HP 3455A - Page 23

Model
3455A Section III
SECTION
III
OPERATING
INSTRUCTIONS
3-1.
INTROOUCTION.
3-2.
This section contains information and instructions
necessary for operation of the Model 345SA
Digital
Voltmeter.
Included
is
a
description of operation
characteristics, a description of the
operating controls
and indicators, and
functional checks to
be
performed
by the operator.
3-3. OPERATING CHARACTERISTICS.
3-4.
Tara Oi) and Wana-Up.
3-5.
Before connecting ac
power
to
the 34S5A. make
certain the rear panel line
selector switches are set to
correspond to the
voltage and frequency of the
available
power
line and that the
proper fuse is installed for the
voltage selected. For rated measurement accuracy, the
345SA should be
allowed
to
warm
up
for at least one
hour.
3-B.
Salt Tast
Oparation.
logic of the
instrument. When all these measurements
and calculations are completed, the 34S5A
will
display
+ . 8. 8 . 8 . 8 . 8 . 8 . 8. and the self-test
operation will start
again.
In order to bring the instrument out of this mode,
any other function button must be pressed.
3-8.
In the
event
of a cal constant failure, the Self-Test
operation will stop and the failing cal constant’s number
will be displayed (an integer number from 13 to 0).
If
the dummy calculation fails, a non
integer number is
displayed (e.g.,
9.998
or
10.002 etc.).
3-9.
The Self-Test
function can
be
remotely programm-
ed, as described in the
programming portion of this sec-
tion. The
3455A will output a 10 upon a successful com-
pletion of the test and if
addressed
to
“talk.” If the
dummy
calculation
fails,
the answer of the dummy
calculation will be the output (9.998 or 10.002 etc.). If
any auto-cal constants fail, the 3455A
will
not output
any readings,
(times
out).
NOTE
3-7.
The internal test function of the 3455A
verifies
the
The
self
test feature
does not test operation
operation of the dc analog circuitry, inguard
and
of
the ohms or ac
sections nor
the
measure-
outguard logic circuitry,
and
the
front panel indicators ment
accuracy
of
the 34S5A.
and display. The primary test of the dc analog circuitry
is the measurement of
various Auto-Cal
constants.
A
3-10.
DC Veltiga
MNSureawnL
logic check is also
performed, when all the cal constant
measurements are taken. The logic check consists of a
3-11.
The
Model 3453A measures dc
voltage
from 1
dummy cal constant calculation made in the outguard
microvolt
to
KXX) volts in five ranges extending from
.1
Ohms
Signal Terminals
•
supplies drive signal lor
Line Frequency Selection Switch
-
must
be set to
corres-
4*WIRE Ohms
measurements (Paragraph 3-12).
pond to the power liite frequency
(SO
Hz or 60 Hzl.
Input
Terminals
@
Reference Module
®
GUARD switch
-
Internallv connects the
Guard terminal
to the LO
Input terminal
(for front partel operation only,
@
EXTERNALTRIGGER
Input Connector
Paragraph
3-411.
®
HP-IB* Address Selection Switch
•
refer
to
Paragraph
@
GUARD
Terminal
3-63.
REAR PANEL
Cooling Fan
®
Ohms
Signal Terminelt
®
Power Line Voltage Selection Switches
—
refer to Para-
graph 2-8.
®
Input Terminals
(S)
Fuse
-
90 V to 126 V
-
0.6
amp. 198
V to 262
V
-
®
Guard Terminals
0.2S
amp.
Front/Reat INPUT SELECT switch
®
AC
Power
Connector.
HP-IB*
Connector
-
see
Paragraph 2-18 and
3-48.
*HP-I0 IS Hewlett-Packard's
implementation of
IEEE Std.
®
AC or AC/OC Input Selection switch
-
refer to
Paragraph
3-14.
488'197S.
"Standard Digital Interface
for Programmable
Instrumentation
".
Figure
3-1. Front and Rear Panel
Features
(Cont'dl.
3-1