HP 3455A - Page 50

Section
IV
Model
34S5A
TEST
OSCILLATOR
DIGITAL
VOLTMETER
PROCEDURE:
Appiv
accurate
dc
voltage II
V
or
3 V)
from
OC
Standard
to
Thermal Converter and adjust
DC
Differential Voltmeter for
null. Disconnect
the
DC Standard and
apply
the Test Oscillator
output to
both the Thermal Converter and the
3455A. Ad)ust
the
Test
Oscillator
output
level for
a
null indication on the
OC
Differential Volirrteter. This makes the rms value of the
ac
input
to the 3455A
equal
to
the highly accurate
output of the DC
Standard. Repeat this procedure each time the Test Oscillator
frequency is changed.
Fioura
4-5.
AC/OC
Thaniial Trtmftr MuturtMitt (Altarnat*
Frgqueficy ResponM Tmi).
a. Set the 34SSA controls as follows;
FUNCTION
ACV
RANGE I V
GUARD ON
INPUT SELECT FRONT
b.
Set the AC Calibrator for an output of
1
V, 30 Hz
(74SA 1
V
range). Set the AC Calibrator’s error
measurement control to offset the 1
V,
30 Hz error in-
dicated
on the calibration chart (745A 0.1 error range).
c.
Connect the output of the AC Calibrator to the
3455A front panel INPUT.
d. 1. Standard Model 3455A: The3455A 1
V,30Hz
reading should be
within
the Test Limits listed
in
Table
4-13.
2. 3455A Option 001: The 3455A 1
V.
30 Hz
(ACV)
reading should be
within
the Test Limits
listed in Table
4-IS.
e. 1. Standard Model 34SSA: Using the AC
Calibrator,
verify
the 34SSA ac
voltmeter
ac-
curacy for each Test Frequency, Input Level
and 3455A Range listed in Table ^13. The
345SA display readings should be within the
Test Limits given
in the table.
2. 3455A Option 001: Using the AC Calibrator,
verify
the 345SA ac
voltmeter
accuracy for each
Test Frequency
(ACV),
Input
Level
and 3455A
Range
listed in Table
4-15.
The 345SA display
readings
should be
within
the
Test
Limits
given
in the table.
f. Set the 3455A FUNCTION
to
FAST ACV.
g.
1. Standard Model 3455A: Using the AC
Calibrator, verify the 3455A ac voltmeter ac-
curacy (Fast ACV) for each Test Frequency
above
100 Hz, each Input
Level
and 34S5A
Range listed in Table
4-13.
The 345SA display
readings should
be
within the Test Limits given
4-13