Table of Contents
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Section
V
DC
Standard
output
I V
3 v
. 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
i O . 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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