Model 8640B TM 9-4935-601-14-7&P
Table 1-1. Specifications (3 of 5)
OUTPUT CHARACTERISTICS (Cont'd)
Impedance: 50Q, ac coupled, 40 Vdc maximum,
VSWR <2.0 on 2V and 1V output ranges; <1.3 on all
other ranges.
Reverse Power: 20 dBm maximum on 2V and 1V
output ranges; 27 dBm maximum on all other
ranges.
Auxiliary Output: Rear panel BNC output is >-5 dBm
into 50Ω, source impedance is approximately 500Ω.
Leakage: (With all unused outputs terminated
properly.) Leakage limits are below those
specified in MIL-I-6181D. Furthermore, less than 3
µV is induced in a 2-turn, 1-inch diameter loop 1
inch away from any surface and measured into a
50Ω receiver. This permits receiver sensitivity
measurements to at least <0.03µV in a shielded
system.
Level Accuracy:
Using
Using Top 10 dB of Full
Vernier Range Vernier
Range
Output Level
+19 to -7 to -47 to +19 to
(dBm)
-7 -47 -137 -145
Total Accuracy
Add
as Indicated on
±1.5 dB ±2.0 dB ±2.5 dB ±0.5 dB
Level Meter
Note: Level Accuracy error consists of allowances for:
meter accuracy, detector linearity, temperature, flatness,
attenuator accuracy, and twice the measurement error. All
but the attenuator accuracy and the measurement error can
be calibrated out with a power meter at a fixed frequency
and a fixed vernier setting.
MODULATION CHARACTERISTICS
General
Types: Internal AM and FM.
External AM, FM, and PULSE.
Simultaneous AM and FM or PULSE and FM.
Internal Modulation Sources: (independently
adjustable
output is available at front panel).
Standard:
Frequency: Fixed 400 Hz and 1 kHz, +2%.
Output Level: Indicated 10 mV to 1 Vrms into 600Ω.
Optional: (Internal Variable Audio Oscillator Option
001).
Frequency: Variable 20 Hz to 600 kHz, ±10% in 5,
decade continuous bands plus fixed 400 Hz
and 1 kHz ±2%.
Output Level: 20 mV to 3V into 60012.
Total Harmonic Distortion:
<0.25%400 Hz and 1 kHz fixed tones
<0.5% 20 Hz to 2 kHz
<1.0% 2 kHz to 600 kHz
Amplitude Modulation
(AM specifications apply to the top 10 dB of output vernier range unless otherwise specified.)
Depth: 0 to 100% for output level range of +13 dBm
and below and for top 10 dB of vernier range.
1
AM Rates: INT and EXT ac; 20 Hz to AM 3 dB band-
width below. EXT dc; dc to AM 3 dB bandwidth below.
AM 3 dB Bandwidth: (See Figure 1-4).
Frequency 0 to 50 to
Bands 50% AM 90% AM
0.5 - 2 MHz 20 kHz 12.5 kHz
2 - 8 MHz 40 kHz 25 kHz
8 - 512 MHz 60 kHz 50 kHz
1
AM is possible above +13 dBm as long as the combination of the AM depth plus carrier output level does not exceed
+19 dBm.
1-10
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