HP 5528A User Manual

Model 55 28A
Append ix A : Princi pl es of Operation
A-2
•
HP-IB interface cir c uit s,
•
a Data Bu s system,
•
Keyboard-Display,
•
Pro cesso r, and
•
Power S uppli es.
An extensive s elf -test feature built into the Mea s ur ement Display unit runs during the La ser Head
warmup period, giving a high degree of c onfiden ce that the equipment is operating properly .
The Measurement
Display unit 's Proce ss or al so controls the timing and sequence of operations
in the
sy stem. This include s transfer and routing of dilta, calculations, and the display timing and
c
ontrol func tion s.
Th e Mea s urement Display unit 's fronl-pan el di splay is an all- numeri c LED ( light -Emitting Diod e)
readout c
on sisting of nin e digit s plu s it sign indi cator.
The
HP-IB (interface) cf rcuits allow the Mea surement Displ ay unit to be interfaced with an
external c ontroller such as a calculator or computer. Data c an be sent to or from the
Mea s urement Di splay unit v ia the imerface bus. Th e HP-IB also allows all front -panel keyboard
functio ns to be remotely programmed. A " TALK -ONLY" mode a ll ow s tr an sfer of data to a
recording device such as a digital pl otter without using a c ontroller .
5518A Laser Head
The La s er Head c ontain s -
• A thermally-tuned l
ase r tube ,-
• Control c ir cuit s, -
• A Reference Re ceiver, -
• A M
eas ur eme nt Re ceiver, and a -
• High- voltage Power Suppl y.
The La ser Head al so c ontain s a special Optic used for Straightn es s measurement s. This Opt ic is
mo ved int o the La ser beam when the turre t ring is switched to "STRAIGHT" . For mor e
informati on about this Opti c, see the "STRAI GHTNESS MEASUREMENT" information, below.
10751 Air Sen so r
The Air Sens or' s air pr ess ure output is an analog vo ltage that is controlled by the si ze of a small
anero id barometer contained in the sens or . Th e Measurement Display unh converts this analog
voltage
to a dig ilill value Ihat it us es in its Velocity- of -Light (" V.O .L " ) calculation.
Th e Air Sensor 's air te mperature output is an analog voltage that is c ontrolled by a temperature-
sen sitive el ement in the sen so r. The Mea surement Display unit converts this analog voltage to a
digital voltage that it uses in its V.O .L calculation.

HP 5528A Specifications

General

Brand	HP
Model	5528A
Category	Measuring Instruments
Language	English