Stanford Research Systems SR865A, Operation Manual

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28 Getting Started Chapter 1
SR865A DSP Lock-in Amplifier
Aux Outputs and Inputs
This measurement is designed to illustrate the use of the Aux Outputs and Inputs on the rear panel. You
will need BNC cables and a digital voltmeter (DVM).
Specifically, you will set the Aux Output voltages and measure them with the DVM. These outputs will
then be connected to the Aux Inputs to simulate external dc voltages which the lock-in can measure.
Do This Explanation
1. Disconnect all cables from the lock-in. Turn the
power on while holding down the [Local] key.
The power switch is on the power entry module
on the rear panel. When the power is turned on with [Local]
pressed, the lock-in returns to its standard
default settings. See the Standard Settings list in
the Operation section for a complete listing of
the settings.
2. Connect Aux Out 1 on the rear panel to the
DVM. Set the DVM to read dc volts. The 4 Aux Outputs can provide programmable
voltages between − 10.5 and +10.5 volts. The
outputs can be set from the front panel or via
the computer interface.
3. Press [Aux Output] to show the Aux Output
keypad. Aux Outputs are easily set from the front panel.
4. Touch {1}{0}{Enter} to set Aux 1 to 10.000 V. The DVM should display 10.00 V.
Use the <Cursor> knob adjust the level to
5.000 V. The <Cursor> knob is used to adjust values
when the Aux Output keypad is shown.
The DVM should display 5.00 V.
The 4 Aux Outputs are useful for controlling
other parameters in an experiment, such as
pressure, temperature, wavelength, etc.