IFR FM/AM-1200A

4-8-1 GENERAL
Table 4-9 lists the front panel controls which are used in the Oscillo-
scope function of the FM/AM-1200S/A. For oscilloscope operation, the
HORIZONTAL Sweep Selector Control (26) must be in "mS/Div" or "11S!DIV"
position. The VERTICAL Attenuator Selector Control (24) "kHz/%X10"
position is for internal demodulated audio and ''V/Div'' position is for
external scope inputs. All other controls are similar to those found on
most conventional oscilloscopes.
4-8-2 EXTERNAL OSCILLOSCOPE OPERATION
The FM/AM-1200S/A Oscilloscope is a general purpose DC to 1 MHz band-
width single trace oscilloscope with automatic triggering. Any external
input to the scope must be applied at the front panel SCOPE/DVM
Connector (20).
STEP PROCEDURE
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1. Place the FM/AM-1200S/A front panel controls to the settings
listed in Table 4-9.
2. Connect TONE OUT Connector (17) to SCOPE/DVM Connector (20).
3. Turn 1 kHz TONE Selector Switch (7) to "INTL'' position.
4. Adjust 1 kHz TONE LEVEL Control (8) for a viewed sine wave on
CRT Display (31).
[NOTE\
When AC/GND/DC Switch (21) is in ''GND''
position, the external input is removed from
the Oscilloscope.
4-8-3 INTERNAL OSCILLOSCOPE OPERATION
The VERTICAL Attenuator Selector Control (24) must be in one of the four
"kHz/%X10'' positions for internal oscilloscope operation.
STI~------------------------------~~Q~IQ~~I ____________________________ _
1. Place the FM/AM-1200S/A front panel controls to the settings
listed in Table 4-9.
2. Set Vertical Attenuator Selector Control (241 to "2 kHz/%X10"
position.
3. Set FM/AM-1200S/A controls for 5 kHz FM deviation. (Ref.
paragraph 4-6, RF Signal Generation Operation (Simplex).)
4. The CRT now displays (+) and (-) 5 kHz deviation.
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