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 ยท 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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Addresses are provided at the back of the manual. All push buttons should be in the “out” position. The display may not shift horizontally during a ahmeg of the trigger coupling from “AC” to “DC” with a sine-wave signal without DC offset.

Compensation range pF. If magnification is used, this product haeg be divided by 5. It should be noted that the probe reduces the input voltage by a factor of Both the BNC and 4 mm signal plug have anti-kink mouldings while the 4 mm earth lead is fine stranded wire, to minimize the risk of the cable breaking. Power consumption; 36 W approx. Therefore, the calibration of the X-signal during X-Y operation is determined by the setting of the Channel II input attenuator and fine control.

In “search” position the delay mode indicator is flashing. The following figure shows correct positioning of the oscilloscope trace for accurate risetime measurement. The following Test Instruc- tions indicate only those tests which can be perform- ed without the use of expensive ancillary in- struments.

I Two hmeg mm binding posts 19 mm between centres. Trig, action; indicated by LED. After this adjustment, a square- wave signal should be displayed and be verified once more in accordance with the Test Instructions.

Oszilloskop HM Equipment HAMEG GmbH, Frankfurt, build

Connection of Test Signal The signal to be displayed should be fed to the ver- tical input of the oscilloscope by means of a screened test cable, e. In the absence of an input signal the baseline will only be displayed if this control is in the fully anti-clockwise position marked “AT” Automatic Triggering. Overscanning; indicated by 2 LED’s. In general, no great changes occur after the in- strument has left the factory, and it is left to the operator’s descretion whether this test is undertaken or not.


Thus, the in- puts to the Y-amplifiers are shorted preventing the in- troduction of unwanted signals. Fifteen minutes after switching on the instrument, set the trace exactly T1 on the horizontal centre line of the graticule. For reliable triggering at high frequencies the bandwidth of the pre- -amplifiers is in the order of 50MHz.

At the same time, the top corner of the pulse must not be round- ed.

If only a dot appears Caution! In this case, the ascertained time values have to be divided by 5. Blanking or modulation of the trace is possible with low level TTL voltages which can be applied to a BNC connector mounted on the rear panel of the instru- ment.

The trigger can be derived from the test signal itself when internal triggering is selected or from a frequency related signal applied to the external trigger input.

Probe Adjustment To achieve the undistorted display of signals when using an XI 0 or XI 00 attenuator probe the probe must be compensated to match the input impedance of the vertical amplifier. The display of simple electrical processes such as sinusoidal RF and AF signals or 50Hz ripple voltage poses no problems. This is achieved by adjusting the trim- mer located in the 2: Trigger and Timebase To achieve a perfectly stable display the correct set- tings of the timebase and trigger controls is most im- portant.

The manual supplied with each instrument covers the operating procedure, circuit diagrams, PCB layouts, test and service instructions are also included. While the adjustment is ac- complished with depressed “Hor.

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With the fine control “xl-xlO”, the nearest edge of the calibration signal can be brought into the screen centre and checked on the criteria T4 41 above-mentioned. In the alternate dual channel mode two non-frequency related signals i.

Oszilloskop HM412-5

However, even ex- perienced operators are advised to read the following instructions thoroughly, as they include important in- formation relating to the use of the HM41 2. However, this work should only be carried out by properly qualified per- sonnel. The Sweep Delay enables a relatively small time interval of a waveform to be expanded and investigated. If tot is greater than 1 00ns, then this can be taken as the risetime of the pulse, and calculation is unnecessary.

If AC coupling has to be used then a separate 1 Megohm resistor will be re- quired to achieve the neccessary DC bias voltage for the diodes.

Please note that the operating voltage of the cathode-ray tube is approx. It is recommended that the in- strument is switched on for about 1 5 minutes prior to the commencement of any check. The indication, however, shows in what direction the trace has left the screen area. If a X 1 0 at- tenuator probe e. Only with such probes is it possible to take signals from the test circuit. The risetime of the signal can be calculated using the following formula. A leather shoulder strap, with a protective pad, is fixed to the case, this is particularly advantageous if other equipment has to be carried.

This unit contains the three-pin power connector. CRT phosphor could be damaged under this conditionprobably the push- button for the “Hor. The LED is located above the timebase switch to the right.

A built-in 1 kHz square -wave generator can be used to check amplifier calibration and probe alignment.

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