TOELLNER Electronic Instrumente GmbH - Test- and measurement


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Function generators, 5 MHz
with integral feedback voltage protection - TOE 7402 / TOE 7404

Overview

The TOE 7402 and TOE 7404 function generators are compact, rugged and low-cost signal sources designed to meet everyday practical requirements.
The outstanding feature of these instruments is the frequency counter with LED for measuring both internal and external signal frequencies.
The high output voltage of max. Vpp = 30 V will satisfy the requirements of most general-purpose laboratory or service tasks as well as the needs of applications in production plants or educational institutions. All inputs and outputs are absolutely no-load and short-circuit proof. The output amplifiers are guarded against dangerous feedback by an integral external voltage protection feature.
These generators have a frequency range of 0.5 Hz to 5 MHz and generate the following output functions: sine, triangle, square, pulse, amplifier and bipolar DC voltage.


When in amplifier mode, the instruments perform as a broadband amplifier from DC up to approx. 5 MHz. All front panel input and output sockets are floating.
The TOE 7404 function generator corresponds to the standard TOE 7402 unit. In addition, it has an extended frequency range down to 50 mHz and a variable symmetry adjustment. The latter facility allows the generation of positive and negative pulses as well as rising or falling sawtooth functions in addition to the fundamental sine, triangle and square functions.

Technical data

Functions and operating modes
Functions Sine, triangle, square, pulse, amplifier, DC, variable symmetry (TOE 7404)
Operating modes Free-running, external sweepfrequency control, amplifier mode, frequency counter
Frequency characteristics  
Frequency range TOE 7402 0,5 Hz to 5 MHz
TOE 7404 0,05 Hz to 5 MHz in 6 decadic subranges
Frequenzoffset ± 2 %
Frequency error ± 2 Digit. < 5 % of full-scale value when using the scale
Drift 1 x 10-3/K up to 500 kHz
3 x 10-3/K to 5 MHz
5 x 1O-3 in 8 hours, in each case following 30 min warm-up time
Function output  
Output amplitude Vpp = 10 mV to 30 V, 15 V in pulse mode
Output impedance 50 Ohms. The output is no-load and short-circuit proof
Feedback voltage protection up to ± 120 V
DC offset 0 to ± 10 V 
Output attenuator 30 dB continuously adjustable plus 20 or 40 dB steps, frequency response (sine, triangle):
0,03 dB, or 0,5 dB above 1 MHz 

Function specificationn
at max. output voltage and 50 Ohm load
Sine  
Klirrfaktor < 0,5 % up to 100 kHz 
< 5 % up to 5 MHz
Triangle  
Linearity error < 1 % to 100 kHz
Symmetry error < 1 % to 100 kHz
Square  
Transition time < 35 ns
Overshoots < 5 %
Pulse See square
Symmetry variation
(TOE 7404 only)
10 % to 90 %
for frequencies up to 500 kHz

Amplifier
Gain Approx. 17 dB
Frequency range DC up to 5 MHz
Distortion factor < 0,2 % up to 100 kHz
Input impedance 10 kOhms

Other signal inputs and outputs
Synchronizing signal output TTL compatible, output impedance 50 Ohms, fan out: 5
VCO modulation input Approx. 5 V for a frequency variation ratio of 1000:1
OCV output 0 to 5 V output voltage for a frequency change 1:1000
EXT IN Amplifier input, max. input voltage 15 Vrms, frequency counter input

Frequency counter mode
Frequency range < 1 Hz to 30 MHz
Resolution 4-/5 digits with autoranging
Accurac ± 2 digits
Sensitivity 150 mVrms < 10 MHz
250 mVrms > 10 MHz
Input impedance 1 MOhm II 120 pF 
Input protection Up to 15 Vrms

General data

Line voltage 115 V / 230 V ± 10 %, 47 Hz to 63 Hz
Power consumption 30 VA
Operating temperature 0 °C to 50 °C 
Dimensions
(W x H x D)
265 x 147 x 280 mm
Weight Approx. 3,5 kg
Housing Aluminium

Order informations + Options

Ordering data

Function generator TOE 7402
Function generator TOE 7404


Options

TOE 9008 Carrying handle
TOE 9501 19" adapter, 3 HU
TOE 9503 19" rack module, 4 HU

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