Agilent Technologies DisplayPort Instrukcja Użytkownika Pobierz pdf (Strona 18)

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DisplayPort Test Implementation Group 18 Agilent J-BERT N4903B & 90000A/X/Q Series Sink Draft2

c. Alternate between adjusting PJ 1 on the J-BERT N4903B user interface and pressing the

Single Acquisition Button on the Oscilloscope until the PJ

(d-d)

is calibrated to the following

values.

For RBR

For HBR

For HBR2

Adjust PJ 1 to 100mUI as shown

in the below example

Repeat measurement at least 3

times and average the results.

Figure 12: J-BERT N4903B HBR2 SJ

FIXED

Measurement

Note: In this example, the measured PJ value is 101.2 mUI.

9.3.2 SJ

SWEEP

1. Calibrate SJ

SWEEP

at each frequency with JMD using constant clock at TP3_EQ. Note: To account for

small inaccuracies in measurement of ISI, RJ and SJ

FIXED

compared to the spec, the SJ

SWEEP

should be

adjusted as follows to ensure correct TJ at TP3_EQ:

For HBR: SJ

SWEEP

= SJ

SWEEP

(Table 4-3)*(1 + (323mUI - measured_mUI(ISI + RJ))/168mUI).

For HBR2: SJ

SWEEP

= SJ

SWEEP

(Table 4-4)*(1 + (520mUI - measured_mUI(ISI + RJ + SJ

FIXED

))/100mUI).

Notes:

RJ in this formula is Pk-Pk = 12.0 x RJ(rms).

In the above equations, the denominator of the measurement error correction (168mUI

for HBR and 100mUI for HBR2) is equivalent to the high frequency SJ

SWEEP

value in

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 55 56

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