the trigger comparator utilizes the switching current spike boosted by C and C78 at output pin 9 to suppress spurious oscillations about 25MHz during the negative transitions at output pin A simple test driver written in Turbo Pascal that implements DSO control via the parallel port can be obtained from the author and may serve as a starting point for programs of your own.

The description refers to the particulars of my board labelled REV – 02 and the components on it or left out!

This gain hhung is corrected for in software: More disturbingly, the distinction between positive and negative signal slopes is unsatisfactory even for the simple 1kHz calibration signal; it looks like the trigger comparator U26 LM suffers from internal ringing, as the unit often triggers on negative edges when xhang for positive ones, and vice versa.

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R01 transfers setup parameters to the DSO; it is explicated in section 2. Bcomparator oscillation may trigger data acquisition on a wrong signal slope.

Although one of the DAC channels used for calibration is reserved for a variable trigger level, on my board some components necessary for this option are left out, and the Hung-Chang operating software makes no provision for setting this channel. The gain correction is taken into account during auto-calibration, but it is omitted in Scroll Mode display; Scroll Mode signals are therefore contracted relative to the screen markings!

The gain correction is taken into account during auto-calibration, but it is omitted in Scroll Mode display; Scroll Mode signals are therefore contracted relative to the screen markings! And don’t ask me for support on this! Without R-C damping of this order the digital noise seen at high sampling rates up to about 0.

Unfortunately, Hung Chang went bankrupt inand driver software that could be linked to user programs, though advertised in the instrument brochure, had never been made available.

You may obtain the schematic from Conrad Electronic. In addition, R should be changed to 1k 2. This is intolerable as you cannot switch to a DC-coupled trigger mode.