The FREQuency subsystem sets the instrument's output frequency. In two-channel instruments, the channels' frequencies may be coupled in various ways.
FREQuency:COUPle[:STATe] {ON|OFF|ONCE} enables or disables coupling, or using the ONCE, one channel's is copied to the other, but not coupled to it.
FREQuency:COUPle:MODE {OFFSet|RATio} specifies the frequency coupling mode.
FREQuency:MODE allows you to specify a frequency mode to use, including a sweep, frequency list, or fixed frequency.
The remaining FREQuency commands are used to generate a sweep, as summarized below:
Sets the output frequency. This command is paired with FUNCtion:PULSe:PERiod; whichever one is executed last overrides the other.
Parameter | Typical Return |
---|---|
1 μHz to maximum instrument frequency. Default 1 kHz. | +1.000000000000000E+03 |
Set output frequency to 60 Hz: FREQ 60 |
Sets the center frequency. Used with frequency span for a frequency sweep.
Parameter | Typical Return |
---|---|
1 μHz to maximum instrument frequency, Default 550 Hz | +1.000000000000000E+03 |
Set sweep center frequency to 1 kHz: FREQ:CENT 1000 |
Enables/disables frequency coupling between channels in a two-channel instrument.
Parameter | Typical Return |
---|---|
{ON|1|OFF|0}, default OFF | 0 (OFF) or 1 (ON) |
Turn on the frequency couple state: FREQ:COUP ON |
Sets the type of frequency coupling between frequency coupled channels; OFFSet specifies a constant frequency offset between channels; RATio specifies a constant ratio between the channels' frequencies.
Parameter | Typical Return |
---|---|
{OFFSet|RATio}, default RATio with ratio 1.0 | OFFS or RAT |
Set frequency coupling mode to OFFSet: FREQ:COUP:MODE OFFS |
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 for the waveform; default 0. | +7.650000000000000E+05 |
Set frequency of channel 2 to 10.245 MHz above frequency of channel 1: Set frequency of channel 1 to 350 kHz above frequency of channel 2: Set frequency of channel 1 to 455 kHz below frequency of channel 2: |
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: Set frequency of channel 1 to 3.14 times the frequency of channel 2: |
Sets the type of frequency mode as a continuous wave at a fixed frequency (CW or FIXed), a frequency sweep (SWEep), or a frequency list (LIST).
Parameter | Typical Return |
---|---|
{CW|LIST|SWEep|FIXed}, default CW | CW, LIST, SWE, or FIX |
Set frequency mode to LIST: FREQ:MODE LIST |
Sets frequency span (used in conjunction with the center frequency) for a frequency sweep.
Parameter | Typical Return |
---|---|
± instrument's maximum frequency for the waveform, default 900 Hz | +1.000000000000000E+02 |
Set sweep frequency span to 100 kHz: FREQ:SPAN 100 KHZ |
Sets the start and stop frequencies for a frequency sweep.
Parameter | Typical Return |
---|---|
± instrument's maximum frequency for the waveform, default 100 Hz | +1.000000000000000E+02 |
Set sweep start and stop frequency to 100 Hz and 1 kHz, respectively: FREQ:STAR 100 FREQ:STOP 1000 |