TTI TG210 Bedienungsanleitung Seite 6

out (accomplishedby half-depressingany one) the output will be a DC
level only; this is useful as it permits input threshold testing of a circuit
instead of having to connect up an external DC supply.
Main Output
The amplitude of the 500 MAIN output is controlled by the 2-position
ATTENUATOR switch and AMPLITUDE control. Maximum output is 20
volts peak-to-peak from 50Q and 10 volts peak-to-peak when terminated
with a 500 load.
The AMPLITUDE control has greater than 40dB range and used in
conjunction with the ATTENUATOR a •range of OdB to -60dB can be
achieved. This provides a range of 20V peak-to-peak down to 20mV
peak-to-peak, or IOV peak-to-peak down to 10mV peak-to-peak into
500.
Greater attenuation can be achieved by using standard 500 BNC
attenuators. To maintain waveform integrity only 50Q cable should be
used and the receiving end should be terminated with a 50Q load. The
500 MAIN output will withstand a short circuit for a period of 10 minutes
at maximum output and greater periods at lower output levels. However,
damage will occur if an external voltage is connected to the output
socket.
TG210/TG215: The MAIN output is also available from a 600Q socket.
The 500 and 6000 sockets are not independent and should not be
used together.
TG215/TG230: with DISPLAY SELECT set to amplitude.
peak amplitude of the MAIN output is displayed. The display shows
open circuit voltage (emf); the actual voltage at the socket will be half
the displayed value when the output is terminated with its characteristic
impedance.
DC Offset
The bC OFFSET controlhas a rangeof
output modes; the control has a centre detent for 0 volts. DC offset plus
signal peak is limited to *IOV
the peak-to-
voltsfrom50Q/600Q in all
(±5V into the characteristic output
impedance).DC offset plus waveformis attenuatedproportionallyin the
-20dB position.
TG215/TG230.• with DISPLAYSELECT set to DC offset,the offset level of
the MAIN output is displayed. The display shows open circuit voltage
offset (emf);the actual voltage at the socket will be half the displayed
value when the output is terminated with its characteristic impedance.
Aux Output
The AUX output provides a fixed Oto 5V TTL/CMOS pulse output at the
samefrequency, s ymmetryand phaseas the 500 MAINoutputand is
capable of driving 4 standard ITL loads.
Sweep Input
The generator f requencycan be swept,DC programmed or modulated
by a suitablecontrolvoltage applied to the SWEEPIN socket.The
instrument sums the SWEEP IN voltage with the internal control voltage
derived from the FREQUENCY
frequency.With the DISPLAYSELECTswitch in the frequency position
on TG215/TG230, the display shows the resultant frequency. A positive
voltage increases the frequency; for frequency control with positive-
going DC inputs the vernier should therefore be set to the lower
frequencylimitof the range to be swept. For example,a OVto +3V
signal will sweep the generator3 decades up from range minimum,set
by the vernier, to range maximum.
Similarly,a negativevoltage decreasesthe frequencyand for negative-
goingDCinputs thevernier s houldbe settotheupperfrequency limitof
the range to be swept. For example, a OVto -3V signal will sweep the
generator3 decades down from range maximum,set by the vernier,to
range minimum.
To use a sweep signal which is symmetrical about ground, the vernier
should be set to give a frequency at approximatelythe centre of the
band to be swept.
Note: Non-linear operation may result when the sweep input voltage is
excessive; that is, when the attempted generator frequency exceeds the
range limits.
vernier to determine the operating
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