1Hz to 99kHz
Dual Low-Pass Elliptical
GPIB/Manual
--------------------------- Tunable Active Filter
Features
Frequency
Range:
1Hz to 99kHz
Filter Type: 7-Pole, 6-Zero Elliptical
Rolloff Rate: 115dB/Octave
Differential or Single-Ended
Stopband Attenuation: >80dB
Amplifier Mode
40dB Input Gain/20dB Output Gain
Phase Match: Typically ½°
Options
Rack
Mounting Kit: Part no. RK-37, permits installation of
the Model 3900 into a standard
19" rack
spacing. Extended 1 Year Warranty: Part No. EW3900.
Related Models
>
3900
- LP - 1Hz to 99kHz - 2 Ch Elliptical 3901
- LP/HP/BP/BR - 1Hz to 99kHz - 2 Ch Elliptical 3940 -
LP/HP/BP/BR - 3Hz to 2MHz - 2 Ch Butterworth/Bessel 3944 -
LP/HP/BP/BR - 3Hz to 2MHz - 4 Ch Butterworth/Bessel 3945 -
LP/HP/BP/BR - 3Hz to 25.6MHz - 3 Ch Butterworth/Bessel 3955 -
LP - 170Hz to 25.6MHz - 2 Ch Butterworth or Bessel 3988 -
LP/HP/BP/BR - 0.03Hz to 1MHz - 2 Ch Butterworth/Bessel
INTRODUCTION
The Krohn-Hite Model 3900 programmable, dual channel
Elliptical filter/voltage gain amplifier is one
of a
family of new programmable filters from Krohn-Hite. It
was carefully designed with the user in
mind, providing
ease of operation, reliability and price competitiveness.
All backed with the quality
which Krohn-Hite has provided
in filters since 1949.
FILTER
FEATURES
As an
elliptical filter, the Model 3900 has two
independent filter channels that have a tunable cutoff
frequency range from 1Hz to 99kHz and a rolloff rate of
115dB/octave. Each filter section has a
minimum stopband
attenuation of >80dB and a passband ripple of
typically 0.22dB.
The 3900
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
3900
will accept
input signals of ±10V
peak at 0dB gain and has selectable ac or dc coupling.
The filter is
GPIB Bus
programmable and is
complimented with non-volatile memory for the storage
of
up to 99
front panel
set-ups. Overload detectors are
standard and assist the user in detecting
excessive
input
signals or
incorrect gain settings.
AMPLIFIER
FEATURES
The 3900
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
<100µV.
APPLICATIONS
Typical
applications for the Model 3900 are: anti-aliasing in
digital signal processing, separating
specific bandwidths
of information, enhancing signal-to-noise ratio, low
noise pre-amplification
and
many more. Models offering
other types of filters with different frequency ranges,
slopes and
number of channels are also available.
SPECIFICATIONS
FUNCTION:
Two independent, low-pass
filter channels or voltage gain amplifiers.
FILTER MODE
(Each Channel)
Type:
7-pole, 6-zero elliptical. Attenuation: 115dB/octave. Passband Ripple: 0.22dB typical, 0.4dB max. Tunable Frequency Range fc:
1Hz to 99kHz. Frequency Control: Keyboard entry or increment,
decrement keys. Relative Gain at fc:
–0.22dB at 1.01fc nominal. Cutoff Frequency Accuracy: ±2%. Stopband Attenuation: >80dB. Stopband Frequency (fs):
1.7fc. Insertion Loss: 0dB ±0.1dB. Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB
±0.2dB. Post-Filter Gain: 0dB, 10dB, 20dB ±0.2dB. Input Coupling: ac or dc. Bandwidth: dc coupled, dc to fc; ac
coupled, 0.32Hz to fc. Wideband Noise (RFI): min. gain, 1kHz cutoff,
<400µV, 99kHz cutoff, <1mV; Max. gain,
<20µV. Harmonic Distortion: –80dB at 1kHz. Intermodulation Distortion: –80dB below full
scale volts at 70kHz and 90kHz input frequency. Spurious Components: –80dB below full scale
with input source <50 ohms. DC Stability: Typically ±10mV/°C. Crosstalk Between Channels: –85dB below full
scale with input source <50 ohms.
AMPLIFIER MODE
(Each Channel) Bandwidth: dc coupled, dc to >1MHz min. gain,
>400kHz max. gain; ac coupled,
0.32Hz to >1MHz min
gain, >400kHz max gain.
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.
Maximum Input: ±10V peak at 0dB gain reduced in
proportion to gain setting.
Impedance: 1 megohm in parallel with 100pf.
Coupling: ac or dc.
Maximum DC Component: ±100V in ac coupled mode.
Output: 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):
150µV min. gain; 25µV max. gain.
DC Stability (RFI): Typically ±10mV/°C.
Crosstalk Between Channels: >85dB below full scale
with input source <50 ohms.
GENERAL Phase Match
Between Channels: 1° typical, 2° max from dc to
0.8fc; 2° typical,
4° max from
0.8fc
to fc. Amplitude Match Between Channels: ±0.1dB max from
dc to 0.8fc; ±0.2dB max from 0.8fc
to fc.
Memory: 99 selectable groups; memory is
non-volatile battery-backed CMOS. Overload Modes: Three selectable modes;
non-latching, that monitors all channels and displays
the first channel to have an overload; latching, that
maintains the overload display until it is cleared;
and
no indications. Overload Indicators: LEDs for input and output.
Gain display flashes when overload occurs on
displayed
channel. Input Indicators: Green LEDs to indicate active
input BNC. Self-Test Diagnostics: MPU checks unit upon
power-up. Display indicates failure mode. Displays: 7 segment, green, LED; 0.3" high. Remote Programming: IEEE-488.1 interface.
Subsets: SH1, AH1, T6, L4, SR1, RL1, PP1, DC1,
DT0,
C0
and E1. Operating Temperature: 0°C to 50°C. Isolation to Chassis: ±100Vdc. Storage Temperature: –20°C to 70°C. Input/Output Connectors: BNC, front and rear. Power Requirements: 90-132/180-264 volts ac,
50Hz-400Hz, 40 watts. Dimensions and Weights: 3.5" (9cm) high,
8.5" (21.8cm) wide, 18" (46.2cm) deep;
12 lbs
(5.4kg)
net,
14 lbs (6.3kg) shipping. Accessories: 3-terminal line cord; operating
manual.
OPTIONS Rack
Mounting Kit: Part no. RK-37, permits installation of
the Model 3900 into a standard
19" rack
spacing. Extended 1 Year Warranty: Part No. EW3900.
OPTIONAL ACCESSORIES
CAB-010:
GPIB Cable with
Connectors, 2-Meters
CAB-011:
GPIB
Cable with Connectors, 1-Meters
CAB-025:
Cable, BNC, 3ft, Low Noise
Specifications apply at 25°C ±5°C.
Specifications subject to change without notice.
