HP 8642A - Mod Freq; How to Set Modulation Frequency; Mod out; How to Set Modulation Output Level

Model 864 2A/B
Description
Procedures
MOD FREQ
Operation
MODULATION OSCILLATOR
The Signal Generator's internal modulation oscillator is the modulation source for
internal AM, FM, .pM, and pulse modulation. The modulation oscillator signal is also the
source for the MOD OUTPUT connector when the modulation output level is set.
Internal modulation (such as AM, FM, .pM, and pulse modulation) is described in those
specific
operating instructions. However, the modulation frequency and the modulation
output level are discussed here.
Table 3-24. Modulation Oscillator Operating Characteristics
Electrical
Performance
Characteristics Limits
Conditions
Frequency Range 20
Hz to 100 kHz
Frequency Resolution 1 %
of setting
Frequency Accuracy
2% of setting
Output Distortion
(>0.5 Vpk) <0.02% 0.02 to 15.8 kHz
<0.15%
>15.8 kHz
Output Level Range
o to 3.3 Vpk into 600 ohms
Output Level Resolution
4mV
Output Level Accuracy
±(4% + 15 mV)
Within 1s
Output Impedance 600 ohms
±10%
Note: Put the instrument in its initialized state by selecting [ INsTR PRESET I.
How to Set Modulation Frequency
MOD OUT
[ MOD FREO ) and the value of the desired output frequency (in kHz or Hz).
The modulation frequency cannot be turned off with the ( OFF ON 1 key, but the
modulation oscillator can be considered off if the modulation output (MOD OUT) is off
and no internal modulation source is in use.
How
to Set Modulation Output Level
reu.23DEC86
The Signal Generator can be set to produce a sinewave signal at the MOD OUTPUT
connector by selecting:
MOD OUT «( SHIFT I r'( M.,..,..O""'Dco-lFR .... E""'O...-.' ) and the desired peak-voltage output level (in V or
mY).
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