E4 (139.264Mb/S) Frequency Accuracy; Ds1 (1.544Mb/S) Frequency Accuracy - HP 37718A Installation And Verification Manual

Performance Tests
PDH/DSn Internal Transmitter Clock Accuracy & Offset
24 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 17182205Hz and 17182359Hz.

E4 (139.264Mb/s) Frequency Accuracy

25 Select SIGNAL [140Mb/s] PATTERN [ALL 1's] on the
display.
26 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69631686.5Hz and 69632318.5Hz.
27 Select FREQUENCY OFFSET [+15PPM].
28 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69632731Hz and 69633358Hz.
29 Select FREQUENCY OFFSET [-15PPM].
30 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69630642Hz and 69631269Hz.

DS1 (1.544Mb/s) Frequency Accuracy

31 Connect the CLOCK OUT port of the PDH/DSn module to the
Frequency Counter.
32 Select SIGNAL [DS1 1.5Mb/s] on the
33 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 1543993Hz and 1544007Hz.
34 Select FREQUENCY OFFSET [+32PPM]
35 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 1544042Hz and 1544056Hz.
36 Select FREQUENCY OFFSET [-32PPM]
37 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 1543944Hz and 1543958Hz.
TRANSMIT
display.
TRANSMIT
3-11