Arbitrary Function; Basics For Arbitrary Signals - Hameg Instruments Hm8131-2 Handbuch

English
The HM8131-2 can produce PSK using sine, square,
triangle, ramp, and arbitrary waveforms. Whenever the
modulation type PSK is active, the menu "PSK" can not
be canceled. Consequently, the desired signal function
must be selected prior to the PSK function. The PSK
modulation must be canceled by pressing the Off-key in
the menu to return to the main menu.
→
←→

Arbitrary Function

Besides the "wired" signals, the HM8131-2 offers the
possibility to generate user-defined waveforms. These
signals can be defined by the user within the limits of the
HM8131-2's specifications. It can be stored in the
HM8131-2 and subsequently be used like a standard
36
signal. The following menu structure shows the available
possibilities.
The arbitrary signals can be generated by the HM8131-2
or transferred to the unit in different ways.
The options are as follows:
• Generated by the front key pad and the built-in the
arbitrary editor
• Generated over the serial interface
• Generated over the optional IEEE-488 interface
• Provided by the HM1007 oscilloscope.
Once the arbitrary signal is generated it can be stored in
the HM8131-2 and recalled the same as a "wired" signal.
For this storage the HM8131-2 has two locations of dif-
ferent length. The first signal of 4K length remains in
memory even when the HM8131-2 is powered down.
The second signal of 16K length is canceled when the
HM8131-2 is powered down. It must be re-generated
for use and stored in the 16K memory. Whenever an
arbitrary signal is defined, it can be recalled over the main
menu like any other signal function. Each one of the
signals, 4k or 16k, can be selected.
During the definition of the arbitrary signal certain rules
and specification limits must be observed as described
in the following sections.

Basics for Arbitrary Signals

The arbitrary signals are defined digitally and are therefore
accurate. The signal form generated can be varied in
frequency and amplitude in the same way as the other
"wired" signals. Besides the boundary conditions that
are defined by the equipment specification it must be
observed that the user defined and digitally generated
waveform has harmonically generated frequencies which
may be above the signal frequency. During the use of such
signals it must be observed that these harmonics may
cause anomalous behavior in the circuits to be tested.
In general, the arbitrary signal is a number of amplitude
Subjest to change without notice