Scientific SM5074 User manual

User Manual
3 MHz Function Generator/
Counter
SM5074/ SM5075

2
SM5User Manual 074/ SM5075
Scientific Mes-Technik Pvt. Ltd.,
B-14 Industrial Estate, Pologround,
Indore 452015 (India)
Tel : [phone]/33
Fax : [phone],561641
Email : [email protected]
Copyright Scientific All rights reserved.©
This instrument contains proprietary information, no part of this manual may be
photocopied, reproduced or translated without any prior written consent.
Information in this manual supercede all corresponding previous released
material.
Scientific continues to improve products and reserves rights to amend part or all
of the specifications, procedures, equipment at any time without notice.
Rev 2.2 / 1212

3 MHz Function Generator/Counter
SM5074/ SM5075
Table of Contents
1. Introduction ........…………………….………..…................... 4
2. Technical Specifications .............….……...…......................5
3. Front Panel diagram 5074……….................. 8
Front Panel diagram 5075 ............................. 9
Front Panel Controls.............................................................10
4. Rear Panel Controls…………………………..…....................12
5. Operating Instructions…............………………….................14
General Information…..…………………….......................14
Safety….........……………………...…………................... 14
Operating Conditions …...…………………….................. 14
First Time Operation…..……………………….................. 15
Mode Selection….......……………………........................ 15
Use as a Function Generator…................….…................ 15
Modulation…................................................................... 16
Amplitude Modulation…...........………………............ 16
AM Standard….....……………………….....................17
AM Balance…...……………………….........................17
Frequency Modulation…....……………… 18
Pulse Width Modulation ….......……………….............19
PulseAmplitude Modulation.......................................19
External Control VCF........................................................20
Internal Modulation Generator..........................................21
Use as Programmed Frequency Generator...................... 21
Use as Sweep Function Generator................................... 21
DC Offset..........................................................................22
Trigger Output.................................................................. 22
Use as External Frequency Counter................................. 22
6. Maintenance ………………………………..….…..................23
Power Line Fuse Replacement …………….....................23
7. Dispatch Procedure For Service.......................................... 24
8. Warranty Conditions....……………..........…...…...................25
9. List of Service Centers....……………................................... 2
SM .................
SM ..................
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User Manual SM5074/ SM5075

Frequency Range 0.3 Hz to 3 MHz
¦ Operating Modes : Function Generator, Frequency Counter, Amplitude
Display
¦ Modulation : AM Standard & Balance, FM Int. & Ext.,
PWM, PAM
¦ Function Generator : Sine,Square,Triangle, Ramp, Pulse, Invert Ramp,
Invert Pulse, TTL, DC
¦ Digital Frequency Readout, Amplitude Readout
Precise control over setting via Encoder
DC-Offset Adjustment
Internal Sweep Facilities
Square Wave Risetime Typ. 70 ns
Display : LCD with back lit
Internal Modulation generator with Sine,Triangle, Square Wave output
(SM5075).
SM5075
back lit LCD signal purity
amplitude flatness
3 MHz Function Generator Counter
SM5074 / SM5075
■
■
■
■
■
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The various signals available from the Function Generator
Counter makes it a versatile signal source useful for most measurement and test
applications. Its low frequency ranges are particularly well suited for simulating
mechanical and servo techniques. has built in modulation signal source
for use in various modulation technique available in the instrument.
An auto ranging frequency Counter is activated by a single push button , external
signal frequencies are displayed on . The and constant
through out the entire range are the highlights of this Function
Generator. The can also be used in the sweep mode with an
internal or external signal source.
SM5074/ SM5075
SM5074/ SM5075
4SM5User Manual 074/ Sm5075

Technical Specifications
Operating Modes :
(SM5075)
Modulation :
:
Frequency Range :
Frequency Stability :
Waveform Characteristics :
Sine wave Characteristics :
Distortion :
Square wave
Risetime :
Overshoot :
Triangular Wave
Non-Linearity :
Ramp Wave
Polarity :
Pulse Wave
Polarity :
Duty Cycle :
TTL/Trigger Output
Function Generator, Frequency Counter, Amplitude
display,AM Generator
AM Standard & Balanced, FM int (sweep) & Ext., PWM,
PAM
Sine, Square, Triangle, Ramp, Pulse, Invert Ramp,
Invert Pulse TTL DC Free running, with or without
adjustable DC offset.
0.3 Hz to 3 MHz
< 0.1% / hr or 0.2 % /24 hr at constant ambient
temperature
0.3 Hz – 100 kHz : max. 0.5 %
0.1 MHz – 0.5 MHz : max. 1.5%
0.5 MHz – 3 MHz : max. 3%
typ. 70 ns
5%
1% (up to 100 kHz)
ve or - ve selectable
ve or - ve selectable
Adjustable 10% to 90% up to 300 kHz & 20% to 80%
300 kHz to 3MHz
Square Wave synchronous to signal output, TTL 4 Vpp
Function Generator
£
£
<
+
+
>
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User Manual SM5074/ SM5075

Frequency Display Accuracy :
Output :
Output Voltage :
Pulse Output :
Attenuation :
Amplitude Flatness :
Output Impedance :
DC Offset :
Amplitude Modulation
Frequency Modulation
Internal Sweep
Pulse Width Modulation
up to 3 Hz : (1%+3D)
3 Hz – 3 MHz : (0.1% + 1D)
(short-circuit-proof)
max. 20 Vpp (o.c.), 10 Vpp into 50
10 Vpp open circuit
max. 60 dB
2 steps : 20 dB 0.2 dB each
Variable : 0 to 20 dB
(sine/triangle into 50 )
0.3 Hz – 0.3 MHz : max. 0.2 dB
0.3 MHz – 3 MHz : max. 0.5 dB
50 (front panel), 600 (on rear panel)
Variable offset range : max. 2.5 V into
50 , max 5 V open circuit
(BNC connector on rear panel)
Modulation Depth : 0 to 100 % approx.
Bandwidth : DC to 20 kHz
Carrier Frequency : Up to 3 MHz
Max Input : AM standard & AM Balanced : 30 V max
(BNC connector on rear panel )
Frequency Change : 1 : 100 approx.
Input Impedance : 50 k ll 25 pF
Sweep Speed : 20 ms to 4 s
Sweep Range : approx. 1 : 100 approx.
Input Voltage :
Input : 30 V max (Mod connector on rear panel)
Modulation Index : 20 to 80 % or better
±
±
W
±
W
±
±
W W
±
W ±
±
W
±
±
30 V max.
6SM5074/ SM5075User Manual

Pulse Amplitude Modulation
nternal Modulation Generator (SM5075)
:
Amplitude Display :
General Information :
Display :
Supply :
Power consumption :
Operating Conditions :
Dimensions :
Weight :
Input : 30 V max (Mod connector on
rear panel)
Depth of Modulation : 80 % or better
I
Waveforms : Sine, Square, Triangle
Frequency : 20 Hz to 20 kHz
Amplitude : adjustable 2 to 10 Vpp approx.
Internal / External, Auto ranging
Frequency Range : 10 Hz to 40 MHz,
Accuracy : (0.1% + 1 D)
Input Sensitivity : 50 mVrms to 500 mVrms
Max. Input Voltage : 150 Vrms
Input Impedance : 1 M ll 50 pF
Display Range : 20 mVpp-20 Vpp, Accuracy :
2% D
LCD with back lit
230 V 10%, 50 Hz
30 VA approx.
0 to 50 C , RH 95 %
W : 205, H : 95, D : 292 (mm)
2.4 kg (approx.)
( Subject to Change )
±
±
W
± ±
±
Frequency Counter
0
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User Manual SM5074/ SM5075

Front Panel Controls
5074SM
3 z AM FM Function Generator Counter 5074MH SM
8SM5074/ SM5075User Manual
3 MHz AM FM Function Generator Counter SM5074
ON
OFF
Set Parameters
Fun Gen
Sweep
519
18
20
17 6912 13
23
22 15 16
14
24 27
21
26 25
3411 10 87
2
(150 Vrms max)
Power
Auto/Level 1:10
Attenuation
Trigger
Pulse Duty Start/Stop Time
Frequency Counter
Frequency Amplitude Function Offset
Output
Fine
Sweep
Fun Gen Counter
Modulation Offset
X10
20Vpp
max
Output
10

Front Panel Controls
507SM 5
3 zAM FM Function Generator Counter 5075MH SM
9
User Manual SM5074/ SM5075
3 MHz AM FM Function Generator Counter SM5075
ON
OFF
Set Parameters
Fun Gen
Sweep
519
18
20
17 6912 13
23
22 15 16
14
24 27
21
26 25
3411 10 87
2
(150 Vrms max)
Power
Auto/Level 1:10
Attenuation
Trigger
Pulse Duty Start/Stop Time
Frequency Counter
Frequency Amplitude Function Offset
Output
Fine
Sweep
Fun Gen Counter
Modulation Offset
X10
20Vpp
max
Output
10
Mod Gen
28
Mod Gen

Push button switch for supplying power to instrument.
LCD display with back lit.
When pressed function generator mode is selected.
Press to select frequency counter mode.
(BNC CONN.) Input to Counter (max 150 Vrms).
When pressed allow the setting of
frequencies
(Encoder) Variable control for setting the values of
frequency, amplitude, duty cycle, trigger level, offset voltage, width & time
in sweep mode. When any of this push button selected, this variable
control allows setting of values, it gets disabled in 10 sec if no further
variations made or press the same switch again to disable the function.
: Selects the fine adjustment.
: Selects amplitude mode push button is
used to increase or decrease the amplitude by 10times respectively. Variable
control is for setting amplitude.
Pushbutton to multiply the parameter by 10 times.
Pushbutton to divide the parameter by 10 times.
Selection for DC, Triangle, Sine, Square, Ramp, Pulse.
When Pulse function selected the duty cycle can be adjusted
with the help of variable control (encoder) .
Activate/deactivates the internal sweep mode.
: Push button to set the start and stop frequency in sweep
mode.
Setting of time in sweep mode.
Used in frequency counter mode, in normal condition
triggering is automatic and when push button pressed the
trigger level can be set with the help of encoder.
indication for triggered signal in frequency counter mode.
POWER :
DIGITAL DISPLAY :
FUN GEN :
COUNTER :
EXT IN :
FREQUENCY : Variable Control
Variable Control :
FINE
AMPLITUDE X10 & 10
X10 :
10 :
FUNCTION :
PULSE DUTY :
SWEEP :
START/STOP
TIME :
AUTO/LEVEL :
AUTO/LEVEL
LED :
fine control, press FINE pushbutton switch.
÷
÷
SM5074/ SM5075User Manual
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10
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3
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6
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User Manual SM5074/ SM5075
1:10 :
LED :
MODULATION :
OFFSET :
OFFSET
LED
OUTPUT :
LED
OUTPUT
MOD GEN : ( 5075).
When pressed the input signal to the frequency counter is
attenuated 10 times.
Indication for attenuated signal.
Selects external modulation input ( I/P) from rear
panel.
Adjustment of the positive or negative offset voltage in OFFSET
mode by variable control.The max. offset voltage is 5 V (o.c.) or 2.5 V when
terminated with 50
: When selected DC offset voltage superimposed on the final signal
output.
: Indication for offset ON.
The output of the function generator can be switched ON or OFF
by pressing OUTPUT push button.
: Indication for output ON.
(BNC connector) : Short-circuit-proof signal outputof the generator.
The output impedance is 50 and the max. output amplitude is 20 Vpp (o.c.)
or 10 Vpp respectively when terminated with 50 .(For Pulse, the output is 10
Vpp in open circuit and 5 Vpp when terminated in 50 )
When pressedAM generator mode is selected
± ±
W
W
W
W
SM
11
22
19
20
21
28
23
24
25
26
27

12 SM5074/ SM5075User Manual
Rear Panel Controls
SM5074
SM5075
333229
31
TTL
AM/FM/PWM
30
20V /600W
pp
AM OUT
333229
31
TTL
AM/FM/PWM
30
20V /600W
pp
34
Scientific Mes- Technik
Pvt. Ltd.
B- 14, Pologround
Industrial Estate
Indore 452015, India
Power : 230 V, 50 Hz
Watts : 30 VA, (approx)
Fuse : 0.2 A, time lag, 5x20 mm
SM5074
Scientific Mes- Technik
Pvt. Ltd.
B- 14, Pologround
Industrial Estate
Indore 452015, India
Power : 230 V, 50 Hz
Watts : 30 VA, (approx)
Fuse : 0.2 A, time lag, 5x20 mm
SM5075

AM/FM/PWM
OUTPUT
TTL :
Mains
Fuse
AM OUT
(BNC connector) : External input for AM, AM Standard, AM
Balance, FM, PAM, PWM.
(BNC connector) : Short-circuit-proof signal output of the
generator. The output impedance is 600 and the max. output amplitude is
20 Vpp (o.c.) or 10 Vpp respectively when terminated with 600 .(For Pulse
output 10 Vpp in open circuit and 5 Vpp when terminated in 600 ) .
(BNC connector) TTL output synchronous to signal output.
: Mains input 230 V AC 50 Hz 10%.
: Mains fuse assembly. Spare fuse for mains inside.
(BNC connector): Internal Modulation Generator Output.
W
W
W
±
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User Manual SM5074/ SM5075
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33
30
32
31
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Operating Instructions
General Information
Safety
Warning!
Any interruption of the protective conductor inside or outside the
instrument or disconnection of the protective earth terminal is likely to make
the instrument dangerous. Intentional interruption is prohibited. The mains/
line plug should be inserted before connections are made to measuring
circuits.
Operating Conditions
Sm5074/
SM5075
The logical front panel layout of ensures rapid familiarization
with the various functions. However, even experienced operators should not
neglect to carefully read the following instructions, to avoid any operational errors
and to be fully acquainted with the instrument when later in use.
After unpacking the instrument, check for any mechanical damage or loose parts
inside. Should there be any transportation damage, inform the supplier
immediately and do not put the instrument into operation.
The case chassis and all measuring parts are connected to the protective earth
contact of the inlet. The mains plug shall only be inserted in a socket outlet
provided with a protective earth contact. The protective action must not be negated
by the use of an extension cord without a protective conductor.
When removing the metal case or replacing, the instrument must be completely
disconnected from the mains supply. If any measurement or calibration
procedures are unavoidable on the opened-up instrument, these must only be
carried out by qualified personnel acquainted with the danger involved.
The ambient temperature range during operation should be between + 0 to + 50 C
RH 90% should not exceed -40 C or +70 C during transport or storage. The
operational position is optional, however, the ventilation holes on the
must not be obstructed.
SM5074/ SM5075
0 0
0 0
14 SM5User Manual 074/ SM5075

First Time Operation
Mode Selection
Use as Function Generator
.
.
.
After unpacking the instrument check for any mechanical damages. The
instrument should be plugged in mains-plug of proper mains supply 230 V 10%.
Once the instrument is switched ON, the instrument will pass through self test.
This function generator has two modes, namely Function Generator & Frequency
Counter .The required mode can be selected by pressing the corresponding key.
Procedure-
- Connect AC Power mains into receptacle on rear panel and plug into AC inlet.
- Switch ON the RED Power ON switch of On switching,
self test will be displayed and the last settings will be set.
- The desired frequency is selected by pressing FREQUENCY
- push button & then turning variable control . For fine adjustment press
FINE pushbutton The selected frequency appears on the display
Compared to knob scales , this display has a much higher resolution and
accuracy. The accuracy of the displayed signal frequency is order of (
0.1% + 1 D ).
- To select the desired function press FUNCTION pushbutton switch A
signal shape can be selected from different wave form – Sine, Square,
Triangle, Sawtooth, Pulse are available apart from the DC level. The
functions name selected are displayed on the display window. If the
“OFFSET” pushbutton is activated a DC voltage level is supplied by the
is superimposed on the output signal.
- To set the output level, adaptation in decade steps to the desired amplitude
range is performed by the use of pushbuttons & . Including the
continuously adjustable amplitude by Encoder in amplitude mode, the
maximum amplitude of 10 Vpp , the minimum signal voltage to be supplied is
about 10 mV. These values are obtained when the generator output is
terminated with 50 . In the open-circuit condition, the available signal
±
±
W
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SM5User Manual 074/ SM5075
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2
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amplitude is twice as high. Therefore the maximum output voltage of the
output socket is specified with 20 Vpp.
. If these precaution are not observed, additional overshoot may
occur, especially when high frequencies are selected. If test circuit having a
50 input impedance is connected, this termination is not required. In high
signal voltage ranges it should be noted that the used terminating resistor
must dissipate the corresponding effective power.
If the output of the
unit comes into contact with components of the circuit
under test, which are carrying DC voltage, an isolating capacitor of
appropriate dielectric strength should be connected in series with the output
of the generator. The capacitance of this isolating capacitor should be
selected in such way that the frequency response of the output signal is not
affected over the whole frequency range of the unit. By
use of AMPLITUDE pushbutton, select amplitude measurement mode.
This enables display of set amplitude level. The displayed value is peak-to-
peak value and in open circuit mode. If the output is terminated into 50 ,
then the available output is half the displayed value.
There are four basic modulation techniques available in
1. Amplitude Modulation
2. Frequency Modulation
3. Pulse Width Modulation
4. Pulse Amplitude Modulation
Both standard & Balanced Amplitude modulation is
provided. The input BNC connectors are provided on the rear panel. The input
If proper square-shaped signals are
required, care should be taken that only 50 coaxial cables are used.
Furthermore, this cable must be terminated with a 50 input through
termination
W
W
W
W
The output terminal of
the is short circuit proof.
Modulation
Amplitude Modulation :-
SM5074/ SM5075
SM5074/ SM5075
SM5074/ SM5075
SM5074/ SM5075
16 SM5074/ SM5075User Manual
9

BNC connectors are provided on the rear panel. The input signal applied at rear
panel is modulating signal and the carrier frequency is internal frequency
generated by function generator. The upper limit of the carrier may go upto 3 MHz.
Procedure -
- Set up the instrument as described in function generator operation. Use the
frequency and amplitude mode to set the carrier to the desired frequency and
amplitude.
- Connect an AC modulating signal with no DC component to the AM/FM/PWM
input BNC on rear panel of .
- Select AMSTD mode by pressing MODULATION pushbutton.
- Adjust amplitude of the AC modulating signal for the desired Amplitude
Modulation ( Modulation depth or Mod. Index).
AM Standard
SM5074/ SM5075
AM Balance
Procedure -
Set up the instrument as described in function generator operation. Use the
frequency and amplitude mode to set the carrier to the desired frequency and
amplitude.
- Connect an AC modulating signal with no DC component to the
AM/FM/PWM input BNC on rear panel of
- Select AMBAL mode by pressing MODULATION pushbutton
- Adjust amplitude of the AC modulating signal for the desired Amplitude
Modulation.
.SM5074/ SM5075
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User Manual SM5074/ SM5075
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21
AM Standard

The modulating signal is applied to AM/FM/PWM input & FM
mode is selected by MOD pushbutton, then this function generator can be used as
FM Signal Generator.
Procedure -
- Set up the instrument as described in function generator operation. Use t h e
frequency and amplitude mode to set the carrier to the desired
frequency and amplitude.
- Connect an AC modulating signal with no DC component to the
AM/FM/PWM input BNC on rear panel of .
- Select FM mode by pressing MOD pushbutton.
- Adjust amplitude of the AC modulating signal for the desired frequency
deviation.
Frequency Modulation
SM5074/ SM5075
SM5074/ SM5075
18 SM5074/ SM5075User Manual
AM Balance

Pulse Width Modulation
Pulse Amplitude Modulation
.
In PWM the width of pulse signal varies according to the input modulating signal.
Procedure -
- Set up the instrument as described in function generator mode.
- Select the function as Pulse.
- Apply the modulating signal to AM/FM/PWM input BNC at rear panel of the
instrument.
- Select PWM mode by pressing MODULATION pushbutton.
- The input signal applied from rear panel is modulating signal and the carrier
frequency is the function generator frequency which may go up to 3 MHz.
In this modulation, the input is applied via AM/FM/PWM input BNC placed at rear
panel, AM mode is selected by MOD push button and carrier frequency is selected
on front panel.
Procedure -
- Set up the instrument as described in function generator mode.
- Select the function as Pulse.
- Apply the modulating signal to AM/FM/PWM input BNC on rear panel of
- Select AM mode by pressing MODULATION pushbutton.
The input signal applied from rear panel is modulating signal and the carrier
frequency is the function generator frequency which may go up to 3 MHz. In this
type of modulation the amplitude of pulse varies according to the amplitude of
modulating signal wave shape.
SM5074/ SM5075
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User Manual SM5074/ SM5075
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21

External Control VCF
AM/FM/PWM
Computation : N = N + A.U U = (N-N
N
N
U
If a positive DC voltage is applied to the input on the rear BNC of
& FM mode is selected by MOD pushbutton, the generator
frequency increases, a negative DC voltage reduces the frequency. In this way
can be used as External VCF Signal Generator.
Procedure -
- Apply a specific DC voltage at the AM/FM/PWM input BNC on the rear
panel.
- Select FM mode by MODULATION pushbutton.
- The frequency, which will be produced is as described below:-
The frequency displacement depends on the value and polarity of the DC voltage
U and the FREQUENCY setting. The set frequency N ( DC voltage not included )
can be selected at will.
or
= O/P freq. without voltage U
= O/P including voltage U
= voltage at the FM input
A = 740 (Digits/ volt)
This mode can be used in applications where the periodically required frequencies
are to be set. This will eliminate the repetitive setting of frequency from front panel
via Encoder. Instead set the Encoder to min and fed the equivalent DC input from
AM/FM/PWM input at the rear panel in FM mode, the desired frequency will be
SM5074/ SM5075
SM5074/ SM5075
o
o
o
o)/A
±
20 SM5074/ SM5075User Manual
PAM Signal
29