Lexicon PCM 42 - SECTION SIX SPECIFICATIONS; 6.1 General Performance Metrics; 6.2 Interface Information; INPUT TYPE AND IMPEDANCE

SECTION SIX
SPECIFICATIONS
6.0 TEST CONDITIONS
Unless otherwise stated, all measurements are per-
formed with the unit operating at room temperature, in
16 kHz mode, with the VCO-SWEEP, MANUAL control
set to XI.
Unless otherwise stated, all audio measurements are
taken with the input and output levels set as follows:
with a 1 kHz sine wave input at a level of 0 dBm, adjust
the INPUT LEVEL control for 0 dBm out from the
DIRECT OUT jack. With the OUTPUT MIX control on
the front panel set fully clockwise, adjust the OUTPUT
LEVEL control on the rear panel for 0 dBm out from the
MAIN OUTPUT jack.
6.1 GENERAL PERFORMANCE
Total Distortion and Noise
0.06% typical, 0.1% maximum @1 kHz, +9 dBm
input
0.2% typical over bandpass of 20 Hz to 15 kHz.
Frequency Response
10 Hz to 16 kHz, +0.5 dB, -3 dB in X1 mode
20 Hz to 6 kHz, +0.5 dB, -3 dB in X2 mode
Dynamic Range
Better than 90 dB, 20 Hz - 20 kHz noise band-
width.
Delay capacity
Standard Memory:
16 kHz mode:
MANUAL VCO-SWEEP = X0.5; 400 milliseconds
: = X1.5; 1200 milliseconds
6 kHz mode:
MANUAL VCO-SWEEP = X0.5; 800 milliseconds
2400 milliseconds
T
x
a
Extended Memory:
16 kHz mode:
MANUAL VCO-SWEEP = X0.5; 800 milliseconds
2400 milliseconds
ou
=
6 kHz mode:
MANUAL VCO-SWEEP = X0.5: 1600 milliseconds
4800 milliseconds
Delay selection
Two delay ranges - X1 and X2 - each providing 256
selectable delay taps. All delay taps are adjustable over
a 3 to 1 range using the VCO-SWEEP, MANUAL
control.
Delay Step Size
Evenly spaced over the selected delay range; e.g. 800
ms range, step size is approx. 3 ms.
Delay Display
Delay time is indicated by a four-digit numeric display
which tracks all delay sweeps.
Display Accuracy
Plus or minus 1 millisecond for settings up to 200 ms;
0.5% for settings between 200 ms and maximum delay.
VCO Modulation
Depth is adjustable from 0 (none) to full 3:1 sweep of
delay time. Low Frequency Oscillator rate is adjustable
from 0.1 Hz to 10 Hz and is displayed by a RATE LED
indicator.
VCO Modulation Waveform
Continuous adjustment is available between Sine
Wave and Envelope Follower or Square Wave and
Envelope Follower functions.
6.2 INTERFACE INFORMATION
input Type *
Balanced differential input, via standard 1/4” Tip/
Ring/ Sleeve phone jack, offers 40 dB common mode
rejection. Will also accept unbalanced input.
Input Impedance
Balanced or unbalanced; 40 kilohms impedance.