X]O Range Frequency Calibration - HP 652A Operating And Service Manual

Section V
f. Record the dc voltage at A2TP2.
NOTE
This voltage wz1l be t he ref erence voltage
referred to in the remaining section of the
Frequency Calibration procedure.
g. Set 652A FREQUENCY dial to 1 0. Readjust SI C2
and S I C 7 alternately (See Table 5-6) until frequency
10
indicated on counter is
same as reference voltage recorded in Step f ± 1 0 m V.
h. Check frequency tracking of the dial using settings
and tolerances given in Table 5-7 for the XIK RANGE.
A2TP2 voltage should not vary more than 40 m V from the
f.
voltage recorded in Step
Table 5�7. Frequency Dial Accuracy Calibration.
Frequency
Frequency
Dial Range
1 X l 0
2 X l 0
Xl0
5
Xl0
8
1 0 Xl0
1 Xl00
Xl00
2
5 Xl00
8
Xl00
1 0
Xl00
1 X 1 K
2
X 1 K
5 X1 K
X1 K
8
10 X 1 K
1 X l 0 K
2 Xl0K
5 Xl0K
8 Xl0K
10 Xl0K
1 XlooK
2 Xl00K
5 Xl00K
X l 00K
8
10 Xl00K
X I M
1
2 X I M
5 X I M
8 X I M
10 X I M
5-1 2
kHz and A2TP2 voltage is the
Counter
Indication
(counter set to read
period average)
100 ± 3
ms
50 ± 1 .5
ms
± 0.6
20 ms
±
1 2 .5 0.38 ms
± 0.3
10 ms
1 0 ± 0.2
ms
± 0.1
5 ms
2 ± 0.04 ms
± 0.03 ms
1 25
1 ± 0.02 ms
(counter set to read
frequency)
Hz
1 .000 ± 20
4!l
Hz
2 ,000 ±
Hz
5,000 ± 100
Hz
8,000 ± 160
kHz
±
1 0 . 0 02
kHz
1 0 .0 ±
02
kHz
±
20.0 0.4
kHz
50.0 ±
1 .0
kHz
80.0 ± 1 .6
kHz
100.0 ±
2 .0
kHz
100.0 ± 2.0
kHz
200.0 ±
4.0
±
kHz
500.0 10
kHz
800_0 ± 1 6
±
kHz
1 ,000 20
kHz
30
1 ,000 ±
kHz
2 ,000 ± 60
kHz
± 150
5,000
kHz
8 ,000 ± 240
+
kHz
10,000 300
5-31. X l 00 and X l 0 K Range Frequency Calibration,
a. Connect equipment as shown in Figure 5�8.
b, Check frequency tracking of FREQUENCY dial at I ,
2 , 5 , 8, and 1 0 on the XIOO and XIOK ranges (See Table
5- 7) while monitoring voltage at A2TP2, At I and 1 0 on
the dial, A2TP2 voltage should be within ± 20 m V of
reference voltage noted in Paragraph 5-30, Step
entire range of the dial, A2TP2 voltage should not vary
more than 40 m V.
c. On each range, if frequency or A2TP2 voltage is not
correct at I on dial, change the value of RANGE switch
resistors (Table 5-6) for that range. (The two resistors
should be changed simultaneously for the best results,)
d. On XIOK range, if the frequency or A2TP2 voltage is
not correct at 1 0 on dial, change the value of the padding
capacitor, S I C I 3 , Table 5-6.
5-32. X l 0 Range Frequ ency Calibration.
a. Connect equipment as shown in Figure 5-8.
b, Set 652A FREQUENCY RAl 'l GE to XIO. Check
frequency as indicated on counter (See Table 5-7) at I and
10 positions of FREQUENCY dial.
c. If either frequency or A2TP2 voltage is not within
tolerance, change values of S1 R 1 * and Sl R 1 4 * (Table 5-
simultaneously to bring frequency within tolerance and
maintain A2TP2 at required voltage (within + 0.00 V,
- 0,05 V of reference voltage noted in Paragraph 5-30, Step
f.
NOTE
It may be necessary to split dif f erence in
f requency between the two ends of the dial.
d. Check frequency at the 2 and 5 positions of the dial.
If
not within tolerance (Table 5- 7), repeat Paragraph 5-30,
Steps b and c.
5-33. X 1 M Range Frequency Calibration,
NOTE
The f ollowing adju stments are critical. For
each adjustment, remove covers and make the
adjustment; then replace covers bef ore makin g
frequency o r voltage tests. I f desired, Figure
5-10
gives a scaled drawing of top and bottom
alignment access covers with cut-outs that will
allow adjustments while
place. T he dimensions are given in inches.
a, Connect the equipment as shown in Figure 5-8,
bOllA
Model
f;
over the
6)
the covers are in