Rohde & Schwarz Hameg HM8150, User Manual

Page: 30 / 36

30
Command reference
OT1/OT0
Format: OT1 Switch on output
Format: OT0 Switch off output
OF1/OF0
Format: OF1 Enabling of the offset
Format: OF0 Disabling of the offset
INV
Format: INV
Function: Inversion of the output signal. The INVERT func-
tion is disabled by sending a command of the waveform
group. In ramp, pulses and arbitary mode the signals are
inverted. If the INVERT function is activated with the sine
wave, square wave or triangel function, the signal is 180
degrees phase shifted with respect to the trigger signal
(TRIG. OUTPUT) .
6.4 Display
Command Description
DFR Display of the signal frequency
DST Display of the start frequeny (sweep)
DSP Display of the stop frequency (sweep)
DSW Display of the sweep time
DWT Display of the pulse width
DAM Display of the signal amplitude
DOF Display of the offset voltage
These commands are used display the desired parameter.
In remote mode the changed parameters are not displayed
automatically. If you want tofunction generator to return
the current parameters via interface you can use the com-
mands for the parameter query. If you want the instrument
to dispaly the parameters for a visual check, you send the
corresponding command listed above.
6.5 Parameters
Command Description Illuminated button
FRQ: < Data > Frequency FREQ
STT: < Data > Start frequency (sweep) START
STP:
<
Data
>
Stop frequency (sweep) STOP
SWT: < Data > Sweep time TIME
WDT: < Data > Pulse width PULSE
AMP: < Data > Output voltage AMPL
OFS: < Data > Offset OFFSET
In order to change frequency, offset, signal amplitude etc.
the parameter command group is required. The parame-
ter may be sent using various formats: If you want the func-
tion generator to return the current parameters via interface
you can use the commands for the parameter query. If you
want the instrument to dispaly the parameters for a visual
check, you send the corresponding command listed above.
Example:
Set the signal frequency to 1 kHz:
FRQ:1000
FRQ:1000.0
FRQ:1E3
FRQ:1.0000E3
FRQ:10000E-1
6.6 Parameter request
Command Description Answer
FRQ? Frequency FRQ:1.2345E+3
STT? Start frequency (sweep) STT:2.0000E+3
STP? Stop frequency (sweep) STP:1.0000E+4
SWT? Sweep time SWT:3.0000E+2
WDT? Pulse width WDT:45.6E-6
AMP? Output voltage AMP:10.00E+0
OFS? Offset OFS:3.00E+0
In order to request the actual parameter settings of the
HM8150 use the commands of group 6. The answer of the
instrument consists of the name of the parameter resp.
command and the parameter itself which is given in the
format floating number plus exponent .
Example:
FRQ:1.2345E+3 Frequency = 1.2345 kHz
OFS: –3.0E+0 Offset = –3.0 V
WDT: 45.6E-6 Pulse width = 45.6 µs
*IDN?
Format: *IDN?
Function: Read the function generator’s identification
string which contains three fields separated by commas.
The first field is the manufacturer’s name, the second field
is the model number, the third field is a revision code.
Example:
HAMEG Instruments,HM8150;f.ff
(with f.ff = firmware version)
VER?
Format: VER?
Function: Return the firmware version
Exmaple: V1.0
STA?
Format: STA?
Function: Rerturn the current instruments settings. Be sure
to dimension a string variable with at least 21 characters).
Example:
OT0OF0SW0SINCTMDFRDOF
Explanation:
OT0 = Output off
OF0 = Offset off
SW0 = Sweep off
SIN = Sine wave
CTM = Operating mode continuous
DFR = Display of the signal frequency
DOF = Display of the offset voltage
6.7 Arbitrary
10 bit 12 bit Description
ARC ARC4 Reset of the arbitrary data
ARD? ARD4? Return of all saved values
ARP= ARP4: Input of the arbitrary data
ARD= ARD4= Input of the arbitrary data
ARE
ARE Calculation of the arbitrary data
ARC ARC4
Initialisation of the arbitrary memory. All arbitrary data is
deleted. All values and the adress counter are reset.