HP 3455A - Page 43

Section IV
Model 3455A
TEST OSCILLATOR
DIGITAL
VOLTlieTER
PROCEDURE:
Apply accurate dc voltage II V or 3 V) from
DC
Starulard
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 34S5A. Adjust
the
Test
Oscillator
output level for a null indication on the DC
Differential Voltmeter. This makes
the
rms value of the
ac
input
to the 3455A equal
to
the highly accurate
output
of the
DC
StarKfard.
Repeat this procedure each time
the
Test Oscillator
frequency is changed.
Figure
4-3. AC/DC Thermal Transfer
Measurement
(Altarnete Frequency Response
Test).
a. Set the 3455A
controls as follows:
FUNCTION
ACV
RANGE
1 V
GUARD
ON
INPUT SELECT
FRONT
b. Set the AC Calibrator
for an output of 1 V,
30
Hz
(745A 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 34S5A: The
3455A 1
V.
30 Hz
reading should
be
within
the Test
Limits listed
in Table
4-4.
2. 3455A Option 001:
The 3455A 1 V,
30 Hz
(ACV) reading
should be
within
the
Test Limits
listed in Table
4-6.
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
4-4.
The
3455A display readings should
be
within
the
Test Limits given
in the table.
2. 34SSA 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
4-6.
The 34SSA display
readings should be within
the
Test
Limits given
in the table.
f. Set the
3455A FUNCTION to FAST ACV.
g.
1.
Standard Mode) 34SSA:
Using the AC
Calibrator,
verify
the
3455A ac voltmeter ac-
curacy (Fast ACV) for each
Test Frequency
above
10 kHz, each Input Level
and 345SA
Range listed in Table
4-4.
The 3455A display
readings should be within the
Test Limits
given
in
the table.
2.
34S5A Option 001: Using the AC
Calibrator,
4-6