THURLBY THANDAR INSTRUMENTS
TG550 Advanced 5MHz Function Generator with Sweep
Thurlby Thandar Instruments Ltd. operates a policy of
continuous development and reserves the right to al-
ter specifications without prior notice.
Designed and built in the EEC by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE18 7DX England
Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409
e-mail: sales@ttinst.co.uk Web: http://www.ttinst.co.uk
FREQUENCY
Frequency Range:
0.005Hz to 5MHz in 7 overlapping decade
ranges with fine adjustment by verniers.
Vernier Range: 1000:1 on each range.
FREQUENCY LOCKING
Operating Range: 0.5Hz to 5MHz with vernier set-
ting within 10% to 100% of
range maximum.
Locking Accuracy: Better than 0.01% of displayed
value.
DISPLAY
LCD, 8 digits (11mm high) plus 14 annunciators
METER FUNCTIONS (generator mode)
Frequency:
Auto-ranging reciprocal measurement giving 4
digit resolution for frequencies down to 1Hz;
maximum resolution is 0.001Hz. Accuracy ±1
digit 0.2Hz to 5MHz; accuracy ±1% of range
below 0.2Hz
Amplitude:
Display shows peak-to-peak amplitude or rms
value. Display corrected for attenuator setting.
3-digit resolution, accuracy typically 5% of
range
DC Offset:
3-digit resolution; accuracy typically ±2% of set-
ting ±1 digit. Display corrected for attenuator
setting
OUTPUTS
MAIN - 50 Ohm
Amplitide
2mV to 20V peak-peak open circuit (1mV to
10V peak-peak into 50Ω) in four
switch-selectable ranges with 20dB vernier
control within each range
Attenuator Ranges: 0dB, -20dB, -40dB, -60dB
DC Offset Range:
±10V from 50Ω. DC offset plus signal peak lim-
ited to ±10V (±5V into 50Ω). DC offset plus
waveform attenuated proportionally by the at-
tenuator.
MAIN - 600 Ohm
Alternative output socket offering the same facili-
ties as the 50Ωsocket.
AUX OUT
0 to 5V TTL/CMOS logic levels capable of driving 2
standard TTL loads. Frequency, symmetry and
phase as main outputs
SWEEP OUT
3V ramp from 600Ω
EXTERNAL COUNTER
Frequency Range: 5Hz to20MHz, fully autoranging
Input Sensitivity: 50mV rms (sinewave)
Measurement Time: Selectable 0.5s or 5s
Resolution: 6 digits in 0.5s; 7 digits in 5s
Accuracy: ±1 digit ± timebase accuracy
Timebase Accuracy:
±10ppm initial error; ±5ppm/year ageing rate;
typically less then 0.5ppm/oC. Adjustment point
for closed-case recalibration
OPERATING MODES
Specifications apply for the top decade of each
frequency range and maximum output into 50Ω
termination.
SINE
Distortion:
<0.5% on 500, 5k and 50k ranges; <1% on 5,
50 and 500k ranges; all harmonics >25dB be-
low fundamental on 5M range.
Amplitude Flatness:
±0.2dB to 200kHz; ±2dB to 5MHz.
TRIANGLE
Linearity: Better than 99% to 200kHz
SQUARE WAVE
Rise and Fall Times:<45ns
Mark - Space Ratio: 1:1 ± 1%to 100kHz
DC
Range: ±10V unterminated
SYMMETRY
Symmetry Range:
Variable typically 1:9 to 9:1 (on top decade of
each range), frequency divided by 10.
SWEEP MODES
INTERNAL
Sweep Range: >1000:1 within each range.
Sweep Rate:
Adjustable, typically 20ms to 20 secs.
Sweep Mode:
Linear or logarithmic. Sweep start and stop
frequencies displayed by button press.
EXTERNAL
Input Impedance: 10kΩ
Input Sensitivity: 0 to3V for 1000:1 sweep
Max. Input Voltage: ±10V
Sweep Linearity: Better than 1%
Max. Voltage Rate: 0.1V/us
AMPLITUDE MODULATION
Depth: Variable 0 to 100%
Frequency:
400Hz (internal). DC to 100kHz (external).
External Sensitivity:
Approx. 2V peak-to-peak for 50% modulation.
GENERAL
POWER REQUIREMENTS
Input Voltage:
230V or 115V nominal 50/60Hz, by internal
adjustment; operating range ±14% of nominal.
Installation Category II.
Consumption: 25VA max.
ENVIRONMENTAL & MECHANICAL
Operating Range: +5oCto+40
oC, 20% to 80%
RH.
Storage Range: -10oCto+65
oC
Environmental:
Indoor use at <2000m, Pollution degree I
Safety: Complies with EN601010-1
EMC: Complies with EN50081-1 &
EN50082-1
Size: 260(W) x 88(H) x 235(D)mm
(10.2 x 3.4 x 9.2"), excluding
handle and feet.
Weight: 1.9kg (4.2lb) approx.
CLIP
DC
INT-AM-EXT
mVrms
FUNCTION ATTENUATOR
FREQUENCY RANGE
5Hz
ON (f/10) 50Hz 500Hz 5kHz 50kHz 500kHz 5MHz -20dB-40dB
DC OFFSET
SYMMETRY
AM / EXT COUNTER
INT
EXT
SET STOPSET START
LOCK
LIN
INT ON
OFF
RATE
SWEEP
FINE
(START)
LOCKED
READY
maxmax
o
FREQUENCY
STOP
MAIN OUTMAIN OUT
TTL/CMOS
AUX OUT
AMPLITUDE
TG550 FUNCTION GENERATOR
2.5 3.0
2.0
1.5
1.0
0.5
0.05
0.005
3.54.0
4.5
5.0
EXT AM
COUNT
EXT IN
AM
SWEEP IN/OUT 50W
600W
LOG
EXT
mVp-p
MHz
PRECISION COUNTER / CRYSTAL FREQUENCY LOCK
GATE TIME
(ext counter)
OFFSET
CAL
PK-PK/RMS
EXT COUNTER (5Hz -20MHz)LEVEL
●0.005Hz to 5MHz frequency range
●Simultaneous display of frequency & level
●Frequency locking for increased stability
●Precision internal linear or logarithmic sweep
●External counter with 7 digit resolution
●Very high waveform quality throughout range
●20V pk-pk from 50/600 Ω, plus TTL/CMOS
●1000:1 frequency change by vernier or sweep
●lnternal or external amplitude modulation
The TG550 represents the state-of-the-art in
5MHzanaloguefunctiongenerators. Itprovides
very high waveform quality at all frequencies
and levels.
ThelargeLCDdisplayprovidesadigitalreadout
of both frequency and level (peak-to-peak am-
plitude, rms amplitude or dc offset).
Advanced measurement techniques are used
to provide high accuracy with fast update even
at low frequencies.
The TG550 includes a digital frequency locking
system that gives it a level of frequency stability
that cannot be matched by conventional ana-
logue function generators.
Once the frequency has been set, pressing the
Lock key engages a measure-and-correct circuit
which compensates for the small thermal and
mechanical drifts that inevitably occur in an ana-
logue generator.
The frequency is compared to a crystal controlled
referenceand is maintainedto within0.01% ofthe
set frequency.
Anexternal countermode isavailable which uti-
lises the full width of the display to provide up to
seven digits of resolution. A reciprocal counting
measurement system is used which ensures
high resolution regardless of input frequency.
Thus, for example, mains frequency can be
measured to a resolution of better than 1mHz.
Note: This is a faxable data sheet, a colour
brochure is also available.
