TOE 7404
Function Generators
The TOE 7404 function generator is a compact, rugged and low-cost signal source designed to meet everyday practical requirements.
The outstanding feature of these instrument 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 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.
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| Variable symmetry with triangle und square |
Functions and operating modes
| Functions | Sine, triangle, square, pulse, amplifier, DC, variable symmetry |
| Operating modes | Free-running, external sweepfrequency control, amplifier mode, frequency counter |
| Frequency characteristics | |
| Frequency range | 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 | < 28 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 |
| 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 |
Ordering data
| Function generator | TOE 7404 |
Options
| TOE 9008 | Carrying handle |
| TOE 9501 | 19" adapter, 3 HU |
| TOE 9503 | 19" rack module, 4 HU |