Stanford Research Systems SR830, Manual

Page: 68 / 177

4-15
Front Panel
CH2 Display and Output
[Display]
This key selects the Channel 2 display quantity. Channel 2 may display
Y,
θ
, Y Noise, Aux Input 3 or Aux Input 4. The numeric display has the
units of the input signal. The bar graph is ±full scale sensitivity for Y and
Y Noise, ±180 ° for
θ
, 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 2 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.
TRIG
The TRIG indicator flashes whenever a trigger is received at the rear
panel trigger input AND internal data storage is triggered.
[Ratio]
This key selects ratio measurements on Channel 2. The Channel 2 dis-
play may show Y,
θ
, Y Noise, Aux Input 3 or Aux Input 4 divided by Aux
Input 3 or 4. 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-
ment. Pressing this key until the AUX IN leds and the Ratio indicator are
off returns the measurement to non-ratio mode.