FREQuency Subsystem
[SOURce[1|2]:]FREQuency:COUPle:OFFSet <frequency>
[SOURce[1|2]:]FREQuency:COUPle:OFFSet?
Sets the offset frequency when an instrument is in frequency coupled mode OFFSet.
Parameter Typical Return
A number between plus and minus the instrument's maximum frequency (limited
to ± 200 kHz for ramps); default 0.
+7.650000000000000E+05
Set frequency of channel 2 to 10.245 MHz above frequency of channel 1:
FREQ:COUP:OFFS 10.245 MHZ
Set frequency of channel 1 to 350 kHz above frequency of channel 2:
SOUR2:FREQ:COUP:OFFS 350 KHZ
Set frequency of channel 1 to 455 kHz below frequency of channel 2:
SOUR2:FREQ:COUP:OFFS -455 KHZ
l The SOURce channel (SOURce1 or SOURce2) is used as the reference channel and the OFFSet is applied to the other
channel. For example, suppose the instrument is in FREQ:COUPLE:STATE ON and in FREQ:COUPLE:MODE OFFSET
(frequency offset mode active), and channel 1 is currently operating at 1.0000 MHz. The command SOURce1:FREQu-
ency:COUPle:OFFSet 500 will cause channel 1 to remain at 1.000 MHz, and channel 2 to be set to 1.500 MHz. As the
frequency of either channel is changed, the frequency of the other channel will change to maintain the 500 kHz offset.
l If the frequency coupling would cause either channel to exceed instrument frequency specifications for the
present functions, the command will result in an error, and the frequency will be set to its maximum or minimum
limit for that channel.
l Frequency coupling is not valid with arbitrary waveforms.
[SOURce[1|2]:]FREQuency:COUPle:RATio <ratio>
[SOURce[1|2]:]FREQuency:COUPle:RATio?
Sets offset ratio between channel frequencies in frequency coupled mode RATio.
Parameter Typical Return
0.001 to 1000, default 1 +7.500000000000000E-01
Set frequency of channel 2 to twice the frequency of channel 1:
FREQ:COUP:RAT 2.0
Set frequency of channel 1 to 3.14 times the frequency of channel 2:
SOUR2:FREQ:COUP:RAT 3.14
l The SOURce channel (SOURce1 or SOURce2) is used as the reference channel and the RATIO is applied to the
other channel. For example, suppose the instrument is in FREQuency:COUPle ON and FREQuency:COUPle:MODE
RATio. Furthermore, suppose channel 1 is currently operating at 2 kSa/s, and channel 2 is at 10 kSa/s. The com-
mand SOURce1:FREQuency:COUPle:RATio 2.5 will cause channel 1 to remain at 2 kHz, and Channel 2 to be set to
5 kHz. As the frequency of either channel is changed, the frequency of the other channel will change to maintain
the 2.5 ratio.
204 Agilent 33500 Series Operating and Service Guide
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