Waveforms; Operating Modes - Hameg HM8130 Handbuch

O p e r a t i o n o f t h e H M 8 1 3 0
be changed is selected by operating the buttons *
This setting mode is left by pushing the button
for more than 2 seconds.
When selecting the pulse waveform
PULSE , the pulse width can be set by operating the rotary
dial or the decade range switches
If it is additionally desired to superimpose the output signal
with an offset, the value of the offset can be varied by selecting
the OFFSET function and using the rotary dial
decade range switches .

Waveforms

The HM8130 offers 6 different waveforms, of which 4
waveforms have fixed shapes that cannot be changed. Only
the frequency and amplitude of the sawtooth (ramp), triangle,
sine and square wave signals can be varied. The pulse function
permits the pulse width to be modified, too. The arbitrary
function can be defined by the user (within the the specifi-
cations of the HM8130).
Sawtooth
The frequency can be changed in the range of 10 mHz to 500
kHz.The linearity is better than 1%. The max. output voltage is
20 V (no load). A positive or negative ramp can be selected
pp
by operating the button INVERT
Triangle
The max. frequency is 2 MHz. The linearity is better than 1%.
The maximum voltage is 20 V
Sine
The max. frequency is 10 MHz.
Square
The max. frequency is 10 MHz. The rise time is <10 ns.
Pulse
Positive and negative pulses can be generated with a maximum
frequency of 5 MHz. The pulse width can be set between 100
ns and 80 s. The largest settable duty cycle is 80%. The rise
and fall times are the same as given for the square wave signal.
The output amplitude can be set to between -10 V and +10 V.
Arbitrary ARB
The maximum signal frequency is 100 kHz at a sampling rate of
40 MHz. The resolution of the user-defined signal is 1024 points
(10 bits) in x-axis and 4096 points (12 bits) in y-axis. For more
details please refer to paragraph „Arbitrary waveform".

Operating modes

The HM8130 offers different operating modes.In addition to
the standard operating mode "continuous", signals can be
generated in response to a trigger event as well as in response
to a gating signal. The operating mode can be selected with
22
Subject to change without notice
or
* again
and the parameter
.
or the
.
(no load).
pp
.
s w e e p
to be
T h e
modes
W i t h
generator operates at the frequency shown in the display. The
signal is then continually available at the output jack OUTPUT
. In gated mode, the output signal is controlled (modulated)
by a signal applied to the input jack GATE/TRIG.
front panel. This operating mode is asynchronous, i.e. the
output signal can be tapped or interrupted at any point in its
phase. The signal generation begins immediately regardless
of the momentary phase condition. An output signal is always
generated when an applied GATE signal is HIGH (TTL). If the
GATE signal is LOW, no output signal is available.
Figure 3: Output signal controlled by a GATE signal
In triggered mode, the trigger signal is also applied to the
input jack GATE/TRIG.
i.e. an output signal is generated in response to a trigger signal
and starts at the zero crossing. One or more signal periods
are generated, depending on the length of the trigger signal.
This permits generation of bursts, although the number of
the bursts is not programmable.
The trigger mode works with all signal functions within the
indicated frequency ranges, with an upper frequency limit of
500 kHz for sine, square wave and pulse signals. If the duration
of the trigger pulse is shorter than the signal period, only one
signal period is generated. A burst signal ends with the
completion of the signal period, during which the negative
slope of the trigger signal is received.
With the HM8130 bursts can only be generated with the aid of
an external trigger signal. This can be done with the interface
or with an external generator.
If the sweep feature is enabled, sweeps are continuously
performed in continuous mode. The gate function cannot be
used in sweep mode.
pushbutton . The factory setting is
continuous mode. To activate the
feature, the button SWEEP ON
pressed.
following combinations of operating
are possible:
the sweep feature disabled and the
continuous mode activated, the
. This operating mode is synchronous,
is
on the