HP 3562A Operating Manual page 236

The Synthesis Functions Menu
The synthesis functions menu allows you to add system gains, time delays and scaling fre­
quencies to synthesis tables, The values entered are used by the instrument when it creates
the trace, Note that the values must be entered before the trace is synthesized. Pressing
SYNTH FCTN displays the following menu:
GAIN
FACTOR
TIME
DELAY
SCALE
FREQ
RETURN
To illustrate the use of GAIN FACTOR, synthesize a 20 kHz low-pass filter (single pole), In pole/
zero format, enter a pole at - 20kHz, The equation for this filter is:
This yields a pass band gain (at OHz) of
press GAIN FACTOR then enter 20000, This changes the eqUAtion to:
Now the gain is (Odb) at OHz,
1
Used to enter the constant (K) if needed to set the desired
gain of a synthesized frequency response function, See
the example following this menu,
Used to enter time delay values for simulating delays i n
the synthesized frequency response, The delay i s entered
in microseconds, milliseconds or seconds; the default is
0,0 seconds,
Used to enter the scaling frequency, This frequency is
multiplied by ihe values in the table to scale the curve up
or down in frequency without having to change every
value, The frequency can be entered in Hz, RPM, or
orders; the range is 10-6 to 106. An example use of scale
frequencies is entering normalized values from a filter
design handbook then translating the function to the
desired range. You can also convert Hz to radians.
SCALE FREO should be used to avoid the occurrence of
very large or very small numbers.
Redisplays the POLE ZERO, POLE RESIDU,
NOMIAL menu, depending on the type of synthesis
selected,
1
f
_
(s) -
s + 20kHz
'120000
( - 86dB), If you wanted a gain of
_=20",0:.:0c: :O_
f lS) =
s + 20000
FREQUENCY RESPONSE SYNTHESIS
Of
POLY­
(OdB),
1
9-21