Frequency Calibration Accuracy Check - HP 333A Operating And Service Manual

Section
V
Model 333A/334A
C.
d.
e.
f.
e.
h .
Set test oscillator frequency
to
500
Hz,
and
adjust amplitude for indication
of
+2
d~ on
333A/334A meter.
Set 333A/334A FUNCTION switch to DIS-
TORTION.
Adjust 333A/334A frequency
dial
vernier and
BALANCE
controls for minimum meter in-
dication. When
meter
indication is lessthan
10% of SET LEVEL indication,
set
MODE
switch to AUTOMATIC.
Reduce 333A/334A METER RANGE setting
as necessary
to
maintain on-scale meter
indication.
333A/334A meter indication should be
at
least 70
dB below +2 dB
reference.
Repeat steps b through
g
w i t h 333A/334A
and
test
equipment frequencies set
to
250
kHz
and
600
IrHz. 333A/334A meter i n d i -
cation should be at least
64 dB
below +2
dB
reference.
5-13. FREQUENCY CALIBRATION ACCURACY
CHECK.
a . Connect test equipment to 333A/334A as
shown in Figure 5 4 . Set electronic counter
to read period.
b .
C.
6
e.
f.
g*
h.
NOTE
In this check, the 333A/334A
frequency
dial
is held constant
and monitored. If the dial i s low,
the input frequency
will
be
high
at
null and vice versa.
Set 333A/334A controls
as
follows:
FUNCTION
-
SET LEVEL
SENSITIVITY..
. . . . . . . . . . .
MAX.
METERRANGE
. . . . . . . . . . . .
ODB
MODE..
. . . . . . . . . . . . .
M.ANUAL
FREQUENCYRANGE
. . . . . . . . . .
X l
Frequency Dial.
. . . . . . . . . . . . .
10
Set test oscillator frequency to 10 Hz, and
adjust amplitude for indication of
+2
dB on
333A/334A meter.
Set 333A/334A FUNCTION switch to
DISTORTION.
Do not adjust 333A/334A frequency controls.
m j x
test
oscillator frequency and 333A/
334A
BALANCE
controls for minimum indi-
cation on 333A/334A meter.
Repeat stepe until best null
is
indicated on
333A/334A. Reduce METER RANGE setting
as
necessary to maintainon-scale meter
indication.
Electronic counter should indicate period of
100 meec
f
5 m8ec (10
Hz
f
5%).
Set electronic counter
t o read frequency.
Repeat Steps b through f
for
each frequency
listed in Table 5-4. At each respective
frequency setting, electonic counter should
indicate that
test oscillator
frequency ie
and the input frequency i s varied within tolerances listed in table.
ELECTRONIC COUNTER
hp
5532A
TEST OSCILLATOR DISTORTION ANALYZER
hp
652A
hp
333A/334A
d
0 - 0 0 9
c l u
0
0
U14-I-14S7
6oon
FEED-THRU ADAPTER
hp
1 1 0 9 5 ~
hp
Port NO.
TERMINATION BNC
"Tu
1250-0072
Figure 5-4. Frequency
Calibration
Accuracy Check
5 -4