Frequency; Phase; Pulm (Pulse Modulation); Am (Amplitude Modulation) - Hameg HM8134-3 User Manual

FREQUENCY

Commands in order to change the frequency
Syntax:
:FREQuency[:CW|:FIXed] <NUM>
:FREQuency[:CW|:FIXed]?
Sending line (1) modifies the carrier frequency. The <NUM>
parameter is a NR1 or NR2 or NR3 number (see paragraph
Syntax conventions). No unit has to follow the number, the Hz
unit is the default one. The value is rounded (same as the keypad)
to the resolution. The CW and FIXed options have no particular
effect on the instrument, they are present for compatibility with
programs existing in the SCPI standard.
Sending line (2) the instrument returns the current (carrier)
frequency. The instrument sends back a string representing a
NR3 decimal number.
Examples:
:FREQ 678E+6 Setting of the frequency to 678 MHz
:FREQUENCY 34000000 Setting of the frequency to 34 MHz
:FREQ? Request for frequency
:FREQ:FIX 900E+6 Setting of the frequency to 900 MHz

PHASE

Commands in order to select the source of the reference signal
Syntax:
:PHASe:SOURce INTern | EXTern
:PHASe:SOURce?
Sending line (1) the current reference can be selected. Only
one of the 2 parameters must be present: INTern for turning
the internal reference on or EXTern for turning the external
reference on.
Note:
It is strongly advised to check the current state
after the command (1) sent. For example with the
query command (2).
Sending line (2) the instruments returns which source is cur-
rently selected. The instrument sends back the strings INT or
EXT corresponding to the 2 options described above.
Examples:
:PHAS:SOURCE EXT Activating the external reference
:PHASE:SOUR? Request for current reference
:PHAS:SOUR? Request for current reference
(abbreviated form)

PULM (PULse Modulation)

Commands in order to modify the GATE modulation.
Syntax:
:PULM:STATe 1 | ON | 0 | OFF
:PULM:STATe?
Sending line (1) the GATE modulation can be activated or deac-
tivated. The parameters 1 or ON turn the modulation on and 0
or OFF turn the modulation off (if present).
Sending line (2) the instruments returns the state of the GATE
modulation. The instrument sends back 0, if the modulation is
switched off, and 1, if the modulation is online.
:PULM:POLarity NORMal | INVert
:PULM:POLarity?
Sending line (3) the validation level of the GATE modulation can
(1) be set. The parameter NORMal represents high level validation
(2) and INVert represents low level validation.
Sending line (4) the instrument returns the current level state.
The instrument sends back 1 for high level (NORMal) and 0 for
low level (INVert).

AM (Amplitude Modulation)

Commands in order to modify AM parameters
Syntax:
:AM[:DEPTh] <NUM>
:AM[:DEPTh]?
Sending line (1) the modulation depth can be modified. The
<NUM> parameter is a NR2 number (see paragraph Syntax
conventions). No unit has to follow the number, % unit is the
default one. If the value has an accuracy higher than the
resolution (0.1%), the number is rounded to the resolution.
Sending line (2) the instrument returns the current depth
of modulation. The instruments sends back a NR2 number
corresponding to the resolution (one digit after the decimal
point) without unit.
:AM:SOURce INTern | EXTern
(1) :AM:SOURce?
(2)
Sending line (3) the modulation source can be selected and the
FM will be turned on.
Sending line (4) the instrument returns the source modulation.
The instrument sends back the strings INT or EXT (not INTERN
or EXTERN). If the AM is turned off, the string INT is sent back
because this source is the default setting for the command
AM:STAT 1 .
:AM:INTern:FREQuency <NUM>
:AM: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 instruments returns the current modulation
frequency. The instrument sends back a string representing a
NR3 decimal number.
:AM:INTern:SHAPe SIN | SQU | TRI | +RP | -RP
:AM:INTern:SHAPe?
Sending line (7) the shape of the internal modulation signal
(1) can be changed.The parameters are: SIN for a sine signal,
(2) SQU for square, TRI for triangle, +RP for a positive ramp and
–RP for a negative ramp.
Sending line (8) the instrument returns the current shape. The
instrument sends back the same strings as the corresponding
command parameters above.
:AM:STATe 0 | OFF | 1 | ON
:AM:STATe?
O p e r a t i n g c o n t r o l s
(3)
(4)
(1)
(2)
(3)
(4)
(5)
(6)
(9)
(10)
Subject to change without notice
(7)
(8)
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