Operating Instructions; Frequency; Amplitude; Leveling - HP 3320A Operating And Service Manual

Model 3320A/B
Section III
SECTI 0 N III
OPERATING INSTRUCTIONS
3·1. INTRODUCTION.
3-2. This section contains information necessary for opera-
tion of the ·hp- Model 3320A/B Frequency Synthesizer.
Included are descriptions and identification of front and
rear panel controls, indicators and connectors, operating
instructions, and remote programming information.
3·3. CONTROLS. INDICATORS
and
CONNECTORS.
34. A brief description of each control, indicator and
connector is given in Figure 3-1. Controls, indicators and
connectors requiring additional information are referenced
to descriptive paragraphs within this section.
3·5. FRONT PANEL OPERATION.
3-6. The following paragraphs contain information for
setting frequency, amplitude and leveling. Also included is
information on remote programming and input/output
connectors.
3·7.
Frequency.
3-8. The 3320A/B provides five digits of frequency resolu-
tion plus an overrange digit. The frequency is determined
by the position of the RANGE control, the two Vernier
controls (VERN IN/VERN OUT and vernier frequency).
and the three FREQUENCY controls. Thc three FRE-
QUENCY controls set the three most significant digits and
the overrange digit. The RANGE control places the decimal
point. The vernier controls allow the operator to adjust two
additional digits of frequency from 00 to 99. When the
vernier control is in the
VERN OUT
position. these
additional digits are always 00. Table 3-1 shows the control
settings for maximum output in each of the five range
positions.
0- 13 dB porentiometer. Maximum output voltage for the
3320A is I V rms into 50 ohms or 2 V rms open circuit.
3-1 I. The 3320B output amplitude is adjusted by four
front panel AMPLITUDE controls. Output levels from
+26.99 dBm to -69.99 dBm with a resolution of 0.01 dB
are obtainable. Each amplitude control operates indepen-
dently, allowing changes of 0.01 dB. 0.1 dB, I dB or 10 dB
in the output level. Maximum output voltage is 5 V rms
into 50 ohms or 10 V
nTIS
open circuit.
3-12. Leveling.
3-13. The 3320B frequency response is determined by the
position of the LEVELING control. For frequencies below
10Hz, the LEVELING control should be in the OFF
position. This prevents the thermopile in the leveling loop
from responding to the instantaneous value of the output
sinewave. For frequencies above 10Hz, the thermopile will
respond only to the true rros value of the output frequency,
therefore, the LEVELING control should be in the ON
(>
10Hz) position.
3-14. REMOTE BCD PROGRAMMING.
3-15. The 3320A Option 003 and 3320B Option 004 can
be remotely programmed with an 8-4-2-1 BCD code. All
functions of the 3320A can be programmed with the
exception of amplitude, the last vernier digit, and the
power switch. All functions of the 3320B can be program-
med with the exception of the last vernier digit and the
power switch. There is no internal storage capability,
therefore, the program lines must be held until the program
is changed. Figure 3-2 shows the BCD input connector and
the signal inputs for each pin. Paragraphs 3-16 through 3-33
explain each input/output signal. logiC levels for the BCD
input/outputs are as follows:
3-16. Remote Enable.
3-17. The signal input labeled REN controls the remote/
local mode of operation (REN LOW
=
remote, REN HIGH
=
local). When the 3320A/B is programmed to the remote
mode, the front panel controls have no effect.
Table 3-1. Frequency Control Settings_
Range
Frequency Digits Verniet'" Digits
(MAX)
(MAX)
Hz
1299.
99
kHz
12.99 99
kHz 129.9 99
kHz
1299. 99
MHz
12.99 99
3-9. Amplitude.
3-10. The 3320A output amplitude is adjusted by a
State
L LOW (logical" I ")
H HIGH (logical "0")
Requirements
o
V to 0.4 V (5 rnA
max.) or contact clo-
sure to ground through
<80 ohms.
+ 2.4 V to + 5 V or re-
moval of contact clo-
sure to ground.
3·1