Local Operation
Rear-Panel Controls and Connectors
3
3-23
Modulation, Leveling and Frequency Pull Input Connector
The Modulation, Leveling and Frequency Pull Input Connector is a BNC connection for
applying a multifunction external control signal to the Instrument. Depending upon the
operating settings of the Instrument, the signal may be tailored for modulation control,
frequency control, or leveling control.
If AM or FM modulation is in use, this input can be used to connect an external
modulation source. In this case, the input is enabled via the
Modulation Preferences
screen and AC or DC coupling can be selected. See Table 3-3 and Table 3-4 for the input
specifications.
If Leveled Sine is in use, this input will accept a dc feedback voltage from either of the
following:
1.
An external power meter – for external leveling of the signal at the power meter
input. The feedback is compared with an internal adjustable reference voltage at the
input of an error amplifier. The Instrument output level adjusts to minimize the
difference. See Table 3-5 for the input specifications.
2.
An external phase detector and error amplifier – for phase locking the output of the
Instrument to that of another Instrument. In this case, this input is a voltage for
controlling Instrument output frequency. Output frequency can be pulled by up to ± 5
ppm, depending on sensitivity setting. See Table 3-6 for the input specifications.
W
Caution
To avoid damage to the load when using External Leveling,
ensure that the maximum output level is suitably limited via the
Leveled-Sine Preferences
screen.
W
Caution
Connections to the External Modulation, Frequency Pull and
Leveling Input Connector will often be from a grounded source
(e.g. Audio Signal generator or Power Meter). Such connection
will ground the RF Common and hence the RF Output of the
Instrument. In this circumstance, common-mode noise or
ground loops may degrade performance at very low output
levels.
Table 3-3. External Modulation Input Specifications (FM)
Parameter Specification
Comments
Connector Type
BNC
Input Referenced to RF Common (floating)
Frequency Range
DC – 300 kHz
10 Hz – 300 kHz
-3 dB Bandwidth, DC coupled
-3 dB Bandwidth, AC coupled
Sensitivity
500 Hz – 19.2 MHz/V Continuously
adjustable
Input Voltage
±2.0 V pk max.
Optimum input range ±0.25 to ±2.0 V pk,
±5 V pk absolute max.
Input Impedance
10 k
Ω
Nominal
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