HP 334A - Frequency Calibration Accuracy Check

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 with 333A/334A
and
test equipment frequencies set to 250
kHz and 600 IrHz.
333A/334A meter indi-
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 54. 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 is 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 .......... Xl
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.
mjx 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 to 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 is varied within tolerances listed in table.
ELECTRONIC COUNTER
hp 5532A
TEST OSCILLATOR DISTORTION ANALYZER
hp 652A hp 333A/334A
d 0-0 09 clu 0
0
U14-I-14S7
6oon FEED-THRU ADAPTER
hp 11095~ hp Port NO.
TERMINATION BNC "Tu
1250-0072
Figure 5-4. Frequency Calibration Accuracy Check
5 -4