Calibration-PS
501
0
Internal Adjustment Procedure
INTERNAL
ADJUSTMENT
PROCEDURE
Introduction
This procedure should be performed if the instrument
fails to meet the performance requirements of the electrical
characteristics listed in the Specification section of this man-
ual. To ensure continued instrument accuracy, it is recom-
mended that adjustment be performed every 1000 hours of
operation or every
6
months if used infrequently. Adjust-
ment is also recommended following instrument repair or
modification. The adjustments must be made at an ambient
temperature of
+20°C to +30°C.
Services Available
Tektronix, Inc. provides complete instrument repair and
adjustment at local field service centers and at the factory
service center. Contact your local Tektronix field office or
representative for further information.
Test Equipment Required
The test equipment (or equivalent) listed in Table 5-1 is
required for adjustment of the PS 501 0. Specifications given
for the test equipment are the minimum necessary for accu-
rate adjustment. All test equipment is assumed to be cor-
rectly calibrated and operating within specification. If other
test equipment is substituted, the calibration may need to be
altered to meet the requirements of the equipment used.
Adjustment Access
Use two extender cables (Tektronix Part No. 067-0645-
02)
to operate the plug-in outside the power module. An
extender cable for the GPlB (Tektronix Part No. 067-0996-
00)
is also available. When connecting the plug-in to the
power module via the plug-in extenders, make certain the
top of the extender in the power module is connected to the
top of the plug-in. Remove the right side cover of the PS
5010. All adjustments are located on the right side and bot-
tom of the
PS
501 0. See Figs. 9-1 0 and 9-1 1 in the pullout
pages in the rear of this manual.
Fig. 5-6 shows adjustment interactions.
To prevent damage to the power module series pass
transistors do not operate the
PS
5070
on extender
cables at high loads for extended periods of time.
Adjust
4.5
V
Adj and Gain Adj
Connect the negative terminal of the digital voltmeter to
the ground terminal of the LOGIC output. Connect the
positive terminal to the positive terminal of the LOGIC
output.
Make certain the PS 5010 output button is illuminated
(ON).
Press the following buttons in the order listed:
SUPPLY SELECT
LOGIC
4
5
ENTER
CHECK-that the dvm reads from 4.499
V
to 4.501
V.
ADJUST-R1950, 4.5
V
Adj, for a dvm reading of
4.499
V
to 4.501
V.
Press the following buttons in the order listed:
5
ENTER
CHECK-that the display reads from 5.499
V
to
5.501
V.
ADJUST-R1851, Gain Adj, for a reading from 5.499
V
to 5.501
V.
Remove these connections for the next step.
Adjust Max
I
Adj
Make certain the OUTPUT light is
OFF
Connect the PS 501 0, dvm and 0.1
R
resistor as shown
in Fig. 5-7.
REV
AUG
1981
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