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MODEL 615 ELECTROMETER
OPERATION
TABLE 14
I
Connector
Decimal Digits
Pin NO.
Output
Generated
I
9
10
34
35
11
12
36
37
1 x 100
100
Exponent
021
2 v
Exponent
223
4 x 100
100
Exponent
495,637
8 x
101
Exponent
899
1 x
Exponent
031
COUSIIO"
COUSUO"
Common
The print-out
of the RANGE switch
expanent
uses 2
coluums to represent
information
far
exponents
from
00 thru
12.
The exponent
must be interpreted
as
positive
or negative
depending
on the parameter
(am-
peres,
coulombs,
or ohms).
b)
"HOLD 2".
This control
inhibits
A ta D con-
version
after
a complete
reading
cycle.
Further
conversions
are inhibited
as long as a closure
to
ground
is made.
The c""ve=slo"
cycle
will
resume
immediately
when the "HOLD 2" line
is opened.
c)
"TRIGGER".
This
control
initiates
one com-
plete
conversion
when "HOLD 2" line
is grounded.
Closure
to ground may be momentsry
or any longer
duration
to initiate
a conversion.
6.
The ""de1
615 with
Model 4401 Printer
Output
Cards also
provides
ee,,wte control
commanda for ex-
ternal
devices.
These commands are described
fully
in Paragraph
2-10,
d.
d)
"PRINT
COMMAND". This
control
provides
a
positi"*
going
pulse
of 14 volts
after
a complete
A to D conversion
is made end all
data
line
out-
puts are final
readings.
7.
Examples
of e typical
printer
output
for vari-
ous Model 615 readings
are show" t" Table
15.
In
the examples
the p=<ntl"S
davice
1s assumad to co"-
tain
fonts
of digits
0
to
9.
In this
case,
eight
columns ere needed to print
all
date.
4.
Power Supply
Voltages.
The PRINTER/CONTROL
Connector
also
provides
p"we= supply
u"ltaSes
of
+15, -15,
and ~3.6 valta
as shown in Table
16.
d.
External
Control.
TABLE 16
1.
To obtain
optimum system performance,
it
is
often
desirable
to operate
the Model 615 synchron-
""sly
with
other
digital
equipment,
such a8 printers,
paper
tape punches,
computers
and other
data handling
devices.
The Model 615 with
4401 Printer
Cards in-
stalled
provides
several
printer
control
commands for
the purpose
of synchronizing
external
equipment
to
schieva
maximum conversion
rates.
I
Maximum
VOltaRe
'aed Current
Pin
No.
I
+3.6V
r
+15v
-15V
+50 In4
18
Cl0 mA
14,17,39
-10 IsA
42
I
2.
Several
alternate
approaches
may be used in de-
signing
the overall
system control
scheme.
a)
The Model 615 can be used to provide
maste=
control
of external
devices
so that
the maximum
possible
conversion
rates
ca" be obtained.
5.
High and Low Reference.
The PRINTER/CONTROL
Connector
provides
tw" Reference
Voltages,
High
(+SV) and Low (c2V).
These levels
may be used to
define
the "HIGH" and "LOW" digital
output
states
for' external
printing
or computer
devices.
Front
Panel
Diaital
Readout
+0.275
+1.347
-086.4
-(blank)
+(hla"kj
+oo.oo
-.1632
+19.99
b)
A" external
device
ca" also
be used for
mester
control
such 8s a high
speed printer.
c)
A completely
independent
"master
clack"
can
be used for
system control
for maximum flexibility.
3.
Description
Of external
controls.
a)
"HOLD 1".
This control
inhibits
A to D co"-
version
at the instant
a closure
to Sraund is
made.
The conversion
cycle
will
=esume inmediate-
ly when the "HOLD 1" line
is opened.
TABLE 15.
Range Switch
Significant
;
setting
Polarity
E Digit
6. Overlosd
I
i
Renge
Msg.
i
sells.
i
mp.
I"t*CpC*t~tiLW
1O-5 AMPERES
+
i
0
!
!
109 OHMS
275
1
05
+.2?5 x 10-5
+
i
1
i
347
1
09
+1.347 x lo9 amp
ohms
VOLTS
0
1
lo-l1
AMPERES
F
864
i
3
I
00
-R6.4 volts
:
000
-
.
11
averlaad
10-7 COULOMBS
.i
:
negstive
+
!
:
000
;
-
07
positive
overload
VOLTS
+
0
i
:
000
1
2
I
00
+oo.oo volts
VOLTS
1
632
0
00
-. 1632 volts
10-7 AMPF,RBS
i
+
1
f
999
j
2
E
07
+19.99 x 10-7 amp
I 04
16
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