3-17
NOTES:
3.
The manual trigger level is automatically scaled by a factor of 10
when the X10 attenuator key is toggled in or out-of-circuit. The
correct input attenuation must be selected before storing or recalling
the trigger level.
4.
The SM and RM codes are used to store and recall complete
measurement setups into RAM. Both SM and RM must be followed
by a measurement setup number from 0 to 9.
3.13
Special Functions
3.13.1 The 2251A allows for extended capabilities by the use of special functions. Special functions
are organized by decades, one for each of the nine mantissa output string digits. One special
function from each decade may be entered into the special function register, but only the
second digit of the special function number is stored. The first digit of the special function
number is indicated by the position in the output string. The default state has 0's entered in
all positions. The special function output string is generated in response to the RSF
command code.
3.13.2 Special function numbers must be entered into memory before special functions can be
enabled. When a number is stored, it overwrites the number stored in the same decade.
Therefore, to remove a number from its register, another number from the same decade must
be stored.
3.13.3 The power-on home state for special functions is that none are stored, that is, all are at the
default for the decade (10, 20....80)
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