Hameg HM1008 Manual Download Page 34

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Subject to change without notice

See the hints in 18.2 regarding period (trigger period) or fre-
quency (trigger frequency) measurements.

For voltage measurements the result will be calculated from
the displayed signal data and the signal data selected with
”Respect“.

STOP

Please

note:

Complex signals should be measured with CURSOR.

18.3.1

Auto On Off

If Auto is On the readout will display the result of the automatic
measurement in the top right corner. (e.g. DC(CH2):100μV).
(CHx) denotes the source channel, (Tr) the trigger signal.
Sometimes a ”?“ may be displayed, if there is no signal or an
insufﬁ cient one.

If a variable is activated and the sensitivity or time base thus
uncalibrated the ”:“ will be replaced by a ”

“ symbol.

18.3.2

Meas. Type (measurement type)

If this function is activated the mode can be selected with the
INTENS knob

, the display in the ”Respect“ ﬁ eld will change

accordingly.

In one channel only mode the active channel will be indicated.
In those modes where 2 channels are activated the INTENS
knob symbol

will be shown. After pressing the ”Reference“

pushbutton the reference channel may be selected with the
INTENS knob

18.3.3

Respect

Tr indicates that the measurement is done with respect to the
trigger signal. If e.g. the CH1 signal is used for triggering, the
result will be with respect to that signal.

In case of voltage measurement is done with respect to the
active channel. In those modes where several channels are
activated, the INTENS knob symbol

indicates that different

channels can be selected.

LEVEL A/B knob

The LEVEL control allows to set the trigger level, i.e. the voltage
resp. signal level, which will generate a trigger to start the time
base whenever the signal passes that level. In most Yt modes
the readout will show a symbol the vertical position of which
indicates the signal point which will trigger. The trigger symbol
will be ”parked“ on the second graticule line from the bottom

C o n t r o l s a n d R e a d o u t

in those modes where there is no direct relationship between
trigger signal and trigger point.

In normal trigger mode the LEVEL control will move the trig-
ger symbol anywhere. In automatic peak-to-peak detection
mode the level can only be selected between the signal’s peak
values.

The movement of the trigger symbol is vertical only. The range
of this symbol is limited in order to prevent that this symbol will
overwrite other readout information. As soon as the trigger sym-
bol leaves the graticule its form will change, this change signals
in which direction the trigger symbol left the graticule.

Analog mode only:

Depending on the time base mode the LEVEL

control will affect the time base A or B triggering. Press the
HOR pushbutton

in order to select the time base mode in

the ”Time base“ menu. In ”Search“ mode (alternate time base
mode) the last trigger level setting for time base A will remain
valid (graticule left) if time base B is switched to triggered
mode. (Menu ”Time base“: set B trigger to positive or negative
slope). Thereafter the LEVEL A/B control will control the time
base B trigger, a second trigger point symbol will be shown
and marked with ”B“.

MODE pushbutton

Pressing this pushbutton will open the ”Trigger“ menu, where
Auto, Normal, Single (sweep triggering) can be selected. Choo-
sing ”Slope“ will allow to trigger on any signal shape. For video
signals select ”Video“ and press the FILTER pushbutton

order to ﬁ nd a choice of special trigger modes for composite
video signals.

In XY mode the pushbuttons MODE

, FILTER

and SOURCE

are disabled as there is no triggering in XY mode.

20.1 Auto (trigger)

Automatic triggering (Auto) is active if the NORM display

not illuminated. In ”Auto“ the analog time base resp. signal
capture (DSO mode) will be periodically started even if there is
no signal or when no triggers are generated because the set-
tings are incorrect. Signals of

20 Hz can not be triggered as

the automatic start will have occurred before the signal arrived.
Automatic triggering is possible with or without peak detection.
The LEVEL A/B

control will be active in both modes.

In peak detection mode the range of the level control is limited
to the peak-to-peak voltage of the signal. Without peak detection

VOLTS / DIV

SCALE

VAR

VOLTS / DIV

SCALE

VAR

TIME / DIV

SCALE