Agilent Technologies N3970A Spécifications télécharger pdf (Page 25)

■ CALIBRATION & MAINTENANCE

Enabling / disabling ‘shift’ keypad & re-booting the

microprocessor: See section on ‘getting started &

turning on.

Calibration

Calibration can be readily performed without opening the

instrument. Calibration is performed by setting up a singlemode

laser source at a stable but non-critical power level between -10

and -30 dBm, and adjusting the meter reading to the same value

as that shown by a reference meter.

A l t e rn a t i v e l y, known calibration constants can be

re-entered directly without using other equipment. This is useful

in case old calibration constants are to be put back, or the

instrument memory has been corrupted.

R e q u i red are laser light sources with accurate, calibrated

wavelengths and good power stability, a power meter with

appropriate calibrated wavelengths, singlemode test leads, an

anti-tamper label, and a 0.1” programming jumper. Check the

calibration certificates on your reference equipment, to ensure

current validity.

To enable calibration mode, open the battery compartment, hold

back the battery spring, remove the anti-tamper label, and insert

a 0.1” pitch programming shunt. Manipulation of the shunt is

easier with needle nose pliers. The meter will display ‘CAL’

Before commencing calibration:

■ Clean all connectors and the meter input ports very carefully

■ Ensure all devices have been at stable room temperature for

over an hour

■ The source is fully warmed up at the λ to be calibrated,

■ The meter battery is good.

On the meter to be calibrated, record the existing calibration

offsets as follows:

■ Select POWER METER, +/- to set the wavelength, and

MAX/MIN twice to display the offsets. Note them down.

(you can also re-enter or adjust known offsets at this point)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 46 47

Pas de commentaire

Agilent Technologies N3970A Spécifications Page 25