Model 8640B TM 9-4935-601-14-7&P
Table 1-1. Specifications (5 of 5)
MODULATION CHARACTERISTICS (Cont'd)
Frequency Modulation (Cont'd)
Indicated FM Accuracy:
(400 Hz and 1 kHz rates using internal meter) ±10%
of meter reading (for greater than 10% of full scale).
Incidental AM: (at 400 Hz and 1 kHz rates)
<0.5% AM for FM up to 1/8 maximum allowable
deviation.
<1% AM for FM at maximum allowable deviation.
COUNTER CHARACTERISTICS
External RF Input:
Frequency Range: 1 Hz to 550 MHz.
Sensitivity: 100 mVrms, ac only, into 50Ω1 (-7
dBm).
Maximum Input: 1.3 Vrms (+15 dBm).
External Count Resolution: 6-digit LED DISPLAY
Mode Normal Expand X10 Expand X100
0 - 10 MHz 100 Hz 10 Hz 1 Hz
0 - 550 MHz 10 kHz 1 kHz 100 Hz
External Reference Input: 5 MHz, nominally >0.5 Vp-p
(5V maximum) into 1000Ω.
Internal Reference Characteristics: (after 2-hr.
warm-up)
Accuracy: (after calibration at 25°C)
Better than +1 ppm for 15 to 35°C.
Better than ±3 ppm for 0 to 55°C.
Drift Rate:
Time: <0.05 ppm per hr, <2 ppm per year.
Temperature: <2 ppm total variation for room
ambient 15 to 35°C.
Line Voltage: <0.1 ppm.
Frequency Tuning:
>±20 ppm using internal time base vernier.
Rear Output: nominally >0.5 Vp-p into 500Ω. This will
drive another 8640B.
GENERAL CHARACTERISTICS
Operating Temperature Range: 0 to 55°C.
Power Requirements: 100, 120, 220, and 240 volts,
+5%, -10%, 48 to 440 Hz; 175 VA maximum. 71/2
ft. (2,29 m) power cable furnished with mains plug to
match destination requirements.
Weight: Net, 45 lb (20,4 kg).
Dimensions:
1
1
Dimensions are for general information only. If dimensions are required for building special enclosures, contact your
HP office.
1-12
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