Reference
Bottom Side Description
Ch1, Ch2 (Ch3,
Ch4)
Sets the trigger source to a specific channel.
AC Line Sets the trigger source to use the AC line
signal (not a
vailable when operating w ith
batteries).
Ext
Ext/10
Sets the oscilloscope to trigger on the
external trigger source. E xt/10 attenuates
the externa
l trigger signal by a factor of 10.
(See page 96.)
Ext Probe n
nX
Voltage / Current
(4-channel only)
Set this value to match the attenuation factor
and the type of probe (voltage or current) that
is attach
ed to the external trigger connector.
Push the menu button to select the probe
type. Use the general purpose knob to set
the atten
uation factor. The default v alues
are 1x and voltage.
Vert
Sets the trigger source to the
lowest-numbered active channel in
the dis
play.
Source
Altern
ating (all
active channels)
Sequen
tially uses each active channel as a
trigger source, from the lowest-numbered
active channel to the highest-numbered
activ
e channel. (See page 96.)
DC Selec
ts DC coupling.
HF Reject
Reje
cts frequencies above 30 kHz in the
trigger signal.
LF Re
ject
Rejects frequencies below 1 kHz in the
trigger signal.
Coupl
ing
Noise Reject
DC coupling with low sensitivity to reject
no
ise in the trigger signal.
/(
rising edge)
Tr
iggers on the rising edge of a signal.
Sl
ope
\
(falling edge)
T
riggers on the falling edge of a s ignal.
Level Use to set the trigger level with the general
p
urpose knob.
Set to TTL Sets the trigger level to +1.4 V for TTL logic.
Set to ECL Sets the trigger level to -1.3 V for ECL logic
(V
ee
=-5.2V).
Level
Set to 50% Sets the trigger level to the 50% amplitude
level of the signal.
TDS3000C Series Oscilloscope User Manual 95
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