Model 8640B
TM 9-4935-601-14-7&P
Table 1-1. Specifications (4 of 5)
MODULATION CHARACTERISTICS (Cont'd)
Amplitude Modulation (Cont'd)
AM Distortion:
(at 400 Hz and 1 kHz rates)
Frequency
0 to
50 to
Bands
50% AM
90% AM
0.5 to 512 MHz
<1%
<3%
External AM Sensitivity:
(400 Hz and 1 kHz rates) (0.1
± 0.005)% AM per mV peak into 600
Ω
with AM
vernier at full CW position.
Indicated AM Accuracy:
(400 Hz and 1 kHz rates using
internal meter)
±8% of reading on 0 - 10 scale.
±9% of reading on 0 - 3 scale (for greater than 10%
of full scale).
Peak Incidental PM
(at 30% AM)
Less than 0.15 radians, 0.5 to 128 MHz.
Less than 0.3 radians, 128 to 512 MHz.
Peak Incidental Frequency Deviation:
Equals PEAK
INCIDENTAL PM x MODULATION RATE.
Pulse Modulation
(Specifications apply for top 10 dB of output vernier range.)
Frequency Bands (MHz)
0.5 - 1
1 - 2
2-8
8- 32
32 - 512
Rise and Fall Times
<9 µs
<4 µs
<2 µs
<1 µs
Pulse Repetition Rate
50 Hz to
50 Hz to
50 Hz to
50 Hz to
50 kHz
100 kHz
250 kHz
500 kHz
Pulse Width Minimum
for level accuracy within
10 µs
5 µs
2 µs
1 dB of CW (>0.1% duty cycle)
Pulse ON/OFF ratio at maxi-
>40 dB
mum vernier
Peak Input Required
Nom0.5V (+5V max) waveform, return to zero, into
50
Ω
Schmitt trigger.
Frequency Modulation
Deviation:
Maximum allowable deviation equals 1% of
lowest frequency in each band as below.
Frequency Band
Maximum Peak
(MHz)
Deviation (kHz)
0.5 - 1
5
1 - 2
10
2 - 4
20
4-8
40
8- 16
80
16-32
160
32-64
320
64 - 128
640
128 - 256
1280
256 - 512
2560
512- 1024
5120
FM 3 dB Bandwidth:
1
Internal and External ac; 20 Hz to 250 kHz.
External dc; dc to 250 kHz.
FM Distortion:
(at 400 Hz and 1 kHz rates) See Figure
1-6. <1% for deviations up to 1/8 maximum
allowable. <3% for maximum allowable deviation.
External FM Sensitivity:
1 volt peak yields maximum
deviation indicated on PEAK DEVIATION switch
with FM vernier at full CW position.
External FM Sensitivity Accuracy:
±6% from 15 to
35°C for FM excluding maximum peak deviation
position. Maximum peak deviation position, ±9%
typically.
1
With 86408 in, LOCKED MODE, external FM is possible only for rates greater than 50 Hz.
1-11
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