HP 3312A Service Manual

Section HI
3-58. Main Generator Operation.
3-59. The sine triangle and square waveforms, selected with
interlocking pushbuttons, are available at the BNC output
jack. The RANGE Hz pushbuttons and frequency dial
select frequencies from 0.1 Hz to 13 MHz in eight over-
lapping ranges. The frequency dial scale must be multiplied
by the RANGE Hz setting to obtain the frequency.
3-60. With the AMPLITUDE knob in the 10 position and
no load, a 10 volt peak signal is selected. The VERNIER
control adjusts the voltage from greater than 10 volts to I
volt at that setting. In the 1 position the voltage is
adjustable from 1 volt to .1 volts; in the .1 position the
voltage is adjustable from .1 volts to .01 volts; and in the
OL position from .01 volts to 0.
3-61. The symmetry of any waveform can be varied with
the SYM knob. The square waveform can be varied from
symmetrical to a ratio of 80:20 to 20:80 up to 1 MHz.
3-62. OFFSET changes the dc level of the waveform. The
CAL button eliminates de offset. The peak ac voltage plus
the dc offset should not exceed 10 V to avoid clipping of
the output waveform.
3-63. Burst.
3-64. With the rear panel TRIGGER switch (2) set to INT,
the upper slide switch (1) set to either SINGLE or
MULTIPLE, and TRIGGER PHASE (10) out of the FREE
RUN position, internal burst is initiated. The TRIGGER
PHASE knob controls the starting and stopping phase of
the output waveform. The SINGLE-MULTIPLE switch
selects a single cycle or multiple cycles respectively. Pulses
are obtained only when the square wave function is pushed.
100% tM
OTP ET
AMPLITUDE
WENN. kA
Press AM pushbutton,
Select a function.
Set the percent moduiation,
set the modulation frequency.
SYM in the CAL. position,
SSeS
Model 3312A
MERCURY 7
Figure 3-7. External VCO,
The pulse width is set by the main generator’s FRE-
QUENCY dial and the modulation generator’s RANGE Hz
Knob sets the repetition rate. The TRIGGER PHASE knob
in the FREE RUN position disables the burst (see Figure
3-11 for burst operation).
3-65. With the rear panel slide switch (2) set to EXT, an
external burst may be applied in either single or multiple
cycles. TRIGGER PHASE is still operational. The external
gating signal frequency range is from dc to 1 MHz. The
input voltages must be TTL compatible.
3-66. VCO.
3-67. A de voltage from 0 V to -2 V applied to the rear
panel VCO connector is sufficient to vary the frequency of
the main generator over three decades. Since some dc
power supplies induce some noise, a supply similar to
the one in Figure 3-7 works well.
3-68. Modulation Generator Operation.
3-69.
Figures
3-8
through
3-10
are
operating
illustrations
containing
step-by-step
operating
procedures
indexed
to
the
AM with sine wave
AM with square wave
Figure 3-8. AM Operation.
3-6

HP 3312A Specifications

General

Brand	HP
Model	3312A
Category	Inverter
Language	English