RF Blaster minimum frequency is incorrect

[philipstarkey]

Original report (archived issue) by Philip Starkey (Bitbucket: pstarkey, GitHub: philipstarkey).

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Bug report moved from BLACS (labscript-suite/blacs#3):

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In manual mode, any frequency <0.5MHz is set to 0.5MHz.
If the rfblaster is programmed to such a frequency through the web interface, it works, but BLACS reports the frequency as 0.5MHz regardless.
Minimum value on the input box maybe?

Unsure of what the minimum RF Blaster DDS frequency is. Need to check and update the BLACS tab class with the correct minimum value.