3629.6776.04 Rohde & Schwarz HMP series manual

Loading ...

Advanced Operating Functions

5.3.4 Arbitrary

Activate the menu ARBITRARY by pressing the knob. The

HMP series allows you to generate freely programmable

waveforms which can be reproduced within the limits set

by the instrument for voltage and current for the respec-

tive channel. The arbitrary function can be congured and

executed via control panel or external interface.

For all practical purposes, each HMP channel has its

own arbitrary memory. This means that rst an arbitrary

waveform is generated, then it is transmitted to the rst

channel (followed by the second, third, etc. channel) and

nally, the arbitrary waveform of the respective channel is

started. In other words, a waveform is generated for chan-

nel 1, then for channel 2 etc. (including a delay of approxi-

mately 100 ms at the start). Nevertheless, it is very difcult

to implement a simultaneous start/end phase for multiple

waveforms as a certain delay always occurs between

these waveforms. This hampers calculations as these de-

lays are dependent on the execution of remote commands,

the transfer between the interface and the instrument as

well as the process software. Therefore, it is impossible to

synchronize all arbitrary waveforms. The arbitrary function

was developed for individual channels and is not intended

to function comprehensively across all channels. Nonethe-

less, the individual arbitrary waveforms should only slightly

deviate from each other.

Use the menu item EDIT WAVEFORM to edit the param-

eters for the freely programmable waveform. The base

data for voltage, current and time (duration per point) are

required for this purpose. The appropriate base data allow

you to generate any of the common waveforms (step func-

tion, saw tooth, sine, etc.).

It is possible to repeat 128 specied points (index of

0...128). The repetition rate is at a maximum of 255 repeti-

tions. If the repetition rate (Repetitions) is set to “000“, the

arbitrary function will be repeated innitely. Use the knob

to set the values and press it to conrm your selections

(alternatively, you can use the right arrow key to conrm).

Use TRANSFER WAVEFORM to transfer the set data to

the selected channel and select Start Waveform and press

the OUTPUT key to create the set data at the respective

output. The display indicates that the values set in EDIT

WAVEFORM are repeated. Use STOP WAVEFORM to end

Fig. 5.5:

Arbitrary

settings

(R&S®HMP2030)

A signal with three specied points can only be issued by an AD

converter as a staircase curve. To issue it as a sawtooth signal,

additional specied points are required.

To display complex voltage sequences through the available 128

specied points and the minimum delay of 10ms, the R&S®HMP

is suitable to only a limited extent.

the arbitrary function. Pressing the OUTPUT key deacti-

vates only the respective channel and does not stop the

function. This means that the arbitrary waveform contin-

ues internally. The option CLEAR WAVEFORM allows you

to delete any previously made settings.

Use SAVE WAVEFORM to save up to 3 settings (wave-

forms) which can be recalled by using the RECALL WAVE-

FORM option. To conrm the respective memory, press

the knob. To load the memory, apply the same steps. Use

the left arrow key to return to the previous menu level.

Example of an Arbitrary Signal (R&S®HMP2030):

Alternatively, you can also use the EasyArb software

module of the HMExplorer software to create an arbitrary

le. This allows you to create each point of a waveform by

use of the editor. You can add or delete individual points by

using the “+“ or “–“ function.

Once all arbitrary points have been created, the created

signal can be transferred to the instrument via interface by

using the menu item TRANSFER. The menu TRANSFER

opens and allows you to select the respective R&S®HMP

channel and the repetitions. Additionally, you can activate

the output to issue the signal at the output and to view it

on an oscilloscope, for instance (see g. 5.8).

For more information about the EasyArb software module,

please refer to the HMExplorer software manual which can

be found in the software ZIP le as PDF document.

With rmware version 2.12 and higher, the output level remains

at the most recently selected value on the arbitrary signal!

Fig. 5.6: Arbitrary-Editor

example (excerpt) HMExplorer

Software

Fig. 5.7: Output arbitrary example on an oscilloscope

Loading ...

Rohde & Schwarz HMP series manual - Page 38