Fluke 871A Operating instructions

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Preliminary Operating Instructions
ev
FLUKE for
FLUKE 67 MODEL 871A € 871AB
“nN ALL SOLID-STATE
DC DIFFERENTIAL VOLTMETER󰾰 چگ
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Serial No. and above

JOHN FLUKE MFG. CO., INC.
P.O.
Box
7428,
Seattle
33,
Washington
Preliminary Operating Instructions
for
®
MODEL
871A
€
871AB
ALL
SOLID-STATE
DC
DIFFERENTIAL
VOLTMETER
February 8, 1965

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871A € 871AB `
TABLE OF CONTENTS
Section Title Page
I SPECIFICATIONS 1-1
II OPERATING INSTRUCTIONS 2-1
2-1. Preliminary Operation for Model 871A . 2-1
2-2. Preliminary Operation for Model 871AB 2-1
2-3. Battery Charging . aoe ARR AA
2-4. Zeroing Instructions . . . 2-2
2-6. Operation as a Differential Voltmeter. 2-2
2-7. Operation as a Conventional Voltmeter . 2-3
2-9. Measurement of Voltage Excursions
aboutlasNonumaleValue. 9 ^ dom tu 2 4
III CALIBRATION 3-1
3-1. General. 3 3-1
3-4, Preliminary Calibration. 3-2
3-5. Null Detector Calibration . . . e e . . 3-2
3-6. 10 Volt Range Calibration . . . . . . . 3-2
3-7. 1 Volt Range Calibration 3-3
3-8. 100 Volt Range Calibration . 3-3
3-9. 1000 Volt Range Calibration . 3-3
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871A & 871AB
SECTION I
SPECIFICATIONS
AS A DIFFERENTIAL VOLTMETER
DC ACCURACY: +(0.03% of input voltage + 10 uv) from 0 to 1100 VDC.
VOLTAGE RANGES: 1, 10, 100, 1000VDC with 10% overvoltage capability
on each range.
NULL RANGES:
Input Range | Null Ranges
1V | 0.001, 0.01, 0.1 V
10 V 0:001, 70-017 2031 LIN,
100 V 0.01 0 L DOMO
1000 V 0.1, 1, 10, 100 V
DC INPUT RESISTANCE: Infinite at null from 0 to 11 VDC; 10 meghoms
above 11 VDC.
METER RESOLUTION: 10 uv maximum.
VOLTAGE DIAL RESOLUTION: 10 uv xaximum.
AS A CONVENTIONAL VOLTMETER
ACCURACY: 3% of range.
RANGE:
Voltage Range DC Input Resistance
1000-0 -1000 10 Meg
100-0-100 1!
10-0-10 y
1-0-1 "n
*0.1-0-0.1 À
*0.01-0-0. 01 ü
*0. 001-0-0. 001 1 Meg
NOTE: 10% overvoltage capability on each range. *These ranges
obtained by using null ranges with all four voltage readout dials set to zero.
1-1

871A & 871AB
GENERAL
ELECTRICAL
DESIGN:
Completely
solid-state.
REGULATION
OF
REFERENCE
SUPPLY:
0.001%
for
a
10%
line
voltage
change.
INPUT
RESISTANCE
OF
NULL
DETECTOR:
10
megohms
on
two
highest
null
ranges
for
all
input
ranges;
1
megohm
on
two
lowest
null
ranges
for
all
input
ranges.
REFERENCE
ELEMENT:
Temperature-compensated
zener
diode.
DC
COMMON
MODE
REJECTION:
130
db.
AC REJECTION:
Frequency
Normal
Mode
Common
Mode
50
cps
60
db
90
db
60
cps
60
db
85
db
84
cps
60
db
70
db
120
cps
10
db
80
db
400 cps
75
db
70
db
5
ke
80
db
60
db
20
kc
85
db
60
db
OPERATING
TEMPERATURE
RANGE:
Within
specifications
from
559F
to
95°F.
Within
0.
05%
from
32°F
to
1229F.
STORAGE
TEMPERATURE
RANGE:
871A
-409F
to
1589F
871AB
-409F
to
140°F
KELVIN-VARLEY
ACCURACY:
+0.01%
of
output
from
1/11
of
full
scale
to
full
scale.
RECORDER
OUTPUT:
Adjustable
from
0
to
+20
mv
minimum
for
full
scale
right
and
left
deflections.
POLARITY:
Selectable
via
front
panel
switch.
SHOCK
AND
VIBRATION:
Meets
requirements
of
MIL
-T
-945A.
INPUT
POWER:
Model
871A
-
115/230
VAC
+10%,
50
-
440
cps;
Model
871AB
-
115/230
VAC
+10%,
50
-
440
cps
and
rechargeable
battery
operation
(minimum
30
hours
operation
on
full
charge).
SIZE:
7"
high
x
8-1/2"
wide
x
11-3/4"
deep.
WEIGHT:
Model
871A
-approximately
12
lbs.
=
Model
871AB
-approximately
14
lbs.
1-2

871A & 871AB
SECTION II
OPERATING INSTRUCTIONS
2-1, PRELIMINARY OPERATION FOR MODEL 871A
a. Connect power plug to a 115 volt AC power source. If instrument
has been wired for 230 volt operation, connect to 230 volts AC.
NOTE: The round pin on polarized plug connects
instrument case to power system ground. Use
three-to-two pin adapter supplied with instrument
when connecting to a two-contact receptacle. For
personnel safety, connect short green lead to a
good earth ground.
b. Set switches on 871A voltmeter as follows:
RANGE 1000
NULL TVM (transistorized voltmeter)
polarity + (positive)
all voltage 0 (zero)
readout dials
2-2. PRELIMINARY OPERATION FOR MODEL 871AB
a. For line operation, connect power plug to a 115 volt AC power
source. If instrument has been wired for 230 volt operation, connect
to 230 volts AC.
NOTE: The round pin on polarized three-prong
plug connects instrument case to power system
ground. Use three-to-two pin adapter supplied
with instrument when connecting to a two -contact
receptacle. For personnel safety, connect short
green lead to a good earth ground.
b. For line operation, set POWER switch to LINE OPR.
c. For battery operation, set POWER switch to BAT CHECK and wait
for 10 seconds. Meter needle should indicate in BATTERY OK region.
If not, charge batteries as outlined in paragraph 2-3. If batteries are
charged, set POWER switch to BAT OPR-LINE ISOL.
2-1

871A & 871AB
d.
Set
controls
on
voltmeter
as
follows:
RANGE 1000
NULL
TVM
(transistorized
voltmeter)
polarity
+
(positive)
all voltage 0 (zero)
readout dials
2-3. BATTERY CHARGING
a.
Connect
power
plug
to
a
115
volt
AC
power
outlet.
If
instrument
has
been
wired
for
230
operation,
connect
to
230
volts
AC.
b.
Set
POWER
switch
to
BAT
CHG-LINE
OPR.
After
16
hours,
batteries
will
be
fully
charged
and
capable
of
operating
the
instrument
for
at
least
30
hours.
While
the
batteries
are
being
charged,
the
instrument
may
be
operated
the
same
as
for
line
operation.
CAUTION:
Since
overcharging
decreases
battery
life,
it
is
recommended
that
the
batteries
be
charged
for
less
than
48
hours
and
never
more
than
1
week.
When
used
properly,
the
batteries
will
give
more
than
200
charge-discharge
cycles
of
operation.
2-4.
ZEROING
INSTRUCTIONS
2-5.
From
time
to
time,
it
may
be
necessary
to
adjust
the
internal
meter
zero
control.
This
will
normally
be
done
at
somewhat
more
frequent
intervals
than
complete
instrument
calibration.
Proceed
as
follows:
a.
Perform
preliminary
operation
as
stated
in
paragraph
2-1
or
2-2.
b.
Mechanically
zero
the
meter
with
the
adjustment
screw
on
the
front
of
the
meter
case.
If
the
instrument
top-back
cover
is
on,
it
must
be
shut
off
for
at
least
three
minutes
prior
to
this
adjustment.
If
the
top-back
cover
is
off,
another
method
would
be
to
short
out
the
internal
meter
terminals
prior
to
zeroing.
c.
Set
POWER
switch
to
ON
with
871A
or
to
LINE
OPR
with
871AB
and
allow
a
5
minute
warmup
period.
d.
Set
RANGE
switch
to
1,
voltage
readout
dials
to
zero,
and
NULL
switch
to
0.
001.
e.
Short
INPUT
post
to
COMMON
post
and
remove
right
side
panel.
f.
Adjust
electronic
zero
control
R227
until
meter
needle
indicates
zero
when
side
panel
is
replaced.
g.
Remove
short
between
INPUT
and
COMMON
post.
2-6.
OPERATION
AS
A
DIFFERENTIAL
VOLTMETER
a.
Perform
preliminary
operation
as
stated
in
paragraph
2-1
or
2-2.
b.
Connect
unknown
voltage
between
INPUT
and
COMMON
posts.
If
one
side
is
grounded,
always
connect
it
to
the
COMMON
post.
2-2