Tektronix CSA7404B, Service Manual

Page: 48 / 348

Specifications
1- 24
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
Table 1- 8: O/E converter (CSA7000B Series only) (Cont.)
Characteristic
1
Description
Optical return loss, typical With 50 m or 62.5 m core multimode fiber (CPC6):
>14 dB for 780 nm
±
20 nm
>14 dB for 850 nm
±
20 nm
With 9 m core singlemode fiber (SMF-28):
>28 dB for 1310 nm
±
20 nm
>28 dB for 1550 nm
±
20 nm
The return loss includes optical reflection contributions from the device under
test’s SC-SPC connector interface with the user’s PC style connector as well as
all other optical reflections from that interface up to and including the device
under test’s final photo diode termination.
Peak-to-peak aberrations in
response to falling edge, typical 11% peak-to-peak total aberration (system including O/E-to-CH1 input adapter,
and instrument)
Maximum falling edge 10% to 2% settling time
(ORR disabled), typical The step response to a fast optical square OFF edge reaches toc within 2% of
the final 0% level within 2 ns after the 10% transition point.
Smallest average power for mask test (sensitivity),
typical 1310 nm and 1550 nm:
40
W peak-to-peak. 20 W (--17 dBm) average power assuming 50% average
duty cycle
780 nm and 850 nm:
80
W peak-to-peak. 40 W (--14 dBm) average power assuming 50% average
duty cycle
Assumes the scale factor is set to minimum W/div settings and signal is at
least 2 divisions peak-to-peak
Optical scale factor range 10 W per division to 500 W per division
Optical reference receiver typically available from the following scale factors:
1310 nm and 1550 nm:
13.5 W per division to 66 W per division
850 nm:
25 W per division to 125 W per division
780 nm:
28 W per division to 142 W per division
1
All specifications are with the O/E electrical out-to-CH1 input adapter installed.