TOELLNER Electronic Instrumente GmbH - Test- and measurement


Goto...
  1. Content
  2. Main navigation
  3. Service navigation
  4. Service search (Alt+S)

Service navigation

Synthesizers/function generators with
sweep, trigger, AM and frequency counter - TOE 7704 to 7711 A

Overview

The function generators of the TOE 7700 range represent a series of completely novel design.
In addition to the usual standard signal shapes including variable signal symmetry, this range is equipped with a lin/ log sweep oscillator which should satisfy the most demanding users.
Continuous or triggered sweeping is selectable, the lower and upper sweep limits are of course separately adjustable, and the sweep frequencies are precisely displayed by an integral frequency counter.
Many details reflect the latest advances in circuit technology: a wear-free spinwheel for adjusting the output frequency and sweep time, an internally or externally usable frequency counter that employs a reciprocal counting method, and sophisticated new switching techniques allow signal qualities that were previously unattainable.

All inputs and outputs are floating, with the most important ones arranged on the front panel for ease of operation. A wide frequency range, an outstanding processing quality, and the clear and balanced design of the control panel round off the concept of these function generators.
The TOE 7706, TOE 7708 A and TOE 7711/7711 A models also offer signal triggering and gate mode.
The TOE 7708 A and TOE 7711 A models are additionally able to work in amplitude modulation mode, resulting in a significantly wider range of application.
The TOE 7711/7711 A microprocessorcontrolled synthesizers/function generators combine the variety of functions that characterize universal function generators with the stability of modern synthesizers. In PLL mode, the output frequency is controlled with crystal accuracy in the 10 Hz to 44 MHz range. The basic accuracy is 2 x 10-6 of the full-scale value, and the aging rate is only 2 ppm/year.

Special features
-
Frequency range 1 mHz to 44 MHz
- Sweep, trigger, gate
- Variable symmetry
- Digital display of frequency, sweep, AC, DC
- Amplitude modulation
- Frequency counter up to 50 MHz

Models

  TOE 7704  TOE 7706   TOE 7707  TOE 7708 A   TOE 7711  TOE 7711 A 
Frequenz Min (mHz)
                  Max (MHz)
1
12
1
12
1
22 
1
22
1
44
1
44 
Synthesizer        
Frequenz counter         
Signal waveforms            
Sine, triangle, square
Pos./neg. Pulse
TTL, ECL
Output (Vpp) > 30 V > 30 V > 20 V > 20 V  > 20 V  > 20 V
Operating modes            
Trigger/gate    
Lin/log Sweep
VCO, external
Amplitude modulation        

Technical data

Functions and operating modes
Functions Sine, triangle, square, pos./neg. pulse, TTL, ECL, variable symmetry, DC
Operating modes Continuous, internal and external sweep-frequency control, amplifier mode, frequency counter
Trigger and gate modes TOE 7706, TOE 7708 A, TOE 7711, TOE 7711 A
Amplitude modulation TOE 7708 A, TOE 7711 A
Synthesizer mode (PLL) TOE 7711, TOE 7711 A
Frequency characteristics  
Frequency range  
TOE 7704, TOE 7706 1 mHz to 12 MHz (sine, triangle, square, pulse, TTL, ECL)
TOE 7707, TOE 7708 A 1 mHz to 22 MHz (sine, triangle, square, pulse, TTL, ECL)
TOE 7711, TOE 7711 A 1 mHz to 44 MHz (pulse, TTL, ECL) 1 mHz to 22 MHz (sine, triangle, square)
Resolution 3 ½ digits, 4 ½ digits in PLL mode
Frequency error ± 1 LSD, 2 x 10-6 in PLL mode, 5 % of full-scale value 1 mHz bis 10 Hz
Drift 5 x 10-8/K, 2 ppm/year in PLL mode, 10-3/K < 1 MHz, 3 x 10-3/K > 1 mHz, 5 x 10-3/ 8h free-running; in each case following 30 min warm-up time
Function output
Output amplitude
 
TOE 7704, TOE 7706  10 mVpp to 30 Vpp, 5 mVpp to 15 Vpp in pulse mode (open output)
TOE 7707, TOE 7708 A,
TOE 7711, TOE 7711 A
7 mVpp to 20 Vpp, 3 mVpp to 10 Vpp in pulse mode (open output)

Output impedance

50 ohms/600 ohms (switchable), the output is short-circuit and no-load proof
Feedback voltage protection up to ± 120 V (optional) 
DC offset 0 V to ± 10 V 
Output attenuator 30 dB continuously adjustable plus 20 dB, 40 dB fixed attenuator (max. 70 dB)
Accurancy ±5 % (at max. amplitude; at 1 kHz for sine and triangle)
Drift ± 0,05 % of full-scale value within 10 min ± 0,3 % of full-scale value within 8 hours
Frequency response  
Sine ± 0,5 dB, ± 2 dB above 1 MHz 
Triangle ± 0,5 % dB, ± 2,5 dB above 1 MHz
Display The output voltage is displayed in Vpp or in ± V (for DC). The max. error is ± 5 % of full-scale.
Function specification at max. output voltage and Zo = ZL = 50 ohms
Reference temperature 23 °C ± 1 °C
Sine  
Distortion factor ≤ 0,5 % up to 100 kHz, all harmonics are 26 dB below the fundamental wave up to 12 MHz (TOE 7704, TOE 7706), or up to 22 MHz (TOE 7707, TOE 7708 A, TOE 7711,TOE 7711 A)
Triangle Linearity and symmetry error ≤ 1 % up to 100 kHz 
Square / Pulse
Transition time (10 % bis 90 %) typ. 10 ns Overshoots < 5 %
TTL OUT   
Output level 0 V/5 V (typ) 
tr/tf  ≤ 5 ns, output impedance Zo = 50 ohms, load impedance ZL ≥ 50 ohms
ECL OUT   
Output level - 0,9 V/-1,8 V (typ) 
tr/tf  ≤ 2 ns, output impedance 50 ohms, load impedance ≥ 50 ohms
Variable symmetry Continuously adjustable from 10 % to 90 % 
All functions  
fmax  1.2 MHz (TOE 7704, TOE 7706) 
fmax   2.2 MHz (TOE 7707, TOE 7708 A, TOE 7711, TOE 7711 A) 
DC voltage 3 ranges with Zo = 50 Ohm/600 Ohm, 0V to ± 0,1 V, 0V to ± 1 V, 0V to ± 10 V 
Operating modes  
TOE 7704, TOE 7707 Sweep, amplifier mode, frequency counter, VCO
TOE 7706, TOE 7708 A,
TOE 7711, TOE 7711 A 
Sweep, amplifier mode, trigger and gate modes, AM internal and external (only TOE 7708 A, TOE 7711 A), synthesizer mode (PLL with TOE 7711, TOE 7711 A), frequency counter
Sweep mode All functions, lin/log, rising, falling, continuously adjustable for internal and external trigger, hold, reset
TOE 7704, TOE 7706 1 mHz to 12 MHz
TOE 7707, TOE 7708 A,
TOE 7711, TOE 7711 A
1 mHz to 22 MHz
Sweep time 1 ms to 1000 s
Resolution 2 digits
Error 5 x 10-5
Sweep range 3 decades (log), 2 decades (lin)
Frequency output voltage Approx. 0 V (start frequency) to + 5 V (stop frequency)
Pen lift output TTL Pegel, 0 V (return)
   
Amplifier mode   
Amplifier
TOE 7704, TOE 7706 
Approx. 17 dB, DC up to ≤ 12 MHz 
TOE 7707, TOE 7708 A,
TOE 7711, TOE 7711 A
Approx. 14 dB, DC up to 12 MHz Distortion factor < 0,2 % up to 100 kHz, input via “EXT IN“
Trigger and gate modes TOE 7706, TOE 7708 A, TOE 7711, TOE 7711 A 
Trigger Manual, externally via “EXT IN“, or internally with the integrated sweep oscillator.
Max. signal frequency
approx. 12 MHz (TOE 7706),
approx. 20 MHz (TOE 7708 A, TOE 7711, TOE 7711 A) 
Gate enable Manual, internally with the integrated sweep oscillator, or externally via “EXT IN“. Duty cycle 50 %.
Max. signal frequency
approx. 12 MHz (TOE 7706)
approx. 20 MHz (TOE 7708 A, TOE 7711, TOE 7711 A) 
Tripping voltage TTL level
Start phase - 90 ° to + 90 °, continuously adjustable
Amplitude modulation (only TOE 7708 A, TOE 7711 A) 
Internal AM  
Frequency range 1 mHz to 22 MHz carrier frequency, all functions except pulse, TTL, ECL
Modulation frequency 1 kHz 
Modulation factor 0 % to 100 % 
External AM  
Frequency range 1 mHz to 22 MHz carrier frequency, all functions except pulse, TTL, ECL
Modulation frequency DC up to 500 kHz
Modulation factor 0 % to 200 %
Modulation voltage 2.5 Vpp for 50 % AM

Synthesizer mode (PLL)
(only TOE 7711, TOE 7711 A).
In PLL mode, the output frequency is controlled with crystal accuracy. Short-term and long-term errors are negligibly small compared to the display resolution.
Frequency range 10 Hz to 44 MHz
Resolution 4½ digits, autoranging
Frequency error < 2 ppm
Drift 5 x 10-8/K
Aging ≤ 2 ppm/year

Frequency counter mode
Frequency range 10 Hz to 50 MHz, reciprocal counting method
Resolution 4½ digits, autoranging
Input voltage TTL level
Gate time 0.5 s
Time base error < 10-5
Aging < 5 ppm/year
Input Impedance 10 kohms
Input protection Up to 15 Vrms


Trigger and gate modes




Manual, externally via “EXT IN“ or internally with aid of integral sweep oscillator. Duty cycle of 50 % required for gate mode.
Max. signal frequency
approx. 12 MHz (TOE 7706)
approx. 20 MHz (TOE 7708 A, TOE 7711, TOE 7711 A).
Amplitude modulation




Internal AM
1 mHz to 22 MHz carrier frequency (TOE 7708A, TOE 7711A),
all functions except pulse, TTL, ECL
Modulation frequency: 1 kHz
Modulation factor: 0 to 100 %




External AM
1 mHz to 22 MHz carrier frequency (TOE 7708A, TOE 7711A),
all functions except pulse, TTL, ECL
Modulation frequency:: DC up to 500 kHz
Modulation factor: 0 bis 200 %
Modulation voltage: 2,5 Vpp for 50 % AM
Sweep modes
 
   
   
   

General data

Line voltage 115 V / 230 V ± 10 %, 47 Hz to 63 Hz
Power consumption 40 VA
Operating temperature 0 °C to 50 °C 
Reference temperature 23 °C ± 1 °C
Storage temperature - 20 °C to + 70 °C 
Dimensions
(W x H x D)
265 x 147 x 330 mm
Weight 5 kg
Housing Aluminium

Order informations + Options

Bestellangaben

Function generator TOE 7704
Function generator TOE 7706
Function generator TOE 7707
Function generator TOE 7708 A
Function generator TOE 7711
Function generator TOE 7711 A


Options

TOE 7700/101 Feedback voltage protection
TOE 9008 Carrying handle
TOE 9501 19" adapter, 3 HU
TOE 9503 19" rack module, 4 HU

Page navigation