Hameg HM 303-4 Manual
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Hameg HM 303-4 Manual

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Oscilloscope datasheet
Symbols ............................................................
General Information ...........................................
Use of tilt handle ...............................................
Safety ................................................................
Operating conditions .........................................
Warranty ............................................................
Maintenance .....................................................
Protective Switch-Off ........................................
Power supply ....................................................
Type of signal voltage ........................................
Amplitude Measurements .................................
Time Measurements .........................................
Connection of Test Signal .................................
First Time Operation ..........................................
Trace Rotation TR ..............................................
Probe compensation and use ............................
X-Y Operation ....................................................
in DUAL mode ............................................
Triggering and Timebase ...................................
Automatic Triggering .........................................
Normal Triggering, Slope ...................................
Trigger Coupling ................................................
Triggering of Video Signals ................................
Line Triggering ...................................................
Alternate Triggering ...........................................
External Triggering ............................................
Trigger Indicator ................................................
Y Overscanning Operation ................................
Component Tester ............................................
Test Patterns .....................................................
General ..............................................................
Astigmatism Check ...........................................
of the Vertical Amplifier .................................
Subject to change without notice
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Oscilloscope
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GB
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Operating Modes:CHI/II-TRIG.I/II, DUAL, ADD,
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Triggering Checks ..............................................
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Timebase ...........................................................
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Component Tester ............................................
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Trace Alignment ................................................
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General ..............................................................
22
Instrument Case Removal .................................
Operating Voltages ............................................
23
Astigmatism control ..........................................
Trigger Threshold ..............................................
23
Trouble-Shooting the Instrument .......................
23
23
Adjustments ......................................................
23
Short Instruction . ...............................................
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Table of contents

HM 303
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Summary of Contents for Hameg HM 303-4

  • Page 1: Table Of Contents

    Table of contents Oscilloscope datasheet Operating Instructions Symbols ............General Information ........... Use of tilt handle ..........Safety ..............Operating conditions ......... Warranty ............Oscilloscope Maintenance ............. Protective Switch-Off ........HM 303 Power supply ............ Type of signal voltage ........Amplitude Measurements .........
  • Page 2 HAMEG instruments fulfill the regulations of the EMC directive. The conformity test made by HAMEG is based on the actual generic- and product standards. In cases where different limit values are applicable, HAMEG applies the severer standard. For emission the limits for residential, commercial and light industry are applied.
  • Page 3 5, av de la République F - 94800 Villejuif Die HAMEG GmbH / HAMEG S.a.r.l bescheinigt die Konformität für das Produkt The HAMEG GmbH / HAMEG S.a.r.l herewith declares conformity of the product HAMEG GmbH / HAMEG S.a.r.l déclare la conformite du produit...
  • Page 4 The bandwidth has been extended from 20 to 30MHz, the sweep Horizontal Deflection rate increased to 10ns/div. and improvements added to the already legendary HAMEG auto triggering system. The HM303 is the ideal instrument for waveform Time coefficients: 20 calibrated steps display in the DC to 70MHz frequency range.
  • Page 5 OSCILLOSCOPES HZ 56 AC/DC Current Probe Utilising Hall Effect technology to provide a broad frequency response, the probe will accurately measure AC, DC and complex waveforms. The compact clip-on design conforms to the IEC1010 safety standard and allows non- intrusive measurement of current from 5mA to 30A peak to an accuracy of ±1%.

  • Page 6: Operating Instructions Symbols

    Operating Instructions Symbols Safety See user's manual This instrument has been designed and tested in accor- Danger high voltage dance with IEC Publication 348, Safety Requirements Earth for Electronic Measuring Apparatu s. The CENELEC HD401 regulations correspond to this standard. It has left General Information the factory in a safe condition.

  • Page 7: Operating Conditions

    The power Warranty input fuses are externally accessible. The fuseholder is HAMEG warrants to its Customers that the products it located above the 3-pole power connector. The power manufactures and sells will be free from defects in materials input fuses are externally accessible, if the rubber conector and workmaship for a period of 2 years .

  • Page 8: Type Of Signal Voltage

    Type of signal voltage difference in V . The relationship between the different voltage magnitudes can be seen from the following figure. With the HM 303, most repetitive signals in the frequency range up to at least 30MHz (−3dB) can be examined. Sinewave signals of 50MHz are displayed with a height of approx.

  • Page 9: Time Measurements

    = time coefficient in s/div. on timebase switch and the relation F = 1/T, the following equations can be stated: With the above listed exceptions HAMEG 10:1 probes can T = L · T be used for DC measurements up to 600V or AC voltages (with a mean value of zero volt) of 1200V .

  • Page 10: Connection Of Test Signal

    Examples: Displayed wavelength L = 7div., set time coefficient T = 0.1µs/div., −6 required period T = 7x0.1x10 = 0.7µs −6 required rec. freq. F = 1:(0.7x10 ) = 1.428MHz. Signal period T = 1s, set time coefficient T = 0.2s/div., required wavelength L = 1:0.2 = 5div..
  • Page 11 If, after applying the signal, the trace is nearly from HAMEG and replaced by oneself. The probes blanked, the period of the signal is probably substantially mentioned have a HF-calibration in addition to low longer than the set value on the TIME/DIV.

  • Page 12: First Time Operation

    First Time Operation However, in this higher frequency range the vertical display height on the screen is limited to approx. 4-5div. Before applying power to the oscilloscope it is recom- The time resolution poses no problem. For example, with mended that the following simple procedures are 50MHz and the fastest adjustable sweep rate (10ns/div.), performed: one cycle will be displayed every 2div.
  • Page 13 One output provides 0.2V ±1% (t <4ns) for 10:1 probes, Only this compensative adjustment ensures optimum and the other 2V ±1% for 100:1 probes. When the utilisation of the full bandwidth, together with constant attenuator switches are set to 5mV/div vertical deflection group delay at the high frequency end, thereby reducing coefficient, these calibration voltages correspond to a characteristic transient distortion near the leading edge...

  • Page 14: Operating Modes Of The Y Amplifier

    Operating modes of the vertical amplifiers After completion of the HF-adjustment, the signal amplitude displayed on the CRT screen should have the same value as during the 1kHz adjustment. The vertical amplifier is set to the desired operating mode by using the 3 pushbuttons (CH I/II, DUAL and ADD) in the Y field of the front panel.

  • Page 15: X-Y Operation

    X-Y Operation The following must be noted here: − Because of the periodic nature of the trigonometric For X-Y operation , the pushbutton in the X field marked XY must be depressed. The X signal is then derived from functions, the calculation should be limited to angles ≤90°.

  • Page 16: Measurement Of An Amplitude Modulation

    Phase difference measurement in DUAL mode button depressed) using a suitable LEVEL setting and t = horizontal spacing of the zero transitions in div. possibly also using the time variable adjustment. T = horizontal spacing for one period in div. Oscilloscope setting for a signal according to figure 2: Depress no buttons.

  • Page 17: Automatic Triggering

    The internal trigger threshold of the HM303 is given as triggering mode, the same applies to approx. 0.3V external ≤.5div. When the trigger voltage is externally supplied, it trigger voltage amplitude. can be measured in V at the TRIG. INP. socket. Normally, the trigger threshold may be exceeded up to a maximum Other measures for triggering of very complex signals are factor of 20.

  • Page 18: Line Triggering

    The slope of the leading edge of the synchronization pulse ve portion of the line sinewave. The LEVEL control is used for is critical for the SLOPE pushbutton setting. If the displayed trigger point adjustment in case of normal triggering (AT/ sync pulses are above the picture (field) contents, then NORM.

  • Page 19: Component Tester

    Y Overscanning Indication Thus for fast signals the LED appears to glow continuously, for low repetition rate signals, the LED flashes at the This indicator shows any vertical overscan of the usable repetition rate or at a display of several signal periods not (10 x 8) screen area, if any part of the signal or baseline are only at the start of the sweep at the left screen edge, but outside the graticule.
  • Page 20 indicating range of the component tester is limited. The will move towards the vertical axis. Values of resistance from 20 Ω Ω Ω Ω Ω to 4.7k Ω Ω Ω Ω Ω can be approxi- impedance of the component under test is limited to a range from 20Ω...
  • Page 21 experience is most frequently needed. These transistor test patterns are valid in most cases, Testing Diodes but there are exceptions to the rule (e.g. Darlington, Diodes normally show at least their knee in the forward FETs). With the COMP. TESTER, the distinction characteristic.

  • Page 22: Test Patterns

    Test patterns Single Components Single Transistors Resistor 510Ω Ω Ω Ω Ω Short circuit Junction B-C Junction B-E Mains transformer prim. Capacitor 33µF Junction E-C Single Diodes In-circuit Semiconductors Diode paralleled by 680Ω Ω Ω Ω Ω Z-diode below 7V Z-diode beyond 7V 2 Diodes antiparallel Diode in series with 51Ω...

  • Page 23: Test Instructions

    (see CRT data book). These limit values are strictly These Test Instructions are intended as an aid for checking supervised by HAMEG. The selection of a cathode-ray the most important characteristics of the HM303 at tube without any tolerances is practically impossible.

  • Page 24: Transmission Performance Of The Vertical Amplifier

    A suited generator for this test is HZ60 from HAMEG. It is important to note that in the I+II add mode (only ADD depressed) or the I–II difference mode (INVERT CHII...

  • Page 25: Triggering Checks

    Triggering Checks If both vertical inputs are AC coupled to the same signal and both traces are brought to coincide exactly on the screen, when working in the alternate dual channel The internal trigger threshold is important as it determines the display height from which a signal will be stably mode , then no change in display should be noticeable, displayed.

  • Page 26: Component Tester

    Component Tester s/div. − 0.1 ms/div. − 10kHz s/div. − 50 µs/div. − 20kHz After pressing the COMP. TESTER button, a horizontal 50 ms/div. − 20 µs/div. − 50kHz straight line has to appear immediately, when the COMP. 20 ms/div. − 10 µs/div.

  • Page 27: Service Instructions

    For any further technical information it undergo local superheating (e.g. by soldering iron) call or write to HAMEG. Addresses are provided at the or local undercooling (e.g. by cryogenic-spray). We back of the manual. It is recommended to use only the...

  • Page 28: Trigger Threshold

    Replacement parts can be ordered by thoroughly after removal of the case. Look for loose or letter or telephone from the nearest HAMEG Service badly contacted or discolored components (caused by Office. Please supply the following information: Instru- overheating).

  • Page 29: Short Instruction

    Short Instruction for HM303 Switching on and initial setting Connect instrument to power outlet, depress red POWER button. LED indicates operating condition. Case, chassis and all measuring terminals are connected to the safety earth conductor (Safety Class Do not depress any further button. TRIG. selector switch to AC. AT/NORM.

  • Page 30: Front Panel Elements, Front View

    Front Panel Elements HM 303 (Brief Description - Front View) Element Function Element Function POWER Turns scope on and off. . C OMP. TESTER Switch to convert oscilloscope (pushbutton switch) to component tester mode. (pushbutton + LED) LED indicates operating condition. INTENS.
  • Page 31 Ω Ω...

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