3900 Platform Specifications
Subject to Export Control, see Cover Page for details.
B-9
Audio & Modulation Measurements
AF Counter
Frequency Range
20 Hz to 20 kHz (usable from 10 Hz)
Resolution
0.1 Hz
Accuracy
±50 ppm max, ±10 ppm Typical
Waveshape
Sine or Square
Input Level Range
3901 / 3902
10 mV to 8 Vrms
3902
10 mV to 30 Vrms
Front Panel Inputs
Audio 1 or 2
Unbalanced, Chassis reference
Audio 1 and 2
Balanced, 600 Ω differential input
Impedance
Hi-Z (> 10 k Ω) Unbalanced input
600 Ω Unbalanced input (8 Vrms Maximum input*)
600 Ω Balanced input
*600 Ω Unbalanced input auto-switches to Hi-Z @ 8 Vrms (3920 only)
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