Operation
EPM2000/EPM2000e Reference Guide
24
RESPONSIVITY (PYROELECTRIC)
The Pyroelectric Responsivity Value is the conversion factor, converting probe voltage to energy in
Joules. The simple equation describing this is: Energy in Joules = Probe Voltage/Responsivity. The
probe responsivity is typically printed on the probe label. Note that if the probe responsivity is
expressed in some fractional unit (for example, Volts/millijoule), then the stated responsivity must be
multiplied accordingly.
Each channel of the EPM2000 can use an independent Responsivity value. Use the channel’s specific
key when programming.
To change the pyroelectric responsivity, press
. The current pyroelectric responsivity will be
displayed. For example, if the current responsivity is 2200 V/J, then the EPM2000 LCD will read
. Use the and keys to change the exponent and exponent sign.
Use the Numeric Entry Keys to change the decimal value. When complete, press
to complete the
action.
Compensate for optical attenuation by adjusting the responsivity accordingly. For example, if a
detector’s responsivity is 1.53 and the beam passes through a 50% optical attenuator before striking
the probe, set the responsivity to 0.765 or 7.65 x 10
-1
(1.53 x 0.5).
RESPONSIVITY (THERMOPILE)
The Thermopile Responsivity, like the pyroelectric responsivity, is a conversion factor, but to Watts
instead of Joules. For most probes, each channel of the EPM2000 will automatically read the
thermopile responsivity from the probe EEPROM, but sometimes the thermopile responsivity must be
changed manually.
As with Pyroelectric Responsivity, each channel’s Thermopile Responsivity can be manually
programmed. Because an EPM2000 reads any attached PowerMax probe upon powerup, changing
the Thermopile Responsivity is only good until the EPM2000 is turned off or a new probe is attached.
To change the thermopile responsivity, press
. The current thermopile responsivity will appear
on the LCD. As with the pyroelectric responsivity, press
or to change the exponent and
exponent sign. Change the decimal part using the Numeric Entry Keys. Finish by pressing
.
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