company logo BK 4084 20 MHz
Programmable DDS Function Generator
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BK 4084 20 MHz
Programmable DDS Function Generator



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BK 4084

Features:
  • Frequency range of 1µHz to 20MHz for sine and square
  • Clean and stable output of very small signals down to the 1mV
  • 10mV range (50 ohm)
  • Support of internal and external modulation sources as well as internal, external and gated trigger sources
  • Convenient data input via numeric keypad or knob.
  • Adjust modulation parameters precisely and over a wide range
  • Fully programmable via the standard RS232 interface using SCPI compatible commands.
  • 100 MHz Universal Counter with frequency measurement and totalize function




  Description

Model 4084 is a versatile, laboratory grade synthesized function generator. Direct digital synthesis (DDS) techniques are used to create stable, accurate output signals for all 27 built-in standard and complex (arbitrary) waveforms. The generator produces high purity, low distortion sine waves and provides a full suite of analog modulation capabilities including AM, FM, FSK, PSK, pulse modulation, burst mode and linear/logarithmic sweep combined with multiple trigger modes. The 4084’s versatility and capabilities make it an ideal tool for many general-purpose test and bench applications or for use in Training and Education.



  Models, Options, & Accessories


Model Description List Price Sale Price
4084 20 MHz Programmable DDS Function Generator
$925.00 
4085 40 MHz Programmable DDS Function Generator
$1150.00 
4086 80 MHz Programmable DDS Function Generator
$1375.00 
4087 120 MHz Programmable DDS Function Generator
$1650.00 
Model Accessories List Price Sale Price
CC-150 BNC to BNC, RG/58U, 48"
$10.40 
CC-155 BNC to BNC, RG/58U, 60" - Discontinued - suggested replacement: Cal Test CT2942-150
TLFG Function Generator Test Leads Set
$82.00 



  Specifications

Frequency Characteristics
Sine 1μHz ~ 20MHz
Square 1μHz ~ 20MHz
All Other waveforms 1μHz ~ 100kHz
Frequency Stability ±1x10-6 (22°C ±5°C)
Resolution 1μHz
Accuracy ≤ ± 5x10-6 (22°C ±5°C)
Data entry Units s, ms, Hz, kHz, MHz
Waveform Characteristics
Main Waveforms (Sine, Square)
Amplitude resolution 12 bits
Sample Rate 200MSa/s
Sine
Harmonic Distortion of Sine Wave* ≤ - 50dBc (frequency ≤ 5MHz)
≤ - 45dBc (frequency ≤ 10MHz)
≤ - 40dBc (frequency ≤ 20MHz)
≤ - 35dBc (frequency ≤ 40MHz)
≤ - 30dBc (frequency > 40MHz)
THD* 0.1% (20Hz ~ 100kHz)
Square
Rise and fall time* ≤ 15ns
* = Note Test conditions for harmonic distortion, sine distortion, rise/fall time Output Amplitude 2Vp-p, Environmental temperature: 25°C±5°C
Arbitrary
Non volatile memory 8 waveforms
Waveform length 8~16000 points
Amplitude resolution 10 bits
Frequency range 1μHz~100kHz
Sample rate 200MSa/s
Others built-in waveforms
27 build-in standard and complex waveforms Sine, Square, Triangle, Positive Ramp, Falling Ramp, Noise, Pulse, Positive Pulse, Negative Pulse, Positive DC, Negative DC, Stair wave, Coded Pulse, Full wave rectified, Half-wave rectified, Sine transverse cut, Sine vertical cut, Sine phase modulation, Logarithmic, Exponential, Half-round, Sinx/x, Square root, Tangent, Cardiac, Earthquake, Combination
Waveform Length 4096 dots
Amplitude Resolution 10 bits
Pulse
Duty Cycle 0.1% ~ 99.9% (below 10kHz)
1% ~ 99% (10kHz ~ 100kHz)
Rise/Fall Time ≤ 100ns (Duty Cycle 20%)
DC signal characteristics
DC range ≤ 10mV – 10V (high impedance)
DC Accuracy ≤ ±5% of setting +10mV (high impedance)
Amplitude Characteristics
Amplitude Range Freq ≤ 40MHz: 2mV ~ 20Vpp (open circuit) , 1mV ~ 10Vpp (50Ω)
Freq > 40MHz: 2mV ~ 4Vp-p (open circuit), 1mV ~ 2Vpp (50Ω)
Resolution 2μVpp (open circuit), 1μVpp (50Ω)
Accuracy ± 1%+0.2mV (sine wave relative to 1kHz)
Stability ±0.5 % /3 hours
Flatness
For amplitude ≤ 2Vpp ±3% (freq≤ 5MHz), ±10% (5MHz
For amplitude >2Vpp: ±5% (freq≤ 5MHz), ±10% (5MHz±20% (frequency>20MHz)
±1dBm (frequency>40MHz)
Output Impedance 50Ω
Output Units Vpp, mVpp, Vrms, mVrms, dBm
DC Offset Characteristics
Offset Range (open circuit) Freq ≤ 40MHz): ±10Vpk ac+dc (Offset ≤ 2 x pk - pk amplitude)
Freq > 40MHz): ±2Vpk ac+dc (Offset ≤ 2 x pk - pk amplitude)
Offset Resolution 2μV (open circuit), 1μV (50Ω)
Offset Error ±5% of setting +10mV (Ampl. ≤ 2Vpp into open circuit)
±5% of setting +20mV (Ampl. > 2Vpp into open circuit)
Modulation
AM Characteristics
Carrier Waveforms Sine or Square
Modulation Source Internal or external
Internal Modulating Waveform Sine, Square, Triangle, Rising/Falling Ramp
Frequency of modulating signal 100μHz ~ 20kHz
Distortion ≤ 2%
Modulation Depth 1% ~ 120%, 1% ~ 80% (frequency>40MHz
Ampl > 2Vpp into open circuit)
Modulation Error ± 5%+0.2% (100μHz < frequency ≤ 10kHz)
±10%+2% (10kHz < frequency ≤ 20kHz)
Max. Amplitude of ext. input signal 3Vp-p (-1.5V~ +1.5V)
FM Characteristics
Carrier Waveforms Sine or Square
Modulation Source Internal or external
Internal Modulating Waveform Sine, Square, Triangle, Rising/Falling Ramp
Frequency of modulating signal 100μHz ~ 10kHz
Deviation Max. 50% of carrier frequency for internal FM
Max 100kHz (carrier frequency≥ 5MHz) for external
FM, with input signal voltage 3Vp-p (-1.5V~+1.5V)
FSK Characteristics
Carrier Waveform Sine or Square
Control ModeI Internal or external trigger (external: TTL level, low level F1, high level F2)
FSK Rate 0.1ms ~ 800s
PSK Characteristics
Carrier Waveform Sine or Square
PSK Phase 1 (P1) and Phase 2 (P2), range: 0.0 ~ 360.0°
Resolution 0.1°
PSK rate 0.1ms ~ 800s
Control Mode Internal or external trigger (external: TTL level, low level P1, high level P2)
Burst Characteristics
Waveform Sine or Square
Burst Counts 1 ~ 10000 cycles
Time interval between bursts 0.1ms ~ 800s
Control Mode Internal, single or external gated trigger
Frequency Sweep Characteristics
Waveform Sine or Square
Sweep Time 1ms ~ 800s (linear), 100ms ~ 800s (log)
Sweep Mode Linear or Logarithmic
Start/ Stop Frequency Same as frequency range of Sine & Square
External trigger signal frequency DC ~ 1kHz (linear) DC~10Hz (log)
Control Mode Internal or external trigger
Inputs/ Outputs
Main Output
Impedance 50Ω
Protection Short circuit and overload protected
Output MOD OUT
Frequency 100Hz ~ 20kHz
Waveform Sine, Square, Triangle, Rising/Falling Ramp
Amplitude 5Vp-p ± 5%
Output Impedance 600Ω
Modulation IN 3Vpp = 100% Modulation
External Input Trig/FSK/Burst Level - TTL
Universal Counter, Key Specs*
Frequency Range
Frequency Measurement 1Hz ~ 100MHz
Totalize mode 50MHz max
* For the full specification of the counter section refer to www.bkprecision.com
General
Power Supply 198~242V or 99~121V, Frequency: 47~ 63Hz
Power Consumption <35VA
State Storage Memory
Storage Parameters frequency, amplitude, waveform, DC offset values, modulation parameters
Storage Capacity 10 user configurable stored states
Dimensions (W x H x D) 10” x 3.93” x 14.56” (255 mm x 100 mm x 370 mm)
Weight 6.6lbs (3 kg)
Remote Interface RS232
Safety designed according to EN61010
EMC tested according to EN55022, EN55024, EN61326, EN601000
Accessories
Included BNC to alligator cable, BNC to BNC cable, RS232 communication cable, power line cord, test report, spare fuse




 

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