Aux Outputs And Inputs - Stanford Research Systems SR810 Manual

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 [Setup]
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 Out] until the Reference display
shows the level of Aux Out 1( as indicated
by the AxOut1 led below the display).
Use the knob to adjust the level to 10.00 V.
Use the knob to adjust the level to -5.00 V.
4. Press [Channel 1 Display] to select
AUX IN 1.
5. Disconnect the DVM from Aux Out 1.
Connect AuxOut 1 to Aux In 1 on the rear
panel.
Aux Outputs and Inputs
When the power is turned on with the [Setup] key
pressed, the lock-in returns to its standard settings.
See the Standard Settings list in the Operation section
for a complete listing of the settings.
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.
Show the level of Aux Out 1 on the Reference display.
Change the output to 10V. The DVM should display
10.0 V.
Change the output to -5V. The DVM should display
-5.0 V.
The 4 outputs are useful for controlling other
parameters in an experiment, such as pressure,
temperature, wavelength, etc.
Change the Channel 1 display to measure Aux Input 1.
The Aux Inputs can read 4 analog voltages. These
inputs are useful for monitoring and measuring other
parameters in an experiment, such as pressure,
temperature, position, etc.
Only Aux Inputs 1 and 2 can be displayed on the front
panel. The computer interface can read all four inputs.
We'll use Aux Out 1 to provide an analog voltage to
measure.
Channel 1 should now display -5 V (Aux In 1).
The Channel 1 display may be ratio'ed to the Aux Input
1 or 2 voltages. See the Basics section for more about
output scaling.
The display may be stored in the internal data buffers
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