HP 37717C, Calibration Manual, Page: 335 / 399

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Performance Tests
ETSI/ANSI Transmitter Output Level and Waveshape (Option 110)
4. Select CHAN on the oscilloscope and set to 50 ohms input impedance, DC
coupled.
5. Select CHANNEL 1 on the oscilloscope and select PROBE 2.45 (attenuation
level to compensate for the 75/50 ohm converter).
6. 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 DS3 45 Mb ANSI T1.102 softkey.
f. STORE to M1 + M2 softkey.
g. STORE softkey.
7. 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.
N OT E 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.
DSX-3 Negative Pulse
1. Select CHAN on the oscilloscope and set OFFSET to -270 mV.
2. Select TRIG on the oscilloscope and set to PATTERN H X X X.
3. Select TIMEBASE on the Oscilloscope and set DELAY to -186 nS. Adjust the
delay manually until the negative pulse is centred on the oscilloscope display.
4. If using the HP 54503A oscilloscope, use the following key sequence to select
and store the correct Telecom Mask.
a. WFORM SAVE key.
b. MASK DS3 45 Mb ANSI T1.102 softkey.
c. STORE to M1 + M2.
e. STORE INVERSE.
5. Compare the isolated negative pulse from the HP 37717C with the limits in the
selected Telecom Mask.