10 MHz AM FM FUNCTION GENERATOR COUNTER SM5078 Table of Contents 1. 2. 3. 4. 5. Introduction ,........................... TechnicalSpecifications .......................... FrontPanel Controls "... """"".. Rear Panel Controls................................ Operation """ """""" """" General Information.................................... Safety ..,... ...,.. ......... OperatingConditions """"""""""""","'" FirstTime Operation , ,... ... ..,... ... ..... ModeSelection ","""""""""""""""""" Use as Function Generator... ... ... .., .., ... ... .... Modulation """"""",,"""""""""""""""" AmplitudeModulation """""""""""""""" AMStandard ,""""""""""""""""""""'" AMBalanced , ,......................... Frequency Modulation... ,. ... ... ..... Pulse Width Modulation ."""""""" ............. Pulse AmplitudeModulation ... """ ........ ExternalControlVCF ,......................... Use as Programmed Frequency Generator '" Use as Sweep Function Generator... .., ... ... ... DC Offset ',.., ', "'..""'" ........... TriggerOutput ,, ,,.. ..,..,... ,.. ... ,.. , Use as ExternalFrequencyCounter.., .... Maintenance " ,..., ,. Power Line Fuse Replacement ... ... ... ... ... ... Despatch Procedure for Service... ... ... ..... List of Service Centers ... ... ... ............. 6. 7. 8. Aug 2006 Edition Rev 1,2 2 3 4 8 10 11 11 11 12 12 12 12 15 15 15 16 16 17 17 18 19 20 20 21 21 22 22 23 24 !III I. . INTRODUCTION 10 MHz AM FM FUNCTION GENERATOR COUNTEB SM5078 . Frequency Range 0.5 Hz to 10 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, TIL, DC . Digital Frequency Readout. Digital Amplitude Readout . DC-Offset Adjustment . Internal Sweep Facilities. Square Wave Risetime Typ. 35 ns The various signals available from the SM5078 AM FM 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. Frequencies are read out on a 5 digit LED dIsplay with a maximum resolution of 1 mHz. Additional quality features include the relatively low distortion factor of the genera~ed signals and constant amplitude flatness throughout the entire frequency range of the instrument. All outputs are short-circuit-proof in SM5078. The SM5078 can also be used in the sweep mode with an internal or external signal source. 3
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Use as Sweep Function Generator... .., ... ... ...DC Offset ',.., ' , "'..""'" ...........
TriggerOutput , , , ,.. ..,..,... ,.. ... ,.. ,
Use as ExternalFrequencyCounter.., ....Maintenance " ,..., ,.Power Line Fuse Replacement ... ... ... ... ... ...Despatch Procedure for Service... ... ... .....List of Service Centers ... ... ... .............
@ MODE: When pressed function generator, frequency counter or
amplitude display mode is selected,
@ LEVEL (adjusting knob): When TRIG pushbutton pressed, the
trigger level can be set
@ 1:10: When pressed the input signal to the frequency counter is
attenuated 10 times.
@ SPEED: Setting of wobbulation speed in Sweep mode,
@ FUNC : Function s'election switch (DC, Triangle, Sine, Square,
@ I @i~,I~) (~
Ramp, Pulse),
@ SWEEP: Activates the internal Sweep mode,
POWER: Push buttonswitch for supplyingpowerto instrument
@ DIGITAL DISPLAY: 5 digit for function generator, 5 digit forfrequency meter & 3 digit for amplitude display, LED indicatorsfor operatingmodes,functionsand'units display.
@ Trig: Used in Frequency Counter mode, in normal condition
triggering is automatic, and when pushbuttonTRIG pressed the
trigger level can be set with the help of LEVEl.LEO indicationfor
triggeredsignal.
@ & @ RANGE: Frequencyrangeselection from 0.5 Hz to 10 MHz
in 8 decadesteps.
@ FREQUENCY: (adjusting knob) Continuous and linear
frequency fine adjustment, overlapping the ranges selected,
Setting rangefrom xO.09 to x 1.1( approx.)of the selectedrange.
<1) EXT IN (BNC CONNECTOR):- Input to frequency Counter(MAX
150Vrms)
@ WIDTH: Setting of wobbulation width in sweep mode.
@ INV: When selected inverts the Pulse / Ramp output
@ PULSE D1: When Pulse function is selected the duty cycle can
be adjusted with the help of PULSE DT potentiometer.
@ OFFSET: When selected DC offset voltage is superimposed on
the final signal output
@ OFFSET (Potentiometer control) Adjustment of the positive or
negative offset voltage in OFFSET mode. The max. offset voltage
is:t 5V (o.c.) or :t 2.5V when terminated with 50 Q.
@ AMPLITUDE: Continuous adjustment of the output amplitude
from 0 to - 20 dB .
@ 50Q/600Q: Selectsthe output impedanceat the output BNC..= ,
~ TTL : TTL synchronousoutputto the signaloutput
@ & @ -20 dB : When pressed the output sigflal gets attenuated
8 9
by 20 dB fixed attenuator. When both attenuator pushbuttons are
activated, a total attenuation of 40 dB results. Including the
amplitude control @ the max. attenuation amounts to 60 dB
(factor 1000).
@ OUTPUT (BNC connector): Short-circuit-proof signal output of
the generator. The output impedance is 50 0/6000, and the max.
output amplitude is 20 Vpp (o.c.) or 10 Vpp respectively when
terminated with 50 0.( For Pulse output 10 Vpp in open circuit
and 5 Vpp when terminated in 50 0)
OPERATION
General Information
The logical front panel layout of SM5078 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.
Safety
The case chasis 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.
REAR PANEL CONTROLS
1(1
@ FM (BNC connector): External inputfor FM.@ AMBAl (BNC connector) : external inputfor AM Balance.
@ PWM (BNC connector): External inputfor PWM .
@ AMSTD (BNC connector) : Externalinput for AM Standard.
@ Mains:Mainsinput230VAC50 Hz:!:10%.
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.
When removing the metal case or replacing, the instrument must be
completely disconnected from the mains supply. If any measurement
@ Fuse: Mainsfuse assembly. Sparefuse for mains is keptinside.