Signal Generator Overview
Front Panel
Chapter 18
12. EXT 2 INPUT (PSG-A only)
This BNC input connector accepts a
±
1 V
p
signal for AM, FM,
Φ
M, and pulse modulation.
With AM, FM, or
Φ
M,
±
1V
p
produces the indicated deviation or depth. With pulse
modulation,
+
1 V is on and 0 V is off.
When ac-coupled inputs are selected for AM, FM, or
Φ
M and the peak input voltage differs
from 1 V
p
by more than 3%, the HI/LO annunciators light on the display. The input
impedance is selectable as either 50
Ω
or 600
Ω
and damage levels are 5 V
rms
and 10 V
p
.
13. LF OUTPUT (PSG-A only)
This BNC connector is the output for modulation signals generated by the low frequency (LF)
source function generator. This output is capable of driving 3 V
p
(nominal) into a 50
Ω
load.
14. Mod On/Off Key (PSG-A only)
This hardkey toggles the operating state of all modulation signals. Although you can set up
and enable various modulation states, the RF carrier is not modulated until
Mod On/Off is set
to On. An annunciator is always present in the display to indicate whether modulation is
turned on or off.
15. ALC INPUT
This connector is used for negative external detector leveling. This connector accepts an input
of
−
0.2 mV to
−
0.5 V. The nominal input impedance is 120 k
Ω
and the damage level is
±
15 V.
16. RF On/Off Key
This hardkey toggles the operating state of the RF signal present at the RF OUTPUT
connector. An annunciator is always visible in the display to indicate whether the RF is
turned on or off.
17. Numeric Keypad
The numeric keypad consists of the 0 through 9 hardkeys, a decimal point hardkey, and a
backspace hardkey ( ). The backspace hardkey enables you to backspace or specify a
negative value. When specifying a negative numeric value, the negative sign must be entered
prior to entering the numeric value.
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