Models 2500 and 2502 User’s Manual Relative, Math, Ratio, and Delta 7-5
V/I
This math function computes the ratio between the selected channel voltage bias source
value and the current measurement:
Reading = V/I
where: V = channel 1 or channel 2 voltage bias
I= channel 1 or channel 2 current
MX + B
This math function multiplies the measured current by an offset factor and adds an offset
value as follows:
Reading = MX + B
where: M = gain (slope) factor
X= channel 1 or channel 2 measured current
B= offset value
Electrical power
This math function calculates power using the bias voltage and measured current values as
follows:
Reading = V × I
where: V = channel 1 or channel 2 voltage
I= channel 1 or channel 2 current
Optical power
Optical power is calculated from the responsivity, measured current, and photodiode dark
current as follows:
Optical power = (I
measured
– I
dark current
)/Responsivity
where: I
measured
= measured photodiode current (amps)
I
dark current
= photodiode dark current (amps)
Responsivity = amps/watt
When you select this math function, you will be prompted to enter responsitivity (R) and
dark current (D) values in amps per watt and amps respectively. The Model 2500 will then
display optical power in watts.
NOTE Zero is not an acceptable value for responsivity, as this value would cause an
infinite result.
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