Adjustments; Introduction; Equipment Required; Adjustment Locations - HP 5384A Operating And Service Manual

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HP 5384A and HP 5385A
Adjustments
SECTION V
ADJUSTMENTS
5-1. INTRODUCTION
5-2. This section describes the adjustments required
to maintain the HP 5384A/HP 5385A operating char-
acteristics within specifications. Adjustments should
be made when required, such as after a performance
test failure or when components are replaced that
may affect an adjustment.
5-3. Table 5-1 lists the adjustment procedures, in the
recommended order of performance, and indicates
the adjustable components involved.
5-4. EQUIPMENT REQUIRED
5-5. The test equipment required for the adjustment
procedures is listed in Table 1-4, Recommended Test
Equipment. Substitute instruments may be used if
they meet the critical specifications.
5-6. ADJUSTMENT LOCATIONS
5-7. Adjustment locations are identified in the
procedure for each adjustment.
5-8. SAFETY CONSIDERATIONS
5-9. This section contains warnings that must be
followed for your protection and to avoid damage to
the instrument.
WARNING
I
MAINTENANCE DESCRIBED HEREIN IS PER-
FORMED WITH POWER SUPPLIED TO THE
INSTRUMENT AND PROTECTIVE COVERS RE-
MOVED. SUCH MAINTENANCE SHOULD BE
PERFORMED ONLY BY SERVICE-TRAINED
PERSONNEL WHO ARE AWARE OF THE
HAZARDS INVOLVED (FOR EXAMPLE, FIRE
AND ELECTRICAL SHOCK), WHERE MAIN-
TENANCE CAN BE PERFORMED WITHOUT
POWER APPLIED, SHOULD BE REMOVED.
BEFORE ANY REPAIR IS COMPLETED, ENSURE
THAT ALL SAFETY FEATURES ARE INTACT AND
FUNCTIONING, AND THAT ALL NECESSARY
PARTS ARE CONNECTED TO THEIR PRO-
TECTIVE GROUNDING MEANS.
Table 5-1. Adjustments
ASSEMBLY ADJUSTMENT
COMMENTS
A1 Motherboard
A1R77 HP 5384A/HP 5385A
+3 Vdc Adjustment
A 1 Motherboard
A1R43 HP 5384A/HP 5385A
Channel A
Input Amplifier
Adjustment
A 1 Motherboard A1R32
HP 5384A Channel B
Input Amplifier
Adjustment
A 1 Motherboard A1R34 HP 5385A Channel B
Input Amplifier
Adjustment
A 1 Motherboard A1C65 Standard Oscillator
A1C66
Adjustment
A 1 Motherboard Y1B 2 TCXO Oscillator
Adjustment
A 1 Motherboard Y1A Oven Oscillator
Adjustment
A3 Battery Chg A3R26 Fast Charge
Threshold
Adjustment
A3 Battery Chg
A3R25 Fast Charge
Current Adjustment
5-10. HP 5384A/HP 5385AADJUSTMENT
PROCEDURES
5-11. HP 5384A/HP 5385A +3 Volt de Adjustment
Procedure
5-12. The only voltage supply in the HP 5384A and
HP 5385A that requires adjustment is the +3 Volts. To
perform this adjustment, proceed as follows:
a. Switch the counter from STBY to ON.
b. Connect the positive terminal of the DVM to
TP1 and the negative terminal to chassis ground at the
ac input power connector in the rear of the counter.
c. Adjust A1R77 for a DVM reading of 3.00 Volts,
±30 mV ..
d. Switch the counter from ON to STBY. Discon-
nect the test equipment.
5-1