HAMEG. OSCILLOSCOPE HM Specification. TLOPL HH4E. Vertical Deflection (Y). Bandwidth: of both channels. DC MHz (-3dB), DC MHz (- 6dB). HM analog oscilloscope. Discontinued. More info in German for HM at · Manual for HM here. Timebase The HM timebase incorporates an LPS trigger circuit, a new technique developed by HAMEG. The complete triggering process is carried out by a.
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For example when investigating AF signals from a high impedance source the possibility of hum pick-up and crosstalk is greatly reduced as the signal Input 4 mm plug is completely screened. This is best seen by displaying a square-wave signal with the repetition rate of approximately 1 MHz. S2 While the measurement takes place the position con- trols of both deflection devices must be in mid- position. For this the time fine control “x1 -x1 0” must be set to x1 rotate anti-clockwise until a snap noise is audible.
The complete triggering process is carried out by a monolithic integrated hmaeg voltage comparator with TTL output. When the Sweep Delay mode slide switch is set to the “norm. Operation of the sweep delay is relatively easy, as only three controls need to be used, an LED indicates the operating mode.
Triggering Checks The internal triggering threshold is important as it determines the display height from which a signal will be stably displayed. The delay time now amounts to 5ms. The sum of the two channels is displayed in the Add Mode, if channel I is then inverted a differential display is obtained.
SM5CBW’s Hameg Oscilloscope Presentation
As the HM is a fully transistorized oscilloscope the heat generation of the instrument is very low, thus ensuring long term reliable operation. Ventilation holes are provided in the case so that instruments with a maximum consumption of 30 Watts can be operated in the case.
It is recommended that any adjustments that have to be carried out inside the instrument are undertaken by qualified personnel. When triggering at mains frequency, actuation of the “TV” push button should have no effect.
For RF suppres- sion the output signal is derived hzmeg a low-pass filter. This tech- nique ensures reliable triggering on low level signals up to 40 MHz. Adjustment of the vertical amplifier or the calibrator voltage is only possible from within the instrument. Especially with very slow signals the trigger indicator can assist you to adjust the “LEVEL” con- trol, which sometimes needs sensitive adjustment.
Caution In spite of Mumetal-screening of the CRT, hamdg of the earth’s magnetic field on the horizontal trace position cannot be completely avoided. 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.
This is also true with any input signal. The choice of the optimum time coeffi- cient depends on the repetition rate of the signal be- ing measured. A sine-wave signal of OOkHz is applied to the amplifier hame. If an haneg probe XI 0 is used, it should be remembered that a further multiplication by a factor of 10 is required to ascertain the correct voltage value.
In thexl position the cable capacity will act as a load on a high impedance source, however the maximum sensitivity of the oscilloscope can be fully utilized.
It is recommended that the in- strument is switched on for about 1 5 minutes prior to the commencement of any check. 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.
However, in this higher frequency range the vertical display height on the screen is limited to approx. The logical arrangement of the controls and connectors on the front panel ensures that the user will quickly become familiar with the operation of the instrument. Due to the probe capacity it is only recommended for use with relatively low impedance and low frequency sources. If a trace is not visible in either of these modes the overscanning LED’s will indicate the position of the trace.
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Y Overscanning Indication Two light-emitting diodes, located above the vertical input attenuators, show any overscanning of the hwmeg screen haemg in the vertical direction. Technologically it represents the latest state of engineering in this price range. Pay attention to the Overscanning Indication see next paragraph. In the “line” position the mains frequency serves as a trigger signal, this position is particularly useful when signals that are synchronized to the mains are being investigated.
For a better understanding of these Operating Instructions the front panel picture at the end of these instructions can be unfolded for reference alongside the text. To obtain a stably triggered display in these cases, it may be necessary to use the timebase variable control or the sweep delay facility. Conversely, it should be ob- served that sinusoidal voltages indicated in Veff Vrms have 2.
Any reduction of this brightness can only be judged visually. It hameb be noted that the slide switch in the sweep delay section is set to the “norm. The checking and correction of the DC-balance for the amplifiers should be carried out as already described in the Operating Instructions. This can be helpful with complicated or difficult to trigger signals.
When “DC” cou- pling IS selected it is advisable to obtain triggering by using the hamdg control in manual operation, as there is a possibility that in the “AT” position trigger- ing may not be achieved on signals without a zero- axis crossing point DC offset; missing DC-balance. In the “GD” position any signal applied to the vertical inputs is not bameg, therefore preventing damage to the circuit under in- vestigation. Therefore it is recommended to use totally insulated hajeg probe tips when trouble-shooting the instrument.
The display of simple electrical processes such as sinusoidal RF and AF signals or 50Hz ripple voltage poses no problems. In this haameg, the connecting cable is matched directly to the high impedance input of the oscilloscope.
HAMEG hm 412 Oszilloskop Oscilloscope
SI nately tightened turn by turn, otherwise the CRT might be misaligned again. The reference position enables a ground reference level to be set. Input impedance 10 Megohm.
If, for example, the complex bameg signal of a television receiver is to be displayed at frame fre- M7 delay setting of lOnns.