Hameg HM8134-3, User Manual

43

Remote Operation

Sending line (2) the instruments returns which source is 
currently 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)

6.12  PULM (PULse Modulation)

Commands in order to modify the GATE modulation.

Syntax:

:PULM:STATe  1 | ON | 0 | OFF 

(1)

:PULM:STATe? 

   (2)

Sending line (1) the GATE modulation can be activated or 
deactivated. 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 mo-
dulation is switched off, and 1, if the modulation is online.

:PULM:POLarity NORMal | INVert  

(3)

:PULM:POLarity?   (4)

Sending line (3) the validation level of the GATE modula-
tion can be set. The parameter NORMal represents high le-
vel validation 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).

6.13  AM (Amplitude Modulation)

Commands in order to modify AM parameters

Syntax:

:AM[:DEPTh] 

<NUM> 

  (1)

:AM[:DEPTh]? 

   (2)

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 num-
ber corresponding to the resolution (one digit after the 
decimal point) without unit.

:AM:SOURce INTern | EXTern 

(3)

:AM:SOURce? 

   (4)

 
Sending line (3) the modulation source can be selected 
and the FM will be turned on. 
Sending line (4) the instrument returns the source modu-
lation. 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>   

(5)

:AM:INTern:FREQuency? 

  (6)

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 modu-
lation frequency. The instrument sends back a string repre-
senting a NR3 decimal number.

:AM:INTern:SHAPe SIN | SQU | TRI | +RP | -RP 

(7)

:AM:INTern:SHAPe? 

   (8)

Sending line (7) the shape of the internal modulation signal 
can be changed.The parameters are: SIN for a sine signal, 
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 corres-
ponding command parameters above.

:AM:STATe   0 | OFF | 1 | ON 

(9)

:AM:STATe? 

   (10)

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 pro-
gress, and 1,  if AM is present.

Example: 

:AM:INT:FREQ  1200;  SHAP  SQU;  DEPT  60; STAT 1

6.14  FM (Frequency Modulation)

Commands in order to modify FM parameters

Syntax:

:FM[:DEViation] 

<NUM> 

  (1)

:FM[:DEViation]? 

   (2)

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 de-
viation. The instrument sends back a string representing a 
NR3 decimal number.

:FM:SOURce  INTern | EXTern 

(3)

:FM:SOURce? 

   (4)

Sending line (3) the modulation source is set and the FM is 
turned on at the same time.