BWD MINI-LAB 603B User manual

MINI-LAB
BWD Precision Instruments Pty. Ltd.
(Incorporated in Victoria)
P.O. Box 298, Mulgrave North. 3170
5Dunlop Road, Mulgrave Vic. 3170 Australia
Phone [phone]
Telex AA 35115
Issue 23.

BWD 603B
MINI-LAB
TABLE OF CONTENTS
SECTION DESCRIPTION
GENERAL
PERFORMANCE
CONTROLS AND THEIR FUNCTIONS
OPERATION
APPLICATIONS
CIRCUIT DESCRIPTION
ALIGNMENT
MAINTENANCE
REPLACEMENT PARTS
GUARANTEE
PARTS LIST
L
1
2
3
4
5
6
7
8
9
10
11

INSTRUMENT HANDBOOK
MODEL BWD 603B MINI-LAB
1. GENERAL;
The MINI-LAB provides seven independent instruments in asingle compact
cabinet for use in the laboratory or classroom to supply signals and power
for awide range of measurements and experiments in the fields of electronics,
chemistry and bio-medical engineering.
The functions available include;-
(a) Sine, square, triangle, pulse and ramp generator with variable symmetry
and D.C. offset controls producing awide variety of waveforms from
0.001 Hz to IMHz which can be amplitude and frequency modulated by
an external signal
.
(b) Aramp generator 5sec to 50m sec.
(c) Aswitched power amplifier/bi-polar power supply/5 Volt supply combination.
(d) An operational Amplifier with variable gain.
(e) Two variable power supplies -1 to -15V and +1 to +15V at 1Ampere output.
(f) A0»-+ 200V variable power supply.
Acentre tapped 12.6V A.C. supply, and
(h) Numerous instrument combinations by link interconnection.
603B 1-IE

2.PERFORMANCE :
Funcfion Generafor :
2.1 Waveform: Sine, triangle or square, pulse and ramp with amplitude or
frequency modulation.
2.2 Frequency range: 8Decade ranges calibrated from 0.01 Hz to 1MHz plus a
200kHz to 2MHz range. An additional uncalibrated section of the dial
extends range to 0.001 Hz. Dial covers 2decades on each range.
Calibration: ±3% of full scale lOHz -IMHz.
2.3 Voltage output: Two simultaneous levels 10 Volts p-p open circuit, 5Volts p-p
into 600Q.
1Volt p-p open circuit, 0.5 Volts p-p
into 600Q.
Variable output provides continuous control of >100:1 of both outputs whilst
maintaining aconstant 600Q output impedance. Outputs, overvoltage and
short circuit proof.
Sinewave output level :Less than ±2% level variation over calibrated frequency
range into 600Q ±5%between 1and 2MHz.
2.4 Output offset: Output normally centered symmetrically about ground. Push/pull
switch applies acontinuously variable 0to ±5 Volts offset voltage on open
circuit. Control also doubles as ramp frequency control (see 2.8 below).
NOTE: 0-1 Voutput has ±0.5V offset.
2.5 Syr.in'.otry (fixed): ±2% from O.OlHz to 1MHz (calibrated portion of dial).
Symmetry (variable) :Pulse or ramp waveforms. Continuously variable from
1:1 to over 1:50 or 50:1 by switch selection. Applies to sine, triangle or
square waveforms. Variable control also doubles as ramp amplitude (see 2.8 below).
2.6 Sine wave distortion: <1.5% lOHz to >50kHz <2% at IMHz (typically
0.6% 20Hz to 50kHz).
Square wave rise time: lOOnsec into 600Q load and <50pf capacitance.
Triangle linearity: >99% within calibrated range on dial up to lOOkHz.
Triangle symmetry: Better than 2% within calibrated range up to lOOkHz.
2.7 Frequency modulation: Function Generator can be swept over 2decades by the
internal ramp generator or over 4decades by an external log sweep. It can
also be used as an externally programmed oscillator over a10,000/1 frequency
range.
Input: 1Volt/dial division.
Input impedance: 25KQ.
Linearity: 2%.
Input frequency: DC to >10kHz.
2.8 Sweep ramp generator:
Output voltage: 0to >+10 Volts with acontinuously adjustable upper limit
from +0.6 to +10 Volts using the variable symmetry control in the OFF mode.
Ramp duration :>4 sec to 65m sec approximately.
Continuously adjustable by the OFFSET control in the OFF position.
When coupled into the FM socket, the Function Generator will sweep from the
frequency selected by the dial up to the frequency set by the ramp amplitude
control. An automatic circuit prevents the sweep exceeding the dial range.
Horizontal drive to oscilloscope or recorder is also taken from ramp output
via the voltage amplifier (see 2.14) to set drive voltage and polarity required.
2-1
603b

2. PERFORMANCE (continued)
2.9 Amplitude Modulation: 0to 100% modulation all output waveforms from O.OOlHz
to 2MHz.
Input; 4volts p-p for 90% modulation.
'
Input resistance: approximately lOKQ.
Modulation input range: DC to 250kHz. An input voltage may also be used to
control the output level remotely from 0.5 to 20 volts p-p. NOTE: Unmodulated
carrier output level is 10 volts p-p, and 20 volts p-p at peak modulation
(open circuit). Both AM and FM modulation can be applied simultaneously.
2.10 TTL Output: Identical pulse width to main output. >3volts output into
2TTL inputs. <80n sec rise and fall time.
Selectable Power Source:
2.11 Amplifier
Gain: Voltage, fixed xlO. Input 3volts p-p for 30 volts p-p output maximum.
Current gain approximately x5000.
Input: lOKQ, inverting input only.
Frequency response: DC to >80khz at 20 volts p-p into 15Q.
Rise time: <5p sec for ±10 volts output swing.
Maximum output: ±15 volts minimum ±1 amp current (automatic
overload). 7Watts RMS into 15Q load. ±15 volts into>15Q.
Distortion: <0.1% at 1kHz increasing to <0.5% at 20kHz at full output
(+ 15 volts into 15Q).
Hum and noise; 60db below max. output (<30mV p“p).
Output impedance; <0.2Q.
2.12 Bi-Polar power supply
Voltage Range: Continuously variable from +15 volts through zero to -15 volts.
Current 1amp maximum at any voltage setting (automatic overload).
Output impedance: <0.2Q.
Hum and noise: <25mV p-p (5mV rms) at full output (15 volts at 1amp).
2.13 Fixed power supply:
Voltage +5volts
Current 1amp with automatic overload
Output impedance: <0.5Q.
Hum and noise: <25mV p-p at full output (8mV rms).
Voltage/Operational amplifier;
2.14 Amplifier
Gain: Continuously variable from xl to xlOO approximately.
Input: Balanced lOKQ each side to ground with gain control in circuit.
Input overvoltage proof.
Frequency response; DC to >80kHz -3db at all gain settings.
Slew rate; 4V/p sec.
Output lmpedance:<500fi (short circuit proof).
Output noise at XICO gain (input open circuit): <40mV p“p.
2-2 603B

2.PERFORMANCE (continued)
2.15
Operational amplifier
Input 0.5M^ isolated by switch
Performance characteristics see fig. 2a and b.
Large Signal Frequency
Response
I
•iSM 1M 2M 5M IDM 20M SOM
FR£QUeNCY(Ht)
Open Loop Frequency
Response
“1
s——
1
T*»2S C
V
NV,*
_| 1
“1 kPHASi Z
nKi—
'
r
CAJN\\
.20 1I I -IIIt
to 100 UtOk t00t> 1M 10M IQOM
FREQUENCY (Hii
Fig. 2a Fig. 2b
Low Voltage Power Supplies :
2.16 Voltage output: Two independent variable outputs v/ith acommon but
isolated zero line (200 volts DC isolation).
Range +1^ to +15 volts and -• 1^ to -15 volts or asingle ±3 to 30 Volts.
Current output: 1amp maximum each output -overload protected.
Regulation: for 10% line change, or 0to 1amp load change.
(Typically >0.5%).
Hum and noise: >5mVRMS at full load.
NOTE: Minimum voltage approximately IV to 2V.
High Voltage Power Supply :
2.17 Specifications apply at anominal input voltage of 235/117 volts AC.
Voltage output 0to 200 volts DC. 30m amp available at 175 volts DC.
20m amps at 200 volts EX^. Constant current overload at approximately
40m amp.
Output referred to ground.
Regulation: 1% for 10% line change from nominal input voltage, or 0
to 30m amp load change measured at 150 volt output.
Hum and noise: >25mV RMS at full output.
AC Supply ;
2.18 Voltage and current 6.3 volts to 0to 6.3 volts 1amp each side..
Completely isolated and each 6.3 volt leg is separately fused.
f'ucilities by Interconnection:
2.19 Power Waveform Output (2.1 with 2.11)
Function generator linked to power amplifier
Frequency range: 0.001 Hz to >80kHz.
Output: 0-30 volt p-p with 1amp capability. Output may be
symmetrical or offset about ground to ±15 volt p-p (minimum).
2.20 A.M. Modulation At Line Frequency. (2.9 with 2.18).
With 6.3 Volt AC supply linked to A.M. input via a39KSi resistor, sine
output will be 90% approximately A.M. modulated. Carrier output
range 0.001 Hz to 2MHz.
603B 2-3

2. PERFORMANCE (continued)
2.21 F.M. Modulation at Line Frequency (2.7 with 2.18)
Linked as for A.M. but to F.M. socket with a39KQ resistor, sine, square
or triangle will be swept over- adecade range of calibrated dial frequency.
2.22 Swept Output (2.7 with 2.8)
The function generator output may be swept over the entire 2decade range
of the dial on any range or down to <10% of any portion of the dial.
2.23 High Sensitivity Power Amplifier (2.11 with 2.14)
With operational amplifier linked to power amplifier.
Output; As for power amplifier specification.
Voltage gain; Continuously variable from xlO to xlOOO.
Frequency response; DC to >20kHz.
2.24 Function Generator Op Amp Link (2.1 with 2.14)
Push-pull signals; With generator output linked to inverting input asignal
180° out of phase with the generator is obtained at frequencies up to 80kHz.
±Pulse output; Sharp pulses to >100kHz can be generated by over-
driving the op-amp with offset triangular waveforms. Rise time is controlled
by degree of overdrive and op-amp gain. Other waveforms such as half
sine, log curves, truncated triangular and complex shapes of almost infinite
variety can be obtained by combining the wide range of facilities provided.
2.25 Power Supply; +45 volt 1amp (2.12 with 2.16)
By linking the -15 volt output to the bipolar output, output voltages to +45
volts can be set. By connecting the +15 volt output to the bi-polar supply
voltages to -45 volts can be set.
2.26 Modulated Power Supply. ±45 volt 1amp (2.1 and 2.11 with 2.16)
If the bipolar supply is switched to power amplifier and its input linked
to the function generator the low voltage supply can rise on top of the
amplifier output at low frequencies to provide for example, simulated power
line ripple.
2.27 Other facilities.
The generation of complex waveforms and many, experiments and measurements
are described in the applications section (Section 5) of this manual.
General Details;
2.28 Power requirements;
l90^°o^265'^vo?ts )
-60Hz, By switch selection (rear panel).
2.29 Finish; Light coloured panels and sage green vinyl coated aluminium covers
with anodised aluminium surrounds.
2.30 Warranty; The instrument is guaranteed for aperiod of twelve (12) months
against faulty materials and workmanship.
2.31 Dimensions; 420mm (I62") wide x200mm (8") high x260mm (10-1/4") deep.
Overall knobs, etc.
2-4 603B

2. PERFORMANCE (continued)
General Details (Cont'd)
2.32 Weight: 10kg (21 lbs) net, 11kg (24 lbs) packed.
2.33 Safety Standards: This instrument is designed to closely conform to lEC 348
recommendations.
2.34 Ordering Code: BWD 603B.
Accessories:
Dust Cover Part No. D28.
For full range of accessories suitable for educational experiments, see
separate list of 600 accessories.
2.35 Additional Products:
Oscilloscopes: Awide range of instruments are manufactured by BWD
Instruments from single channel 6MHz to dual trace lOOMHz oscilloscopes
including storage oscilloscopes to display, measure or store your 'MINI-LAB' .
waveforms.
600 SERIES ACCESSORIES:
600B Electromagnet with 1metre leads and 19mm square 75mm long pole
piece.
600C 24V lamp mounted with leads and plugs.
600D Microphone with 1metre screened lead and input plugs.
600E Interconnecting leads, 1metre long, fitted with 4mm stacking plugs.
600F 7Pin valve base on stand. Complete with 6AU6 valve.
600G Transistor mounted on stand. Complete with 2N3054 silicon NPN
power transistor.
600H 4Silicon diodes (2 amp). Diodes type BYX21-200.
6001 400kHz -2mHz parallel resonant circuit and detector diode.
600L R.C. charging circuit. Time constant 1sec.
600M L.C. charging circuit. Time constant 1sec.
600N 30Q 100mm loudspeaker on stand.
603B2-5

PERFORMANCE (continued)
600 Series Accessories (continued)
600P C.L. &Rphase and impedance circuit.
600Q Low voltage relay with change over contacts.
These are but asample of the wide range of accessories available for educational
fields in electronics and electrical engineering from BWD PRECISION INSTRUMENTS
PTY. LTD.

3. CONTROLS AND THEIR FUNCTIONS;
The front panel is divided into three major sections:-
3.1 Signal Source, comprising of afunction generator, pulse output,
amplitude modulator and aramp generator.
3.2 Amplifier section, containing aswitchdble Power Amplifier/Bi Polar Power
Supply, and aswitchable Voltage/Operational Amplifier.
3.3 Power Supply section, containing three independently variable power supplies
and one AC source at line frequency.
6719 21 20 31 30 28 29
13 10 8912 14 11 17 15 18 16 22 23 26 24 25
Signal Source Controls.
1.Frequency Range Switch: Desired frequency range can be obtained by
depressing the correct button. When the xO.l
and xl buttons are depressed simultaneously the
resultant frequency is xO.Ol and with all buttons
out x200kHz.
2. Frequency Dial: Calibrated from 1to 10 with an additional 0.1
marking and is used in conjunction with the
Frequency Range Switch to set the output
frequency
.