B+K precision 3011B User manual

INSTRUCTION bkPreiser,
MANUAL MODEL 3011B
2MHz
DIGITAL DISPLAY
FUNCTION
GENERATOR

TEST INSTRUMENT SAFETY
WARNING
Normal use oftest equipment exposes you to acertain amount ofdangerfrom electrical shock because testing must often be
performed where exposed high voltage is present. An electrical shock causing 10 milliatnps ofcurrent to pass through the
heart will stop most human heartbeats. Voltage as lowas 35 volts dcorac rms should be considereddangerous and hazardous
since it can produce alethal current under certain conditions. Higher voltages pose an even greater threat because such
voltage can more easily produce alethal current. Your normal work habits should include all accepted practices that will
prevent contact with exposed high voltage, and that will steer current away from your heart in case of accidental contact
with ahigh voltage. You will significantly reduce the riskfactor ifyou know and observe thefollowing safety precautions:
1.Don't expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test connections
in high-voltage circuits. Discharge high-voltage capacitors after removing power,
2. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However, remember that high
voltage may appear at unexpected points in defective equipment.
3. Use an insulated floor material or alarge, insulated floor mat to stand on, and an insulated work surface on which to place equipment; make
certain such surfaces are not damp or wet.
4. Use the time-proven "one hand in the pocket" technique while handling an instrument probe. Be particularly careful to avoid contacting a
nearby metal object that could provide agood ground return path.
5. When testing ac powered equipment, remember that ac line voltage is usually present on some power inputcircuits such as the on-off switch,
fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is turned off.
(continued on inside rear cover)

Instruction Manual
for
Model 3011B
2MHz
DIGITAL DISPLAY
FUNCTION GENERATOR
MAXTEC INTERNATIONAL CORP.
6470 W. Cortland St. •Chicago, IL 60635

MODEL 3011B IS NOW "OUTPUT FUSED"
Effective with serial no. 147-27253, Model 301 IB is factory equipped with an output fuse. Afuse has been added in
series with the OUTPUT jack to help protect the instrument from damage to an external voltage.
Under normal operation, the generator output should never be connected to an external voltage other than low dc
values that can be matched with the OFFSET control. Model 301 IB was always overload protected so that shorting
the output, even continuously, would cause no damage. The output fuse further protects the instrument against external
voltage. The fuse may blow if the output is accidentally connected to an external voltage, but the blown fuse may
prevent an expensive repair.

TABLE OF CONTENTS
Page
TEST INSTRUMENT SAFETY Inside Front Cover
SPECIFICATIONS >3
CONTROLS AND INDICATORS. <5
OPERATING INSTRUCTIONS 8
Frequency And Waveform Selection 8
Considerations 9
Voltage Controlled Frequency Operation 10
TTL/CMOS Output 11
Duty Cycle Control 11
Function Generator Applications Guidebook 12
OUTPUT PROTECTION CONSIDERATIONS 13
MAINTENANCE 14
Disassembly And Reassembly 14
Line Voltage Selection 15
Fuse Replacement 15
Instrument Repair Service 15
WARRANTY SERVICE INSTRUCTIONS 16
LIMITED ONE YEAR WARRANTY 17
ORDERING INFORMATION -nB& K-Precision's Guidebook to Function Generators" 18
1

SPECIFICATIONS
(All specifications apply with coarse frequency dial between 0.2 and 2times range).
Basic Outputs:
Frequency Range:
Frequency Control:
Maximum Amplitude:
Amplitude Control:
Attenuator:
Output Impedances
DC Offset:
Duty Cycle Control;
Sine Wave, Triangle Wave, Square
Wave, TTL Pulse, and CMOS Pulse.
0.2 Hz to 2MHz (7 ranges). Four
digit frequency counter display.
Separate coarse and fine tuning
controls.
20 Vp-p (open circuit).
10 Vp-p (into 50 £2 load).
Continuously variable, 20 dB range
typical.
-20 dB +1 dB.
50 £1 ±10% •
Continuously variable, from -10 V
to +10 V(open circuit), -5 Vto
+5 Vinto 50 £2.
Continuously variable from 1:1 to
10:1.
Sine Wave Function:
Distortion:
Frequency Response:
Square Wave Function:
Symmetry:
Rise Time:
Triangle Wave
Linearity:
TTL Output:
Level:
Rise Time:
CMOS Output:
Level:
Rise Time:
0.2 Hz to 20 kHz; <1%,
20 kHz to 200 kHz; <2%.
0.2 Hz to 100 kHz, <0.2 dB,
100 kHz to 2MHz; <1 dB.
0.2 Hz to 100 kHz; <2%.
<120 ns.
0.2 Hz to 100 kHz; 98%,
100 kHz to 2MHz; 95%.
>3Vp-p.
<30 ns.
Continuously adjustable from
4Vp-p (+1 Vp-p) to 14.5 Vp-p
(±0.5 Vp-p).
<120 ns.
3

SPECIFICATIONS
VCF (Voltage Controlled
Frequency) Input:
Input Voltage: Approximately +10 V(±1 V) causes
10:1 frequency change.
Impedance: Approximately 10 kfi.
Frequency Counter
(Internal Only):
Accuracy: tTime Base Accuracy ±1 Count.
Time Base Accuracy: +10 PPM (23° C+5° C).
Weight: 5.5 lb (2.5 kg).
Dimensions (WiHi Dh 9.65 x3.75 x11 ",
245 x95 x280 mm.
Accessories Supplied: One cable, BNC to insulated clips.
Power Cord.
Spare Fuse.
Instruction Manual.
Schematic Diagram &Parts List.
Power Source: 120/220/240 VAC tl0%, 50/60 Hz.
4

CONTROLS AND INDICATORS

CONTROLS AND INDICATORS
1. PWR Switch. Turns power on and off.
2. Range Selectors. Selects frequency range. Decade fre-
quency type, seven ranges from 1Hz to 1MHz. Fre-
quency can be adjusted from 0.2 to 2times the range
selected. For example, if the 100 Krange is selected,
frequency can be adjusted (see Frequency Control) from
20 kHz to 200 kHz. Numbers under pushbuttons indicate
gate time (see GATE LED).
3. Function Selectors. Selects square, triangle, or sine
waveform at OUTPUT jack.
4. AMPL Control. Controls amplitude of signal at OUT-
PUT jack. When control is pulled out, signal is attenu-
ated 20 dB (PULL -20dB).
5. OUTPUT Jack. Waveform selected by FUNCTION
switches as well as the superimposed DC OFFSET
voltage is available at this jack.
6. TTL/CMOS. When control is pushed in, aTTL signal is
present at the TTL/CMOS jack. Level is fixed at 3V
p-p and turning control has no effect. When the control
is pulled out (PULL CMOS), aCMOS signal is present at
the TTL/CMOS jack. Turning the control clockwise
increases the amplitude and turning the control coun-
terclockwise decreases amplitude (amplitude is adjust-
able from approximately 4Vp-p to 14.5 Vp-p).
7. TTL/CMOS Jack. Square wave selected by TTL/CMOS
control (either TTL or CMOS) is available at this jack.
The output is independent of the AMPL and OFFSET
controls.
8. OFFSET ControL When control is pushed in, DC offset
is set at zero. When control is pulled out (PULL ADJ),
clockwise rotation changes DC offset in apositive
direction and counterclockwise rotation changes DC
offset is anegative direction. Full clockwise rotation
gives approximately +5 Vinto 50 SI load (+10 Vopen
circuited). Full counterclockwise rotation gives approx-
imately -5 Vinto 50 Qload (-10 Vopen circuit).
9. VCF IN Jack. Voltage Controlled Frequency input.
Permits external sweep or frequency control. Positive
voltage decreases the output frequency.
10. DUTY ControL Rotation adjusts the duty cycle of both
the main OUTPUT signal and the TTL/CMOS signaL
Fully counterclockwise rotation is the CAL position
(normal duty cycle). Duty cycle changes when control is
rotated away from CAL position. When control is pulled
out (PULL INV), the square wave at the main OUTPUT
and the TTL or CMOS signal are inverted.
11. FINE Frequency ControL Vernier adjustment of output
frequency for ease of setting to aprecise frequency.
12. COARSE Frequency ControL Coarse adjustment of
output frequency (main output and TTL/CMOS output)
from .2 to 2times the selected range.
13. Frequency Counter Display. Displays, frequency of
internally generated frequency.
14. Hz and kHz LED. Indicates whether display is showing
Hz or kHz.
6

CONTROLS AND INDICATORS
IS. GATE LED. Indicates when frequency counter display is
updated. When the 10 Kthrough 1Mfrequency
switches are selected, the LED. will flash 10 times per
second (every 0.1 second). When the 10 through 1K
switches are selected, the LED will flash once each
second and when the 1switch is selected, the LED will
light every 10 seconds. As the LED turns off, the dis-
play is updated.

OPERATING INSTRUCTIONS
FREQUENCY AND WAVEFORM SELECTION
1. With the unit plugged into apower source, depress the
PWR switch.
2. Select the desired frequency range by depressing the
appropriate range switch. The output frequency is dis-
played, with the appropriate decimal point, on the LED
display. The Hz or kHz indicator is also lit.
3. Rotation of the COARSE frequency control will quickly
set the output frequency to the approximate desired
value. The FINE frequency control should then be used
to easily set the output to the specific desired value.
The frequency selected is available at both the TTL/
CMOS jack and the OUTPUT jack.
4. Select the waveform desired (square, triangle, or sine)
by depressing the appropriate FUNCTION switch. The
phase relationships of the waveforms available are
shown in Fig. 2. Be sure that the DUTY control is set to
CAL.
5. The amplitude of the selected output signal at the main
OUTPUT jack is adjusted with the AMPL controL
Maximum signal level is 10 Vp-p (into 50 fl), and signal
level can be decreased by turning the control counter-
clockwise, or pulling the control out for an additional
20 dB step of attenuation (PULL -20dB).
6. For information on the TTL and CMOS signals, see the
"TTL/CMOS OUTPUT" section of this manual.
7. ADC component can be added to the signal at the main
OUTPUT jack by use of the OFFSET controL The DC
component introduced is independent of the AMPL
control and does not apply to the TTL/CMOS jack. The
level of DC can be varied by ±10 volts open circuited or
±5 volts into 50 J2.
CONSIDERATIONS
1. The COARSE frequency control adjusts from approxi-
mately two-tenths to two times the indicated range
value. For example, if the 10 Krange is selected and
the COARSE frequency control is set to the most
counterclockwise major line, the output frequency is
approximately 2kHz. When the COARSE frequency
control is set to the most clockwise major line, the
output frequency is approximately 20 kHz. Fig. 3shows
these major lines.
2. It is best not to set the COARSE frequency control
beyond either the 0.2 or 2position. Instead, select the
next lower or higher range. When the COARSE control
is set to such aposition, erratic operation could occur.
8

OPERATING INSTRUCTIONS
CMOS OV
mov -L- mrn
Square OV
Triangle OV —7* —-,
Sine OV
Fig. 2. Output Waveform And Phase Relationship.
3. It is advisable to set the FINE frequency control to the
approximately center of its range before setting the
COARSE frequency control. This assures that the FINE
control will not reach its limit of rotation while trying
to finalize the frequency setting.
4. The FINE frequency control spans about 10% of the
range. This gives afine tuning capability so that it is
easy to set the frequency to aprecise value.
Fig. 3. COARSE Frequency Control.
5. When the 1Hz range is selected, the gate time is 10
seconds. This means that the display is updated once
every 10 seconds, and that the resolution is 0.1 second.
However, the result of afrequency change may not be
displayed until 10 seconds later. Keep adjusting the
frequency in progressively smaller steps and waiting for
the display update until the desired frequency is
obtained.
6. When using the higher output frequencies and when
using the square wave output, terminate the cable into
50 ft to minimize ringing. Also, keep cables as short as
possible.
7. Remember that the output signal swing of the generator
is limited to ±10 volts open circuited or +5 volts into
9

OPERATING INSTRUCTIONS
50 £2. This applies to the combined signal and DC offset.
Clipping occurs slightly above these levels. Fig. 4
illustrates the various operating conditions encountered
when using the DC offset. If the desired output signal is
large or if alarge DC offset is required, an oscilloscope
should be used to make sure that the desired combina-
tion is obtained without undesirable clipping.
A. Zero DC offset
with maximum
signal
+5V
0V
-5W
B. Offset limits _. '\/\_ J
without clipping wXT XJ
-5V Positive Negative
DC offset DC offset
C. Excessive offset 0V ^^^Sj
Positive Negative
DC offset DC offset
Fig. 4. Use of DC OFFSET Control.
VOLTAGE CONTROLLED FREQUENCY OPERATION
The Model 3011B can be operated as avoltage-controlled
oscillator (VCO) by. using an external control voltage applied
to the VCF IN jack. The externally applied voltage will vary
the frequency which is preselected by the range switches and
the frequency control controls. Applying approximately
+10 Vwill cause the frequency to decrease by about 10 times
(a 10:1 ratio).
Do not apply more than +15 volts (dc or dc +ac
peak) to the VCF IN jack. Inputs of more than
15 volts will not cause any further shift in the fre-
quency and could cause damage to the Function
Generator.
1. Select the desired frequency range and function.
2. Set the DC offset, if required.
3. Set the starting frequency and amplitude to the desired
level.
NOTE
Keep the (starting) COARSE frequency control
between the 0.2 and 2positions (see Fig. 3).
4. To operate the function generator as asweep generator,
apply apositive going ramp signal to the VCF IN jack.
As the voltage increases, the frequency decreases. A
10

OPERATING INSTRUCTIONS
ramp that goes from to +10 Vwill cause the frequency
to decrease by a factor of 10 (i.e., if the starting fre-
quency is 10 kHz, when the ramp reaches +10 V, the
output frequency will be 1kHz). The rate of sweep can
be adjusted by varying the frequency of the ramp signal.
5. Specific frequencies can be selected by applying afixed
dc voltage to the VCF IN jack or the frequencies can be
stepped by applying astepped dc voltage.
TTL/CMOS OUTPUT
The TTL/CMOS output jack provides afast rise time
square wave output (no triangle or sine output available).
Either afixed 3Vp-p TTL or avariable (approximately
4Vp-p to 14.5 Vp-p) CMOS output are available. The output
pulses always go positive with respect to ground. This signal
can be used as an external sync pulse for oscillscopes or as a
variable frequency signal source for exercising logic circuits.
NOTE
Because of the fast rise time of this output, cable
length should be minimized to limit ringing and
overshoot.
1. Select the desired frequency range and adjust the fre-
quency controls as required. The AMPL and OFFSET
controls have no effect on the signal at the TTL/CMOS
jack.
2. Select aTTL signal by pushing in the TTL/CMOS
controL Select aCMOS signal by pulling out the TTL/
CMOS control (PULL CMOS) and adjust the level of the
CMOS signal by rotating the control (the TTL level is
fixed).
DUTY CYCLE CONTROL
The Model 30118 Function Generator has avariable duty
cycle control to provide ramps (sawtooth) or pulses. The duty
cycle control affects both the main OUTPUT and the TTL/
CMOS output. If astandard square, triangle, or sine wave-
form are desired (normal duty cycle) the DUTY control should
be set to CAL (fully counterclockwise). Fig. 5illustrates the
function of the DUTY controL
NOTE
As the DUTY cycle is changed, the frequency will
decrease. Be sure to set the desired frequency
after the DUTY cycle has been adjusted.
1. Select the desired function (eith rsquare or triangle
wave if the main OUTPUT is to be used or TTL or
CMOS if the TTL/CMOS output is to be used) and
frequency range.
2. Adjust the amplitude and DC offset if the main OUT-
PUT is to be used or adjust the CMOS level if aCMOS
signal is to be used (the TTL has afixed level).
11

OPERATING INSTRUCTIONS
SQUAREiRE r
"J
J
CMOS
OV
TTL 1
ov <-
INV SQUARE
INV CMOS
IRE 1
OV [
OS —
I
ov L
INVTTL
OV 1
L_ Adjust I
Iduty cont.H I
ii
L_ Adjust ml _J
\frequency curt. H
1J
n
n
Noli that TTL is apposite polarity
of square wive (main output)
and CMOS is opposite polarity
of TTL
Fig. 5. Effect Of DUTY Control On
Square Wave, TTL, And CMOS Signal.
3. Adjust the DUTY control so that the desired duty cycle
is obtained (display on an oscilloscope for set-up if
desired).
4. Adjust the frequency of the signal using the COARSE
and FINE frequency controls. The DUTY control can be
pulled out to cause anegative going pulse (PULL INV) at
either the main OUTPUT jack (for square wave only) or
the TTL/CMOS jack (the triangle and sine wave cannot
be inverted).
FUNCTION GENERATOR APPLICATIONS GUIDEBOOK
B&K-Preciaion offers a"Guidebook to Function Gener-
ators" which describes numerous applications for this instru-
ment, including hook-up details. It also includes aglossary of
function generator terminology and an explanation of func-
tion generator circuit operation. It may be obtained free of
charge by filling out and mailing the postage paid card
enclosed with the Model 3011B.

OUTPUT PROTECTION CONSIDERATIONS
Use care when connecting the function generator output to
asignal injection point. Excessive voltage at the point of
signal injection is fed into the function generator and causes
internal damage. The TTL output is particularly susceptible
to damage from external voltage greater than +6 volts or any
negative polarity voltage.
Damage of this type usually occurs by accidentally con-
necting the output of the function generator to avoltage in
the equipment under test. The following protective measures
are strongly recommended:
1. The user should understand the equipment under test
well enough to identify valid signal injection points (ie;
the base of atransistor, alogic input of agate, etc.).
The voltage at valid signal injection points is rarely high
enough to damage the instrument.
2. If in doubt about the safety of asignal injection point,
measure the voltage present at the intended point of
signal injection before connecting the function
generator output to that point.
3. When applying the main output of the function
generator to acircuit point containing adc level, adjust
5.
the DC OFFSET control so that dc level at the main
output matches the circuit voltage.
Connect the TTL OUTPUT only to TTL-level circuits.
Connect the CMOS OUTPUT only to CMOS circuits.
Measure the Vcc of the circuit under test and adjust the
CMOS ADJust as instructed in the manual.
When the function generator is used by students or other
inexperienced users, the following circuit could be
added into your TTL output probe or test clip set. It
will protect the TTL output of the generator against
external voltages up to +20 volts.
TTL (+)
FUNCTION GENERATOR
TTL OUTPUT 1W
GROUND
"
150 Q, 2W
i
—Wv
TO
CIRCUIT
Fig. 6. Circuit for Protection of TTL Output.
13

MAINTENANCE
WARNING Reassembly
The following instructions are for- use by qual-
ified service personnel only. To avoid electrical
shock, do not perform servicing other than con-
tained in the operating instructions unless you
are qualified to do so.
Remember that ac line voltage is present on line
voltage input circuits any time the instrument is
plugged into an ac outlet, even if turned off.
Always unplug the Function Generator before
performing service procedures.
DISASSEMBLY AND REASSEMBLY
In order to access the fuse and the line voltage selector,
the bottom half of the case must be removed. To remove the
bottom of the case:
Disassembly
1. Unplug the Function Generator and turn the unit upside
down. Remove the four screws and the rubber foot pads
from the bottom of the unit.
2. Lift the bottom section of the case up.
1. Line up the slots in the bottom case half with the front
panel and put the two case halves together.
2. Replace the rubber foot pads and screws.
Fig. 7. Fuse And Line Voltage Selector Location.
14

MAINTENANCE
LINE VOLTAGE SELECTION
1. If the line voltage needs to be changed, disassemble the
function generator case (see the DISASSEMBLY section
above) and unplug the plastic connector by pulling it
straight up (see Fig. 7for location).
2. Align the plastic connector with the desired voltage se-
lector pin and push the plug down over the pin. Be sure
that the correct fuse is installed (0.5 Afor 110 Vopera-
tion and 0.3 Afor 220 or 240 Voperation) in the fuse
holder. Reassemble the case.
Output Fuse F501
If fuse F501 opens, there will be no output signal or DC
offset voltage available at the OUTPUT jack. All other
functions will be normal. The OUTPUT can be measured with
an oscilloscope or multimeter.
1. To replace fuse F501, disassemble the case.
2. The fuse is connected in series with the OUTPUT jack.
Unsolder the axial lead type fuse and replace only with
an identical 200 mA slow blow fuse.
FUSE REPLACEMENT
Power Fuse F101
If fuse F202 opens, the LED display will not light and no
functions will operate.
1. To replace the fuse, disassemble the case and remove
the blown fuse (see Fig. 7 for location).
2. The fuse should not normally open unless aproblem has
developed with the unit. Try to determine and correct
the cause of the blown fuse, then replace only with the
correct value fuse (0.5 Afor 100 or 120 Voperation and
0.3 Afor 220 or 240 Voperation). Reassemble the case.
INSTRUMENT REPAIR SERVICE
Because of the specialized skills and test equipment re-
quired for instrument repair and calibration, many customers
prefer to rely upon B&K-Precision for this service. We
maintain anetwork of B&K-Precision authorized service
agencies for this purpose. To use this service, even if the in-
strument is no longer under warranty, follow the instructions
given in the WARRANTY SERVICE INSTRUCTIONS portion
of this manual. There is anominal charge for instruments out
of warranty.
15

WARRANTY SERVICE INSTRUCTIONS
(For U.S.A. and its Overseas Territories)
1. Refer to the MAINTENANCE section of your B&K-Preeision instruction manual for
adjustments that may be applicable.
2. If the above-mentioned does not correct the problem you are experiencing with your unit,
pack it securely (preferably in the original carton or double-packed.
3. Enclose aletter describing the problem and include your name and address.
4. Deliver to, or ship PREPAID (UPS preferred in U.S.A.) to the nearest BkK-Precision
authorized service agency (see list enclosed with unit).
If your list of authorized B&K-Precision service agencies has been misplaced, contact your
distributor for the name of your nearest service agency, or write to:
B&K-Precision, Factory Service Department
Maxtee International Corporation
6470 West Cortland Street
Chicago, Illinois 60635
Tel [phone]
Also use this address for technical inquiries
and replacement parts orders.
16

LIMITED ONE-TEAR WARRANTY
MAXTEC INTERNATIONAL CORPORATION warrants to the original purchaser that its B&K-Precision product, and the
component parts thereof, will be free from defects in workmanship and materials for aperiod of one year from the date of
purchase.
MAXTEC will, without charge, repair or replace, at its option, defective product or component parts upon delivery to an
authorized B&K-Precision service contractor or the factory service department, accompanied by proof of the purchase date in
the form of asales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by completing and mailing the enclosed warranty
registration card to MAXTEC, B&K-Precision, 6470 West Cortland Street, Chicago, Illinois 60635 within fifteen (15) days from
the date of purchase.
Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as aresult of unauthorized
alterations or repairs. It is void if the serial number is altered, defaced or removed.
MAXTEC shall not be liable for any consequential damages, including without limitation damages resulting from loss of use.
Some states do not allow limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to
you.
This warranty gives you specific rights and you may also have other rights which vary from state to state.
For your convenience we suggest you contact your B&K-Precision distributor, who may be authorized to make repairs or can
refer you to the nearest service contractor. If warranty service cannot be obtained locally, please send the unit to B&K-
Precision Service Department, 6470 West Cortland Street, Chicago, Illinois 60635, properly packaged to avoid damage in
shipment.
B&K-Precision Test Instruments warrants products sold only in the U.S.A. and its overseas territories. In other countries,
each distributor warrants the B&K-Precision products which it sells.
17