SUPPLEMENTAL TECHNICAL DATA
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MODELS HP E1440A AND HP 3324A
SWEEP OPERATION
SWEEP CYCLING: single or continuous (auto cycle).
==============
PHASE: continuous during any sweep cycle.
PHASE LOCK: it is not possible to phase lock two or more function generators
when operating in sweep mode.
SINGLE CYCLE: HP-IB or manual command (green key) starts, stops and resets
sweep:
|---Sweep time---->
Press Green key- - -> Fstart -------:---------> Fstop - - - ->:
(= start) : :
: Press :
: Green key :
: (= stop) :
: Press : :
<- - - - - - Green key <- - - :<- - - - - - - - - - - - :
/ (= reset \
/ to Fstart) \Frequency display shows Fstop or
/ "stopped" frequency. Note, stopped
Frequency display sweep cannot be continued.
shows Fstart
CONTINUOUS CYCLE: HP-IB or manual command (green key) starts and stops sweep:
<---Retrace time---|
:<- -Fstart<------------------ Fstop <- - - -:
: :
: :
: |---Sweep time----> :
Press Green key- -:-> Fstart -------:---------> Fstop - - - ->:
(= start and reset) :
: :
: Press Green key
:<- - - - - - - - - - - - - - (= stop)
/
/
Frequency display
shows Fstop
RETRACE TIME: programmable from minimum (typ 5 ms) to 100 000 s.
SWEEP MODES
===========
MULTI-INTERVAL: this mode allows complex sweep profiles to be set up.
Application examples: simulation of a tacho output used in monitoring
motor acceleration and braking, tone sequencing in general electronics.
LINEAR SWEEP (up, down and constant tone allowed):
F START: Min 1 mHz. Max 21 MHz (sine)/11 MHz (sq)/11 kHz (triangle, ramp).
F STOP: as F start.
Note: For constant tones, stop and start frequencies can be set to the same
value. If this value is zero, the dc-level produced has the same ma
nitude
as the instantaneous voltage at the end of the previous segment. The
segment following a "dc segment" will start at the same voltage.
SWEEP TIME: 0.01 s to 100 000 s. Accuracy: 5%.
MIN SWEEP RATE: 0.2 Hz/s (exception: constant-frequency segment).
MAX SWEEP RATE: 2.1E^9 Hz/s.
UPDATE RATE: 100 kHz.
LOGARITHMIC SWEEP (up sweep only).
F START: 1 Hz min. Max as Lin Sweep.
F STOP: min 10x Fstart, max as F start.
SWEEP TIME: min 0.1 s. Max up to 100 000 s, but for start frequencies
<10 kHz, maxima down to 12 s may be required for reasonable log
approximation. Too long a sweep time can cause the sweep to dwell.
LOG APPROXIMATION: log sweep consists of a number of linear segments. For
sweep times <1 s, the number is always 2. Otherwise up to 73 segments, as
given by log (Fstop) - log (Fstart). Hardware limit for min sweep rate is
0.01 Hz/s.
MARKER OUTPUT: one high-to-low transition per interval.
MARKER FREQUENCY: programmable. Limits depend on sweep rate, 1.5 ms must
elapse between start and marker, and between marker and stop.
NUMBER OF INTERVALS: 1 to 50 different intervals, as required.
SEQUENCE LENGTH: 1 to 100 intervals, as required.
SWITCHING-TIME BETWEEN INTERVALS: depends on step between stop frequency of
one interval, and start frequency of next interval. Examples:
0 Hz step takes typically 5 ms,
100 kHz step takes up to 12 ms,
1 MHz step takes up to 27 ms,
20 MHz step takes up to 72 ms.
SWEEP EQUALITY: the sweep dwells at Fstop during switching time, so the sweep
rate of the next segment is somewhat faster than indicated by span/time. For
a symmetrical up/down sweep, set the sweep time of the second interval to
about 5 ms longer than that of the first interval, and adjust for equality.
MULTI-MARKER (SINGLE-INTERVAL)
MARKER OUTPUT: up to 9 high-to-low transitions per sweep.
MARKER FREQUENCY: as Multi-Interval mode. Additionally, 1.5 ms must elapse
between markers.
LIN/LOG SWEEP: specifications as for multi-interval mode.
pg/ Nov 91
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