Instruction manual

HB 01-26-09 Oscilloscope (1) Lab 5 7
12. VERTICAL MODE switch. Set to CH1 (channel 1 or X input).
13. CH1 AC-GND-DC switch. Set this switch at AC. This puts a blocking capacitor in the
input to the scope, suitable for AC signals. If in the future you wish to look at DC signals,
choose DC. The GND position disconnects the input signal and grounds the scope input.
This is very useful if you want to know what vertical position of the trace corresponds to
zero volts.
14. CH1 INPUT JACK. Connect the signal you wish to examine to this jack. The jack is a
female Baby Type N connector, or BNC connector.
15. CH1 VOLTS/DIV control. This is the vertical sensitivity control for channel 1 and
determines the amount of amplification applied to the input signal before the input signal is
connected to the vertical deflection plates. It is the larger of two knobs that are concentric.
(The smaller knob is control 16.) The setting of this knob gives the vertical deflection of
the trace for a particular input signal if the CH1 VARIABLE/PULL control (control 16) is
fully clockwise in the CAL position and is in the “IN” position. For example, if this control
is set at 50 mV, a 100 mV input signal will produce a 2 cm vertical deflection of the trace
if control 16 is “IN” and fully clockwise in the CAL position. Set at 1 V.
16. CH1 VARIABLE/PULL control. This is a variable vertical sensitivity control for chan-
nel 1. It should be fully clockwise in the CAL position if you wish to use the markings for
control 15. This control can also be pulled out to increase the vertical sensitivity by a factor
of 5. For now, be sure the knob is in and fully clockwise in the CAL position.
17. CH1 POSITION control. Moves the trace vertically. Set the pointer up. This knob can
also be pulled out. Be sure that it is in.
18. CH2 POSITION control. Adjusts the vertical position of the channel 2 trace if there is
one. CH2 is not used in this lab.
19. CH2 VOLTS/DIV control. Adjusts the vertical sensitivity for channel 2 in fixed amounts.
20. CH2 VARIABLE/PULL control. Adjusts the vertically sensitivity of channel 2 contin-
uously.
21. CH2 INPUT JACK. Not needed in this lab.
22. CH2 AC-GND-DC switch. Not needed in this lab, but set at GND.
23. Horizontal TIME/DIV control. Adjusts the rate, in discreet steps, at which the electron
beam is swept across the screen. For the numbers to be valid, control 26 (VAR SWEEP)
must be in the CAL position. For example, if this control is set a 5 ms, the horizontal sweep
voltage will move the electron beam across the screen a distance of 1 cm in 5 ms if control
26 is in the CAL position (fully CW). Set this control for 1 ms.
26. VARIABLE SWEEP control. Provides for variable adjustment of horizontal sweep rate.