Krohn-Hite 3945 Datasheet
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“Quality” in Test and Measurement Since 1949
DC Source/Calibrators, Tunable Electronic Filters,
Wideband Power Amplifiers
Precision Phasemeters, Distortion Analyzers
Function Generators, RC Oscillators
Model 3945
3Hz to 25.6MHz, High-Pass/Low-Pass
Butterworth/Bessel Programmable Filter
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3 Independent Channels
Frequency Range: 3Hz to 25.6MHz
Response: Bessel/Butterworth
Attenuation Slope: 24dB/OctaveInput/Output Gain
Noise: Typically <250µV referred to input
Remote Control: GPIB
By-Pass Mode
DESCRIPTION
The Krohn-Hite Model 3945 programmable filter provides one
Butterworth channel of low-pass, tunable over the range from
170Hz to 25.6MHz; and two independent Butterworth or Bessel
channels of low-pass, high-pass or bypass, one channel of
band-pass or band-reject, tunable over the range from 3Hz to
2MHz.
The 3945 has been specifically designed for applications
requiring high frequency band-pass filtering. The high cutoff may
be set to any frequency between 170Hz and 10MHz, and the lower
cutoff to any frequency between 3Hz and 2MHz.
transfer functions and can be programmed to operate as two
low-pass, high-pass, one band-pass or band-reject filter with gains
to 40dB per channel.
NON-VOLATILE MEMORY
The 3945 offers 99 groups of non-volatile memory for storage of
front panel set-ups, which are stored in battery-backed CMOS.
Set-ups can be recalled with a simple command. Self-test
diagnostics occur upon power-up insuring that all internal
memory is operating properly. If a failure occurs, the display will
indicate which ROM or RAM has failed.
50MHz LOW-NOISE AMPLIFIER
APPLICATIONS
One channel of the 3945 can operate as a low-noise amplifier,
bypassing the filter, delivering a bandwidth of 50MHz and gains
up to 46dB. This is useful to users wanting to increase the gain of
the signal and improve signal-to-noise ratio before filtering. The
other two channels of the 3945 furnish Bessel or Butterworth
The 3945 can provide filtering for many applications such as: high
frequency anti-aliasing for digital signal processing, EMI testing,
video recording and many more. The Model 3945 has been
carefully designed with the user in mind, providing ease of
operation, reliability and price competitiveness.
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Page 1 of 4
3945Data.vp
3Hz to 25.6MHz Butterworth/Bessel Programmable Filter
Model 3945
SPECIFICATIONS
CHANNEL 2.1 FILTER CHARACTERISTICS
Specifications apply at 25°C ±10°C.
Filter Type: 4-Pole, Butterworth, low-pass.
FUNCTION
Attenuation Slope: 24dB/Octave.
Channel 1.1 and 1.2: Two independent channels of
low-pass, high-pass or bypass; one channel of band-pass
or band-reject.
Tunable Cutoff Frequency Range: 170Hz to 25.6MHz.
Channel 2.1: One low-pass filter channel or amplified
bypass.
CHANNELS 1.1 AND 1.2 FILTER CHARACTERISTICS
Type: 4-pole Butterworth (maximally flat) or Bessel (linear
phase).
Attenuation Slope: 24dB/octave per channel.
Tunable Frequency Range (fc): 3Hz to 2MHz.
Frequency Resolution: 1Hz from 3Hz to 1kHz; 10Hz to
2kHz; 100Hz to 100kHz; 1kHz to 1MHz; 10kHz to 2MHz.
Cutoff Frequency Accuracy (fc): ±2% or least significant
digit (which ever is greater) 20Hz to 500kHz; ±5% to 2MHz.
Relative Gain at fc: Butterworth, –3dB; Bessel, –7.58dB.
Bandwidth: dc to fc, dc coupled; 0.2Hz to fc, ac coupled
(low-pass); fc to 10MHz (high-pass).
Passband Response (0dB, Input/ Output gain): ±0.5dB
to 2MHz.
Stopband Attenuation: >80dB.
Harmonic Distortion: –80dB at 1kHz at 1Vrms.
Frequency Resolution: 10Hz from 170Hz to 2.56kHz;
100Hz from 2.6kHz to 25.6kHz; 1kHz from 26kHz to
256kHz; 10kHz from 260kHz to 2.56MHz; 100kHz from
2.6MHz to 25.6MHz.
Cutoff Frequency Accuracy: ±2% to 2.56MHz, ±5% to
25.6MHz.
Passband Response: ±0.2dB up to 2.56MHz, ±0.5dB to
25.6MHz.
Stopband Attenuation: -100dB to 1MHz; -75dB at 10MHz;
-55dB at 30MHz; -50dB at 50MHz; -40dB to 100MHz.
Input/Output Coupling: AC or DC. AC coupling cutoff is
approximately 16Hz at the input and 10Hz at the output with
a 50W termination. Note that the internal 50W input
termination is before the AC coupling.
Noise Spectral Density (10kHz to 100MHz referred to
input): Below –128dBm/Hz into 50 ohms.
This translates into a wideband noise power or voltage for a
30MHz BW of below –53dBm or 500µVrms referred to input.
Harmonic Distortion (1Vrms sinewave): >–60dB below
signal up to 100kHz (0.1%). All harmonics below 50dB to
1MHz; below 40dB above 1MHz.
Noise (referred to input): <200µV with 2MHz bandwidth
detector.
Spurious Signals: Below –80dBm to 65MHz; below
–75dBm to 100MHz. Referred to input represented in
voltage form: 22mV and 40mV respectively.
Input:
DC Stability: ±0.5mV/°C referred to input.
Pre-Filter Gain: 0dB or 20dB; ±0.2dB.
Input:
Coupling: ac or dc.
Pre-Filter Gain: 0dB, +10dB, +20dB; ±0.1dB.
Impedance: 1M ohm in parallel with 100pf.
Impedance: Selectable 1M ohms or 50 ohms, ±2%,
shunted by 65pF.
Maximum Signal (at 0dB gain): ±4.5V peak at fc
<1MHz; ±4V peak at 2MHz.
Maximum DC Blocking Voltage: ±200V in ac
coupled mode.
Output:
Post-Filter Gain: 0dB or 20dB; ±0.2dB.
Impedance: 50 ohms.
Maximum Voltage: ±6.5V peak into ³500 ohms;
±1.3V peak into ³50 ohms.
Maximum Signal: ±1.5V peak with 0dB input gain,
reduced in proportion to input gain selected.
Maximum Input Without Damage: 12Vrms with input
terminator OFF, 7Vrms with input terminator ON.
Maximum DC Blocking Voltage: 200V. Note that the
internal input termination is before the AC coupling
and can only tolerate 7Vrms when ON.
Output:
Post-Filter Gain: 0dB, +6dB, +20dB, +26dB; ±0.1dB.
Maximum Current: ±25mA.
Impedance: 50 ohms, ±2%.
DC Level: Adjustable to zero.
Maximum Signal: ±3V peak open circuit; ±1.5V peak
into 50 ohms.
DC Stability: ±0.5mV/°C typical; ±1mV/°C max.
DC Level: Adjustable to Zero.
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Page 2 of 4
3945Data.vp
3Hz to 25.6MHz Butterworth/Bessel Programmable Filter
Model 3945
AMPLIFIER MODE CHARACTERISTICS
(Channel 2.1 only)
Bandwidth: >50MHz.
Input:
Pre-Filter Gain: 0dB, +10dB, +20dB; ±0.1dB.
Impedance: Selectable 1M ohm or 50 ohms, ±2%,
shunted by 65pF.
Maximum Signal: ±1.5V peak with 0dB input gain,
reduced in proportion to input gain selected.
Maximum Input Without Damage: 12Vrms with input
terminator OFF, 7Vrms with input terminator ON.
Maximum DC Blocking Voltage: 200V. Note that the
internal input termination is before the AC coupling
and can only tolerate 7Vrms when ON.
Channels 1.1 and 1.2 Group Delay
Output:
Post-Filter Gain: 0dB, +6dB, +20dB, +26dB; ±0.1dB.
Impedance: 50 ohms, ±2%.
Maximum Signal: ±3V peak open circuit; ±1.5V peak
into 50 ohms.
DC Level: Adjustable to Zero.
Rise and Fall Time: <7ns with 0dB input gain 6dB
output gain; <10ns with +20dB input or output gain;
<5% ringing or overshoot.
GENERAL
Frequency Control: Keypad entry or increment, decrement
keys.
Memory: 99 selectable groups; memory is non-volatile
battery-backed CMOS.
Overload Modes (Channel 2.1 only): 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.
Channels 1.1 and 1.2 Phase Response
Overload Indicators (Channel 2.1 only): LEDs for input
and output. Gain display flashes when overload occurs on
displayed channel.
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, E1.
Operating Temperature: 0°C to 50°C.
Isolation to Chassis: ±200Vdc.
Storage Temperature: –20°C to 70°C.
Channels 1.1 and 1.2 Transient Response
Input/Output Connectors: BNC, front and rear.
Power Requirements:
50Hz-400Hz, 35 watts.
90-132/180-264
volts
ac,
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Page 3 of 4
3945AData.vp
3Hz to 25.6MHz Butterworth/Bessel Programmable Filter
Dimensions: 3.5" (9cm) high, 8.5" (21.8cm) wide, 18"
(46.2cm) deep.
Weights: 12 lbs (5.4kg) net; 14 lbs (6.3kg) shipping.
Accessories: 6 foot, 3 terminal line cord, operating manual.
Model 3945
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
HIGH FREQUENCY BAND-PASS OPERATION
OPTIONS
020: Lower frequency cutoff range to 0.3Hz to 200kHz for
channels 1 and 2 only.
Rack Mount Kit: Part No. RK-37, permits installation of the
Model 3945 into a standard 19" rack spacing.
Extended 1 Year Warranty: Part No. EW3945.
Connecting the output of channel 1.1 or 1.2 (set to
high-pass) to the input of channel 2.1 (set to low-pass, 50
ohm input impedance, 6dB output gain), provides a
band-pass filter with 0dB insertion loss and the low-cutoff
adjustable between 3Hz and 2MHz, and the high-cutoff
adjustable between 170Hz and 10MHz. At high-cutoff
settings above 10MHz, the passband response will
deteriorate.
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Page 4 of 4
3945Data.doc
Artisan Technology Group is your source for quality
new and certified-used/pre-owned equipment
• FAST SHIPPING AND
DELIVERY
• TENS OF THOUSANDS OF
IN-STOCK ITEMS
• EQUIPMENT DEMOS
• HUNDREDS OF
MANUFACTURERS
SUPPORTED
• LEASING/MONTHLY
RENTALS
• ITAR CERTIFIED
SECURE ASSET SOLUTIONS
SERVICE CENTER REPAIRS
Experienced engineers and technicians on staff
at our full-service, in-house repair center
WE BUY USED EQUIPMENT
Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins
www.artisantg.com/WeBuyEquipment
InstraView REMOTE INSPECTION
LOOKING FOR MORE INFORMATION?
Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical
specifications, manuals, and documentation
SM
Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com
Contact us: (888) 88-SOURCE | sales@artisantg.com | www.artisantg.com
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