Newport FPM-8220, User Manual

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April 2018 57 FPM-8220
REF?
Common
Device Dependent
Front Panel
Action Requests the reference level value.
Response GPIB-standard nrf value, in the units currently defined. See
MODE
.
Notes Same function as pressing dBm/W and REF together on the front panel.
Examples
REF? - Response 0 means the reference level is 0 dBm.
Ref? - Response -20 means the reference level is -20 dBm (10
μ W).
Ref? - Response 2.795E-006 means the reference level is 2.795 μ W.
RESP? Common
Device Dependent
Front Panel
Action Requests the calibrated detector responsivity for the currently selected wavelength.
Response
GPIB standard <nrf value>, in units: mA / mW
Notes The information should correspond with that on your latest ILX Lightwave calibration certificate for this
meter. If not, contact ILX Lightwave Customer Service to resolve the discrepancy.
This information can be useful for understanding the characteristics of your FPM-8220 meter. Notice
for example that detector current is much less at shorter wavelengths.
For more information, see the discussion of the calibration certificate at the end of Chapter Two.
Examples RESP? - Response 1.193E-2 means the detector produces 0.01193 mA/mW at the currently set
wavelength.
TERM <nrf value> Common
Device Dependent
Front Panel
Action Defines the message terminator.
Paramters 0 =
<CR><NL><^END>
1 =
<CR><NL>
2 =
<CR><^END>
3 =
<CR>
4 =
<NL><^END>
FPM-8220 default and IEEE-488.2 Standard
5 =
<NL>
6 =
<^END>
Notes All settings other than TERM 4 are technically out of compliance with IEEE-488.2 specifications.
However they are provided for flexible compatibility with various GPIB drivers.
TERM 3 will often cause "bus hang" problems, because IEEE-488.2 compliant instruments ignore the
<CR> as white space, causing them to wait indefinitely for message termination.
Meanings of the acronyms are historical:
CR = Carriage Return (e.g.: a mechanical typewriter)
NL = New Line (e.g.: line-feed on a "line printer")
^END = EOI code (End Or Identify)
Example s Term 4 - Define the message terminator as the IEEE-488.2 standard: <NL><^END>