Atec Agilent-81618A - Manual (Page 46)

Performance Tests Performance Tests
46
Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition
Perform the test until the power reading of the DUT shows:
for 81622B: -27.x dBm
for 81623B: -47.x dBm
for 81624B: -57.x dBm
for 81626B: -37.x dBm
for 81627B: -57.x dBm
for 81628B: -57.x dBm (without sphere)
1 Make sure that cable connector, detectors and adapters are clean.
2 Make sure that you perform this test in a temperature-controlled
environment with temperature fluctuations less than ±1°C.
3 Setup the equipment as shown in Figure 11. Disable both
attenuators and enable the laser source, where the source
wavelength is chosen to 1550 nm. If you are using the 81657A, move
to the wavelength parameter, [
λ], press Enter, select the longer
wavelength source (1550 nm nominally), and press Enter.
4 Set the wavelength of both attenuators to the same wavelength as
the laser source.
5 Perform the following sub-procedure for both Power Meters:
a Move to the Power Meter channel.
b Move to the wavelength parameter, [
λ], press Enter, enter the
wavelength of the laser source, and press Enter.
c Move to the calibration parameter, [CAL], press Enter, set the
calibration parameter to zero, and press Enter.
d Move to the averaging time parameter, [AvgTime], press Enter,
move to <100 ms>, and press Enter.
e Move to the power parameter, [P], press [Pwr unit], move to
<dBm>, and press Enter.
f Press the [Menu] softkey and move to <Number of digits>, press
Enter, move to <3>, press Enter and press [Close].
N O T E Always include at least three digits after the decimal point when
you note a power reading.
6 Initialize the two attenuators as follows:
a Set the attenuation of the 8156A #221 with Monitor Output
(referred to as Atty1) to 0 dB.
b Set the attenuation of the other 8156A (referred to as Atty2) to
35 dB.
7 Wait at least 15 minutes until the laser source has stabilized.