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OPERATING INSTRUCTIONS
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----
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X
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SOURCE
3-S.
HOW TO MEASURE RESISTANCE.
be used to measure resistance from
ohms.
Although the Model
purpose ohmeter, it has certain characteristics
which enable reliable
measurements
resistances with
response.
fast
CAUTION
2 5 0
Up
volts
to
may
Normal
Ohms Measurements.
a.
Mode
l
Hod
616
e
measures resistance over a wide range.
use of the NORMAL mode
is
to lOll
(use the FAST mode for larger
up
ohms
616
The Model
tances).
for measuring resistance.
is proportional to the voltage developed across the
input terminals.where V
selected in decade steps using the RANGE Switch).
616
use the Model
as an ohmmeter, set the front panel
controls as follows:
105
OHMR
RANGE
AUTO
SENSITIVITY
FAST/NORMAL
NORMAL
TABLE 3-5.
HOW TO SELECT APPROPRIATE OHMS RANGE.
Appropriate
Range
Resistance to
be Measured
1
1
10
2
10
4n
1
1
3n
10
2
10
1
1
10
2
10
2n
11
11
10
n
10
10
10
10
10
n
10 9
10 9 n
S
108 n
lO
107
107 n
6
6
10
10
n
105
105n
105
104 n
103 n
105
Q
102
105
10
-
.
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9 .
FIGURE
Operation As An Ohmmeter in NORMAL Mode
616
The Model
1
ohm to 2 x
616
is useable as a general
of very large
be
present at cerminals.
In
mode, the
this
recommended for
measurements
resis
uses a consta.nt current method
There, the digital readout
=
I x R
(the current I is
(or
appropriate
other
range)
Appropriate
Sensitivity
100
100.0
x
V
10.00
x
10
V
x
1
000
V
1.
1. 000
1
x
V
1
1. 000
V
x
1
1. 000
x lO
V
1
1.000
x
V
1.000
x
1
V
1.000
x
1
V
1.000
x
1
V
.1000
x
V
1
x
100
.01000
mV
x
10 mV
.00100
.- _ _ _ - -- --
I
I
- I
INPUT
E/R
I
=
: 1
I
R
V
LO
I.
________________
can
Connect a Model
1014
triaxial cable)
length as short as possible to reduce the slowing
effects of cable capacitance.
need occasional adjustment to reduce any voltage
offset which may occur due to the
tions.
To
CHECK
switch to
ZERO control
The
L.
Fast Mode Ohms Measurement.
measures very large resistances with
Model 616
To
FASt, the unknown resistance
with respect to the low side of the voltage ampli
fier.
The unknown resistor is connected across the
80
feedback
and therefore speed up the measuring time.
616
the Model
the front panel controls as follows:
SENSITIVITY -- AUTO
1
FAST/NORMAL -- FAST
10
2.
12�A
10
n
1
Connect the unknown resistance between input HI and
10
2
n
11
GUARD
(on the rear panel).
10
n
10
10
n
9
n
S
10 7 n
n
10
6
n
10
10 5 n
When the FAST mode is used for resistance meas
urements, the unknown resistance sample is con
104 n
3
nected in feedback around the electrometer
n
10
amplifier.
Q
10
2
floating and not referenced to LO.
-
-
- ---
FIRST STAGE
X l OUTPUT
AMPLIFIER
E
::.
ELECTROMETER
I x
V
Rx
6011
Triax cable
(or other shielded
the INPUT receptacle.
to
The �ero control may
temperature
616,
set the ZERO CHECK
rezero the Model
position and adjust the front panel
0-0-0-0
a
display.
for
resistances
When the FAST/NORMAL switch is set to
(Rx)
as to reduce the effects of capacitance
for FAST ohmmeter measurements, set
1
--
10
2
RANGE
OHMS
NOTE
Therefore the resistance must be
MODEL
616
-.
-
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J
Keep
cable
varia
In this mode, the
fast
larger than
is floating
To use
04 7 6
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