HP 3438A Operating And Service Manual page 28

Model 3438A Section
IV
AC CALIBRATOR
h
D
7 4 5 A
MULTIMETER
hp 3 4 3 8 A
HIGH VOLTAGE AMPLIFIER
hp 7 4 6 A
Figure 4-2. AC Voltage Accuracy Test.
c. Set the Multirneter function t o - 1nA and range
4-14. A C Ammeter Accuracy Test.
to 2 0 0 p A.
4-15. An A C Callbrator and A C Current Source a r e
d . Check all the Multimeter ranges, using the values of required for this test.
KA and differential voltmeter readings shown in I'able 4-
4,
display s h o u l d i n d i c a t e w i t h i n t h e
a . Connect the equipment as shown in Figure 4-4
limits provided.
using the decade resistor box t o select the value of
Kt\.
Set
the Multimcter function to - m A . Using the values of K A
Table 4-4. D C Ammeter Accuracy.
and A C Calibrator outputs ahown in rable4-5, check the
2 0 0 ~ A, 2 m A and 20 m A Multirneter ranges at the
frequencies listed.
Range
200pA
2 m A
20mA
200mA
2000 mA
b. T o check the 200 m A and 2000 m A ranges, it will be
necessary to use a n a c current source. Connect the a c
current source to the Multimeter a s shown in Figure 4-5.
Current
Level
1 0 p A
5 0 p A
100 PA
.1 rnA
.5 rnA
1 mA
1 rnA
5 rnA
10 mA
1 0 m A
50 mA
100 mA
100 mA
500 mA
800 mA
c.
Check the Multimeter 200 mA and 2000 mA ranges
l'or- the tolerances listed in l able 4-6.
4-16. Ohmmeter Accuracy Test.
RA
100kC2
?0.01%
1 k C 2
?
0.01%
1 k C 2
+-
0.01 %
lOC2
+
0.01%
1 C 2
+
0.02%
4- 17. A precision resistive decade box is required for this
test. This resistive decade should be calibrated t o within a
tolerance of
k
.0057h.
Differential
VM Reading
1.0000V
5.0000V
10.000 V
.10000 V
.50000 V
1.0000 V
1.0000 V
5.0000 V
10.000 V
.10000 V
,5000 V
1.0000 V
,10000 V
.50000 V
.SO000 V
a. Set the Multimeter to the k1L function and the 2011
range.
Multirneter
Display Limits
9.8to10.2pA
49.7to50.4pA
99.5 to 100.5 p A
,098 to ,102 mA
.497 to .504 rnA
.995 to 1.005 mA
.98 to 1.02 mA
4.97 to 5.04 mA
9.95 to 10.05 mA
9.8 to 10.2 mA
49.7 to 50.4 mA
99.5 to 100.5 mA
97 to 103 rnA
495 to 505 rnA
793 t o 807 mA
NOTE: Abbreviated Performance Tests are in bold type.
b. Connect the equipment a s shown in Figure 4-6.
Table 4-5. AC Ammeter Accuracy Test (200 p A Thru 20 mA Ranges).
Range
200 PA
2 mA
20 mA
AC Calibrator
Output Level
2.02 V
20.02 V
20.02 V
AC Calibrator
Frequency
100 Hz
100 Hz
100 Hz
R~
Value
100 k C 2
+
. l %
100 k C 2
+
. l %
10 k C 2
+
0.1 %
Current
Level
20 pA
.2 mA
2 mA
Multimeter
Display Limits
19.4 to 20.6 PA
,194 to ,206 mA
1.94 to 2.06 rnA