Voltmeter Accuracy And Frequency; Response Check - HP 333A Operating And Service Manual

Model 333A/334A
Section V
SECTION V
M A I N T E N A N C E
5-1.
I NTR ODUCTI 0 N.
5-2. This section contains maintenance and service
information for the 333A and 334A Distortion Analy-
zers. Included a r e Performance Checks, Adjustment
and Calibration Procedures, and Troubleshooting
Techniques.
5 - 3 . REQUIRED T E S T EQUIPMENT.
5-4. The e uipment needed to properly maintain the
Model 333A7334A is listed in Table 5-1. If the re-
commended model is not available, any instrument
that has specifications equal t o or better than the
re-
quired specifications may be used.
5-5. PERFORMANCE CHECKS.
5-6. The performance checks
are
in-cabinet proce-
dures that can be used to verify instrument perform-
ance. These procedures can be used for periodic
maintenance, to check specifications after a repair,
or for incoming quality control inspection. Perform-
ance checks for both the 333A and 334A are provided.
The performance checks
are
applicable toboth instru-
ments except where noted
in
paragraph heading.
5-7. The performance checks a r e made with the ac
power cord connected to nominal line voltage (lOOv/
120V/ 220V/ 240V, 48 to 66 Hz), MODE SWPTCH to
MANUAL,
HIGH
PASS FILTER to OUT, and NORM.
-
R F. DET. switch to
NORM,
unless otherwise
specified.
5-8. A Performance Check Test Card is provided
at
the end of this section for recording the performance
of the instrument
during
the performance checks. The
card may be removed from the manual and used
as a
permanent record o f the incoming inspection or of
a
routine performance check. If the instrument fails
to meet any of its specifications, perform theAdjuat-
ment and Calibration Procedures, Paragraph 5-23.
5-9.
VOLTMETER ACCURACY AND FREQUENCY
RESPONSE CHECK.
a .
b.
C.
d .
e.
f.
g.
Conned voltmeter calibrator t o 333A/334A
as shown in Figure 5-1. Test oscillator
w i l l be used later in check.
METER.
Set voltmeter calibrator for 400 Hz r m s
output.
Check 333A/334A voltmeter
f u l l
scale read-
ing
on
all ranges
against
appropriate rms
input from voltmeter calibrator. Voltmeter
accuracy should be within &2%.
Disconnect voltmeter calibrator.
Set 333A/334A FUNCTION Switch to VOLT-
Connect 5 0 5 2 output o f test oscillator, term-
inated in 5052, to 333A/334A.
Set 333A/334A METER RANGE switch to 3
VOLTS.
VOLTMETER CALIBRATOR
hp
738BR DISTORTION ANALYZER
hp
333A/334A
c .
r~
tt
0 0 0
(9
' '
0 0 6
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I
I
TEST OSCILLATOR
I
hp
6521
I
-
son
FEED-THRU
I
TERMINATION
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S S A - B - 1 4 6 8
9 - 8
f i L
Figure 5-1.
Voltmeter
Accuracy and Frequency Response Check
5-1