Hameg HM304 Manual
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29Subject to change without noticeShort instruction for HM304Switching on and initial settingCase, chassis and all measuring terminals are connected to the safety earth conductor (Safety Class I).Connect instrument to power outlet, depress red POWER button. LED‘s indicating operating condition.Instrument is set as it was before switching off.Adjust trace intensity for medium brightness.If no trace is visible, depress AUTO SET to switch to Yt mode.Focus trace using FOCUS.Vertical amplifier modeChannel I: If no LED lit on the CH I VOLTS/DIV scale, depress pushbutton CH I. If a LED on the CH IIVOLTS/DIV. is lit too, depress pushbutton CH II to switch it off.Channel II: If no LED lit on the CH II VOLTS/DIV scale, depress pushbutton CH II. If a LED on the CH IVOLTS/DIV. is lit too, depress pushbutton CH I to switch it off.DUAL (channel I and channel II): Depress the CH I or CH II pushbutton so that a LED is lit on both channel I andII VOLT/DIV scales.Addition (ADD): Depress both CH I and CH II pushbuttons simultaneously until the ADD LED lights.Addition (sum): With both input signals in phase switch both INV LED‘s on or both off.Addition (difference): With both input signals in phase switch only one INV LED on.Addition mode can be exited by depressing both CH I and CH II pushbuttons simultaneously until the ADD LED is dark.Triggering modeSelect trigger mode by depressing both NORM pushbuttons simultaneously:NM LED dark = automatic peak (value) triggering < 20 Hz - 100 MHz. TRIG. LEVEL active.NM LED lit = normal triggering. TRIG. LEVEL active.Trigger edge direction: select with ± pushbutton. - LED lit = falling slope, dark = rising slope.Internal triggering: In CH I and CH II mode automatically set and indicated by TR I and TR II LED‘s.In DUAL and ADD mode briefly depress the TRIG. pushbutton for switching over.Internal alternate triggering: IN DUAL mode depress and hold the TRIG. pushbutton until both TR I and TR II are lit.Switch off this mode by briefly depressing the TRIG. pushbutton.External triggering: Depress the EXT pushbutton next to the TRIG. INP. BNC socket to light the EXT LED.Trigger Signal 0.3Vpp - 3Vpp at TRIG. INP. Return to internal triggering by depressing the EXT. pushbutton again (EXT LED dark).Line triggering: Select the ~ symbol on the trigger coupling scale depressing one of the NORM pushbuttons (up / down).Trigger coupling: Choose AC/DC/HF/LF/TV-L/TV-F by depressing one of the NORM pushbuttons.Frequency ranges: AC 10Hz - 100MHz; DC 0Hz - 100MHz; HF 1.5kHz - 100MHz; LF 0Hz - 1.5 kHz.TV-L to trigger on line sync. pulses; TV-F to trigger on separated frame sync. pulses. Select ± (SLOPE) for theleading slope. Sync pulse above picture content = + ( - LED dark ), below = - ( - LED lit ).Pay attention to trigger indicator: LED above TRIG.MeasurementsApply test signal(s) to the vertical input connectors of CH I and/or CH II.Before use, compensate attenuator probe with built-in square wave generator CAL.Depress AUTO SET for automatic instrument set up or:Select AC or DC (LED lit) input coupling (GD LED dark).Adjust signal to desired display height with < > arrow pushbutton(s) in VOLTS/DIV. sector.Amplitude measurement with Y fine control (VAR. 2.5:1) at right stop.Adjust signal to desired number of displayed periods with < > arrow pushbutton(s) in TIME/DIV. sector.Time measurement with time fine control (VAR. 2.5:1) at right stop.Time expansion with x10 LED lit.Set trigger point with TRIG. LEVEL knob in automatic peak (value) and normal (NM LED lit) triggering.Select automatic peak (value) or normal triggering by depressing both NORM pushbuttons simultaneously.Improve complex or aperiodic signal stability with longer HOLD OFF-time or in DELAY mode (DEL or DTR).For the expansion of signal portions, use delay (DEL) or after delay trigger mode (DTR) with reducedtime coefficient (TIME/DIV).Normal undelayed mode = no DELAY LED (SEA/DEL/DTR) lights.Depress DELAY pushbutton once (SEA - search - LED lights) and adjust the timebase start position usingDEL. POS. knob and TIME/DIV < > pushbutton(s).Brief depress DELAY pushbutton to switch over to delay mode (DEL lights). Now the timebase starts (DEL lit)with the selected start point and the trace length has full length. For start point and expansion rate corrections useDEL. POS. and TIME/DIV settings.Depressing the DELAY pushbutton once again switches over to triggered delay mode (DTR lights) andautomatically to DC trigger coupling (DC LED on TRIG scale lights) and normal triggering (NM LED lights).± (SLOPE) and TRIG. LEVEL are active and set in their priviously used settings.Depress the DELAY pushbutton again to switch to normal mode. Then all LED‘s on the DELAY scale are dark.SEA and DEL can be exited without stepping through the modes by depressing and holding the DELAYpushbutton until all LED‘s are dark.Component tester modeDepress COMP. TESTER pushbutton.COMP. TESTER mode is active if all LED‘s are dark (exception X MAG. x10).In-circuit-test: Circuit under test must be disconnected from battery or power (pull out power plug), signals andground (earth). Remove all signal connections to the instrument (cable, probe), then start testing. |
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