HP 8444A - Page 21

Model 8444 A
5.
OPERATING PROCEDURE
WITH AN 8555A
.Check that the 115/230 switeh is set to correspond
with the available line voltage. Refer to Figure 3-2,
steps 4 through 8, for switch and fuse information.
.Apply power to Tracking Generator and Spectrum
Analyzer.
. Turn Spectrum Analyzer INTENSITY control fully
CCW.
.AHow instruments to warm up for at least 30
minutes.
Perform Spectrum. Analyzer Operational Adjust-
ments (30 MHz Calibration). Refer to 8555A RE
Section Operating and Service Manual.
. Set Spectrum Analyzer LOG/LINEAR control to
LOG, LOG REF LEVEL to 0 dBm, and BAND-
WIDTH to 300 kHz.
. Make the following interconnections between Track-
ing Generator and Spectrum Analyzer:
a. FIRST LO INPUT to FIRST LO OUTPUT.
b. THIRD LO INPUT to THIRD LO OUTPUT (rear
panel connections).
ce. RF OUTPUT to INPUT.
d. SCAN OUTPUT to SCAN IN/OUT.
8. Check that the Spectrum Analyzer controls are set as
follows!
INTENSITY 45033 12 o’clock (approx.)
BAND Sinai n=1— (2.05 GHz IF)
FREQUENCY ans aca sede ee yale he 30 MHz
BANDWIDTH se % 4.5 oros ei 300 kHz
SCAN WIDTH PER DIVISION ...... a 100 kHz
INPUT ATTENUATION esse re: 20 dB
TUNING STABILIZER 2.22 tare Dha eek st ON
SIGNAL IDENTIFIER 045 804434 wee eek ars OFF
BASE LINE CLIPPER ca tec. od ake es CCW
SCAN TIME PER DIVISION .... 10 MILLISECONDS
Operation
POG LINEAR: reia pd. wala carts LOG
LOG REF LEVEL sas ara KAG 0 dBm
LOG REF LEVEL Vernier ...0 600000 iaa 0
VIDEO FILTER vaticano dia OFF
SCAN MODE yl nte De de yeaa ise INT
SCAN TRIGGER unless boris LINE or AUTO
9,Set Tracking Generator LEVEL control to 0 dBm
and adjust TRACK ADJ for maximum signal ampli-
tude indication on CRT display.
10. Adjust Spectrum Analyzer Vernier control or Track-
ing Generator LEVEL control to position signal on
CRT LOG REF level graticule line. (System cali-
brated at 30 MHz with an amplitude accuracy of
20.5 dB.)
11, Set Spectrum Analyzer to scan desired frequency
range. (FREQUENCY control adjusted to center of
frequency of interest, SCAN WIDTH set for desired
coverage.)
12. Insert device to be tested between Tracking Genera-
tor RF OUTPUT and Spectrum Analyzer RF
INPUT.
13. Rotate Tracking Generator MANUAL SCAN control
fully counterclockwise.
14. Set Spectrum Analyzer SCAN MODE switch to
EXT.
15. Rotate Tracking Generator MANUAL SCAN control
clockwise to tune system through selected frequency
range, l
16. For automatic scanning, set SCAN MODE switch to
INT and SCAN TIME PER DIVISION to desired
scan time.
Figure 3-4. Tracking Generator Operation with 8555A Spectrum Analyzer (2 of 2)
3-7