Stanford Research Systems SR830, Manual

Page: 26 / 177

2-15
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.
When the power is turned on with the [Setup] key
pressed, the lock-in returns to its standard set-
tings. 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 out-
puts 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 dis-
play 10.0 V.
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.
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 pres-
sure, temperature, position, etc.
We'll use Aux Out 1 to provide an analog voltage
to measure.
Channel 1 should now display -5 V (Aux In 1).
Aux Outputs and Inputs