Chapter 2 Operating Your Frequency Counter
Using CHANNEL 1 Input Conditioning Keys
Operating Guide 2-41
2
Using CHANNEL 1 Input Conditioning Keys
The Trigger/Sensitivity keys are menu keys, while the other keys in this group (that
is, 50Ω/1MΩ, DC/AC, X10 Attenuate, and 100kHz Filter) are toggle keys.
Use the CHANNEL 1 group of keys to set up the Counter’s input conditions for
measuring input signals applied to CHANNEL 1. (The Trigger/Sensitivity menu is
unavailable for Voltage Peaks measurements.)
Overview of Trigger/Sensitivity Menu
NOTE Most of the measurement functions (that is, frequency, period, and ratio)
automatically set the auto trigger mode and trigger level. The Trigger/Sensitivity
menu items allow you to override the automatic settings.
The menu items under the Trigger/Sensitivity key allows you to manually:
• select the auto trigger mode (AUTO TRIG: ON or OFF).
If auto trigger is OFF, you are allowed to:
• select the voltage level at which CHANNEL 1 will trigger
(LEVEL: n V, where n is a numeric value).
If auto trigger is ON, you are allowed to:
• select the percentage of an input signal at which the Counter will trigger
(LEVEL: n PCT, where n is a numeric value).
Setting AUTO TRIG: to ON causes the Counter to measure and compute a trigger
level corresponding to the auto-trigger percentage of CHANNEL 1.
NOTE The optional Channel 2 RF Input (Option 015, 030, or 050) requires no manual input
conditioning. Just connect the RF signal to CHANNEL 2 and the Counter measures
the signal.
CHANNEL 1
Trigger
Sensitivity
DC
AC
50Ω
1M Ω
X10
Attenuate
100kHz
Filter
Damage Lvl:
5V rms MAX. 50Ω
!
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