10
Getting familiar with Data Keypad
Operation of the data keypad is conventional. The data keypads of
the 8201A Modulation Analyzer are described as below:
Figure-5: Data Keypad of 8201A Modulation Analyzer
MHz key
Select the carrier FREQ function and depress the [8] key. The carrier
frequency display will indicate ‘8 and the unit’s legend will go out.
The tick mark (‘) indicates that the number displayed has not yet
been entered.
Continue by depressing the [2], [.], [1] and [5] keys and the MHz
key to enter the number. The display will now indicate 82.15000
MHz. (Note: It is not necessary to enter any trailing zeroes, nor is it
necessary to depress the ENTER key if a units key is used. While this
is the most efficient way to enter 82.15 MHz, it is equally valid to
enter 82150 kHz, 82150000 Hz, etc).
DEL and CLR Key
If at any time before entry the wrong digit is entered, depress the
DEL key to clear the digit, or depress the CLR key to clear all input and
restore the previous frequency display.
Getting familiar with Function Keys
The function keys of 8201A modulation analyzer are described as
below:
The top row of illuminated switches are the function keys. These
keys are used to select the parameter to be displayed and to enable
the data keypad for subsequent data entry. The functions are carrier
FREQ, carrier LEVEL, audio SINAD, audio FREQ, audio DIST, AM, FM, PM,
SPCL, and PRGM. The LED in the switch of the selected function will
be illuminated continuously; the others will be off unless a measure-
ment of that function is in progress. In this case the LED will flash
during the measurement interval.
FREQ function key
To select a function press the desired function key. The units legends
associated with that function will appear immediately to the right of
the numeric display.
For example, select the carrier FREQ function and press the 1 and V/
GHZ keys. The display will now contain the number 1000.0000 and
the active legend will be MHz
FM function key
Depress the FM function key. The LED in the carrier FREQ key will go
out, and the LED is the FM key will illuminate. Depress the 1, 0, and
kHz keys. The number 10.00 will now be displayed in the modulation
display.
All other function keys operate in the same manner, except that data
cannot be entered when the DIST or SINAD functions are selected.
Figure-4: Function Keys of 8201A Modulation Analyzer
