Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Performance Check
25. Check Vertical Output (provides 0.5 V ± 5% of
signal per division of display from the centerline)
a. Connect the VERT OUTPUT to the input of a de
coupled test oscilloscope with a sensitivity of 1 V/DIV and
sweep rate of 1 0 ms.
b. Set the 492/492P controls as follows:
FREQUENCY 100 MHz
Triggering FREE RUN
TIME/DIV AUTO
Vertical Display 2 dB/DIV
RESOLUTION BANDWIDTH 100 kHz
FREQ SPAN/DIV 100 kHz
REF LEVEL -2 0 dBm
Digital Storage (Option 02) Off
c. Apply the CAL OUT signal to the RF INPUT and tune
the 100 MHz signal to center screen.
Fig. 3-21. Display of a full screen signal at the Vertical Output
connector.
d. Activate the FINE step REF LEVEL function and ad
just the REF LEVEL for an eight division display.
e. Check the vertical signal output level on the test oscil
loscope. Output level should equal plus and minus 2 V for a
total of 4 V ±0.2 V (see Fig. 3-21).
26. Check Horizontal Signal Output (0.5 V ±5%
either side of center screen with a full range of —2.5 V
to +2.5 V ±10%)
a. Connect a dc-coupled test oscilloscope to the HORIZ
OUTPUT connector. Set the 492/492P TIME/DIV to MNL
position.
b. Adjust the crt beam five divisions either side of center
screen with the MANUAL SCAN control. The output range
should equal -2.5 V to +2.5 V, ±10%.
c. Return the TIME/DIV to AUTO; disconnect and re
move the test equipment.
27. 492P GPIB Verification Program
This verification program for TEKTRONIX 4050-Series
Computer Terminal checks functional operation of the GPIB
interface in a 492P Spectrum Analyzer. All interface lines
are verified as well as all interface messages, except those
for parallel poll. In addition, the instruments’ interface is
checked for operation on other primary addresses, as well
as the talk-only and listen-only modes.
The program is written in TEKTRONIX 4050 BASIC, and
is divided into individual tests, each for a specific interface
line, message, or function. The tests start on even 1000 line
numbers to allow easy modification of the program.
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