Front Panel
4?
9. COUPLING (Channel 2)
AC — Capacitively couples the signal input. Blocks DC to 10 Hz signals,
GND (Ground) — Decouples the signal input and connects the vertical
system to ground reference.
DC — Passes all signal components to the vertical and acquisition systems.
10. Input Connection (Channel 2)
Provides the Channel 2 signal input connection for probes or coaxial cables.
11. GND Connection
The “Banana” jack receptacle provides a connection to the instrument
ground.
12. Input Connection (Channel 1)
Provides the Channel 1 signal input connection for probes or coaxial cables.
13. COUPLING (Channel 1)
AC — Capacitively couples the signal input. Blocks DC to 10 Hz signals.
GND (Ground) — Decouples the signal input and connects the vertical
system to ground reference.
DC — Passes all signal components to the vertical and acquisition systems.
14. VOLTS/D1V (Channel 1)
(Volts per division) — Selects the vertical scale factor for Channel 1. Also
vertically expands or compresses Channel 1 saved waveforms.
15. CAL (Channel 1)
(Calibrated) — The clockwise position provides calibrated volts/division
settings. Rotating the control counterclockwise variably increases the attenu
ation of the settings, thereby reducing signal amplitude. (Variable settings
are not calibrated.)
16. C H I BOTH CH 2
Selects either a single-channel display or a two-channel display:
C H I — Displays Channel 1 only.
BOTH — Activates the ADD ALT CHOP switch for two-channel displays.
CH 2 — Displays Channel 2 oniy.
17. PRB ADJ
(Probe Adjust) — Provides a 0.5 V square wave signal to compensate XI0
probes.
1
2221A User Manual
2-13
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