User manual

34
Signal Generation
10 Signal
Generation
10.1 Function Generator
The R&S®HMO1002 includes an integrated function ge-
nerator which can generate input signals while testing
circuits, for instance. To activate the function generator,
select the UTIL menu in the VERTICAL control panel, and
then press the soft menu key FUNCTION GEN. The fol-
lowing waveforms can be generated and made available at
the AUX OUT connector:
❙ DC
❙ SINE: Frequency range from 0.1 Hz to 50 kHz
❙ SQUARE WAVE: Frequency range from 0.1 Hz to 50 kHz
❙ PULSE: Frequency range from 0.1 Hz to 10 kHz
❙ TRIANGLE: Frequency range from 0.1 Hz to 10 kHz
❙ RAMP: Frequency range from 0.1 Hz to 10 kHz
Use the soft menu key FREQUENCY to select the signal
frequency, and use the soft menu key AMPLITUDE to se-
lect the signal amplitude via universal knob or numerically
via KEYPAD key in the CURSOR/MENU control panel.
You also have the option to select a DC offset (soft menu
key OFFSET). An information box shows a preview of the
respective signal form with the selected parameters.
Use the soft menu key OFF to deactivate the function ge-
nerator and to close the menu.
10.2 Pattern Generator
The pattern generator includes the output of parallel pat-
terns on the four pins S0 to S3 on the front panel of the
instrument. It is based on a 2048 bit wide memory (Sam-
ples) which can be issued cyclically / individually. All sub
functions of the PATTERN GENERATOR are based on this
memory. It is not possible to issue multiple functions simul-
taneously. An information box shows which pins to use.
The pattern generator menu (pattern generator) includes
various options. Use the UTIL menu in the VERTICAL con-
trol panel and press the soft menu key PATTERN GEN. to
open it.
Function Setting options
Square wave Frequency / Period, Polarity, Duty Cycle
Counter Frequency, counting direction
Arbitrary Timing, pattern input
Manual Manual switching of the 4 individual
connectors
UART Polarity, setting the bit rate
SPI / I
2
C / CAN / LIN Setting the bit rate
10.2.1 Square Wave
Use the soft menu SQUARE WAVE to perform a manual
probe compensation without compensation wizard. The
Tab. 10.1: Settings options for the pattern-generator
square wave function uses a 100-sample wide pattern (100
conditions). Additionally, you can change the polarity and
the duty cycle (1% to 99%).
10.2.2 Counter
A 4 bit wide counter pattern is is-
sued. The user can determine the
counting direction (soft menu key
DIRECTION) and the frequency (soft
menu key FREQUENCY). The user
frequency always refers to the swit-
ching of the pattern condition. This
results in square waveforms for individual pins, as descri-
bed in tab. 10.2.
10.2.3 Arbitrary
Theusercandenea4bitwideanda2048sampledeep
pattern via soft menu ARBITRARY. The created patterns
can be stored or recalled. If the arbitrary function is activa-
ted,thepredenedpattern,whichmayhavebeengene-
rated automatically, will be retained. This means that a SPI
pattern can be analyzed and adapted as necessary.
.
The following settings options are available:
❙ PATTERN SETUP:
Use the soft menu key PATTERN LENGTH to determine
the pattern depth. Use the INDEX and the universal knob
or the KEYPAD key in the CURSOR/MENU control panel
to select individual samples. The selected sample will be
shown in the information box as a light blue line. To select
a sample, also use the universal knob or the KEYPAD key.
Thepatternowforall4bitswillbeshowninthe
window. Around the index, ±8 bits will be displayed. Use
the soft menu key VALUE to change the value of the
selected sample. Use the soft menu key DRAW to draw
large sample amounts with the same value. The VALUE
setting remains unchanged and is applied to all selected
indices. If the pattern is deleted (soft menu key DELETE
ALL), its length will be reset to 1. All connectors will be
set to ‚0‘.
❙ TIMING SETUP:
Use the soft menu key BIT TIME to set the time at which
Fig. 10.1: Arbitrary menu
Pin Frequency
S0 f/2
S1 f/4
S2 f/8
S3 f/16
Tab. 10.2: Counter