HP 3336A - Page 135

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Model 3336A/B/C
SECTION V
ADJUSTMENTS
5-1. INTRODUCTION.
5-2. This section contains adjustment procedures required to make the -hp- 3336 meet its
specifications listed in Table 4-1. These adjustments should be performed after repair and
when the performance tests indicate a deficiency. To identify and locate the individual printed
circuit assemblies inside the -hp-3336, refer to Figure 5-2 on page 5-13/14.
5-3. The equipment required to adjust the -hp- 3336 is listed in each adjustment procedure
and in Table 4-2. Table 4-2 also gives the critical specifications for each piece of equipment.
Other test equipment may be substituted if it meets or exceeds these critical specifications;
however, the adjustment procedure may have to be modified slightly to account for the new
equipment. For this reason, the adjustment procedures are in general terms and in some
cases a discussion of the measurement technique is included.
5-4. If a series of adjustments must be performed, the order that they should be performed
in is the order they are given in this section. An adjustment may affect one or more of the
adjustments that follow it but should not affect those that precede it. It is recommended that
a 30 minute warm-up precede any adjustment unless otherwise noted.
Adjustment Paragraph
Power Supply Voltage 5-5
30 MHz Reference Oscillator Frequency 5-7
Option 004, High Stability Frequency Reference 5-9
VCO Range 5-11
API Current Sources 5-13
API Spur 5-15
Multiplier Input and Output Offset ~ §-17
2:1 Mixer Spur 5-19
—10.2 Vdc Reference Voltage 5-21
DAC Offset Voltage 5-23
Leveling Loop Amplifier Zero 5-25
Leveling Loop Bias 5-27
75 ohm Level Accuracy 5-29
Output Amplifier Flatness 5-31
124/135/150/600 ohm Level Accuracy 5-33
X Drive Final Voltage 5-35
5-5. Power Supply Voltage Adjustment.
5-6. This adjustment sets all three supply voltages within the operating tolerances of the
AC power line voltage is present at the rear panel and on the power
supply printed circuit board (A2). When the front panel power
switch is in the STBY (standby) position, line voltage is still ap-
plied to the instrument.
Adjustments
5-1