HP 8642A - Page 297

Model 8642A/B
PROCEDURE:
1.
Performance Tests
PERFORMANCE TESTS
Connect the instruments as shown in Figure 4-13.
Set up the oscilloscope as follows:
Channel A scale:
Channel B scale:
Channel A coupling:
Channel B coupling:
Sweep Time:
Set
up the function generator as follows:
Function:
Frequency:
Amplitude:
Amplitude Offset:
Pulse Width:
Set
up the spectrum analyzer as follows:
Center Frequency:
Resolution
BW:
Frequency Span:
Reference Level:
Vertical Scale:
1.00
voltldiv
10.OxIO"'-3 volt/div
DC
DC
1.0 usec
sec/div
Pulse
50 kHz
1 volt (peak)
I volt
6 usec
1000 MHz
3 MHz
a Hz
+20 dBm
Linear
2. Rise/Fall Time
Set
the HP 8642 RF frequency to 1000 MHz, amplitude to +13 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