Model 8640B TM 9-4935-601-14-7&P
Table 1-1. Specifications (2 of 5)
FREQUENCY CHARACTERISTICS (Cont'd)
Restabilization Time:
Normal Locked
1
After frequency
<1 min
change
<15 min after
relocking
After band change
None to be within
0.1 ppm of
After 1 min in RF
<10 min steady-state
OFF Mode
frequency
SPECTRAL PURITY
Harmonics: (at 1 volt, +13 dBm, output range and
below)
>35 dB below fundamental of 0.5 to 128 MHz.
>30 dB below fundamental of 128 to 512 MHz.
Subharmonics and Nonharmonic Spurious:
(excluding frequencies within 15 kHz of carrier
whose effects are specified in Residual AM and
FM): >100 dB below carrier.
Noise: Averaged rms noise level below carrier stated in
a 1 Hz bandwidth.
SSB Phase Noise at 20 kHz offset from carrier.
(See Figures 1-2 and 1-3.)
256 MHz to 512 MHz: >130 dB from 230 to 450
MHz increasing linearly to >122 dB down at
550 MHz.
0.5 MHz to 256 MHz: Decreases approximately
6 dB for each divided frequency range until
it reaches SSB Broadband Noise Floor of
>140 dB.
SSB Broadband Noise Floor at maximum vernier
greater than 500 kHz offset from carrier. (See
Figures 1-2 and 1-3.) 0.5 to 512 MHz: >140 dB.
Residual AM: (Averaged rms)
Post-detection Noise Bandwidth
300 Hz to 3 kHz 20 Hz to 15 kHz
>85 dB down >78 dB down
Residual FM: (Averaged rms)
CW and up to Up to maxi-
1/8 maximum mum allowable
allowable peak peak
deviation deviation
Post-detection
300 Hz 20 Hz 300 Hz 20 Hz
Noise
to to to to
Bandwidth
3 kHz 15 kHz 3 kHz 15 kHz
230 to 550 MHz
<5 Hz <15 Hz <15 Hz <30 Hz
Note: Residual FM decreases by approximately 1/2 for
each divided frequency range until limited by broadband
noise floor. This limit for 300 Hz to 3 kHz is about 1 Hz,
and for 20 Hz to 15 kHz is about 4 Hz. These are
measured values in the 230 to 550 MHz range and
calculated for divided ranges, knowing the noise
distribution.
OUTPUT CHARACTERISTICS
Range: 10 dB steps and 18 dB vernier provide output
power settings from +19 to -145 dBm (2V to 0.013µ)
into 50Ω.
Level Flatness: <±0.5 dB from 0.5 to 512 MHz referred
to output at 50 MHz. (Flatness applies to +13 to -7
dBm and for top 10 dB of vernier range.)
1
These specifications are given for the 8640B internal reference. When using an external reference, drift in the
locked mode will depend on the external reference characteristics.
1-9
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