Hameg HM 1004-3 Series Manual Download Page 11

11

Subject to change without notice

Controls and Readout

visible if the correct termination is not used. A terminating
resistance is sometimes recommended with sine signals as
well. Certain amplifiers, generators or their attenuators main-
tain the nominal output voltage independent of frequency only
if their connection cable is terminated with the prescribed
resistance. Here it must be noted that the terminating resistor

HZ22 

will only dissipate a maximum of 2Watts. This power is

reached with 10Vrms or  at 28.3Vpp with sine signal. If a x10

or x100 attenuator probe is used, no termination is necessary.
In this case, the connecting cable is matched directly to the high
impedance input of the oscilloscope. When using attenuators
probes, even high internal impedance sources are only slightly
loaded (approx. 10M

 II 12pF or 100M

 II 5pF with

 HZ53

).

Therefore, if the voltage loss due to the attenuation of the
probe can be compensated by a higher amplitude setting, the
probe should always be used. The series impedance of the
probe provides a certain amount of protection for the input of
the vertical amplifier. Because of their separate manufacture,
all attenuator probes are only partially compensated, therefore
accurate compensation must be performed on the oscillo-
scope (see Probe compensation ).

Standard attenuator probes on the oscilloscope normally
reduce its bandwidth and increase the rise time. In all cases
where the oscilloscope bandwidth must be fully utilized (e.g.
for pulses with steep edges) we strongly advise using the
probes

 HZ51 

(x10)

 HZ52 

(x10 HF) and

 HZ54  

(x1 and x10). This

can save the purchase of an oscilloscope with larger band-
width.

The probes mentioned have a HF-calibration in addition to low
frequency calibration adjustment. Thus a group delay correc-
tion to the upper limit frequency of the oscilloscope is possible
with the aid of an 1MHz calibrator, e.g.

 HZ60

.

In fact the bandwidth and rise time of the oscilloscope are not
noticably changed with these probe types and the waveform
reproduction fidelity can even be improved because the probe
can be matched to the oscilloscopes individual pulse re-
sponse.

If a x10 or x100 attenuator probe is used, DC input
coupling must always be used at voltages above 400V.
With AC coupling of low frequency signals, the atte-
nuation is no longer independent of frequency, pulses
can show pulse tilts. Direct voltages are suppressed
but load the oscilloscope input coupling capacitor
concerned. Its voltage rating is max. 400 V (DC + peak
AC). DC input coupling is therefore of quite special
importance with a x100 attenuation probe which usu-
ally has a voltage rating of max. 1200 V (DC + peak AC).
A capacitor of corresponding capacitance and voltage
rating may be connected in series with the attenuator
probe input for blocking DC voltage (e.g. for hum
voltage measurement).

With all attenuator probes, 

the maximum AC input voltage

must be derated with frequency usually above 20kHz. There-
fore the derating curve of the attenuator probe type con-
cerned must be taken into account.

The selection of the ground point on the test object is
important when displaying small signal voltages. It should
always be as close as possible to the measuring point. If this
is not done, serious signal distortion may result from spurious
currents through the ground leads or chassis parts. The
ground leads on attenuator probes are also particularly critical.
They should be as short and thick as possible. When the
attenuator probe is connected to a BNC-socket, a BNC-

adapter, should be used. In this way ground and matching
problems are eliminated. Hum or interference appearing in
the measuring circuit (especially when a small deflection
coefficient is used) is possibly caused by multiple grounding
because equalizing currents can flow in the shielding of the
test cables (voltage drop between the protective conductor
connections, caused by external equipment connected to the
mains/line, e.g. signal generators with interference protec-
tion capacitors).

Controls and Readout

The following description assumes that the instru-
ment is not set to “COMPONENT TESTER” mode.

If the instrument is switched on, all important settings are
displayed in the readout. The LED´s located on the front panel
assist operation and indicate additional information. Incorrect
operation and the electrical end positions of control knobs are
indicated by a warning beep.

Except for the power pushbutton

 (POWER)

, the calibrator

frequency pushbutton

 (CAL. 1kHz/1MHz)

, the focus control

(FOCUS) 

and the trace rotation control

 (TR) 

all other controls

are electronically selected. All other functions and their set-
tings can therefore be remote controlled and stored.

The front panel is subdivided into sections.

On the top, immediately to the right of the CRT screen,
the following controls and LED indicators are placed:

(1) POWER 

- Pushbutton and symbols for

 ON (I) 

and

 OFF

(O)

.

After the oscilloscope is switched on, all LEDs are lit and
an automated instrument test is performed. During this
time the

 HAMEG 

logo and the software version are

displayed on the screen. After the internal test is com-
pleted succesfully, the overlay is switched off and the
normal operation mode is present. Then the last used
settings become activated and one LED indicates the ON
condition.

Some mode functions can be modified

 (SETUP) 

and/or

automated adjustment procedures (CALIBRATE) can be
called if the

  “MAIN MENU” 

is present.

 For further

information please note “MENU”

.

(2) AUTO SET 

-

Briefly depressing this pushbutton (

please note “AUTO

SET”

) automatically selects Yt mode. The instrument is

set to the last used Yt mode setting (CH I, CH II or DUAL).
Even if alternating timebase mode or B timebase mode
was active before, the instrument is switched automati-
cally to A timebase mode.

 Please note “AUTO SET”

.

Automatic CURSOR supported voltage measurement
If CURSOR voltage measurement is present, the CUR-
SOR lines are automatically set to the positive and
negative peak value of the signal. The accuracy of this
function decreases with higher frequencies and is also
influenced by the signal‘s pulse duty factor.

Summary of Contents for HM 1004-3 Series

Page 1: ...Instruments Oscilloscope HM 1004 3 01 02 03 ENGLISH MANUAL HANDBUCH MANUEL...

Page 2: ...MANUAL HANDBUCH MANUEL...

Page 3: ...res 23 Phase difference measurement in DUAL mode Yt 24 Phase difference measurement in DUAL mode 24 Measurement of amplitude modulation 24 Triggering and timebase 25 Automatic Peak value Triggering 25...

Page 4: ...ollowing hints and conditions regarding emission and immunity should be observed 1 Data cables For the connection between instruments resp their interfaces and external devices computer printer etc su...

Page 5: ...x ambient temperature 0 C 40 C Protective system Safety class I IEC1010 1 Weight approx 5 9kg Color techno brown Cabinet W 285 H 125 D 380 mm Subject to change without notice 08 00 This microprocessor...

Page 6: ...f an extension cord without a protective conductor The mains line plug must be inserted before connec tions are made to measuring circuits The grounded accessible metal parts case sockets jacks and th...

Page 7: ...helps towards speeding up the processing of guarantee claims Maintenance Various important properties of the oscilloscope should be carefully checked at certain intervals Only in this way is it largel...

Page 8: ...it a true signal display The display of sinusoidal signals within the bandwidth limits causes no prob lems but an increasing error in measurement due to gain reduction must be taken into account when...

Page 9: ...caus ing damage to the input of the oscilloscope However if for example only the residual ripple of a high voltage is to be displayed on the oscilloscope a normal x10 probe is sufficient In this case...

Page 10: ...asurement of the rise or fall time is not limited to the trace dimensions shown in the above diagram It is only particularly simple in this way In principle it is possible to measure in any display po...

Page 11: ...Hz There fore the derating curve of the attenuator probe type con cerned must be taken into account The selection of the ground point on the test object is important when displaying small signal volta...

Page 12: ...iver please note trace rotation TR 6 FOCUS This control knob effects both the trace and the readout sharpness 7 SAVE RECALL The instrument contains 9 non volatile memories These can be used by the ope...

Page 13: ...with this control knob In ADD addition mode both Y POS I and Y POS II control knobs are active If the instrument is set to XY mode this control knob is inactive and the X POS knob must be used for a h...

Page 14: ...aid of the X POS control As the X expansion results in a higher timebase speed lower time deflection coefficient all time and frequency relevant information in the readout is switched over Please note...

Page 15: ...hannel II followed by XY Except the cursor lines which may be active all other readout information including the trigger point symbol are switched off In addition to all trigger and timebase related c...

Page 16: ...l switched off NR high frequency noise rejected LF low pass filter cuts off frequencies above approx 1 5kHz TVL TV signal line pulse triggering trigger point symbol switched off TVF TV signal frame pu...

Page 17: ...e TIME DIV 24 control knob is operative only for this timebase The readout then only displays the A time coefficient The timebase settings for this condition are stored if the timebase mode is changed...

Page 18: ...switch and B vernier VAR LED on In the latter case the TIME DIV knob can be used in the same way as de scribed before under A timebase condition Underneath the front panel sector described above the...

Page 19: ...r related con trols assumes that the readout is visible and the component tester is switched off 35 MENU Pushbutton Pressing and holding the pushbutton activates the display of the MAIN MENU It contai...

Page 20: ...as one signal sum or difference As the result can only be determined if both calibrated deflection coefficients are equal the CHI II 36 selection function is deactivated In that case the readout indic...

Page 21: ...ted to the oscilloscope input s Check that the device under test is switched off and connect the test lead s to the test point s Then switch on the instrument and afterwards the device under test The...

Page 22: ...rm distortion Prerequisite for this HF compensation is a square wave generator with fast risetime typically 4ns and low output impedance approx 50 providing 0 2V at a frequency of approx 1MHz The cali...

Page 23: ...this operation mode is the DUAL XY 18 pushbutton please note section Con trols and Readout In XY mode the timebase is deactivated The signal applied to the input of channel II front panel marking HOR...

Page 24: ...ng for one period in div In the example illustrated t 3div and T 10div The phase difference in degrees is calculated from Relatively small phase angles at lower frequencies can be measured more accura...

Page 25: ...ode for the entry into difficult measuring problems e g when the test signal is unknown relating to amplitude frequency or shape Presetting of all parameters is now possible with automatic triggering...

Page 26: ...5div height The polarity of the synchronization pulse is critical for the slope selection If the displayed sync pulses are above the picture field contents leading edge positive going then the slope...

Page 27: ...vated As the external trigger signal applied at the TRIG EXT socket normally has no relation to the signal height of the displayed signal the trigger point symbol is switched off The external trigger...

Page 28: ...nt This allows the sweep to begin on any portion of a signal except the first millimeters If the display shows jitter it is possible to select triggering of the B timebase after the elapsed delay time...

Page 29: ...lugs and with test prod alligator clip or sprung hook are required The test leads are connected as described in section Con trols and Readout Test Procedure Caution Do not test any component in live c...

Page 30: ...r a transistor the figures b e and b c are important The figure e c can vary but a vertical line only shows short circuit condition These transistor test patterns are valid in most cases but there are...

Page 31: ...devices In case of disregard of the safety warnings contained in this manual HAMEG refuses any liability regarding personal injury and or damage of equip ment Operation The oscilloscope is supplied w...

Page 32: ...Subject to change without notice 32 Front Panel HM1004 3...

Page 33: ...33 Subject to change without notice...

Page 34: ...Subject to change without notice 34...

Page 35: ...MANUAL HANDBUCH MANUEL...

Page 36: ...uk Spain HAMEG S L Villarroel 172 174 08036 BARCELONA Tel f 93 4301597 Telefax 93 321220 E mail email hameg es France HAMEG S a r l 5 9 av de la R publique 94800 VILLEJUIF T l 1 4677 8151 Telefax 1 4...

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