HP 8920A, User Manual

Page: 46 / 658

46
S:\HP892XX\USRGUIDE\manual\getstart.fb
Chapter 1, Get Started
How do I Verify that the Test Set is Operating Properly?
How do I Verify that the Test Set is Operating Properly?
If your Test Set powers-up and displays the RX TEST screen, but you suspect an
instrument problem, use the Instrument Quick Check to verify operation of the
basic instrument functions.
If no failure is indicated by this test, but you still suspect a problem, refer to the
“Performance Tests” information in the Assembly Level Repair Manual.
Instrument Quick Check
1. Set up the quick check:
a. Connect a cable between the DUPLEX OUT and ANT IN ports.
b. Turn instrument power on (if it is not already on).
c. Press PRESET.
d. Press DUPLEX to access the DUPLEX TEST screen.
e. Set the
Tune Mode
field to
Manual
.
f. Set the
Tune Freq
field to
825
MHz.
g. Set the
Input Port
field to
Ant
.
h. Set the
RF Gen Freq
field to
825
MHz.
i. Set the
Amplitude
field to
-10
dBm.
j. Set the
Output Port
field to
Dupl
.
k. Verify that
AFGen1 Freq
is set to
1.0000
kHz, and that
AFGen1 To
is set to
FM
and
3.00
kHz.
l. Set the
AF Anl In
field to
FM Demod
.
m. Set the
Filter 1
field to
300Hz HPF
.
n. Set the
Filter 2
field to
3kHz LPF
.
o. Verify that
De-Emphasis
is
Off
.
p. Set the
Detector
field to
Pk+-/2
.
q. Turn the VOLUME knob clockwise until you hear a tone (1 kHz default for
AFGen1 Freq).
2. Check the following readings:
❒
SINAD should be >35 dB.
❒
FM Deviation should be about 3.0 kHz.
3 Access the OSCILLOSCOPE screen using the
To Screen
menu. With the default
Vert/div
setting of
2 kHz
and a default
Time/div
setting of
200
µ
s
, you should
see two complete sinewaves across the screen.
4 Access the SPECTRUM ANALYZER
1
using the
To Screen
menu. You should see
an 850 MHz FM carrier.
1. Optional on some Test Set models.