Stanford Research Systems SR830, Manual

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4-12
Front Panel
CH1 Display and Output
[Display]
This key selects the Channel 1 display quantity. Channel 1 may display
X, R, X Noise, Aux Input 1 or Aux Input 2. The numeric display has the
units of the input signal. The bar graph is ±full scale sensitivity for X, R
and X Noise, and ±10V for the Aux Inputs. Ratio displays are shown in %
and the bar graph is scaled to ±100%. See the SR830 Basics section for
a complete discussion of scaling.
OUTPUT OVLD
The OVLD led in the display indicates that the Channel 1 output is over-
loaded (greater than 1.09 times full scale). This can occur if the sensitivi-
ty is too low or if the output is expanded such that the output voltage
would exceed 10V.
AUTO
This indicator is turned while an auto function is in progress.
SYNC
When the synchronous output filter is selected AND the detection fre-
quency is below 200 Hz, then the SYNC indicator will be on. If the detec-
tion frequency is above 200 Hz, synchronous filtering is not active and
SYNC is off.
[Ratio]
This key selects ratio measurements on Channel 1. The Channel 1 dis-
play may show X, R, X Noise, Aux Input 1 or Aux Input 2 divided by Aux
Input 1 or 2. The denominator is indicated by the AUX IN leds above this
key. The Ratio indicator in the display is on to indicate a ratio measure-