Newport 1936-R series User Manual

Performing Basic Measurements 71 71
5.10 RMS Measurements
This section describes the procedure for making a basic signal RMS (Root
Mean Square) measurement while properly removing the influence of
ambient light and other drift effects. The 1936/2936 Series begins and ends
the signal RMS every second.
With a 918D or 818P Detector connected to the meter, turn the meter on. Set
the Mode to RMS. Set the Range to Auto and press the Lambda (λ) key to set
the measurement wavelength to the desired value.
Cover or otherwise block the light source being measured, turn Zero on.
Immediately upon entering the RMS mode, the meter will begin to acquire
and calculate RMS value of the data. The display value may reflect the RMS
of noise due to ambient temperature fluctuations (when using the 818P
detectors) or light fluctuations (when using the 918D detectors).
Uncover or trigger the source. The displayed value should now reflect the
detector signal RMS value.
The RMS value is calculated based on data acquired over a one second time
period. The formula used to calculate the RMS value is given below:
n
x
y
n
i
i



0
2
Where x
i
is the signal measured, n is the number of samples acquired over a
one second period, and y is the RMS value.
NOTE
This process assumes that ambient signals are not changing between the moments
when the user zeros the display and when the measurement is made.

Newport 1936-R series Specifications

General

Brand	Newport
Model	1936-R series
Category	Measuring Instruments
Language	English