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Model 8690B
Description
The Hewlett-Packard 8698B RF Unit for the HP 8690B
Sweep Oscillator covers a frequency range from 400 kHz
to 110 MHz in two ranges. The all solid-state plug-in al-
lows swept measurements to be made easier and more
accurately for the following reasons:
Sweep linearity is ±0.5% of sweep width and frequency
accuracy of the start and stop points is nominally 1% of
frequency. With the plug-in's high linearity and frequency
accuracy, the operator can use the internal graticule
markings on his oscilloscope as a frequency scale and can
then accurately define the frequency response of ampli-
fiers, filters, and other devices.
Maximum output is +13 dBm (20 milliwatts) into a 50-
ohm system. Output power is calibrated in 10 dB steps
from +13 to -110 dBm with vernier adjustment between
steps. Calibrated power makes it easier to define gain and
loss in networks and amplifiers.
A built-in leveling circuit holds the output flat within
±0.3 dB throughout the maximum sweep width, providing
accuracy in measuring a device's amplitude response.
Residual FM is less than 300 Hz on the 0.4- 11 MHz
range and less than 1 kHz on the 4- 110 MHz range, assur-
ing clean, stable displays when testing narrow band
devices.
Harmonics are at least 30 dB down and spurious re-
sponses 35 dB down over the entire frequency range.
There are many convenient sweep functions: START-
STOP, MARKER SWEEP, and
~F.
All sweeps are cali-
brated and accurate.
The 8698B can be voltage-programmed in both ampli-
tude and frequency and is capable of AM and FM.
Other significant features are a 0.4- 11 MHz auxiliary
output which allows the user to monitor frequency up to
110 MHz with an 11 MHz counter (such as the HP 5321),
a 5 MHz crystal calibrator, an uncalibrated RF output, a
sweep reference output, and a 200.4- 310 MHz VTO
output.
The HP 8698B RF Unit is all solid-state throughout, in-
corporating thin-film microcircuit amplifiers in its design.
Power consumption is thus held low and reliability high.
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