Advertisement
MODEL 615 ELECTROMETER
OPERATION
C.
output
Information.
TABLE 9.
Model 4401 minter
outpue
Cards.
Model 4401 Printer
Output
Cards:
Provide
BC,, out-
put and external
Control
of Model 615; may be
purchased
installed
or separately
for
field
in-
stallation
(no wiring
required).
minter
outputs:
BC" positive
output
represents
each of the four digits,
exponene,
sensieivity,
polarity
and overrange.
Standard
code is l-2-4-
8.
"0"
< co.4 volt;
"1"
z 110 volts
at up to
one milliampere:
o=oooo.
Print
Commnd:
Positive
pulse
of 14 volts
from
a zzoo-ohm source with
1 volt
per microsecond
rise
time,
100 microseconds
minimum pulse
width.
print
co,,ms"d give"
after
each A LO D conversion.
Renwte Controls:
Hold iii:
Closure
to ground
inhibits
A to D co"-
version,
ac that
instant.
Hold ,12:
Closure
to ground
inhibits
A to D co"-
version
after
reading
has bee" completed.
trigger:
Closure
to ground
initiates
one conver-
sion when in Hold 02.
Integraeion
period
stares
8.3 ms (10 ma on 50-Hz models)
after
"Trigger"
or release
of Hold 82.
connector:
50-p<*
Amphenol Micro-Ribbon
mou"Led
an Model 615.
O"fp"t
macing connector
supplied
with
4401.
NOTE
The term "Closure
to Ground"
or "Grounded
control
line"
means a shore to common di-
rectly
or through
a saturated
NPN eransis-
tar
(VcE < c0.N).
Only the "COMMON" as
supplied
at the PRINTER/CONTROL co""ector
should
be used for claaures
to ground.
1.
Full
Scale Magnitude.
The full
scale
magni-
tude
for the ~"del
615 is indicated
by three
front
panel
Numerical
Readout indicamr
lights
with
cor-
responding
RCD outputs
as show" in Table
10.
TABLE 10.
3
1 x 101
O,l
4
2 x 101
2,3
28
4 x 101
4,5x6,7
29
8 x 101
8.9
5
1 x 102
0.1
6
2 x 102
2,3
30
4 Y 102
4>5,6,7
31
8 x 102
829
2.
Overrange
Indication.
The fourth
(from
the
right)
Numerical
Readout Indicatar
represmts
the
overrange
or m"se significant
digit.
A" overload
candieia"
is shown by a blanked
readout
with
"nly
the polarity
indicared.
The Model 615 uses one RCD
line
to identify
ehe overrange
digit
and overload
condicio"
as sham
in Table
11.
'TABLE 11
I
33 32
8 7
Overload
C"olm""
Comma"
1 x 103
(2 (4 (8 x x x 103)
103)
103)
O,l
0 0 8
3.
mlarity
IndicaLio".
The poiaricy
is indicat-
ed automatically
by the Polarity
Iadicator
Lighfs
and corresponding
BCD output
as show" in Table
i?.
TABLE 12
OUtoUt
oecima1
Digits
Generated
I
I
38 14
13
39
+15v
common
Polarity
+15v (2 (8 (4 x x
(1
x 100)
100)
x
W)
100)
0,1
0 2 8
I
Four pins may be used to obcai"
BCD polarity
codes
*or external
printers,
where 1010 = + and 1011 =
- printer
characters.
4.
8ensiei"ity
Indication
(mcimal
Point
coca-
Lion).
The
SENSITI"ITY
Switch
has four
positions
which automarically
control
the locaeio"
of the
lighted
Decimal
Point
Indicator.
The decimal
point
location
is also
represented
by a BCD outpue
as
sham
i" Table
13.
TABLE 13
OutpUt
Decimal Digits
Generated
I
Position
1.2
Position
3,4
COIIEW"
C~lmM"
5.
Range Indication
(Exponent).
The Model 615
provides
BCD outputs
corresponding
LO ehe exponent
of the RANGE Switch
88 show" in Table
14.
0470
15
Advertisement
