Model 31A - Krohn-Hite Corporation

Model 31A - Krohn-Hite Corporation
“Quality” in Test and Measurement Since 1949
Model 31A
High-Pass Elliptical Plug-In Filter Card
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Frequency Range: 1Hz to 99kHz
Filter Type: 7-Pole, 6-Zero, Elliptical
Attenuation Slope: 115dB/Octave
Stopband Attenuation: >80dB
Selectable Input and Output Gain
Selectable Input Type: Differential and Single-Ended
DESCRIPTION
The Model 31A high-pass, elliptical filter/voltage gain amplifier
is one of many plug-in filter cards used in the Models
3905B/3905C/3916B/3916C Programmable Filter Systems
chassis.
FILTER FEATURES
As an elliptical filter, the Model 31A has a tunable cutoff
frequency range from 1Hz to 99kHz, a rolloff rate of
115dB/octave and a minimum stopband attenuation of >80dB.
Passband ripple is typically 0.22dB.
The 31A provides either a single-ended or differential input with a
common mode rejection of >60dB. Input gains up to 40dB in
10dB steps and output gains to 20dB are also provided. The 31A
will accept input signals of ±10V peak at 0dB gain and has
selectable ac or dc coupling. Overload detectors are standard and
assist the user in detecting excessive input signals or incorrect
gain settings.
AMPLIFIER FEATURES
The 31A is also a programmable voltage gain amplifier for
applications that require a low noise amplifier. The amplifier has a
bandwidth of 1MHz and gains to 60dB, selectable in 10dB steps,
and a wideband noise of <20µV.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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31AData.vp v10-13
High-Pass Elliptical Plug-In Filter Card
Model 31A
APPLICATIONS
AMPLIFIER MODE
Typical applications for the Model 31A are: removing line related
frequencies, enhancing signal-to-noise ratio, distortion testing,
low noise pre-amplification and many more. Plug-in cards
offering other types of filters with different frequency ranges,
slopes and number of channels are also available.
Bandwidth: dc coupled, dc to >1MHz min. gain, >400kHz
max. gain; ac coupled, 0.32Hz to >1MHz.
SPECIFICATIONS
Specifications apply at 25°C ±5°C.
FUNCTION: High-pass filter; voltage gain amplifier.
FILTER MODE
Insertion Loss: 0dB ±0.05dB.
Gain: 10dB to 60dB in 10dB steps ±0.1dB.
Input: Differential or single-ended +(in phase), –(inverted).
CMRR: >60dB to 10kHz; approximately 50dB at
100kHz.
Sensitivity: 10mV peak with 60dB total gain for 10V
peak output.
Type: 7-pole, 6-zero elliptical.
Maximum Input: ±10V peak at 0dB gain reduced in
proportion to gain setting.
Attenuation: 115dB/octave.
Impedance: 1M ohm in parallel with 100pf.
Passband Ripple: 0.22dB typical, 0.4dB max.
Coupling: ac or dc.
Tunable Frequency Range fc: 1Hz to 99kHz.
Maximum DC Component: ±100V in ac coupled
mode.
Frequency Resolution:
Output:
Band
Cutoff
Frequency
Range (Hz)
Resolution
(Hz)
1
1-99
1
2
100-990
10
3
1k-9.9k
100
4
10k-99k
1k
Relative Gain at fc: –0.22dB at 0.99fc nominal.
Maximum Voltage (o.c.): 7Vrms to 200kHz; 3Vrms to
500kHz; 1Vrms to 1MHz.
Impedance: 50 ohms.
DC Offset: Adjustable to zero volts.
Harmonic Distortion (1V output): <–80dB (0.01%) to
10kHz; <–60dB (0.1%) to 100kHz..
Wideband Noise (referred to input, 2MHz BW
detector): 100µV min. gain; 20µV max. gain.
DC Stability (RTI): Typically ±10µV/° C.
Cutoff Frequency Accuracy: ±2%.
Bandwidth: dc coupled, fc to upper 3dB cutoff, >500kHz at
1Vrms with 0dB gain.
Stopband Attenuation: >80dB.
Stopband Frequency (fs): 0.59fc.
Insertion Loss: 0dB ±0.1dB.
CE CERTIFICATIONS
Directive 89/336
Standard CEI EN 50081-1
Radiated Emission EN 55022 (class B)
Conducted Emission EN 55022 (class B)
Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB ±0.1dB.
Post-Filter Gain: 0dB, 10dB, 20dB ±0.1dB.
Input Coupling: ac or dc.
Wideband Noise (RTI with 2MHz BW Detector): min.
gain, 1kHz cutoff <400µV, Max fc cutoff, <1mV; Max. gain,
<20µV.
Harmonic Distortion: –80dB at 1kHz.
Spurious Components: –80dB below full scale with input
source <50 ohms.
Radiated Immunity IEC 801-3 (1984)
Electrostatic Discharge ESD IEC801-2 (1984)
Fast Transient IEC 801-4 (1984)
GENERAL
Phase Match Between Channels: 1° typical, 2° max from
1.3fc to 10fc; 2° typical, 4° max from fc to 1.3fc. For like
Models in same chassis, otherwise consult factory.
DC Stability: Typically ±10µV/°C.
Amplitude Match Between Channels: ±0.1dB typical,
±0.2dB max from fc to 1.3fc; 0.1dB max from 1.3fc to 10kHz,
0.2dB max to 100kHz.
Crosstalk Between Channels: –85dB below full scale with
input source <50 ohms.
Crosstalk Between Channels: >85dB below full scale with
input source <50 ohms.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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31AData.vp v10-13
High-Pass Elliptical Plug-In Filter Card
Model 31A
Switch: For selection of Input, +(in phase), Differential or
–(inverted).
Input/Output Connectors: BNC.
Power Requirements: 15 watts.
Weights: 1.75 lbs (.8kg).
Accessories: Operating manual.
OPTIONS
Extended 1 Year Warranty: Part No. EW31A.
NOTE: Model 31A plug-in filter/amplifier cards must be
used with 3905B/3905C or 3916B/3916C chassis.
Specifications subject to change without notice.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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31AData.vp v10-13
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