HP 3468A - Page 85

dBm
MEASUREMENTS
The
dBm
Program
is
used
to
calculate
a
power
ratio
using
a
S02
impedance
as
the
reference. The dBm equation is:
dBm
=
10*LOGI(X2/R)/1mw]
where
X
is
the
measured
value,
R
is
the
impedance
reference
(500’s)
and
1mw
is
the OdBm reference.
Lines
30
1 dBm MEASUREMENT
| =H - QERSION
GUTPUT S@1 ;"F2RANGZ1TIi" 40-50
ENTER $01 i B
PH1O#LOGCR275a- 91)
OISP P
GOTO 48
END 50
60-70
81
Description
The
REMOTE
9
message
sets
the
interface
at
select
code
9
to
the
remote
mode.
It
also
ensures
that
each
device
in
the
loop
has
been
autoaddressed
by
the
controller.
Line
40
sets
the
3468A
to
the
ac
volts
mode
(F2),
autorange
(RA),
4%
digit
display
mode
(N4),
Autozero
on
(A1),
and
internal
trigger
(T1).
Line
50
performs
the
voltage
to
dBm
con-
version.
The
dBm
value
is
displayed
by
Line
60.
Line
70
causes
program
execution
to
return
for
another
reading.