HP 37717C Calibration Manual page 333

N OTE
Performance Tests
ETSI/ANSI Transmitter Output Level and Waveshape (Option 110)
2. Select the HP 37717C TRANSMIT
page, and set as follows;
3. Select the HP 37717C TRANSMIT
page, and set as follows:
4. Connect the 110 Transmit Module 75 ohms Unbalanced Output to the
Oscilloscope via the 75/50 ohm converter.
5. Select CHAN on the oscilloscope and set to 50 ohms input impedance, DC
coupled.
6. Select CHANNEL 1 on the oscilloscope and select PROBE 2.45 (attenuation
level to compensate for the 75/50 ohm converter).
7. If using the HP 54503A oscilloscope, use the following key sequence to select
and store the correct Telecom Mask.
a. DEFINE MEAS key.
b. COMPARE softkey.
c. TEST ON softkey.
d. WFORM SAVE key.
e. MASK CCITT G703 DS1E 2.0 Mb softkey.
f. STORE to M1 + M2 softkey.
g. STORE softkey.
8. Press the SHIFT key on the oscilloscope (colored blue), then MASK AUTO key,
then 1 key.
The oscilloscope will now automatically display and compare the isolated positive
pulse from the HP 37717C with the limits in the selected Telecom Mask.
It may be necessary to visibly check the waveform fits the mask and manually adjust
amplitude and offset parameters on the oscilloscope to obtain a PASS on the Mask.
9. Measure the peak pulse amplitude at the mid pulse-width using the oscilloscope
and verify that this is between 2.133V and 2.607V.
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