Hameg Instruments HM8142 Handbuch Seite 24

R e m o t e c o n t r o l
Attention: The arbitrary waveform mode only af-
fects the left channel of the power supply; rapid
waveform generation is possible with this channel
only.
STOP
When the arbitrary mode is activated, the outputs of the HM8142
are automatically activated. The arbitrary mode can be termi-
nated by 2 different means:
– By pressing the LOCAL button
– By pressing the OUTPUT key
– By means of the command STP
When the arbitrary function is terminated by pressing the
LOCAL button, the last voltage value of the arbitrary function
remains active, and the outputs remain switched on. While
a waveform is being generated, the front panel controls are
disabled, except of the OUTPUT and LOCAL buttons. The arbi-
trary mode can be terminated by pressing the OUTPUT button.
This also has the effect of switching off the outputs. Pressing
this button again switches the outputs of the power supply on,
and that voltage value is pending at the outputs which had been
present prior to invoking the arbitrary function.
During operation, the righthand display shows the SET va-
lue of the righthand voltage source; due to time and accura-
cy limitations while the arbitrary mode is active, the HM8142
is unable to measure the actual voltage and current values
of this channel. If the arbitrary mode is restarted, it always
begins with fi rst value.
While the arbitrary function is running, the current limit set
cannot be changed. The current in either direction cannot ex-
ceed the programmed value. In order to prevent jitter of the
waveform, no data should be transferred via the interface while
the function is running.
Exception: the terminating command STP.
If incorrectly formatted data is received while the instrument is
loading the values of a function table, an audible alarm sounds.
"A-00" appears in the display of the HM8142. The LOCAL key
also begins fl ashing. This situation can be cleared in two ways:
by pressing the LOCAL button or sending the CLR command
by interface.
ABT
Format: ABT:<list of values> N<number of repetitions>
ABT:tVV.mVmV tVV.mVmV .... Nn
t = time code 0–9, A, B,C, D, E, F
VV.mVmV = 0–30 V
There may be a "space" between "t" and
"VV.mVmV". There must be a "space" between
"VV.mVmV" and "t".
N = end of table character
n = number of repetitions
There must be a "space" between VV.mVmV and N.
Function: Programming of the arbitrary waveform function.
The power supply permits creation of a data list con-
taining up to 512 voltage values along with the corre-
sponding time duration values. This list is transfer-
red in the form of a series of alternating values for
voltages in the range between 0.00 and 30.0 V and
hexadecimal codes representing the time duration
of each voltage; at the end of the list, the number of
repetitions is indicated.
How long each voltage appears at the outputs of the
HM8142 is derived from the following table:
0 = 100 ns
h
1 = 1 ms
h
2 = 2 ms
h
24
Subject to change without notice
All manuals and user guides at all-guides.com
Example: It is wished to program the following waveform:
ABT:A10.00 B30.00 A30.00 725.67 02.00 02.00 N10
* ) N = 0 : Continuous repetition
During data transfer, the lefthand display of the power supply
shows A1 (for arbitrary programming), and the righthand dis-
play shows the SET voltage value for the right channel. Due to
time limitations, the power supply is unable to measure the
actual current and voltage values of this channel when in ar-
bitrary mode.
After the table of values has been transferred, the power supply
indicates that it is ready for the start signal by displaying
"A II" in its lefthand display. This start signal can be:
–
–
This wait state can be interrupted by sending the command
ABX; the table of values remains stored in memory, and can
be started by the RUN command.
RUN/STP
Format:
Function: Starts waveform generation in ARB mode
Format:
Function : Interrupts the arbitrary function while running.
The power supply is put into waiting mode (see ABX command
above). It can now be restarted by RUN, or arbitrary mode can
be exited by the command ABX.
ABX
Format:
Function: Exits the arbitrary waveform mode.
The power supply is returned to normal mode, in other words
the same state as after power-up. This command does not
interrupt waveform generation while it is running. It only ter-
minates the waiting mode. To interrupt and exit this mode, the
sequence STP ABX is required.
3 = 5 ms
h
4 = 10 ms
h
5 = 20 ms
h
6 = 50 ms
h
7 = 100 ms
h
8 = 200 ms
h
9 = 500 ms
h
A = 1 s
h
B = 2 s
h
C = 5 s
h
D = 10 s
h
E = 20 s
h
F = 50 s
h
1 s 10.00 V
3 s 30.00 V
100 ms 25.67 V
200 us 2.00 V
It is also wished to repeat this sequence 10 times.
The required data table is as follows:
N = 1-255: Waveform is repeated 1-255 times
the bus command RUN
a low level applied to the TRIGGER IN/OUT
RUN
STP
ABX
* )
100 μs 2.00V
100 ms 25.67 V
2 s+1 s 30.00 V
1 s 10.00 V