Operation Of The Hm8150; Display; Setting Parameters; Waveforms - Hameg HM8150 Handbuch

O p e r a t i o n o f t h e H M 8 1 5 0

Operation of the HM8150

Display

In normal operating mode, that means no parameter is selec-
ted, the display provides information about the frequency in the
left and amplitude settings in the right part of the display. The
frequency display shows 5 digits and has a maximum resolution
of 10 mHz. Amplitude values are displayed with 3 digits and can
be set to a maximum resolution of 1 mV. The displayed ampli-
tude values presuppose that the output is unloaded and must
be divided by 2 to yield the correct value when terminated with
50 . In addition, the displayed values are peak-to-peak
values.
With the offset function activated (OFFSET button
nated), the right part of the display shows the offset voltage.
The displayed values refer to an unloaded output.
After activating the pulse width setting mode (PULSE WIDTH
button is illuminated) , the frequency display shows the pulse
duration. The duration of the positive pulse or – if a negative sign
is stipulated by pressing the INVERT button
pulse is displayed.
In sweep mode the frequency display switches automatically
over to the selected sweep parameter: sweep time (TIME), start
frequency (START) and stop frequency (STOP).

Setting parameters

After selecting the desired waveform by pressing one of the
pushbuttons FUNCTION
set after activation by operating of the corresponding button
with the rotary knob and the two cursor buttons
with the decadic range buttons ÷10
The paramter to be changed is selected by operating the
corresponding button in the PARAMETER fi eld (OFFSET
AMPL , PULSE WIDTH
is illuminated, when the parameter can be changed. By opera-
ting the rotary knob the value of the digit underlined by the
cursor is modifi ed. If the cursor underlines a blank position, it
is considered as 0 and can be changed by turning the rotary
knob to the desired value. The cursor is shifted to another
position with the two cursor buttons
knob increments or decrements the value depending an the
direction the knob is turned.
The range can be changed by using the two range buttons ÷10
and x10 . . The parameter is increased or decreased by
the factor 10. Thereby precise decade shifts can be done. An
unproper value is announced by a warning signal.
When selecting the parameter PULSE WIDTH
is illuminated and the pulse width can be set by operating the
rotary knob and the two cursor buttons
26
Subject to change without notice
is illumi-
– the negative
, the displayed parameters can be
and x10 .
, FREQ or the AMP). The button
. Turning the rotary
, this button
or with the
decadic range buttons ÷10
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
range switches .

Waveforms

varied. The pulse function permits the pulse width to be mo-
difi ed, too. The arbitrary function can be defi ned by the user
(within the the specifi cations of the HM8150).
1. Sine wave
The maximum frequency is 12.5 MHz.
2. Square
The maximum frequency is 12.5 MHz.
The rise and fall time is <10 ns.
3. Triangle
The maximum frequency is 250 kHz. The linearity is better than
1%. The maximum voltage is 20 V
4. 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.
5. Sawtooth
The frequency can be changed in the range of 10 mHz to
25 kHz.The linearity is better than 1%. The maximum output
voltage is 20 V (no load). A positive or negative ramp can be
pp
selected by operating the button INVERT
6. Arbitrary
The maximum signal frequency is 250 kHz at a sampling rate
of 40 MSa/s. The resolution of the user-defi ned signal is 1024
points for the 10 bits resolution and 4096 points for 12 bit reso-
or lution. For more details please refer to paragraph ARBITRARY
FUNCTION.

Operating modes

,
The HM8150 offers different operating modes.In addition to
the standard operating mode "continuous", signals can be
generated in response to a trigger event (triggered) as well
illuminated, the function generator is in continuous mode.
and x10 .
and using the rotary dial
The HM8150 offers six different
waveforms, of which four wa-
veforms have fi xed shapes that
cannot be changed. Only the
frequency and amplitude of the
sawtooth (ramp), triangle, sine
and square wave signals can be
(no load).
pp
.
as in response to a gating signal (gated).
The operating mode can be selected with
the buttons GATED and TRIG'd
luminous button indicates the actual ope-
rating mode. If none of the both buttons is
The following combinations of operating
modes are possible:
With the sweep feature disabled and the
continuous mode activated, the generator
operates at the frequency shown in the
or the decade
. A