Audio Precision APx1701 Series, Installation Instructions Manual, Page: 29 / 44

Characteristic Specifications Supplemental Information
APx1701 Transducer Test Interface: Specifications 11
Input Impedance
4
Balanced, each side to ground ≈ 20 k Ω || 240 pF–300 pF
Unbalanced ≈ 20 k Ω || 240 pF–300 pF
Input AC Coupling
time constant ≈ 0.20 s;
–3 dB is ≈ 0.8 Hz
Switching Configuration
Microphone Output
(Pass Thru) 1
Switchable from among microphone bal-
anced inputs 1 and 2, or microphone
unbalanced inputs 1 and 2. Also switch-
able to read the DC output of either
unbalanced microphone input.
Microphone Output
(pass Thru) 2
Switchable from among microphone
balanced input 2 or microphone
unbalanced input 2 only.
Residual Noise
Determined by the audio analyzer; the
inputs are passively switched.
Input Crosstalk
(R
S
≤
600
Ω
)
≤ (–80 dB + 1 μ V) to 20 kHz
OUTPUT CURRENT SENSE (MONITOR)
Sensitivity
0.100 V per Amp, ±0.50% 0.10 Ω current sense resistor is in series
with the – (minus) Output terminal of
each amplifier.
Switching Configuration
Power amplifier output 1 or 2. Current
sense resistor remains in circuit at all
times even when not selected.