SECTION 5
MANUAL OPERATION
5.1
Front-Pmlel Controls
5.1.1 Vertical
Input Connectors (21) - BNC type connectors are used for both CHAN
and CHAN 2 signal inputs as well as the external trigger connector.
The maximum permissible input voltage is 250 V (DC + peak AC).
Signal Coupling and Input Impedance (22) - Selects the method used
couple a signal to the vertical amplifier input.
Possible selections: AC, GND, or DC with I M~ impedance
DC with 50 ~ impedance
In the AC position, signals are coupled capacitively, thus blocking the
input signal’s DC component and limiting the lower signal frequencies
to < i0 Hz.
In the DC position, all signal frequency components are allowed to pass
through, and the input impedance may be chosen to be I M~ or 50 ~. The
user should note that with I M~ input impedance the bandwidth is
limited to I00 MHz. The maximum dissipation into 50 ~ is 0.5 W, and
signals will automatically be disconnected whenever this occurs. A
warning LED (OVERLD) lights when an overload condition is detected. The
input coupling LED (22) is simultaneously switched to GND. The overload
condition is reset by removing the signal from the input and selecting
a 50 ~ input impedance again.
VOLTS/DIV (27) - Selects the vertical sensitivity factor in a 1-2-5
sequence. The sensitivity range is from 5 mV to 5 V/div at I M~ input
impedance and from 5 mV to I V/div at 50 ~ impedance (when the VAR
vernier (28) is in the detent position, i.e. turned fully clockwise).
5-1
Manual Operation
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