1-16
Frequency and Phase
[1] [2]
Modulation
Waveform
FM: Sinusoidal, or External signal
PM: Sinusoidal, or External signal
Carrier Frequency (Fc) 9 MHz to 4 GHz
Carrier Frequency Accuracy
Internal Frequency Reference: ±0.05 ppm ±240 mHz
External Frequency Reference: Ext Freq Ref Accuracy ±240 mHz
Rate (Fr) 1 Hz to 300 kHz
Rate Resolution 0.1 Hz, 5 digits
Rate Accuracy
≥1 kHz: ±1 digit, <1 kHz: ±10 mHz
Deviation (Fd)
[3]
Fc 9 MHz to 31.25 MHz FM: 10 Hz to 300 kHz PM: ≤1000 rad
Fc 31.25 MHz to 125 MHz FM: 10 Hz to 750 kHz PM: ≤1000 rad
Fc 125 MHz to 4 GHz FM: 10 Hz to 0.12 % Fc PM: ≤1000 rad or 0.12 % Fc/Fr
Deviation Resolution FM: 0.1 Hz, 5 digits. PM: 0.0001 rad, 5 digits
FM/PM Sine Deviation
Accuracy
[2]
±3 % of setting ±240 mHz.
Typically ±0.25 % of setting ±240 mHz, for ≤50 kHz rate.
FM/PM Sine Distortion
[3] [4]
≤-40 dBc (1 %) +20 dB/decade above 10 kHz (See chart).
Typically ≤-65 dBc +20 dB/decade above 1 kHz.
[1] 96270A: Modulation not available above 4 GHz. Splitter/Sensor leveling not available in Modulation functions.
[2] Internal phase modulation is generated by applying sinusoidal frequency modulation with peak deviation derived from the phase
deviation and rate settings (Fd = φd x Fr).
[3] See chart showing maximum available deviation, and maximum deviation for which deviation accuracy and distortion specifications
apply. Applies to demodulated signal content at rate frequency fundamental. Specifications are typical for modulation rates <20 Hz.
[4] Includes harmonic distortion and noise up to 5 times rate frequency.
AM External
Input
Rear-panel BNC connector (50 MHz Counter, Modulation, Leveling and Frequency Pull
Input). 10 kΩ nominal input impedance.
Bandwidth (-3 dB)
[1]
DC coupled
[2]
: dc to 220 kHz, typical. AC coupled: 10 Hz to 220 kHz, typical.
Depth Sensitivity User adjustable, 0.5 %/V to 400 %/V
Input Level ±2 V pk maximum operating, ±5 V pk absolute maximum
Carrier Level Accuracy As AM Internal Sine + 20 mV x depth/V setting, typical
Depth Accuracy
[3]
±3 % of setting ± 0.1 %, for >5 % depth, 1 Vpk input, dc or 200 Hz to 20 kHz
Residual Distortion
[4]
As AM Internal Sine, for 1 Vpk input, ≤100 kHz.
[1] Maximum input frequency 100 kHz for carrier frequency >125 MHz.
[2] DC coupled External Modulation permits dc control of carrier level or the offsetting of the modulation waveform. Note that at rates
from 0.5 Hz to 10 Hz interaction with carrier leveling may occur, resulting in modulation distortion.
[3] Applies to demodulated signal content at rate frequency fundamental.
[4] Includes harmonic distortion and noise up to 5 times rate frequency.
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