HP 3312A Service Manual

Model 3312A
3-42. FM.
3-43. The frequency of the main generator can be varied
up to + 5% by the modulation generator. The modulation —
frequency can be set from 0.0] Hz to 10 kHz, and any of
the modulation waveforms can be used to FM.
3-44, SWP,
3-45. When the SWP button is pressed, the modulation
generator produces a linear ramp which sweeps the fre-
quency of the main generator. With the RANGE Hz knob
in the 0 Hz position, the "Sweep Start” frequency can be
et. The stop frequency, or the frequency at which the
sweep terminates, is set with the main frequency dial. The
rate of sweep is governed by the SYM knob.
3-46, External Control.
3-47. The front panel MOD INT-EXT input/output con-
nector is to be used for external amplitude modulating or
frequency modulating the main generator. For AM opera-
tion, an external input of less than 10 V p-p will give 100%
modulation. For FM operation, the external frequency may
be varied from dc to greater than 50 kHz. The AM and FM
pushbuttons must still be used.
3-48. The frequency of the main generator can be tuned
remotely by applying 0 V to - 2 V de to the VCO connector
on the rear panel. With the dial set to 10, any range can be
varied over the entire dial range within the limit set by the
range pushbuttons. Frequency modulation can also be
accomplished by applying an ac voltage to the VCO
terminal. Simultaneous AM and FM is possible with the
VCO input used to vary frequency and the MOD input used
for the AM signal.
3-49. Frequency.
3-50. The frequency range of the main generator is 0.1 Hz
to 13 MHz in eight overlapping ranges. The dial accuracy is
+ 5% of full scale which means that the greatest accuracy
will be obtained at the high end of the dial. For instance, if
the dial were set to “1” on the 1 kHz range, the output
frequency would be | kHz £650 Hz. If, on the other hand,
the dial were set to “10” on the 100 Hz range, the output
frequency would be I kHz + 65 Hz.
3-51. The frequency range of the modulation generator is
0.01 Hz to 10 kHz. The RANGE Hz knob selects the upper
frequency limit and the VERNIER is used to select
frequencies within the selected range.
3-52. Amplitude.
3-53. The amplitude of the main generator can be adjusted
from 0 to 20 V p-p into an open circuit or from 0 to 10 V
p-p into 50 ohms. Amplitude of the modulation generator
is fixed at I V p-p into an open circuit, SOEPEN in SWP
operation (Paragraph 3-45).
Section HI
3-54, BASIC OPERATING PROCEDURES.
3-55. Instrument Turn-On.
a. Check the line voltage at the point of installation.
b. Refer to Figure 3-5. Set the rear panel Line Selector
switches to the setting that corresponds with the line
voltage to be used. Line voltage must be within - 10% to
+5% of the selected voltage setting. Line frequency must
be within the range of 48 Hz to 66 Hz.
Line
Voltage
Left Left
Right Left
Left Right
Right Right |
Figure 3-5, Line Selector Switches.
c. Verify that the proper fuse is installed in the rear
panel fuse holder.
| Line Setting Fuse Type -hp- Part No. f
25 A250 V Sio Blow
.125 V 250 V Slo Blow
| 100 V/120 V
| 220 V/240 V
2110-0201
2110-0318 |
d. Connect the detachable ac power cord to the rear
panel power receptacle.
e. Set the LINE switch to the ON position. The green
light will illuminate.
3-56. Fuse Replacement.
3-57. The main ac line fuse is located on the rear panel
next to the line power receptacle. Remove the line power
cord before attempting to remove the fuse. Figure 3-6
shows how to replace the fuse.
POWER CORD RECEPTACLE
— FUSE
~~ FUSE HOLDER
“FUSE RECEPTACLE
|3312AB-3975 |
Fiqure 3-6. Fuse Replacement.
3-5

HP 3312A Specifications

General

Brand	HP
Model	3312A
Category	Inverter
Language	English