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Performance Test Procedure
WARNING
Agilent 81570A, 71A, 76A, 77A & 78A Variable Optical Attenuators, Eigth Edition
Relative Power Meter Uncertainty Test
This test applies to the Agilent 81576A and 81577A Attenuators with
power control.
Carry out the following Power Meter Uncertainty Test at 1550 nm or
another spwcified wavelength with single mode fibers using the
equipment listed in
contact versions of the attenuator use patchcords with appropriate
connectors and suitable connector interfaces.
Do not turn the laser off during the measurement! Clean all connectors
carefully before you start with the measurement.
Turn the instruments on and allow the devices to warm up (20 to 30
1
min.).
Make sure that you perform this test in an environment with
2
temperature fluctuations less than
Make sure that all your connectors are clean and undamaged.
3
Connect the equipment as shown below in
4
Figure 16
Relative Power Meter uncertainty Setup for SM attenuators
Set both attenuators to the wavelength of the source and disable them.
5
Set the attenuation [α] of 81570A reference attenuator to 55dB.
6
Set the attenuation [α] of the DUT attenuator to 0 dB.
7
Set the averaging time of the DUT attenuator power meter to 1 s.
8
Zero the reference and the attenuator power meter.
9
Enable the laser source and wait for it to stabalize (> 30 seconds).
10
Enable the attenuators.
11
Set the reference power meter to the wavelength of the source, set the
12
averaging time to 1 s. and display [dB]. Press [Display to Reference.
Set the range mode of the reference power meter to Manual.
13
On the DUT attenuator edit P Offset until the parameter P
14
dBm.
Lower P
15
SET
Note the reference power meter reading in the Test record.
16
Repeat step 14 and step 15 until the reference attenuator shows an
17
attenuation of 0 dB.
Perform step 14 and step 15 upward until the reference attenuator
18
shows 55 dB.
Table 4
on page 48. To adapt for the straight or angled
and the attenuation of the reference attenuator by 5 dB.
Performance Tests
°
C.
1
±
Figure
16.
SET
equals 0
63
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