Adjustment Procedure; Preliminary Control Settings; Check The Digital Board Accuracy; Accuracy ( + 2%) - Tektronix DC 5010 Anleitung

Calibration-DC
501 0
Adjustment Procedure
PROCEDURE
Introduction
b
Use this Adjustment Procedure to restore the DC 5010
to original performance -requirements. This Adjustment Pro-
cedure need not be performed unless the instrument fails to
meet the Performance Requirements of the Electrical Char-
acteristics listed in the Specification section. If the instru-
ment has undergone repairs, the Adjustment Procedure is
recommended. Allow thirty minutes warmup time for oper-
ation to specified accuracy (sixty minutes after storage in a
high humidity environment).
Satisfactory completion of all adjustment steps in this
procedure assures that the instrument will meet the Perfor-
mance Requirements, providing the instrument is function-
ing properly.
NOTE
Make adjustments at an ambient temperature be-
tween
+
20" C and
+
30"
C.
1. Check the Digital Board
+
1 2 V Accuracy
( 2 2 % )
a. Set the digital multimeter Function-Range switch to
20 Vdc and connect the Low test lead to the DC 501 0 chas-
sis ground. Connect the VoltslQ test lead to the Digital
board
+
12 test point.
b. Check that the digital multimeter readout indicates be-
tween 1 1.40 and 12.60 (volts).
Test Equipment Required
The test equipment (or equivalent) listed in Table 4-1 is
required for adjustment of the DC 501 0. Specifications giv-
en for the test equipment are the minimum necessary for
accurate adjustment. All test equipment is assumed to be
correctly calibrated and operating within specifications.
If other test equipment is substituted, calibration setup
may need to be altered to meet the requirements of the
equipment used.
PRELIMINARY CONTROL SETTINGS
FREQ A
CHANNEL A and
CHANNEL B
ATTEN
SLOPE
COUPL
TERM
AVGS
(lighted)
X I (lighted)
+
(unlighted)
DC (unlighted)
50
Q
(lighted)
1 06
Preparation
Access to the internal adjustments is achieved most
easily when the DC 5010 is connected to the power module
with a flexible plug-in extender. Remove the top and side
covers of the DC 501 0 to reach the adjustments and checks
on the Auxiliary, Digital, and Analog boards. Refer to the
Adjustment Locations and Setups in the pullout pages at
the rear of this manual.
2. Check the Digital Board
-
12.2 V Accuracy
( & 2 % )
a. Remove the VoltslQ test lead from the
+
12 test point
and connect it to the -12 test point (Digital board).
b. Check that the digital multimeter readout indicates be-
tween
-
1 1.40 and
-
12.60 (volts).
3. Check the Digital Board + 5 V Accuracy (+2%)
a. Remove the digital multimeter VoltslQ test lead from
the -12 test point and connect it to the +5 test point (Digi-
tal board).
b. Check that the digital multimeter readout indicates be-
tween +4.90 and +5.10 (volts).
c. Remove the VoltslQ test lead from the +5 test point.
4. Check the Digital Board +2.5 V (V ref) Accuracy
(& I Yo)
a. Connect the digital multimeter VoltsIQ test lead to the
Digital board Vref test point.
b. Check that the digital multimeter readout indicates be-
tween 2.475 and 2.525 (volts).
REV JUL
1983