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
Ume
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TS , componEN
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

871A & 871AB
c. Turn RANGE switch to lowest range that will allow an on-scale
reading and note approximate value of unknown voltage as indicated on
meter scale.
d. If meter reads to left, turn polarity switch to negative position.
Meter needle will deflect to right. This is because polarity of unknown
voltage is negative.
e. Noting the position of decimal point, set four voltage readout dials
to approximate voltage determined in step c. For example, if voltage
is approximately 35 volts, the decimal point will be between the B and
C voltage readout dials. Therefore, set A dial to 3 and B dial to 5.
f. Set NULL switch to successively more sensitive null ranges and
adjust voltage readout dials for zero meter deflection in each null
position. When meter needle indicates to right, magnitude of voltage
under measurement is greater than voltage set on voltage readout dials.
When indication is to the left, voltage is less than that set on readout
dials.
g. Read unknown voltage directly from thefour voltage readout dials.
2-7. OPERATION AS A CONVENTIONAL VOLTMETER
2-8. If it is desired to use the instrument only as a conventional 3%
voltmeter, additional ranges can be made available by converting the
NULL ranges to conventional voltmeter ranges. This is made possible
by setting the voltage readout dials to zero. Proceed as follows:
a. Perform preliminary operation as stated in paragraph 2-1 or 2-2.
b. Consult figure 2-1, and select full scale voltage deflection desired.
If approximate value of voltage to be measured is unknown, select 1000 volt
range initially.
c. Set RANGE switch, NULL switch, and voltage dials as indicated
for the range selected.
d. Connect voltage to be measured between INPUT and COMMON posts.
If one side is grounded, always connect it to the COMMON post.
e. Read voltage from meter scale. Deflection to the right indicates
that unknown DC voltage is of positive polarity.

871A & 871AB
END-SCALE
DEFLECTION
| NULL | VOLTAGE |
| SWITCH | DIALS
1100-0-1100
No effect
110-0-110 No effect
11-0-11 No effect
1.1-0-1.1 No effect
0.11-0-0. 11 All zero
070112020 000 All zero
| 0. 0011-0-0. 0011 |
All zero
Figure 2-1. VTVM RANGES
2-9. MEASUREMENT OF VOLTAGE EXCURSIONS ABOUT A NOMINAL VALUE
a. Perform preliminary operation as stated in paragraph 2-1 or 2-2.
b. Connect voltage to be observed between INPUT and COMMON posts. If
one side is grounded, always connect it to COMMON post. Deflection to the
left indicates voltage being measured is negative; set polarity switch to negative
position in this case. This will cause meter needle to deflect to the right.
c. Set RANGE switch to lowest range which will give an on-scale meter
indication and note nominal value of voltage indicated.
d. Set the four voltage readout dials to nominal voltage.
e. Turn NULL switch to lowest position that will allow voltage excursions
to remain on scale. l
f. Read voltage excursions from meter. Note that full scale right and
left meter deflections are equal to the NULL range setting (disregarding
10% over-range at end of scale). Meter deflection to the right indicates
that the voltage under observation has increased above the nominal value
while deflection to the left indicates it has decreased.
2-4

871A & 871AB
SECTION III
CALIBRATION
3-1. GENERAL
3-2. The 871A and 871AB should be calibrated as often as deemed
necessary. However, it is recommended that the instrument be
calibrated every six months under ordinary laboratory conditions.
For special applications where extreme accuracy is required, it
may be desired to calibrate the instrument more frequently. Calibration
should be accomplished under typical laboratory operating conditions in
a draft free area with an ambient temperature of 72. 5 (+2. 5)9F for
maximum accuracy.
3-3. For convenience, the calibration procedure is divided into six parts:
Preliminary Calibration, Null Detector Calibration, 10 Volt Range
Calibration, 1 Volt Range Calibration, 100 Volt Range Calibration, and
1000 Volt Range Calibration. Calibration is normally done by performing
all six parts in the sequence given here. However, the calibration
procedure is written so that any section may be calibrated by performing
the calibration procedure for that section after performing the preliminary
calibration procedure. The recommended equipment and the specifications
required for calibration are shown in figure 3-1.
RECOMMENDED
EQUIPMENT
SPECFICATIONS |
REQUIRED |
j DC Power Supply with an |
output of 0 to 1000 volts.
Standard cell with an accuracy
of +0. 002%. The equipment
used must provide |
1000, 100, 10, and |
1 volt with an
accuracy of
+(0. 005% + 5 uv).
Voltage reference divider
having division ratios of
1, 10, 100, and 1000 with
an accuracy of +0. 003%.
Galvanometer suitable for
use with above voltage
reference divider |
Figure 3-1. CALIBRATION EGUIPMENT
3-1

871A & 871AB
3-4.
PRELIMINARY
CALIBRATION
a.
Set
meter
to
zero
with
mechanical
zero
control.
b.
Set
switches
on
871
as
follows:
RANGE 1
NULL
0.
001
polarity
+
(positive)
all
voltage
0
(zero)
readout dials
c.
Set
POWER
switch
to
ON
with
871A
or
to
LINE
OPR
with
871AB
and
allow
instrument
to
warmup
to
equilibrium
temperature
(about
10
minutes).
d.
Set
up
the
necessary
equipment
to
provide
DC
voltages
of
1000,
100,
10,
and
1
volts
with
an
accuracy
of
+(0.
005%
+
5
uv).
Proceed
as
follows:
Turn
on
all
test
equipment
and
allow
it
to
warmup
to
equilibrium
temperature
(about
1/2
hour);
connect
galvanometer
and
standard
cell
bank
in
series
to
standard
cell
terminals
of
divider;
set
proper
standard
cell
voltage
on
divider;
apply
1000
volts
DC
into
1000
volt
input
terminal
of
divider;
zero
galvanometer
by
varying
output
of
power
supply;
voltages
of
1000,
100,
10,
and
1
volts
DC
+(0.
005%
+
5
uv)
are
available
at
the
corresponding
output
terminals.
e,
Connect
CHASSIS
ground
post
to
line
ground.
f.
Remove
top
panel
of
voltmeter.
3-5.
NULL
DETECTOR
CALIBRATION
a.
Short
INPUT
post
to
COMMON
post
and
remove
right
side
panel.
b.
Adjust
electronic
zero
control
R227
until
meter
needle
indicates
zero
when
side
panel
is
replaced.
c.
Set
voltage
readout
dial
C
to
1.
d.
Adjust
tvm
gain
adjust
control
R231
until
meter
needle
indicates
full
scale
deflection
to
the
left
(disregarding
10%
over-range
at
end
of
scale),
when
side
panel
is
replaced.
e.
Remove
short
between
INPUT
and
COMMON
posts.
3-6,
10
VOLT
RANGE
CALIBRATION
a.
Set
switches
on
871
as
follows:
RANGE
10
NULL 1
voltage
readout
10.
0000
dials
b.
Apply
10
volts
DC
(+0.
005%)
between
INPUT
and
COMMON
posts.
c,
Adjust
R119
for
zero
meter
deflection
in
each
successively
more
sensitive
null
range.
3-2

871A & 871AB
3-7. 1 VOLT RANGE CALIBRATION
a. Set switches on 871 as follows:
RANGE 1
NULL od
voltage readout 1. 00000
dials
b. Apply 1 volt DC +(0. 005% + 5 uv) between INPUT and COMMON posts.
c, Adjust R121 for zero meter deflection in each successively more
sensitive null range.
3-8. 100 VOLT RANGE CALIBRATION
a. Set switches on 871 as follows:
RANGE 100
NULL 10
voltage readout 100. 000
dials
b. Apply 100 volts DC (+0. 00595) between INPUT and COMMON posts.
Note that calibration power supply must be readjusted for a galvanometer
null due to loading of voltmeter on voltage reference divider.
c. Adjust R104 for zero meter deflection in each successively more
sensitive null range.
3-9. 1000 VOLT RANGE CALIBRATION
a. Set switches on 871 as follows:
RANGE 1. 000
NULL 100
voltage readout 1000. 00
dials
b.
Apply
1000
volts
DC
(+0.
00595)
between
INPUT
and
COMMON
posts.
c. Adjust
R106 for zero meter deflection
in each successively
more
sensitive
null range.
3-3

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WARRANTY
The
JOHN
FLUKE
MFG,
CO.,
INC.
warrants
each
instrument
manufactured
by
them
to
be
free
from
defects
in
material
and
workmanship.
Their
obligation
under
this
Warranty
is
limited
to
servicing
or
adjusting
an
instrument
returned
to
the
factory
for
that
purpose,
and
to
making
good
at
the
factory
any
part
or
parts
thereof;
except
tubes,
fuses,
choppers
and
batteries,
which
shall,
within
one
year
after
making
de-
livery
to
the
original
purchaser,
be
returnedby
the
original
purchaser
with
transpor-
tation
charges
prepaid,
and
which
upon
their
examination
shall
disclose
to
their
satis
-
faction
to
have
been
thus
defective.
If
the
fault
has
been
caused
by
misuse
or
abnormal
conditions
of
operation,
repairs
will
be
billed
at
a
nominal
cost.
In
this
case,
an
estimate
will
be
submitted
before
work
is
started,
if
requested.
If any fault develops, the following steps should be taken.
1.
Notify
the
John
Fluke
Mfg.
Co.,
Inc.,
giving
full
details
of
the
difficulty,
and
include
the
Model
number,
type
number,
and
serial
number.
On
receipt
of
this
information,
service
data
or
shipping
instructions
will
be
forwarded
to
you.
2.
On
receipt
of
the
shipping
instructions,
forward
the
instrument
prepaid,
and
repairs
will
be
made
at
the
factory.
If
requested,
an
estimate
of
the
charges
will
be
made
before
the
work
begins,
provided
the
instrument
is
not
covered
by
the
Warranty.
SHIPPING
All
shipments
of
John
Fluke
Mfg.
Co.,
Inc.
instruments
should
be
made
via
Railway
Express
prepaid.
The
instrument
should
be
shipped
in
the
original
packing
carton;
or
if
it
is
not
available,
use
any
suitable
container
that
is
rigid.
If
a
substitute
con-
tainer
is
used,
the
instrument
should
be
wrapped
in
paper
and
surrounded
with
at
least
four
inches
of
excelsior
or
similar
shock-absorbing
material.
CLAIM
FOR
DAMAGE
IN
SHIPMENT
The
instrument
should
be
thoroughly
inspected
immediately
upon
receipt.
All
material
in
the
container
should
be
checked
against
the
enclosed
packing
list.
The
manufac-
turer
will
not
be
responsible
for
shortages
against
the
packing
sheet
unless
notified
immediately.
If
the
instrument
fails
to
operate
properly,
or
is
damaged
in
any
way,
a
claim
should
be
filed
with
the
carrier.
A
full
report
of
the
damage
should
be
ob-
tained
by
the
claim
agent,
and
this
report
should
be
forwarded
to
John
Fluke
Mfg.
Co.,
Inc.
Upon
receipt
of
this
report
you
will
be
advised
of
the
disposition
of
the
equipment
for
repair
or
replacement.
Include
the
model
number,
type
number,
and
serial
number
when
referring
to
this
instrument
for
any
reason.
The
John
Fluke
Mfg.
Co.,
Inc.
will
be
happy
to
answer
all
application
questions
which
will
enhance
your
use
of
this
instrument.
Please
address
your
requests
to:
JOHN
FLUKE
MFG,
CO.,
INC.,
P.O.
BOX
7428,
SEATTLE
33,
WASHINGTON

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