SRS Labs SR640 Series, Manual

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5
SR640 SPECIFICATIONS
GENERAL INFORMATION
The SR640 consists of two independent low-pass filter channels. Each filter is preceded by a low-noise pre-
amplifier with selectable gain of 0 to 60 dB. The filters are an 8-pole, 6-zero elliptical design with 0.1 dB maxi-
mum passband ripple and 115 dB/octave attenuation slope. A variable gain output amplifier with gains of 0dB,
10dB, and 20dB follows each filter. The filter may be bypassed to allow each channel to be used simply as an
amplifier.
The filters are controlled by a CMOS microprocessor which also handles the RS-232 and IEEE-488 interfac-
es. In addition, nonvolatile storage is provided for up to 9 complete instrument settings defined by the user.
No direct electrical connection exists between the microprocessor section of the SR640 and the filter chan-
nels. Filter and gain control is accomplished strictly through optoisolated interfaces. In addition, each chan-
nel's ground is isolated from the digital section's ground as well as from the other filter section.
Each chan-
nel's isolated ground is made available to the user on a rear-panel BNC connector to provide maximum
flexibility in connecting the SR640.
FILTER SPECIFICATIONS
Frequency Range
1Hz to 100 kHz with 3-digit resolution
Type 8-pole, 6-zero elliptic
Rolloff 115 dB/octave
Passband Ripple 0.1 dB pk-pk, typical
Stopband Attenuation 80 dB, typical
INPUT SPECIFICATIONS
Impedance
1 M
Ω
// 15 pF
Configuration Single ended (A or B) or Differential (A-B)
Common Mode Rejection >90 dB at 100 Hz
Coupling AC or DC
Input Noise 10 nV/
√
Hz at 1 kHz with 60 dB input gain
Gain 0,10,20,30,40,50,60 dB ±0.2 dB
Maximum Input Signal 10 Volts pk-pk
OUTPUT SPECIFICATIONS
Impedance
<1
Ω
Full Scale Output Signal 10 Volts pk-pk into >300
Ω
DC Offset Adjustable to 0 Volts DC
Gain 0,10,20 dB ±0.2 dB
Harmonic Distortion No greater than 80 dB below full scale at 100 Hz signal
Spurious Components No greater than 80 dB below full scale with input source <50
Ω
Crosstalk Between Channels No greater than 80 dB below full scale with input source <50
Ω
Phase Match Between Channels ±2°, DC to cutoff frequency
G E N E R A L
Interfaces
IEEE-488 and RS-232 standard. All instrument functions can be
controlled and read through the interface.
Stored Settings 9 complete 2 channel instrument configurations may be stored in
nonvolatile memory.
Power 100/120/220/240 VAC, 50/60 Hz
Dimensions 15.7"W X 3.0"H X 14.0"L
Warranty One year parts and labor on materials and workmanship
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