HP 70000 series, User Manual

Page: 116 / 447

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AVERAGE SHRT->C
Range
Displayed
Optical P ower Level
Minus Attenuation
Time
1 0 to 010 dBm 100
minutes
2 010 to 020 dBm 100
minutes
3 020 to 030 dBm 100
minutes
4 030 to 040 dBm 10 minutes
5 040 to 050 dBm 1 minute
When zeroing occurs , an asterisk (*) appears momentarily to the right of the OPT or ELEC
lightwave annotation.
When the softkey function is set to o, the zeroing occurs only when the
NNNNNNNNNNNNNN
ZERO softkey is
pressed.
See the
NNNNNNNNNNNNNN
ZERO softkey description for more information.
Functional Type:
power-meter
Firmkey A ccess:
NNNNNNNNNNNNNNNNN
Amptd
Preset State:
On
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
AVERAGE SHRT->C
(store reference , short) works in conjunction with the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STORE OPEN->C softkey to reduce
mismatches and directivity eects for reection measurements . This provides a more accurate
frequency-response reference trace .
First, set up your measurement system to measure an open reference with Trace A, then
execute
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STORE OPEN->C . Next, set up your measurement system to measure a short reference
with Trace A, then execute
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AVERAGE SHRT->C . Function executed is displayed when the
average of the short and open references is stored. If
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AVERAGE SHRT->C is pressed before
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STORE OPEN->C is executed, not stored, open 1st is displayed on the analyzer display .
Be sure that Trace A contains one complete sweep of measurement data for the open and
short references before executing either
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STORE OPEN->C or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AVERAGE SHRT->C . If the
frequency span or the start and stop frequencies are changed, Trace C no longer contains
a valid reference for the measurement conditions and a new reference must be obtained.
The reference level, reference level position, and vertical log scale may be changed without
aecting the reference .
Softkey Descriptions 4-21