Operating instructions

University of Saskatchewan
Electrical Engineering Laboratory Equipment Manual
Some keys have a number printed in green next to them. To access the
numbers, press the Enter Number key (num annunciator turns on ) and then press the
keys to access the numbers. If you press the Enter Number key by accident, press the
Shift key and then the Cancel key (num annunciator turns off).
This generator will limit the maximum and minimum values. These values will be
limited by the associated values you set or limits of the generator.
The function generator has a fixed output impedance of 50 ohms. You can
specify which load you are terminating the output into, 50 ohm (power-on/reset state) or
High Z. Incorrect impedance matching between the source and the load will result in a
magnitude output which does not match the display value. The generator will output
twice the magnitude displayed on the generator, with the load termination on 50 ohms.
With the load termination setting on 50 ohms and a 50 ohm load on the output,
half the generator’s source voltage is across the generator’s internal output impedance
of 50 ohms and half across the 50 ohm load. The voltage drop across the 50 ohm load
matches the magnitude displayed on the generator.
With the load termination setting on 50 ohms and a high Z load, practically all of
the output voltage is across the load. The voltage across the high Z load is twice the
magnitude displayed on the function generator.
Set the load termination to High Z for a high Z load. The generator’s output
magnitude will match the magnitude displayed on the generator with the load
termination setting on High Z, provided the load is a high Z and not 50 ohms. The
voltage across the load will be half the display value, with a load termination of High Z
and a 50 ohm load. Most devices used in the Lab have a high input impedance.
To select the output termination:
Push the Shift key and then the Menu on/off key to turn on the MAIN MENU.
Move across to D: SYS MENU.
Move down to OUT TERM.
Move down to parameter.
Move across to select 50 OHM or HIGH Z.
Enter to apply and exit menu.