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Figure 5-51.
A2 Control Board Calibration Potentiometers
5-121
CALIBRATION
5-122
Calibration procedures for the 6034A are of two
types, routine and service. Routine calibration consists of
those procedures which can be done at the front calibration
panel without removing the instrument from the rack. Routine
calibration can be done whenever it is desired to check the
unit's calibration. No routine calibration interval is recom¬
mended. Service calibration consists of all the routine calibra¬
tion procedures plus procedures that can only be done by
removing the top cover of the instrument. The complete ser¬
vice calibration should be done, in the order presented, after
any repair. Procedures that are to be done only for service
calibration are noted in the following paragraphs.
5-123
Initial Setup
a.
Use 1/16" hex wrench to loosen two setscrews in
OUTPUT ADJUST knob, remove knob.
b.
To gain access to calibration panel, loosen two
screws that secure front panel to instrument.
c.
Turn OVP ADJUST control (A3R43) fully clockwise.
d.
Strap unit for local sensing (rear panel + S to +, - S
to -).
e.
Disconnect all loads from output terminals.
f.
Connect an HP-IB controller (HP9825 or HP85
recommended) to the 6034A.
g.
Turn on ac power.
h.
Allow unit to warm up for 30 minutes.
i.
To perform service calibration, remove top cover of
instrument.
j.
Figure 5-51 shows the location of potentiometers
used for service calibration on the A2 control board.
k.
To allow easy connection of test probes to control
board test points, remove control board top support
bracket, and plug test connector HP part no.
1251-6016 onto control board.
l.
Turn off ac power when making or removing con¬
nections to 6034A.
Procedures described herein are performed with
power supplied to the instrument, and protective
covers removed. Such procedures should be per¬
formed only by service-trained personnel who-are
aware of the hazards involved (for example, fire
and electrical shock). Where procedures can be
performed without power applied, the power
should be removed.
5-124
Remote OVP Calibration
a.
Ensure that front-panel OVP ADJUST control
(A3R43) is turned fully clockwise.
b.
Connect DVM between test points TP6 and OBS on
front-panel assembly.
c.
Adjust A3R42 (OVP FULL SCALE) for +6.45 V
±0.02 V.
5-125
Ip Limit Calibration
5-126
Ip limit calibration should be performed only during
complete service calibration.
a.
Connect test setup as shown in Figure 5-2. Open
switch SI. The load resistor should be set for less
than 10.
5-68
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