Section
V
DC
Standard
output
IV
3v
.O
1
10
v
.03
30
V
.I
100
v
.3
300
v
1
300
V
3
300
V
IO
300
V
30
300
V
3
Range
Series
Resistance
I.00M
t
0.1%
1
.OOM
t
0.1%
1.00M~O.I%
1
.OOM
2
0.1%
I
.OOM
2
0.1%
1.00M?
0.1%
300K
iO.l%
1/2
W
lOOK
20.1%
1
W
30K
2
0.1%
5
W
30K
to.]%
5
W
Model
4
12A
Table
5-2.
Milliammeter Accuracy Check
Model
4
1
2A Reading
(
2%
of full scale)
1
.o
3
.O
1
.o
3
.O
1
.o
3
.O
1
-0
3
.O
1
.o
1
.O
(on
3
scale)
c.
Connect Precision Resistor in series with MA lead
and positive side
of
dc standard output. Connect
412A
COM lead to dc standard negative output
terminal.
Paragraph
5-10.
changes. Figure
5-9
shows simplified ammeter switching
circuits.
5-12.
OHMMETER
ACCURACY
CHECK.
d. Perform checks listed in Table
5-2.
a.
Set
FUNCTION
selector
to
OHMS.
NOTE
It is not necessary
to
check higher current
ranges.
On
current ranges
10
through
1000, the current shunt does not change.
Only the voltage divider, checked in
b. Connect, in turn, resistor
of
1,10,100,1
K,
10
K,
100
K,
1
M,
10
M,
and
100
M
ohms+I.O%
between MA/OHMS and COM leads. With
appropriate RANGE setting, meter should indicate
between
0.95
and
1.05
in each case.
-hp-
MODEL
412A
DC
STANDARD
-hp-
MODEL
738BR
I
I
~
Figure
5-1.
Input Resistance Check
5-2
001
29-5
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