User`s guide

Performance Tests Performance Tests

50 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Press the [Menu] softkey and move to <Number of digits>, press

Enter, move to <3>, press Enter and press [Close].

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.

8 Perform the following sub-procedure for the reference Power Meter,

81634B:

a Press [Menu], move to <Range mode>, move to <Manual>, and

press Enter.

b Move to <Range>, press Enter, move to <-50 dBm>, press Enter, and

press [Close].

9 Perform the following sub-procedure for the DUT, 8162xB:

a Press [Menu], move to <Range mode>, move to <Manual>, and

press Enter.

b Move to <Range>, press Enter, move to <10 dBm>(40 dBm for

81628B), and press Enter.

c Zero both Power Meters. Move to <Zero all> and press Enter.

10 Enable both attenuators.

11 Adjust the attenuation of Atty2 in order to achieve -47.2 dBm on the

reference Power Meter.

+10 dBm Range (equivalent to +40 dBm range for 81628B)

1 Applies to the 81626B only:

Always include at least three digits after the decimal point when you note

a power reading.

NOTE

For 81628B:

Before starting the measurement move to the DUT channel and enter a

calibration factor of 31 dB. This simulates the disconnected integrating

sphere. If the power at the DUT overflows when switching to the lower

range decrease the calibration factor (e.g. to 30 dB) and start the linearity

test again.

NOTE