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Signal Generator Specifications
258
FM
FM Deviation:
Rates >25 Hz
100 kHz: for f
c
from 0.25 to < 249 MHz
50 kHz: for f
c
from 249 to < 501 MHz
100 kHz: for f
c
from 501 to 1000 MHz
FM not specified for (f
c
minus FM dev.) <250 kHz
FM Rate:
1 kHz reference:
Internal: DC to 25 kHz (1 dB BW)
External, AC Coupled: 20 Hz to 75 kHz (typical 3 dB BW)
External, DC Coupled: dc to 75 kHz (typical 3 dB BW)
FM Accuracy:
≤10 kHz dev, 1 kHz rate:
±7.5% of setting ±50 Hz
±3.5% of setting ±50 Hz (with HP 8920A Option 050 or HP 8920D)
>10 kHz dev, 1 kHz rate:
±7.5% of setting ±500 Hz
±3.5% of setting ±500 Hz (with HP 8920A Option 050 or HP
8920D)
FM Distortion:
THD + Noise, 0.3 to 3 kHz BW:
<1.0% at >4 kHz deviation and 1 kHz rate
<0.5% at >4 kHz deviation and 1 kHz rate (HP 8920A Option 050 or
|HP 8920D)
Center Frequency Accuracy in DC FM Mode:
External source impedance <1 kΩ:
±500 Hz (after DCFM zero) (typical ±50 Hz)
Ext. Mod. Input Impedance: 600 Ω nominal
Resolution:
50 Hz for <10 kHz deviation
500 Hz for ≥10 kHz deviation