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Common Measurement Functions
FREQ Channel
Start Freq
Sets the frequency at the left side of the graticule. While adjusting the start frequency, the stop frequency
is held constant, which means that both the center frequency and span will change.
Start Freq also sets the frequency entry mode to Start or Stop. In Start or Stop mode, the start frequency
and stop frequency values are displayed below the graticule, and the default active function in the
Frequency menu is
Start Freq.
Max: 40.049995 MHz
Initial S/W Revision: Prior to A.02.00
Key Path:
FREQ Channel
Remote Command: [:SENSe]:FREQuency:STARt <freq>
[:SENSe]:FREQuency:STARt?
Example: FREQ:STAR 200 MHz
FREQ:STAR?
Notes: Max values depends on Hardware Options (5xx)
Dependencies: By direct entry:
You cannot set Start frequency > Stop frequency. You cannot set Start
frequency = Stop frequency. You cannot select zero span by setting Start =
Stop. You cannot set Start Frequency to a value that would create a span of
less than 10 Hz. If you try to do any of these, Stop Frequency will change to
maintain a minimum value of 10 Hz for the difference between Start and Stop.
With the knob or step keys:
Cannot increment Start Freq to a value greater than Stop Freq – 10 Hz. If
already in zero span, cannot increment at all, and the first decrement will be
forced to at least 10 Hz.
The Start Frequency can be limited by Span limits, if the Stop Frequency is
below its preset value.
If the electronic/soft attenuator is enabled, any attempt to set the Start
Frequency such that the Stop Frequency would be >3.6 GHz fails and results
in an advisory message. If the equivalent SCPI command is sent, this same
message is generated as part of a “–221, Settings conflict” warning.
If Source Mode is set to Tracking, and the Max or Min Start Freq is therefore
limited by the limits of the source, a warning message is generated, “Data out
of range;clipped to source max/min” if these limits are exceeded. Note that
for an external source, these limits can be affected by the settings of Source
Numerator, Source Denominator and Power Sweep.