GPIB OPERATION
4-7
Device dependent commands
The following list describes the features of the device dependent mnemonics for the 2050T Series
signal generators together with simple examples of their use within each major section (carrier
frequency, RF level, etc.) the root mnemonic is listed first followed by the lower level mnemonics.
Each group is followed by a list of requirements for data type and suffix.
In addition to the normal listen commands the 2050T Series accept query commands which cause
the instrument to prepare a message which will be sent to the controller when the instrument is
next addressed to talk. For each query an example of a response is given. Where responses are
similar for a group of queries not all are listed. Some queries can produce more than one type of
response - an example of each is usually given.
In the list which follows, the abbreviations <char>, <nrf> and <str> have the following meanings:
<char> = Character Program Data
<nrf>
= Decimal Numeric Program Data
<str>
= String Program Data
Where the data format is Decimal Numeric Program Data, the value may be expressed as a signed
or unsigned number in any of the following formats:
nr1:
Decimal integer, e.g. 1234 or -567
nr2:
Floating point number, e.g. 1.234 or -56.789
nr3:
Floating point number with exponent, e.g. 1.2345E5 or -12.47E-8
Default settings
These are the settings assigned to instrument functions in the following cases:
(i) Power-up to factory default settings.
(ii) Execution of *RST command.
(iii) Recall Full Store 50.
The instrument functions set to the factory default power-up state by the reset command (*RST)
are as shown in Table 4-1.
Table 4-1 Instrument default settings
Instrument mode
:
Normal
Carrier frequency
:
(Maximum available) 1.35 GHz/2.7 GHz/5.4 GHz
Step :
1 kHz
RF level
:
-144 dBm
Step :
1 dB
Status :
ON
Modulation mode
:
Single FM , modulation enabled
Modulations
:
FM1 :
0 Hz, Int F4, ON
FM2 :
0 Hz, Ext 1 ALC, ON
Φ
M1 :
0 rad, Int F4, ON
Φ
M2 :
0 rad, Ext 1 ALC, ON
AM1 :
0%, Int F4, ON
AM2 :
0%, Ext 2 ALC, ON
WBFM:
(Minimum setting), AC coupled, ON
Steps :
Δ
FM 1 kHz,
Δ
Φ
M 0.1 rad,
Δ
AM 1
%