ILX Lightwave FPM-8200, User Manual

Page: 74 / 96

G P I B C O M M A N D R E F E R E N C E
GPIB Command Reference
58
FPM-8200
C H A P T E R
4

Action Requests the current form (radix) of numeric responses.
Responses Dec Decimal numbers. (Default type).
Hex Hexadecimal numbers
Bin Binary numbers
Oct Octal numbers
Note
Use the RADix command to change the radix setting.
Example
Radix?˙Response Hex means numeric responses will be in hexadecimal numbers.
Action
Sets the FPM−8200 photodetector current gain range.
Value range
0 through 7
Notes
The InGaAs photodetector in the FPM−8200 converts optical power into electrical current. The FPM−
8200 is a stable low noise current meter that uses calibration to report photodetector current as
optical power. This current is proportional to optical power, but it also varies with wavelength. For
more information about gain ranges, see Gain Ranges on page 7.
There are eight ranges in the FPM−8200 meter. Each range increases gain by 10x over the previous
range. The maximum photodetector current for each range is as follows
Setting the gain range puts the FPM−8200 into MANUAL range mode.
Examples Range 5
—
Set the photodetector current gain to range 5: 100 nA full scale
RAN 7
—
Set the photodetector current gain to range 7: 1 nA full scale
Action Requests the FPM−8200 photodetector current gain range.
Response Integer number: 0 through 7
Note See the discussion of RANge above for information about gain ranges.
Response is valid whether the FPM−8200 is in MANUAL or AUTO range mode.
Range information is not displayed on the FPM−8200 front panel.
Example Range
—
Response 5 means photodetector current gain is to range 5: 100 nA full scale
RADix?
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
RANge <nrf value>
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
Range Maximum Current Range Maximum Current
0 10 mA 4 1 μA
1 1 mA 5 100 nA
2 100 μA 6 10 nA
3 10 μA 7 1 nA
RANge? C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL