Keithley 153, Инструкция по эксплуатации, Страница: 13 / 51

MODEL 153 OPERATION
TABLE 1. Model 153 Vo l
t
a
g e
Input Resistances and Current Input Resistance, V
o
ltag
e
Drop
and Ma>:imum Curr�l1t Overload by Ranges. Maximum Curn:nt O\'I.:rlolld is the
� . rl:atcsl lurrLf�t
for
the
l"<lllge
\,hi�h \,ill
not damal:;l:
thl.:
rangl.: resistor.
Voltage Input Resistance with Current Input Voltage Maximum
Range FUNCTION Range Resistance Drop Current
switch set to: Overload
OPEN R - 2M
rnA
10 microvolts
-
2 0
M
-1.8 M.
10 picoamps 1
M.
10
t:V
O. :)
:30
m
i era
\' 0
1 t
�
-
50
H
-1.9 M
30 picoamps 1
!-1
30
..
\'
O.
c)
100
111
i
c r II \' ,)
1
t
�
-200
H
�2
�1
100
picoamps
1
:1
100
·V
,-
V. 'j
300 microvolts -200
H.
-2
M.
300 picoamps 1 1'1 .
:300
,iV
0.)
1
mil l ivolt
-ZOO
H
-2
H
1
n an o
a
m
p
1
H
1
m\' 0.5
3
millivolts -200 H
-2 M.
3
n an o a m p s
1 :-t 3
mv
0,)
1
0 millivolts -200
H. -2 M.
10 nanoamps
1 M.
1 0
mv 0.5
30 millivolts -200
1'1
-2 11:
30 nanoamps
1
0
0
k 3
mv
1.6
1
0
0 millivolts -200
11.
-2
ri.
1
0
0
nanoamps
100 10
mv
1.6
300 millivolts ·200
11.
-2
M:
300 nanoamps
10
k 3
my
5
1 volt
-200
11-:
-2
11.:
1
microamp
10 k:. 10
mv
5
3
vol
ts
200 r-t: -2
11;;
3 microamps
1 k' 3
my 16
10
volts 200
11�
-2 Mr. 10
microamps
1 k::
10
my
16
30 volts
200
-2 r-t: 30 microamps
100
,
..
3
mv
50
100 volts 200
l-L
-2
M.�
1
0
0 m
i c
r
o
a
m p s
1
0
0
.
.
10
mv
50
300 volts 200
11� -2 M);
3 0
0
microamps
10
..
3
mv
160
1000
volts 2
00 M)1
-2
M;")
1 milliamp
10
�
10
mv
160
'
.
3
milliamps
-1
11
3 mv
500
10
milliamps
-1 n 10
mv 500
nl'
. .. .. .
.... 1
n
30
mv 500
JU
...... LJ.Ldllli'S
100 milliamps
-1
I!
100
mv 500
2-5. CURRENT MEASUREMENTS. S
e t the
FUNCTION
Switch to AMPS. Select the range using
the
RANGE
Switch. Make sure low resistance leads
are used to connect the source to the Hodel
153
input to minimize
input voltage drop. Refer to Table
1
for
the
voltage
d
r
op
by ranges
and for the maximum allowable current ov e r l oa
d
which will
not damage the instrument.
On
all ranges momentary
o
ve r l o a d s will
only cause
t
e
m
p
o r a ry zero offset and instability.
Prolonged overloads exceeding the values in Table
1
may
damage the
current-sensing resis­
tors.
2-6. FLOATING OPERATION.
B.
The Model 153 c a n be
c o n
n e c
t
e d between two potentials, n e it h e
r
of which
is
at
pOt,er
+
line
ground.
It
can be floated up
to -500
volts
off
ground. Triaxial connectors are
especially useful when operating the
low
terminal
at a
different potential from the ground
terminal.
7