Amplitude Sweep; Characteristics; How To Turn On Amplitude Sweep - HP 8642A Operating Manual

vlodel 8642A/B
Operation
AMPLITUDE SWEEP
Description The Signal Generator can amplitude sweep between a start end-point and a stop
end-point in linearly spaced, incremental steps.
Sweep step size is automatically selected based on the amplitude span (which is the
absolute value of the start amplitude minus the stop amplitude) and the sweep time.
Although step size cannot be directly set, this operating instruction provides ways to
calculate a sweep time to enable you to select a particular step size or number of steps.
Table 3-16. Amplitude Sweep Operating Characteristics
Electrical
Characteristics
Output Amplitude Sweep
Range
1
Sweep Time
Accuracy
X Axis Output
Z Axis Output
'An output amplitude sweep range
2
Buffer this output in order to use
Performance
Limits
20 dB logarithmic
20 dB linear (with Special Function 122)
20 ms minimum
999s maximum
±1 dB
±3 dB
0 to 10 Vdc
TTL positive true
Conditions
Over highest 10 dB of
amplitude range
Over second highest
10dB of amplitude range
±10%
For crt display blanking
during retrace
2
of 30 dB is possible. However, the lowest 10 dB of amplitude range is not specified.
the Z-axis output with a plotter for pen lift.
Procedures Note: Put the instrument in an initialized state by selecting I INSTR PRESET I.
How to Turn On Amplitude Sweep
Turn on amplitude sweep by selecting the amplitude sweep mode, the sweep time, and
the start and stop amplitude values (procedures for selecting these parameters are
described in this instruction). Upon selection of amplitude sweep, the two sweep
end-points are displayed as the start amplitude and the stop amplitude. These
end-points will be shown as AA.OFF and AB.OFF until sweep values are entered. (AA
and AB are the HP-IB codes for start amplitude and stop amplitude, respectively.)
Note that if the sweep mode has not been selected since the last time Instrument
Preset has been selected, auto sweep is automatically selected and causes the Signal
Generator to begin sweeping immediately after end-points are set. (The SWPNG
annunciator indicates that a sweep is occurring.)
3 - 8 3