HP 3490A - Page 80

Model
34904
PERFOBMANCE
CHECKS
Section
V
c.
Connect dc
standard
between Higfr terminal
and
the
3490A
chassis.
d. Set
dc
standard
output to
+
500.00
V.
3490A
reading
should not change
more than
0.00005 V, verify-
ing
dc
common-mode
rejection > 140 dB,
where:
Peak
common-mode
voltage
ECMR
=
20log
"
Effect on reading
(volts)
with Guard connected to
High. A
dc
standard
(-hp-
7zt0B) is
required for this
test.
a.
Connect
a I kQ resistor
between
input High
and
Low
terminals,
and connect High to
Guard as
shown
in
Figure
5-2.
b.
Set
3490A
FUNCTION to
DC.
RANGE to
I V.
Note
3490A
display.
Table 5-3. AC Voltmeter
AccuracY.
3490A
Range
Test Sisnal
3490A
Max
Display Error
Test
Signal
Source
Other Equipment
Required
voltago
Frequency
1V
1V
1V
10v
10v
10v
100
v
100
v
1000
v
1000
v
1V
1V
1V
1V
5V
10v
10v
100 v
1000 v
1m0 v
2Q
Hz
10
kHz
100 kHz
100
kHz
2O
kHz
2Q
Hz
100
Hz
50
kHz
1O kHz
100 Hz
t
400 counts
t
125 counts
r
125 counts
t
35 counts
t
75 counts
t
40O counts
t
35 counts
t
125 counts
t
135 counts
r
125 counts
AC Calibrator
1V
1V 25O
kHz *
810 counts
Test Oscillator
1
V Thermal
Converter
DC Differential
Voltmeter
10v 3V 25O kHz
t
285 counts
Test Oscillator
3
V
Thernul
Converter
DC Differential
Voltmeter
Table
54.
Ohmmeter Accuracy.
39OA
Rang Docade Sotting Display Limits
.1
ko
lkn
10
ks}
100 ko
1,Oq)
ka
10,000 ko
100 sr
1ks}
10
kn
100
ka
lMO
10
MO
.099983 to .100017
0.99988 to 1.00012
09.9988
to
10.OO12
099.988 to
1O0.012
0!X,9.86 to 1000.14
09996.3 to 10003.7
Table
5€. Alternate
Ohmmeter Accuracy Test.
3490A
Range
Resistor
Display
ToleranceValue Toleranca
.1 ko
1k:)
10
ko
1OO
ko
1,000 ko
10,000 ks)
90to
110o
90O
to 1.1 ko
9koto11
ksl
90kOto110kO
90O
ko
to 1.1
Msl
gMf}to
11MO
t
o.oo25%
r
0.0025%
t
O.OO25%
r
0.0025%
r
0.005%
r
0.01%
t
17 counts
t
1 2 counts
t
12 counts
t
12 counts
*
14 counts
I
37 counts
DC STANDARO
/
DIFFERENTIAL
VOLTMETER
hp 74OB
eEo@oo
OUTPUT
CAELE
ho llO55B
5490Ä
-a -
29a!
Figure 5-2. DC Gommon-Mode Rejeaion
Test.
5-3
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