Initial Setup - HP 6033A series Service Manual

Printed Circuit
Board
A8 HP-IB Board Voltage DAC
A8 HP-IB Board Current DAC
A8 HP-IB Board

Initial Setup

a. Unplug the line cable and remove the top cover by removing the three screws; the rear handle screw and the two top-
rear-corner screws. Do not remove the front handle screw as the retaining nut will fall into the unit.
b. Slide the cover to the rear.
c. Plug a control board test connector A2J3 onto the A2J3 card-edge fingers.
d. Turn OVERVOLTAGE ADJUST control A3R59 fully clockwise.
e. Disconnect all loads from output terminals.
f. Connect power supply for local sensing, and ensure that MODE switches are set as shown below.
g. Connect an HP-IB controller to the power supply.
h. Reconnect line cable and turn on ac power.
i. Allow unit to warm up for 30 minutes.
j. When attaching the DVM, the minus lead of the DVM should be connected to the first node listed, and the plus lead
should be connected to the second node listed.
k. At the beginning of each calibration procedure, the power supply should be in its power-on state (turn ac power off and
back on), with no external circuitry connected except as instructed.
l. The POWER LIMIT adjustment (A2R25) must be adjusted at least coarsely before many of the calibration procedures
can be performed. If you have no reason to suspect that the Power Limit circuit is out of adjustment, do not change its
setting. Otherwise, center A2R25 before you begin to calibrate the power supply.
m. Turn off ac power when making or removing connections to the power supply.
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Table 2-2. Guide to Recalibration After Repair (continued)
Block Name Ref. Perform These Procedures
Desig.
All Remote Readback Zero Calibration
Constant Voltage Full Scale Calibration
Voltage Monitor and Remote Readback Full
Scale Calibration
Constant Voltage Zero Calibration
All Constant Current Zero Calibration
Constant Current Full Scale Calibration
U5 Remote Readback Zero Calibration
Constant Voltage Full Scale Calibration
Voltage Monitor and Remote Readback Full
Scale Calibration
Constant Voltage Zero Calibration
Constant Current Full Scale Calibration