CATV Measurements
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2715 User Manual
9. Press [3] to print results of the last measurement performed. A printer must
be connected to the 2715.
NOTE
. You can print measurement results only when the RS-232 interface is
installed in the 2715. The GPIB interface does not support the print function.
Be sure to select handshaking ([UTIL] [4] [0] [2] [5]) to match that expected by
the printer or long jobs may not print completely.
10. Press [4] to print all stored results of the measurement. A printer must be
connected to the 2715.
11. Press [9] to leave the Carrier Survey measurement and return to the CATV
MEASUREMENTS menu.
MODULATION DEPTH Measurement
The MODULATION DEPTH measurement records and displays the depth of
modulation for the current channel. Test results can be displayed and stored.
Stored or current results can be printed if you have an RS-232 interface installed
in the 2715 You make selections and run the modulation depth test using the
CATV MEASUREMENTS submenu, MODULATION DEPTH, which provides
the following choices:
0
RUN MODULATION DEPTH
1
STORE CURRENT RESULTS
2
DISPLAY RESULTS
3
PRINT CURRENT RESULTS (RS-232 Only)
4
PRINT STORED RESULTS (RS-232 Only)
5
SET UP ADJUSTMENT MODE
6
ENTER ADJUSTMENT MODE
9
LEAVE MODULATION DEPTH
When you initiate the MODULATION DEPTH measurement, the 2715 performs
the following:
1. Tunes to the carrier frequency, finds the peak value, and moves the signal to
top of screen. The 2715 then enables zero span, linear vertical scale, and
1 MHz RBW filter.
2. If VITS is present in the selected channel table data for this channel, the
2715 uses the VITS line to determine depth of modulation. (The VITS line
must include a 100% white signal for this method to work.) In this case, the
sweep time is set to 100
µ
s/div and the trigger mode to TV line trigger.
The VITS line is defined in the channel table using the IBM-compatible PC
software.
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Страница 25: ...Getting Started ...
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