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How much hysteresis does the power control loop of the 81566A/67A show?
There are two threshold levels (if power control is active).

FAQ 2011-07-05

Is the 8156xA suitable for Cable TV applications?
The angled connector versions 81561A and 81567A avoid irritating interference effects.

FAQ 2011-07-05

Why should I use an optical head for optical power measurements?
Use heads for bare fiber, open beam, highly accurate absolute power or high power measurements.

FAQ 2011-07-05

Can I use both PC and APC connectors with the optical heads?
Yes, you can use both straight (PC) and angled (APC) fiber with the Keysight Technologies optical heads.

FAQ 2011-07-05

Is the power control loop of the 81566A/67A also working for signal packets?
Yes, the averaging time of the 81566A/67A has to be adjusted to a time significantly longer than ...

FAQ 2011-07-05

What accessories should I order with the 8162x optical heads?
The heads will not be able to operate as standalone instruments. The following accessories are needed ...

FAQ 2011-07-05

I just received my new 816x module and the mainframe does not recognize the module. What should I do?
The mainframe firmware must be at least the same revision number as the module.

FAQ 2011-07-05

Should I use a Germanium (Ge) or a Indium Gallium Arsenide (InGaAs) optical head?
An important difference between Ge and InGaAs is the shape of the spectral responsivity curves.

FAQ 2011-07-05

What is the noise floor of the power sensor in the 81566A/67A?
The noise floor of the power sensor in the 81566A/67A is 20 pW.

FAQ 2011-07-05

What kind of power sensor is used in the 81566A/67A?
The 81566A/67A uses an InGaAs photodiode, similar to Keysight's 81632A power sensor module.

FAQ 2011-07-05

Can I use the newer 816xx modules in the older 8153A mainframe?
The new 816xx modules will NOT operate in the older 8153A mainframe.

FAQ 2011-07-05

What is the calibration cycle for the 8169A polarization controller?
The recommended calibration cycle for the 8169A is 12 months.

FAQ 2011-07-05

What is the difference between the (for pay) photonic library and the (free) PNP drivers?
See long answer.

FAQ 2011-07-05

What is the calibration cycle for the 8161x Optical Return Loss Module?
The 8161X Optical Return Loss Modules have a 24 month calibration cycle.

FAQ 2011-07-05

Does the parameters 'averaging time' and 'speed' influence the power control loop of the 81566A/67A?
The user selected averaging time is effective for all internal power measurements...

FAQ 2011-07-05

Is there an electrical extender cable for the 815xx series optical heads?
An electrical extender cable was available. However, we do no longer manufacture it.

FAQ 2011-07-05

I am going through several patch cables before I connect to my device. Where do I establish my reference?
If you are measuring return loss through several patch cables there are three calibrations which are ...

FAQ 2011-07-05

Why can't I install the license key from my PFL CD-ROM?
If you have PFL version 1.0.3 the installation process is described on the CD-ROM (PFL README.pdf).

FAQ 2011-07-05

When I calibrate power/ return loss / source modules, do I send the mainframe as well?
No, it is not required to send in a mainframe to calibrate individual modules.

FAQ 2011-07-05

How is the 8169A different from the 11896A polarization controller?
The 8169A Provides polarization synthesis relative to a built-in linear polarizer.

FAQ 2011-07-05

What is the difference between the 8162xA and the 8162xB optical heads?
The main difference is the 8162xB models (except the 81625B) offer an analog output, the 8162xA's do not.

FAQ 2011-07-05

What happens if the power unit is changed from dBm to Watt or vice versa?
All dependent parameters are automatically converted accordingly so all features remain fully functional.

FAQ 2011-07-05

What is the calibration cycle for the DFB Laser sources?
The calibration cycle for the 8166xA DFB laser sources is 24 months.

FAQ 2011-07-05

Can I use the 816xx series modules in any of the 816x mainframes?
The compact modules will operate in any of the 816X mainframes. However, the large slot tunable ...

FAQ 2011-07-05

How do I make high power measurements with an optical head?
The + 27 dBm optical heads are convenient for high-power measurements.

FAQ 2011-07-05

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