HP 8642A Operating Manual page 279

Model 8642A/B
Performance Tests
PERFORMANCE TESTS
PROCEDURE: 1. Connect the instruments as shown in Figure 4-13.
Set up the oscilloscope as follows:
Channel A scale: l.OOvolt/div
Channel B scale: 10. Ox 10
A
- 3 volt/div
Channel A coupling: DC
Channel B coupling: DC
Sweep Time: 1.0 usec sec/div
Set up the function generator as follows:
Function: Pulse
Frequency: 50 kHz
Amplitude: 1 volt (peak)
Amplitude Offset: 1 volt
Pulse Width: 6 usec
Set up the spectrum analyzer as follows:
Center Frequency: 1000 MHz
Resolution BW: 3 MHz
Frequency Span: 0 Hz
Reference Level: +20 dBm
Vertical Scale: Linear
2. Rise/Fall Time
Set the HP 8642 RF frequency to 1000 MHz, amplitude to +1 3 dBm
and turn on external dc pulse modulation. The spectrum analyzer
trace should cover the display form the bottm of the CRT nearly to
the top. On the Oscilloscope, verify that the recovered modulation
pulse on channel B rises from 10% of the final value to 90% of the
final value within 3.5 usec. Record the reading below.
Rise Time:
4-47