PPA5xx/15xx user manual
4-4
4.2 Numeric data entry
Parameters such as external shunt impedance and scale
factor are entered as real numbers; shunt impedance is an
example of an unsigned parameter; scale factor is an
example of a signed parameter.
Real numbers are entered using the number keys,
multiplier keys, decimal point key, or +/- key (if signed
value is permitted). When the character string has been
entered, pressing the ENTER key sets the parameter to the
new value. Until the ENTER key is pressed, pressing the
HOME key aborts the data entry and restores the original
number.
If a data value is entered that is beyond the valid limits for
that parameter, then a warning is issued, and the
parameter set as close to the requested value as possible.
For example, the minimum user defined measurement
window 10ms; if a value of 5ms is entered, a warning will
be given, and the amplitude set to the maximum of 10ms.
When the parameter is first selected there is no character
cursor visible – in this condition, a new number may be
entered directly and will overwrite the existing number.
To edit a data value rather than overwrite it, press the R
key and a cursor will appear. New characters are inserted
at the cursor position as the keys are pressed, or the
character before the cursor position can be deleted with
the DELETE key.
Data values are always shown in engineering notation to
at least 5 digits (1.0000-999.99 and a multiplier).
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