HP Q METER 4342A Operating And Service Manual page 62

Section V
Paragraph 5-22
b.
Set 4342A controls as follows:
FREQUENCY RANGE . . . . . . . . . 22k - 70k
FREQUENCY dial . . . . . . . . . . . . . . . . 2.2
L/C dial . . . . . . . . . . . . . . . . . . . 25(pF)
AC dial . . . . . . . . . . . . . . . . . . . . . . . . -5
C.
Set the Test Oscillator frequency to
1OOkHz and adjust the signal level
until the Digital Voltmeter reads
9OO.OmV.
d. Adjust A6R2 (Xl GAIN adj.) for full
scale Q meter reading.
e. Adjust the Test Oscillator's signal
level until the DVM reads 450.0mV.
f. Q meter should indicate exactly l/2
full scale. If Q meter deflection is
insufficient, rotate ASR43 (LINEARITY
ADJ) CCW until meter reads correctly.
If deflection is excessive, rotate AS-
R43 slightly CW.
g-
Repeat steps c through f until meter
indicates l/2 full scale within
+O.S/lOO full scale (l/2 minor divi-
sion) in step f.
h.
Adjust the Test Oscillator's signal
level until the DVM reads 300.0mV.
1.
Q meter should indicate within l/3
full scale ?l/lOO of full scale (1
minor division).
If not, repeat steps
c through f.
Model 4342A
2) X10 GAIN adjustment.
j.
Adjust the Test Oscillator's signal
level until the DVM reads 810.0mV.
k.
Depress 4342A AQ button and set
AQ
RANGE to 10.
1.
Adjust AQ ZERO control for 10 (zero
scale deflection) on AQ scale.
m. Adjust the Test Oscillator's signal
level until the DVM reads 900.0mV.
n.
Q meter should indicate 0 (full scale)
on AQ scale.
If Q meter reading is
not zero, adjust A6R21 (X10 GAIN adj.)
for correct reading.
Repeat steps j
through n because both adjustments
interact.
5-22.
Q ANALOG OUTPUT
ADJUSTMENT.
A Test Oscillator and a Digital Voltmeter are
required for this adjustment.
a.
Set 4342A controls as follows:
Q RANGE . . . . . . . . . . . . . . . . . . . . . . . . 30
other controls . . . . . . . any settings
b.
Connect Digital Voltmeter to 4342A
rear panel Q ANALOG OUTPUT connector.
C.
Adjust A6R4 (REC BAL adj.) for OV
?O.OlV on Digital Voltmeter display.
TEST OSCILLATOR
1
4342A
l-y
DIGITAL VOLTMETER
S-10
Figure 5-6.
Voltmeter Adjustment.