Aux Outputs and Inputs

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.

1.Disconnect all cables from the lock-in. Turn the power on while holding down the [←] (backspace) key. Wait until the power-on tests are completed.

2.Connect Aux Out 1 on the rear panel to the DVM. Set the DVM to read DC volts.

3.Press [AUX OUTPUTS] Press <Voltage> Press [1] [0] [ENTER]

When the power is turned on with the backspace key depressed, the lock-in returns to its default settings. See the Default Settings list in the Menu section for a complete listing of the settings.

The 4 Aux Outputs can provide programmable voltages between -10 and +10 volts. The outputs can be a fixed voltage or they can sweep with the scan.

Display the Aux Output menu.

Highlight the output voltage of Aux Out 1.

Change the output to 10V. The DVM should dis- play 10.0 V. The knob can also be used to adjust the voltages.

Press [-] [5] [ENTER]

Change the output to -5V. The DVM should dis-

 

play -5.0 V.

 

The 4 outputs are useful for controlling other

 

parameters in an experiment, such as pressure,

 

temperature, wavelength, etc.

4. Press [DISPLAY/SCALE]

Show the Display and Scale menu.

Press <Monitor> to select Input/Output.

Change the monitor display at the top of the

 

screen to show the Aux Inputs (A1, A2, A3 and

 

A4).

 

The Aux Inputs can read 4 analog voltages. These

 

inputs are useful for monitoring and measuring

 

other parameters in an experiment, such as pres-

 

sure, temperature, position, etc.

 

We'll use Aux Out 1 to provide an analog voltage

 

to measure.

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SRS Labs SR850 manual AUX Outputs and Inputs, Aux Outputs and Inputs
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SR850 specifications

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