Fm (Frequency Modulation); Pm (Phase Modulation) - Hameg HM8134-3 Handbuch

O p e r a t i n g c o n t r o l s
Sending line (9) the AM modulation can be turned on or off.
Sending the parameters 1 or ON, AM will be turned on, and
sending the parameters 0 or OFF, the modulation will be turned
off (if present).
Sending line (10) the instrument returns the current AM state.
The instrument sends back 0, if no AM is in progress, and 1, if
AM is present.
Example:
:AM:INT:FREQ 1200; SHAP SQU; DEPT 60; STAT 1

FM (Frequency Modulation)

Commands in order to modify FM parameters
Syntax:
:FM[:DEViation] <NUM>
:FM[:DEViation]?
Sending line (1) the FM deviation can be modified. The <NUM>
parameter is a NR1 or NR2 or NR3 number (see paragraph
Syntax conventions). No unit has to follow the number, Hz unit
is the default one. The value is rounded to the resolution.
Sending line (2) the instrument returns the current FM devia-
tion. The instrument sends back a string representing a NR3
decimal number.
:FM:SOURce INTern | EXTern
:FM:SOURce?
Sending line (3) the modulation source is set and the FM is
turned on at the same time.
Sending line (4) the instrument returns the FM source. The
instrument sends back the strings INT or EXT (not INTERN or
EXTERN). If the FM is turned off, the string INT is sent back
because the internal source is the default setting for the com-
mand FM:STAT 1 .
:FM:INTern:FREQuency <NUM>
:FM:INTern:FREQuency?
Sending line (5) the frequency of the internal modulation signal
can be changed. The <NUM> parameter is a NR1 or NR2 or
NR3 number (see paragraph Syntax conventions). No unit has
to follow the number, Hz unit is the default one. The value is
rounded to the resolution.
Sending line (6) the instrument returns the current modulation
frequency. The instrument sends back a string representing a
NR3 decimal number.
:FM:INTern:SHAPe SIN | SQU
:FM:INTern:SHAPe?
Sending line (7) the shape of the internal modulation signal
can be changed. The parameters are: SIN for a sine signal,
SQU for square.
Sending line (8) the instrument returns the current shape. The
instrument sends back the same strings as the corresponding
command parameters above.
:FM:STATe 0 | OFF | 1 | ON
:FM:STATe?
Sending line (9) the FM can be turned on or off. The FM is turned
42
Subject to change without notice
on by sending parameters 1 or ON and the parameters 0 or OFF
turn the modulation off (if present).
Sending line (10) the instrument returns the current FM state.
The instrument sends back 0, if no FM is in progress, and 1, if
FM is present.
:FM:EXTern:COUPling AC | DC
:FM:EXTern:COUPling?
Sending line (13) the external FM modulation is set to AC or
DC mode.
Sending line (14) the instrument returns the current state. The
instrument sends back the same strings as the corresponding
command parameters above.
Example:
(1)
(2) FM:INT:FREQ 9E+3; SHAP SIN; DEV 150E+3; STAT ON

PM (Phase Modulation)

Commands in order to modify PM parameters
Syntax:
:PM[:DEViation] <NUM>
:PM[:DEViation]?
(3) Sending line (1) the PM deviation can be modified. The <NUM>
(4) parameter is a NR2 number (see paragraph Syntax conven-
tions). No unit has to follow the number, the current unit is
the default one. If the value has an accuracy higher than the
resolution, the number is rounded to the corresponding digit.
Sending line (2) the instrument returns the current PM deviation.
The instrument sends back a string representing a NR2 decimal
number (without unit).
:PM:UNIT RAD | DEG
:PM:UNIT?
(5)
(6) Sending line (3) the current unit of the phase can be changed.
Two parameters are possible: RAD for radian or DEG for degree.
Sending line (4) the instrument returns the current unit. The
instrument sends back the same strings as the corresponding
command parameters above.
:PM:SOURce INTern | EXTern
:PM:SOURce?
Sending line (5) the modulation source can be selected and at
the same time the PM is turned on.
(7)
(8) Sending line (6) the instrument returns the PM source. The
instrument sends back the strings INT or EXT (not INTERN or
EXTERN). If the PM is turned off, the string INT is sent back be-
cause the internal source is the default setting for the PM:STAT
1 command.
:PM:INTern:FREQuency <NUM>
:PM:INTern:FREQuency?
Sending line (7) the frequency of the internal modulation signal
(9) can be changed. The <NUM> parameter is a NR1 or NR2 or
(10) NR3 number (see paragraph Syntax conventions). No unit has
to follow the number, Hz unit is the default one. The value is
rounded to the resolution.
(13)
(14)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)