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Section
4 D C 501 0
CALIBRATION
Introduction
This procedure checks the electrical performance re-
quirements as listed in the Specification section in this man-
ual. Perform the Adjustment Procedure if the instrument
fails to meet these checks. In some cases, recalibration may
not correct the discrepancy; circuit troubleshooting is then
indicated. Also, use this procedure to determine acceptabil-
ity of performance in an incoming inspection facility.
Calibration Interval
To ensure instrument accuracy, check the calibration ev-
ery 2000 hours of operation or at a minimum of every six
months if used infrequently.
Service 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.
1. Check Oscillator Frequency (Standard
Timebase)
NOTE
The timebase accuracy is a function of temperature
and time. The temperature stability for the standard
time base is
_t
5 pprn (0" C to 50" C) with an aging rate
of
_t
1 ppm/year.
After one year of operation (since the time base was
calibrated), the 1 MHz frequency standard should
read 1.0000000,
6.0 pprn for any temperature be-
tween 0" C to 50" C. The
_t
6.0 pprn are determined by
_t
5 pprn due to temperature, k 1 pprn due to aging,
and
_t
1 count to synchronization error. After this
check is completed, the user should determine if a
time base recalibration is required.
a. Connect a coaxial cable from the 1 MHz frequency
standard output to the DC 5010 CHANNEL A input.
b. Press the DC 501 0 AUTO TRIG button.
Test Equipment Required
The test equipment (or equivalent) listed in Table 4-1 is
suggested to perform the Performance Check and Adjust-
ment Procedure.
PRELIMINARY CONTROL SETTINGS
FREQ A
(lighted)
CHANNEL A and
CHANNEL B
SLOPE
+
(unlighted)
ATTEN
X I (lighted)
COUPL
DC (unlighted)
TERM
1 MQ (unlighted)
c. CHECK-that
the
DC5010
readout is within
999.99399 kHz and 1 .OOOOO6l MHz
(a
6.0 ppm,
-t
1
count).
2. Check Time Base Oscillator Frequency (Option
01
1
NOTE
The temperature stability for the Option 01 time-base
is 0.2ppm (0" C to 50" C) with an aging rate of
1 ppm/year and
1 count.
a. Connect a coaxial cable from the 1 MHz frequency
standard output to the DC 5010 CHANNEL A input.
b. Press to light the DC 5010 FREQ A button, then
press the AUTO TRlG button.
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