BK Precision BK Precision 4085 Manual

INSTRUCTION

MANUAL

4080 Series

Function and Arbitrary/Function Generators

Model 4084AWG, 4086AWG, 4084, 4085, 4086, 4087

99 Washington Street
Melrose, MA 02176
Fax [phone]
TestEquipmentDepot.com

4080 series Arbitrary/Function Generator with Counter –Instruction Manual

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Safety Summary

The following safety precautions apply to both operating and maintenance personnel and must be
observed during all phases of operation, service, and repair of this instrument. Before applying power,
follow the installation instruc tions and become familiar with the operating instruc tions for this
instrument.

Failure to comply with these precautions or with specific warnings elsewhere in this manual violates
safety standards of design, manufacture, and intended use of the instrum ent. B&K Precision Corpor ation
assumes no liability for a customer’s failure to comply with these requirements. This is a Safety Class I
instrument.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and c abinet must be connecte d to an electrical groun d.
This instrument is grounded through the ground conductor of the supplied, three-conduct or ac power
cable. The power cable must be plugged into an appr oved three-con ductor elec trical outlet. D o not alter
the ground connection. Without the protective ground connect ion, all acc essible con duc tive parts
(including control knobs) can render an elect r ic shock. The power jack and mating plug of the power
cable meet IEC safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical
instrument in such an environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUITS

Instrument covers must not be removed by operating personnel. Component replacement and interna l
adjustments must be made by qualified maintenance personnel. Discon ne ct the power cord before
removing the instrument covers and replacing components. Under certain conditions, even with the
power cable removed, dangerous voltages may exist. To avoid i njuries, always disconnect power and
discharge circuits before touching them.

WARNINGS AND CAUT I O N S

WARNING and CAUTION statements denote a hazard. Follow all instructions contained in these

statements.
A WARNING statement calls attention to an operating procedure, practice, or conditi on, whic h, if not

followed correctly, could result in injury or death to personnel.
A CAUTION statement calls attention to an operating procedure, practice, or condition, which, if not

followed correctly, could result in damage to or destruction of part or all of the product.

WARNING:

WARNING:

CAUTION:

Do not alter the ground connection. Without the protective groun
connection, all accessible conductive parts (including control knobs) can
render an electric shock. The power jack and mating plug of the powe
cable meet IEC safety standards.

To avoid electrical shock hazard, disconnect power cord before removin
covers. Refer servicin g to qualified personnel.

Before connecting the line cord to the AC mains, check the rear panel A
line voltage indicator. Applying a line voltage other than the indicate
voltage can destroy the AC line fuses. For continued fire protection, replace
fuses only with those of the specified voltage and current ratings.

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

Table of Contents

1. PRODUCT INTRODUCTION................................................................................................5

1.1 Description .......................................................... .............................. ...............................5

1.2 Key features..................... ... .. ... .. ............................ ... .. ... .. ... ..............................................5

2. SPECIFICATIONS..................................................................................................................6

2.1 Function Generator... .. ... .. ........................................................ .. ... .. ... ............................. ..6

2.2 Universal Counter .. ...........................................................................................................9

2.3 General ... ............................ .. ... .. ... ....................................................................................10

3. PANEL DESCRIPTION..........................................................................................................11

3.1 Front Panel.................. ... .. ... ..............................................................................................11

3.1.1 Overview of Keys ....................................................................................................11

3.1.2 Display Annunciators..................... ... .. ... .. ............................ .. ... .. ... ..........................12

3.1.3 Description of front panel keys................................................................................13

3.1.3 Description of menu parameters ........................... .. ... .. ... .........................................14

3.2 Rear Panel.............. ............................... .......................................................... ..................17

4. OPERATING INSTRUCTIONS.................. ............................................................................18

4.1 Installation.................................... .............................. ............................... .......................18

4.2 Main operating modes............................ ... .............................. .............................. ...........18

4.3 W aveform Selection..........................................................................................................19

4.4 Data entry .........................................................................................................................20

4.5 Output Configuration..... .. ............................ ... .. ... ........................... ... .. ... ..........................21

4.5.1 Set Frequency and Period.........................................................................................21

4.5.2 Set Amplitude...........................................................................................................21

4.5.3 Set DC Offset Voltage..............................................................................................22

4.5.4 Adjust duty cycle......................................................................................................22

4.5.5 Sync/TTL Signal......................................................................................................23

4.5.6 Signal Store and Recall ............................................................................................23

4.6 Set Modulation and Sweep Parameters ............................................................................24

4.6.1. Sweep mode............................................................................................................24

4.6.2 FM modulation.........................................................................................................26

4.6.3 AM modulation ........................................................................................................27

4.6.4 Burst modulation......................................................................................................28

4.6.5 FSK modulation.......................................................................................................30

4.6.6 PSK modulation.......................................................................................................31

4.7 Set System Parameters............................... .. .............................. ... .. ... .............................. .32

4.8 Universal Counter .. ...........................................................................................................34

5. REMOTE INTERFACE REFERENCE...................................................................................35

5.1 Introduction ........... ...........................................................................................................35

5.2 Overview and syntax of SCPI instructions.......................................................................35

5.3 Detailed description of SCPI Instructions ........................................................................39

6. USER PROGRAMMABLE ARBITRARY WAVEFORM MODULE ............... ... .. ... .. ... ........47

7. APPENDIX..............................................................................................................................57

A) Declaration of conformity .......................... .. .............................. ... .............................. ... .. .58

B) Service and Warranty Information.....................................................................................57

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

1. PRODUCT INTRODUCTION

1.1 Description

The B+K Precision 4080 Series are laboratory grade synthesized function generators with a wide
frequency range of up to 120 MHz. Direct digital synthesis (DDS) techniques are used to create
stable, accurate output signals fo r clean, low distortion sine waves and an extensive selection of
built-in standard and arbitrary waveform s. The ins tr ument supports AM, FM, FSK, PSK and pu lse
modulation and linear and logarithmic sweep. Modulation parameters can be set precisely and are
adjustable over a wide range. Th e 4080 Series supports internal an d externa l modulat ion sources as
well as internal, external and gated trigger sources.

All models are capable of generating complex, predefined arbitrary waveforms. Additionally,
models 4084AWG and 4086AWG provide the flexibility to create custom waveforms. The AWG
module includes an intuitive, graphical Windows based software tool for creating and editing
custom arbitrary waveforms and transferring the waveforms to the instrument’s non-volatile
memory. The software also provides a direct interface to Tektronix® TDS1000, TDS2000
TPS2000 and TDS3000 series digital storage oscilloscopes offering users a convenient means to
recreate waveforms originating from the DSO’s display or internal memory.

The 4080 Series front-panel operation is straightforward. Parameters can be entered using the knob
or directly via the numerical keypad and unit keys.

The instruments are fully programmable via the standard RS232 interface. The command set is
SCPI (standard Commands for Prog rammable Instruments) compatible.

The combination of classical function and arbitrary waveform generator makes this series a versatile
solution for many applications in Electronic Test and Design, Sensor Simulation, Education and
Training.

1.2 Features

• Direct Digital Synthesis (DDS) architecture

• Wide frequency range of 1µHz ~ 120MHz (model 4087, sine wave only)

• Clean and stable output of very small signals down to 1mV (50)

• 27 build-in standard and complex waveforms.

• Eight downloadable 16000 point memories for custom arbitrary waveforms (models

4084AWG and 4086AWG only)

• Graphical Arbitrary Waveform Generation Software tool for Microsoft

(models 4084AWG and 4086AWG only)

• Convenient data input via knob or numerical keypad.

• Bright, easy to read display using VFD (Visible Vacuum Fluorescent) technology

• Fully programmable via SCPI compatible command set

• 100 MHz Universal Counter with frequency measurement and totalize function

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

5

®

WindowsTM

4080 series Arbitrary/Function Generator with Counter –Instruction Manual

2. SPECIFICATIONS

2.1 Function Generator

Waveform Characteristics

Main Waveforms

W aveform Am plitude resolution: 12 bits
Sample Rate: 200MSa/s (4084, 4084AWG, 4085, 4086, 4086AWG)

Sine

:

Square

Rise and Fall Time of Square Wave: 15ns

Note: Test conditions for harmonic distortion, sine distortion, rise/fall time: Output
Amplitude 2Vp-p, Environmental temperature: 25℃±5℃

Build in standard and complex (arbitrary) waveforms
27 build-in standard and complex waveforms.

Waveform Length: 4096 dots

Amplitude Resolution: 10 bits

Pulse W ave :

DC signal characteristics:

Module for user defined arbitrary waveform generation (models 4084AWG and 4086AWG only)

Number of memory locations for arbitrary waveforms: 8
Length of waveforms：8~16 000 points
Resolution of wavefo rm a m p litude：10 bits
Frequency range：100µHz~100kHz
Sample rate：200MSa/s

: Sine, square

300MSa/s (4087)

Harmonic Distortion of Sine Wave:

 - 50dBc (frequency  5MHz)
 - 45dBc (frequency  10MHz)
 - 40dBc (frequency  20MHz)
 - 35dBc (frequency  40MHz)
 - 30dBc (frequency > 40MHz)

Total Harmonic distortion: 0.1% (20Hz ~ 100kHz)

:

:

Sine, Square, Triangle, Positive Ramp, Falling Ramp, Noise, 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, Exponent ial, Half-round, SINX/X, Square root, Tangent, Cardiac,
Earthquake, Combination

Duty Cycle: 0.1% ~ 99.9% (below 10kHz), 1% ~ 99% (10kHz ~ 100kHz)
Rise/Fall Time: 100ns （Duty cycle 20%）

DC range:  10mV – 10V (high impedance)
DC Accuracy:  ±5% of setting +10mV (high impedance)

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

Frequency Characteristics

Frequency Range:

Main waveforms (sine, square)

:
Model 4084/4084AWG: 1µHz ~ 20MHz
Model 4085: 1µHz ~ 40MHz
Model 4086/4086AWG 1µHz ~ 80MHz (sine wave)

1µHz ~ 40MHz (square wave)

Model 4087 1µHz ~ 120MHz (sine wave)

1µHz ~ 40MHz (square wave)

All other waveforms

:

All models: 1µHz ~ 100kHz

Frequency Stability: ±1×10

-6

(22℃±5℃）

Resolution: 1µHz
Frequency Accuracy:  ± 5×10

-6

(22℃±5℃）

Data entry Units: s, ms, Hz, kHz, MHz

Amplitude Characteristics

Amplitude Range:

4084, 4084AWG: 2mV ~ 20Vpp (open circuit), 1mV ~ 10Vpp (50)
4085

4086, 4086AWG: for Freq  40MHz: 2mV ~ 20Vpp (open circuit), 1mV ~ 10Vpp (50)

for Freq > 40MHz: 2mV ~ 4Vp-p (open circuit), 1mV ~ 2Vpp (50)

4087: for Freq  40MHz: 2mV ~ 20Vpp (open circuit), 1mV ~ 10Vpp (50)

for Freq > 40MHz: -76dBm ~ +13.5 dBm（50）or 0.1mV ~ 3Vpp（50）

Max. Resolution: 2µVpp (open circuit), 1µVpp (50)

Amplitude Accuracy: ± 1%+0.2mV (sine wave relative to 1kHz)
Amplitude Stability: ±0.5 % /3 hours

Flatness:

For amplitude  2Vpp: ±3% (frequency5MHz), ±10% (5MHz<frequency40MHz)
For amplitude >2Vpp: ±5% (frequency5MHz), ±10% (5MHz<frequency20MHz)

±20% (frequency>20MHz)

Models 4086/AWG, 4087 only: ±1dBm (frequency>40MHz)

Output Impedance: 50
Output Units: Vpp, mVpp, Vrms, mVrms, dBm

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

DC Offset Characteristics

Offset Range (open circuit)

Freq  40MHz): ±10Vpk ac + dc (Offset  2×peak-to peak amplitude)
Freq > 40MHz): ±2Vpk ac + dc (Offset  2×peak-to peak amplitude)

Resolution: 2µV (open circuit), 1µV (50)

Offset Error: ±5% of setting +10mV (Ampl.  2Vpp into open circuit)

±5% of setting +20mV (Ampl. > 2Vpp into open circuit)

AM Characteristics

Carrier Waveforms: sine or square
Carrier Frequency Range: same as main waveforms
Modulation Source internal or external
Modulating Waveform: 5 internal waveforms (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)

Amplitude of ext. input signal: 3Vp-p (-1.5V~ +1.5V)

FM Characteristics

Carrier Waveforms sine or square
Carrier Frequency Range: same as main waveforms
Modulation Source: internal or external
Modulating Waveform: 5 internal waveforms (sine, square, triangle, rising/falling ramp)
Frequency of modulating signal: 100µHz ~ 10kHz
Peak Frequency 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
Carrier Frequency Range: same as main waveforms
Control Mode internal or external trigger (external: TTL level, low level F1,

high level F2)

FSK Rate: 0.1ms ~ 800s

PSK Characteristics

Waveform: sine or square
Frequency Range: same as main waveforms
PSK: Phase 1 (P1) and Phase 2 (P2), range: 0.0 ~ 360.0°
Resolution: 0.1°
PSK rate: 0.1ms ~ 800s

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

Control Mode: internal or external trigger (external: TTL level, low level P1,

high level P2)

Burst Characteristics

Waveform: sine or square
Frequency Range: same as main waveforms
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
Start/Stop Freq.: same as main waveforms
Sweep Time: 1ms ~ 800s (linear), 100ms ~ 800s (log)
Sweep Mode: Linear or Logarithmic
External trigger signal frequency: DC ~ 1kHz (linear) DC~10Hz (log)
Control Mode: internal or external trigger

Rear Panel Terminals (for modulation and sweep)

Output MOD OUT

Frequency: 100µHz ~ 20kHz
Waveform: sine, square, triangle, rising/falling ramp
Amplitude: 5Vp-p ± 5%
Output Impedance: 600

Modulation IN

3 Vpp = 100% Modulation

External Input Trig/FSK/Burst

Level: TTL

Main OUTput

Impedance: 50Ω
Protection: Short circuit and overload protected

State Storage Characteristics

Storage Parameters: frequency, amplitu de, waveform, DC offset values, modula tion

parameters
Storage Capacity: 10 user configurable stored states
Storage Time: more than 10 years

2.2 Universal Counter

Frequency Range

Frequency Measurement: 1Hz ~ 100MHz
Totalize mode: 50MHz max

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

Input Characteristics

Sensitivity

Input attenuator disabled: 50mVrms (f: 10Hz ~ 50MHz), 100mVrms (f: 1Hz ~ 100MHz)
Input attenuator enabled: 0.5Vrms (f: 10Hz ~ 50MHz), 1Vrms (f: 1Hz ~ 100MHz)

Max. Input Voltage Allowed: 100Vp-p (f100kHz), 20Vp-p (1Hz~100MHz)
Input Impedance: R>500k, C<30pF
Coupling: AC
Waveform: sine or square
Low Pass Filter: cut off frequency about 100kHz (with internal attenuation:  -3dB)
with external attenuation:  -30 dB (f >1MHz)
Gate Time Setting: 10ms ~ 10s continuous ly adjustable
Display Bits: 8 (for gate Time>5s)
To talize Capacity:  4.29×10

9

Control Mode: manual or external gate control
Accuracy: time base error ± trigger error (when signal SNR > 40dB,

trigger error  0.3)
Time base:

Type: small TCXO
Frequency: 10MHz
Stability: ±1 × 10

-6

(22°C±5°C)

2.3 General

Power Supply 198~242V or 99~121V, Frequency: 47~ 63Hz
Power Consumption: <35VA
Operating Te mperature

0° to +40 °C

Operating Humidity 80% R.H

Storage Temperature

-40℃ to 70℃

Dimensions (W x H x D): 255 mm x 100 mm x 370 mm (10.0 x 3.93 x 14.56 inch)
Weight: 3 kg (6.6 lbs): models 4084, 4084AWG, 4085, 4086, 4086AWG

3.5 kg (7.7 lbs) model 4087
Remote Interface RS232

Accessories included
BNC to alligator cable
BNC to BNC cable
RS232 communication cable
Power line cord
Test report
Spare fuse
Installation disk for Arbitrary Waveform Creation Software (models 4084A WG or 4086AWG only)

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

3. PANEL DESCRIPTION

3.1 Front Panel

3.1.1 Overview of Keys:

Summary: Most keys have multiple functions. Primary functions are written on the key. Sim ply
press the respective key to enable a primary functions. All Function/Mode keys and some of the
numerical entry keys have associated secondary functions indicated above each key in blue. To
activate a secondary function, press the 【shift】key followed by the desired key. The bottom row
of the Function/Mode keys can be used to enter units directly. The unit is indicated below each key.
To enter a unit, enter a numerical value via the numerical keypad then press the corresponding unit
key. The unit key also serves as Enter function.

Data entry keys

Key

Name

0 Input Digit 0 Enter SW mode 7 Input Digit 7

1 Input Digit 1

2 Input Digit 2

3 Input Digit 3

4 Input Digit 4

5 Input Digit 5

6 Input Digit 6

*: Direct number entry: Press this key to clear the least significant bit of the displayed number.

Useful for correcting number entry before entry is confirmed with unit key.
External totalize mode: Press this key to stop counting and display present counting value.
Press again to resume counting.

:

Main

Function

Secondary

Function

Enable ARB1
waveform ***
Enable ARB2
waveform ***
Enable ARB3
wave ***
Enable ARB4
waveform***
Enable ARB5
waveform ***
Enable ARB6
waveform***

Key

Name

Main function

Enable ARB7
waveform ***.

8 Input Digit 8

9 Input Digit 9 Not available

 Input decimal point Reset Unit







Input negative
symbol
Move arrow key to
left *
Move arrow key to
right **

Enable ARB8
waveform ***

Enter system menu

Select pulse
Select Arblist

waveform

Secondary

Function

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

**: External totalize mode: Press this key to reset and resume event counter
*** models 4084AWG and 4086AWG only

Function/Mode Keys:

Key name Main Function

Freq./Period

Ampl./Pulse

width

FSK/PSK

Menu Menu Selection

FM Enable FM mode

AM Enable AM mode Enter Recall menu Low Pass Select MHz, Vrms

Sweep

Burst

Other Keys

Key Name Main Function Other Function

Output Main OUTPUT signal On/Off
Shift Select secondary function Enter units in s, Vpp, N

:

Toggle between
Frequency &
Period.

Amplitude Select.
FSK/PSK

Function Select

Enable Sweep
mode
Enable Burst
mode

Secondary

Function

Enable Sine Wa ve Not A vailable Not A vailable

Enable Square
Wave.
Enable Triangle
Wave
Enable positive
ramp
Enter Storage
menu

Enter Counter
Mode

DC Offset Select Gate Select Hz, dBm

Secondary

Function for

Counter Mode

Not A vailable Not A vailable

Not A vailable Not A vailable

Not A vailable Not A vailable
Attenuation

Selection

Freq. Meas./
Totalize Enable

Generate single trigger in sweep and
burst mode

3.1.2 Display Annunciators:

Unit Entry

ms, mVpp

kHz, mVrms

Display areas:

① Waveform Indication
② Main Alphanumeric Display
③ Frequency Measurement/Totalize Settings
④ Instrument states

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

Waveform states

Sine waveform is enabled (,main waveform)
Square waveform is enabled (main waveform)
Triangle waveform is enabled
Ramp waveform is enabled

Arb Arbitrary waveform mode is enabled

Frequency Measurement/Totalize states
Filter: Low Pass Filter is enabled
ATT: Input Attenuator is enabled
GATE: Gate received trigger

Function Generator states
Adrs: The instrument is in remote state.
Trig: Function Generator is waiti ng for a single trigger or external trigger.
FM: FM modulation is enabled
AM: AM modulation is enabled
Sweep: Sweep mode is enabled
Ext: Generator is configured for external signal input
Freq: Frequency measurement function is enabled
Count: Totalize function is enabled
FSK: FSK (frequency shift keying) modulation is enabled
FSK: PSK modulation is enabled
Burst: Burst mode enabled.
Offset: DC offset of output signal is not 0.
Shift: Shift key has been pressed, Shift mode is active
Rmt: The instrument is in remote state.

3.13 Description of front panel keys

【shift】key

Access secondary functions or to enter units “sec onds”, Vpp and “N”

Numerical key pad:

Keys are used for direct entry of numerica l values. Keys【0】【】【-】are assigned secondary
functions to enter the systems menu, reset the unit to its default values or revert to Standard
Waveform (“SW”) mode.

【】【】arrow keys

The primary function is to move th e flas hing di git lef t or right or to s elec t the desired ar bitrary
waveform from the Arb List (secondary function). When in Counter Mode, these 2 keys are
used to start/stop or reset/resume the counter.

【Freq/Period】key:

Toggle between frequency and period display (primary function) or to enable sine waveform.

【Ampl/Pulse Width】key:

Display and adjust the amplitude of waveforms or, when in pulse mode, toggle the display

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

between amplitude and pulse width. The secondary function activates the square waveform

【FSK/PSK】key:

Toggle between FSK and PSK modulation (primary function). Activate triangle waveform

【Menu】key:

Enter modulation parameters for FSK, PSK , FM, AM and burst modulation and for sweep
mode. When in standard wa veform mode (no modulation, main waveforms enabled), this key
can also be used to toggle the units for the amplitude display value bet w een Vpp, Vrms and
dBm. (Press the Amplitude key first, then the Menu key to toggle between the units). The
secondary function enables the ramp waveform.

【FM】key:

Activate FM modulation (primary function). Enter Storage mode (secondary function). Enter
units ms or mVpp after entering the desired value by nu merical key pad. In Coun ter Mode, this
key turns the input attenuator o n or off.

【AM】key:

Activate AM modulation (primary function). The secondary function is used to recall and
recreate signals stored in status memory. Enter units “MHz and “Vrms” after entering the
desired value by numerical key pad. Enable the low pass filter when in Counter mode.

【Sweep】 key:

Activate sweep mode. Select frequency measuring and totalize mode (secondary function) .
Enter units kHz or mVrms after entering the desired numerical value directly via the keypad.
Use the Shift key to toggle between frequency measurements and totalize mode.

【Burst】key:

Activate burst mode (primary function). Enter DC offset mode (secondary function). Enter
units Hz or dBm. When in frequency measurem en t m ode, press t his key to enter the g ate tim e.

【Output】key

Press this key to toggle the main OUTPUT signal between the ON and OFF state. By default
the output is turned on, indicated by the green LED and the currently active wave form is
available at the OUTPUT terminal. In Burst or Sweep m ode, this key is also used to generate a
single trigger.

3.14 Description of menu parameters

Use this key to configure modulation parameters, sweep mode parameters and system parameters.
Modulation and Sweep mode: After enabling modulation or sweep mode, press “menu” to
configure the related parameters. Each time you press the menu key, the parameter will flash for 1
second, followed by the currently act ive value of that param eter. Use the knob or numerical keys to
enter a new value. Once the parameter is set, press 【menu】 to advance to the next parameter.
Continue pressing the menu key to cycle throug h all parameters. Press 【Shift】【SW】to return to
the main waveform mode and to set the carrier waveform parameters.

Sweep Mode:

MODE —> START F —> STOP F —> TIME —>TRIG

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

MODE: Select LINEAR or LOGarithmic sweep
START F :Sweep start frequency
STOP F: Sweep stop frequency
TIME: Sweep time
TRIG: Select trigger source, INTernal or EXTernal

FM modulation:

FM DEVIA—> FM FREQ —> FM WAVE —> FM SOURCE

FM DEVIA: Peak frequency deviation
FM FREQ: Modulating signal frequency
FM WAVE: Modulating signal waveform (sine, square, triangle rising or falling ramp)
FM SOURCE: Toggle between internal and external modulating signal.

AM modulation:

AM LEVEL —> AM FREQ —> AM W AVE —> AM SOURCE

AM LEVEL: Modulation depth
AM FREQ: Frequency of modulating signal
AM WAVE: Modulating signal waveform (sine, squar e, triangle rising or falling ramp)
AM SOURCE Select internal or external modulating signal

Burst modulation:

TRIG —> COUNT —> SPACE T —> PHASE

TRIG Select trigger source, internal or external
COUNT: Number of burst cycles
SPACE T:Burst time spacing
PHASE: starting phase of the burst

FSK modulation:

ST ART F —> STOP F—> SPACE T —> TRIG

START F Primary frequency (same as carrier wave)
STOP F the second frequency (hop frequency)
SPACE T FSK rate
TRIG Select trigger source, external or internal

PSK modulation

P1 —> P2 —> SPACE T —> TRIG

P1 phase value #1
P2: phase value #2

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

SPACE T: PSK rate
TRIG: trigger mode, internal or external

System Function Mode:

POWER ON —> ADDRESS —> OUT Z —> INTERFACE—>…..

…………BAUD —> PARITY

POWER ON “Power on” state
ADDRESS: set GPIB address (option)
OUT Z: Configure amplitude display valu e for 50Ω or high impedance load termination
INTERFACE: Select RS232 or GP-IB (IEEE-488) interface (option)
BAUD: Baud rate for the RS232 interface
PARITY: Parity and Data Bits configuration for RS232

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

3.2 REAR PANEL

Ext. Trig/FSK/Burst :

Input Terminal for external trigger signals for FSK/PSK Burst modulation and sweep mode

MOD In

Apply modulating signal for AM and FM to this Input terminal

Meas Freq/TOT In

Input terminal for Universal Counter which operates in frequency measurement or Totalize
mode

MOD OUT

The internally generated modulating signal when in AM mode will be available at this output

RS232C

RS232 interface for remote control of instrument (all models) or for download of custom
arbitrary waveforms (models 4084AWG and 4086AWG only)

AC Socket and fuse co mpartment

Connect the supplied power line cord to this receptacle. Make sure to install the appropriate
fuse according to the selected AC voltage.

AC Input Selector switch

Set this switch to the corresponding AC voltage in your area

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4080 series Arbitrary/Function Generator with Counter –Instruction Manual

4. OPERATING INSTRUCTIONS

4.1 Installation

This section contains installation information, power requirements and initial inspection and signal
connections for the 4080 series generators.

Mechanical Inspection
This instrument was carefully inspected before shipment. Upon receipt, inspect the instrument for
damage that might have occurred in transit. If any sign of damage is found, notify your B+K
Precision distributor .

Instrument Mounting
The 4080 Series is intended for bench use. The instrument includes a handle adjustable for
optimum panel viewing angle. The instrument does not require special cooling when operated
within conventional temperature limits.

Power Requirements
The 4080 Series can be operated from any source of 99V to 242V AC and frequency of 48Hz to
63Hz. The maximum power con sumption is 35 VA. Replace fuses with the same type, according to
the rating indicated on the rear panel of the instrument.
The instrument power fuse is located in a fuse compartment below the AC input receptacle. To
access the fuse, first disconnect the power cord and then remove the fuse cartridge.

Power-on procedure
Turn on the instrument by pressing the power key on the front panel of the unit. The display should
be flashing “BK PRECISION” for 2 seconds followed by the model number. e.g. .“4084AWG” for 1
second. By default, the instrument will enter the standard waveform (“SW”) mode with the
frequency set to 10.00000000 kHz and the waveform annunciator displaying the “~ “ symbol. If
the Power ON configuration in the systems menu was modified, the parameters of th e last operat ion
before power-down will be displayed.

4.2. Main operating modes

“SW” standard waveform mode
In this mode, the generator outputs any of the 27 build-in waveforms, including the 2 “main
waveforms” sine and square. This also includes the 8 user programmable arbitrary waveform s
(models 4084AWG and 4086AWG only). For most waveforms, you can set frequency, amplitude
and DC offset. In this mode, modulation and sweep is not active and all annunciators in status area 4
are turned off . When modulation or sw ee p is en abled, press【shift】【SW】to return to this mode.

Modulation, Pulse and Sweep Mode
In this mode, the generator operates like a conventional function generator and the Arb annu nci ator
is turned off. The user can selec t one of t he modu lation m odes AM, FM, FSK, PSK, Burst or sweep
mode. The 2 main waveforms sine and square can be used as carrier signal.

There is a close, reciprocal relationship between the modulation/sweep mode and the standard

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