User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 66 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
can configure the data recorder flexibly, e.g. select the type of data and the data source.
Furthermore, you can choose the number of record tables and hence influence their size.
For general information regarding the data recording you can send HDR?, which lists available
options, and gives information about additional parameters and commands concerned with data
recording.
How to Define What to Record—Set Record Options
The data recorder configuration, i.e. the assignment of data sources and record options to the
recorder tables, can be read with the DRC? command. The answer gives the values of the
parameters
DRC Data Source
(ID 0x16000700) and
DRC Record Option
(ID 0x16000701). Use the
DRC command or change the parameter values directly in volatile memory. The default setting is
that the current positions of the axes are recorded.
How to Start Recording—Set Trigger Options
Recording can be triggered in several ways. Ask with DRT? for the current trigger option and use
DRT to change it.
INFORMATION
Trigger settings cannot be saved in the nonvolatile memory of the E-727. After the E-727 has been
switched on or rebooted, factory default settings will therefore be active unless a configuration
takes place with a start-up macro.
Irrespective of the DRT settings, data recording is always triggered by the following four
commands:
STE (step response measurement)
IMP (impulse response measurement)
WGO (wave generator start)
WGR (restarts recording when the wave generator is running)
Recording always takes place for all data recorder tables and ends when the data recorder tables
are completely filled.
If digital input lines are used to trigger data recording (configuration with DRT): For reliable
triggering, the pulse width of the input signal has to be at least 2 x the servo update time of the E-
727 system. The servo update time is given in seconds by parameter 0x0E000200.
How to Read Recorded Data
The last recorded data can be read with the DRR? command. The data is reported in GCS array
format. For details regarding GCS array see the separate manual (SM146E), which is provided on
the E-727 CD. Reading out recorded data can take some time, depending on the number of points
to be read! It is possible to read the data while recording is still in progress.
The number of points comprised by the last recording can be read with the DRL? command. This
can be useful, for example, if you restart recording with WGR and want to read data while
recording is still in progress.
How to Configure Number of Tables and Sampling Period
The number of available data recorder tables can be read with the TNR? command. The answer
gives the value of the
Data Recorder Chan Number
parameter, ID 0x16000300. You can change the
parameter value to increase or decrease the number of data recorder tables. For the E-727, the
number of tables must be in the range of 1 to 8.