HP 70000 series, User Manual

Page: 407 / 447

harmonic mixing
A technique that extends the frequency range of the spectrum analyzer . A response is
displayed when the input signal satises the following equation:
F
in
= N 2 F
LO
+ F
IF
where
F
in
is frequency of input signal
F
LO
is frequency of the spectrum-analyzer local oscillator
F
IF
is rst IF frequency of the spectrum analyzer
N is the harmonic number of the analyzer local oscillator
Thus , mixing with the harmonics of the local oscillator extends the spectrum-analyzer
frequency range to higher and higher frequencies .
Frequency Ranges and Corresponding Harmonic Numbers
Band/Range Harmonic Number
and Sign of IF
Internal Mixing - HP 71210C 2.9 { 6.2 01
6.0 { 12.7 02
12.5 { 19.9 +3
19.7 { 22.0/26.5 +4
Internal Mixing - HP 71200C 2.9 { 6.2 01
6.0 { 12.8 02
12.6 { 22.0 04
External Mixing - HP 70907A K 18.0 { 26.5 +6
A 26.5 { 40.0 +8
Q 33.0 { 50.0 +10
U 40.0 { 60.0 +10
V 50.0 { 75.0 +14
E 60.0 { 90.0 +16
W 75.0 { 110.0 +18
F 90.0 { 140.0 +24
D 110.0 { 170.0 +30
G 140.0 { 220.0 +36
Y 170.0 { 260.0 +42
J 220.0 { 330.0 +50
HP B ASIC language system
F orms the computer operating system that exercises the program examples in this manual.
HP-IB
Hewlett-P ackard Interface Bus . Supports IEEE-488 and IEC-625, which are worldwide
standards for instrument interfaces . A ccessed at rear-panel of computer and all HP-IB
controlled peripherals (disk drive , printer , plotter , spectrum analyzer , and so on).
Up to 15 devices may be connected to the HP-IB interface at a time . All devices connected
to a particular HP-IB interface are distinguished from each other by an HP-IB address .
Similarly , each HP-IB computer interface has a select code which distinguishes it from other
interfaces in the system. The spectrum analyzer is preset at the factory to have an HP-IB
address of 18. F or convenience , an HP-IB connector with select code 7 is provided on the
Glossary-8