Expanded Monitor Calibration - HP 652A Operating And Service Manual

Model 652A

5-41. Expanded Monitor Calibration.

5-42. 10 kHz Monitor Calibration.
a. Set 652A controls as follows:
FREQUENCY RANGE
FREQUENCY dial . . . . . . . . . . . . . . . . . . . . I
ATTENUATOR . . . . . . . . . . . . . . . . . .
OUTPUT MONITOR . . . . . . . . . . . . NORMAL
OUTPUT AMPLITUDE
and VERNIER . . . . . . Adjust for a monitor
b. Connect dc voltmeter to A3TPI ; voltmeter should
indicate - 9 V ± 0.2 V. If it does not change value of
A3C4* and/or A3CS*.
c. Connect dc voltmeter to A3TP2 , and vary REF SET
controls from minimum to maximum. Voltage at A3TP2
must range from - 16.4 V to - IS.8 V, with a maximum
voltage variation of 3.6 V. If voltage is too high, slightly
decrease value of A3RIS*. If voltage is too low; slightly
increase value of A3RIS*_
d . Connect 652A to ac differential voltmeter as shown
in Figure 5-9.
e.
Adjust 652A AMPLITUDE controls for a 3 .000 V
indication on differential voltmeter.
f.
Set 652A OUTPUT MONITOR to EXPAND, and use
REF SET controls to set a zero reference on 652A
expanded monitor scale. Do not readjust REF SET controls
once reference is obtained.
g. Adjust 652A OUTPUT AMPLITUDE and VERNIER
controls for a 3 .075 V indication on differential voltmeter.
(This is a 2.5% increase in 652A output.) 652A monitor
should indicate approximately
scale (blue scale).
h. Adjust A3RI4 for a 652A monitor indication of
+
2.5%. Repeat Steps e through g until no adjustment is
needed.
TEST OSCILLATOR
hp 652A
<$ @ = @
652A·e·'OS07A
.
. .
. . . . . . . XlOK
. . _
3.0 V
indication of 3.0 V
+
2.5% on expand monitor
@
50 OHM
FEED THRU
hPI I048C
Figure 5-9. 1 0 kHz Monitor Calibration.
5-43. 10 MHz Monitor Response Adjustment.
a. Connect thermal converter,
reference supply to 652A as shown in Figure 5-3, setting
652A and reference supply outputs to minimum before
connecting.
Do not exceed rated input of thermal con­
verter. A n y overload or high voltage transient
may destroy thermaelement.
b. Set 652A controls as follows:
FREQUENCY RANGE . . . . . . . . . . . . . Xl OK
FREQUENCY dial .
. . . . . . . . . . _
ATTENuATOR . . . . . . . . . . . . . . . . . .
OUTPUT MONITOR . . . . . . . . . . . . NORMAL
c.
Adjust OUTPUT AMPLITUDE AND VERNIER con­
trols for a 652A monitor indication of 3.0 V.
d. Adjust reference supply for a null indication. Do not
readjust reference supply once null is obtained.
e. Set 652A OUTPUT MONITOR to EXPAND, and use
REF SET controls to set a zero reference
expanded monitor scale.
f. Set 652A FREQUENCY RANGE to X l M, and set
FREQUENCY dial to l O .
g . Adjust 652A OUTPUT AMPLITUDE and VERNIER
controls f0f a null indication on null meter.
Adjust A3C I I until 652A monitor indicates zero
h.
reference set in Step e.
i. Repeat Steps c through h until no further adjustment
is needed.
j. Set 652A FREQUENCY dial to l , and adjust 652A
AMPLITUDE controls for a null indication on null meter.
AC-DC DIFFERENTIAL
VOLTMETER/DC STANDARD
@
®
@ @ @ @ @ @ ® ®
V
�ctlon
de null meter, and
. . . . . . . . I
3.0 V
on 652A
hp 741B
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0
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