HAMEG. OSCILLOSCOPE HM Specification. TLOPL HH4E. Vertical Deflection (Y). Bandwidth: of both channels. DC MHz (-3dB), DC MHz (- 6dB). OSCILLOSCOPE HM I Overscanning I Bandwidth DC MHz H Delayed Sweep H LPS Triggering to 40 MHz The HM demonstrates the. Hameg HM Oscilloscope problem. «on: January 16, , pm». Hey guys. The other day i went to the old stuff market and saw this oscilloscope.

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HAMEG hm Oszilloskop Oscilloscope | eBay

The duration of a signal period or a portion of the waveform is ascertained by multiplying the relevant time in cm by the time coefficient selected on the “TIMEBASE” switch.

In so doing, the square pulses must have a flat top without ramp-off, spikes and glitches; no overshoot is permitted, especially at 1 MHz and a display height of cm. To minimize drift, the input stages of the pre-amplifiers are monolithic integrated circuits.

The fuse holder with its square top plate can be pulled out, and changing of the voltage is possible by turn- ing this plate 90 degrees for each of the four AC voltages marked on the plate see triangle below the fuse holder.

A criterion in chopped operation is trace widening and shadow- ing around and within the two traces in the upper or lower region of the screen. Pay attention, therefore, to this indication. In the xlO mode the characteristics are the same as the HZ The clamp on the CRT neck has to be loosened. This oc- curs, for example, with burst signals. The correct display is shown in the following figure. Therefore, all HAMEG instruments are under warran- ty for a period of one year, provided that no modifica- tions have been made to the instrument.

For this the time fine control “x1 -x1 0” must be set to x1 rotate anti-clockwise until a snap noise is audible. Accessories optional Attenuator Probes xIO and x This ground point should always be located as close as possible to the measuring point. However, this work should only be carried out by properly qualified per- sonnel.


A cer- tain loss of marginal sharpness of the CRT is unavoidable, this is due to the manufacturing pro- cess of the CRT. To obtain a display the following procedure should be adopted.

Compensation range pF. HZ 37 Oscilloscope Probe x 1 00 The HZ 38 is a x 10 attenuator probe which has been specially designed for the investigation of relatively high frequency signals. If the DC potential of the ramp output voltage is not required then a capacitor hmm be connected in series with the out- put connector.

This probe is connected to the test circuit by a sprung hook and integral ground lead with an insulated crocodile clip. The delay time now amounts to 5ms.

Oscilloscope HM412

For higher frequencies, and when the signal source is of low impedance, a cable of matched characteristic impedance usually 50Q is recommended.

The instrument has a plug-in unit at the rear. HZ 34 Test Cable BNC – BNC When the oscilloscope is used for field service applications the HZ 43 carrying case will prove to be invaluable, as it has been designed to protect the instrument and provide storage for acces- sories and tools. None of the push buttons should be depressed.

Oszilloskop HM412-5

For external triggering in the “DC” coupling mode, signal voltages of approx. CRT phosphor could be damaged under this conditionprobably the push- button for the “Hor.

In this mode a baseline will be present In the absence of a test signal. An increased trigger sensitivity creates the risk of response to the noise level in the trigger circuit. Checks can be made with any sine-wave voltage between 50Hz and 1 MHz.

However, both LED’s will be on, if one trace is above and the other one is below the usable screen area. The in- strument should be placed in a clean and dry room. Internally the printed circuit boards are easily accessable to facilitate ease of main- tainance, should this be required. The trimmer can be adjusted to equal the input capacitance of the oscilloscope, then the impedance of the HZ 23 is equal to the specified Input impedance of the oscilloscope under test.


For the measurement of the high voltage ripple you need a probe capable to withstand V e. Any reduction of this brightness can only be judged visually. However, a complete recalibra- tion of the oscilloscope should not be attempted by an inexperienced operator, but only someone with suffient expertise.

However, smaller signals than this may also be displayed. The magnitude of the ap- plied hamrg is ascertained by multiplying the selected deflection coefficient with the display amplitude in cm.

This is achieved by adjusting the trim- mer located in the 2: Overscanning; indicated by 2 LED’s. The display of simple electrical processes such as sinusoidal RF and AF signals or 50Hz ripple voltage poses no problems. Additionally, as already mentioned, for frequencies above 20MHz the dynamic range of the display height steadily decreases.

It should be noted that the probe reduces the input voltage by a factor of Instrument Case Removal The rear cover can be taken off after both nuts on it have been removed and after unplugging of the power cord’s triple-contact connector.

The following figure shows correct positioning of the oscilloscope trace for accurate risetime measurement. These voltages are measured on the Gm Socket with reference to ground see Adjusting Plan.

It is important to note that the x5 magnifier in- corporated in the “X-POS. The final vertical amplifier incorporates the Overscanning facility.

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