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Signal Generator Overview
Front Panel
12. EXT 2 INPUT
This female BNC input connector (E8257C and E8267C only) accepts a 1V
signal for AM, FM, and M.
p
With AM, FM, or M, 1 V
produces the indicated deviation or depth. When ac-coupled inputs are
p
selected for AM, FM, or M and the peak input voltage differs from 1V
by more than 3%, the HI/LO
p
annunciators light on the display. The input impedance is selectable as either 50 or 600 and damage
levels are 5 V
and 10 V
. On signal generators with Option 1EM, this input is relocated to the rear panel.
rms
p
13. LF OUTPUT
This female BNC output connector (E8257C and E8267C only) outputs modulation signals generated by the
low frequency (LF) source function generator. This output is capable of driving 3V
(nominal) into a 50
p
load. On signal generators with Option 1EM, this output is relocated to the rear panel.
14. Mod On/Off
This hardkey (E8257C and E8267C only) enables or disables all active modulation formats (AM, FM, M,
Pulse, or I/Q) applied to the output carrier signal available through the RF Output connector. This hardkey
does not set up or activate an AM, FM, M, Pulse, or I/Q format; each modulation format must still be set
AM > AM On
Mod
up and activated (for example,
) or nothing is applied to the output carrier signal when the
On/Off
hardkey is enabled. The MOD ON/OFF annunciator, which is always present on the display, indicates
Mod On/Off
whether active modulation formats have been enabled or disabled with the
hardkey.
15. ALC INPUT
This female BNC input connector is used for negative external detector leveling. This connector accepts an
input of 0.2 mV to 0.5V. The nominal input impedance is 120 k and the damage level is 15V. On signal
generators with Option 1EM, this input is relocated to the rear panel.
16. RF On/Off
Pressing this hardkey toggles the operating state of the RF signal present at the RF OUTPUT connector.
Although you can set up and enable various frequency, power, and modulation states, the RF and microwave
RF On/Off
output signal is not present at the RF OUTPUT until
is set to On. 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 alternate between a positive and a negative
value. When specifying a negative numeric value, the negative sign must be entered prior to entering the
numeric value.
Chapter 1
9
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