Tektronix TDS500C Manuale Utente Scaricare il pdf (Pagina 110)

Performance Tests

1–94

TDS 500C, TDS 600B & TDS 700C Performance Verification and Specifications

Figure 1–45: Optical impulse response for OC–12 SONET Reference Receiver

NOTE. In Figure 1–45, the left cursor is at the DC frequency. The right cursor is

at the OC-12 data rate of 622 MHz "4 MHz. Also, note that the reference

receiver, RR, designation is beside the 20 W vertical scale factor.

f. Next, move the cursor currently positioned at the beginning of the record

until the cursor is just right of the DC spike in the response (see

Figure 1–46). The unsigned D dB readout should be at or between the

upper and lower limits shown in Table 1–10 (note that the entries in the

table are signed numbers, but the D dB readout is not) for the mask that

is turned on.

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Tektronix TDS500C Manuale Utente Pagina 110