HP ESA-L1500A User's And Calibration Manual page 35

Getting Started
Rear Panel Features
4
Only one optional interface can be installed at a time. Option 1AX or
NOTE
Option A4H must be installed in slot 1 on the rear panel. Option A4H is
shown installed in slot 1 in Figure 6.
5
34
3b EXT TRIG IN (TTL)
edge of an external voltage input that
triggers the spectrum analyzer internal
sweep source.
3c HI SWP OUT (TTL)
spectrum analyzer is sweeping.
(Shown) HP-IB and parallel (Option A4H) are
optional interfaces. HP-IB supports remote instrument
operation and direct printing of screen data. The
parallel port is for printing only.
(Not Shown) RS-232 and parallel (Option 1AX)
are optional interfaces. RS-232 supports remote
instrument operation and direct printing of screen
data. The parallel port is for printing only.
Spectrum Analyzer Inputs/Outputs (Option A4J):
provides a voltage ramp corresponding to the
SWP OUT
sweep of the spectrum analyzer (0 V to 10 V).
indicates when the spectrum analyzer
HI SWP OUT (TTL)
is sweeping.
can be grounded to stop sweeping.
HI SWP IN (TTL)
provides detected video output (before
AUX VIDEO OUT
the analog-to-digital conversion) proportional to
vertical deflection of the trace. Output is from 0 V to 1
V. Amplitude-correction factors are not applied to this
signal. The output signal will be blanked occasionally
during retrace by the automatic alignment routine.
Select a very long sweep time to minimize this, or turn
off the
Auto Align All
manually to maintain calibration.) Refer to the
key description in Chapter 4 for more
Alignments
information on alignment key functions.
is a 50 , 21.4 MHz IF output that is the
AUX IF OUT
down- converted signal of the RF input of the spectrum
analyzer. Amplitude-correction factors are not applied
to this signal. This output is taken after the resolution
bandwidth filters and step gains and before the log
amplifier. The output signal will be blanked
occasionally during retrace by the automatic alignment
routine. Select a very long sweep time to minimize this,
or turn off the
Auto Align All
accepts the positive
indicates when the
function (and use
Align Now All
function (and use
Align Now
Chapter 2