Tektronix CMC251, User Manual

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Getting Started
6
CMC251 User Manual
15. LOW PASS FILTER Button. Attenuates signals applied to
CHANNEL A INPUT that are above 100 kHz, preventing
high-frequency interference. Select this mode to measure signals
below 100 kHz.
16. INPUT VOLTAGE Button. Allows you to select between two
levels of input signals for the CHANNEL A INPUT. When
pushed in, the maximum allowable peak-to-peak input level is
from 3 V to 42 V (30 Vrms). When in the out position, the
maximum allowable peak-to-peak input level is from 50 mV to
5 V.
CAUTION.
To avoid the risk of fire or possible damage to the
CMC251, be sure that the equipment generating the signal is
properly grounded before you make any connections to the inputs.
17. CHANNEL A INPUT. Use this connector to measure signals with
a repetition rate from 1 Hz to 100 MHz.
Rear Panel
In addition to the line voltage selectors, power input, and fuse, there
is a BNC connector for an external control input located on the rear
panel
CAUTION.
To avoid the risk of fire or possible damage to the
CMC251, be sure the input equipment is properly grounded before
making any connections. The external input connector is grounded to
the power source ground.
The external control input (see Figure 3, item 1) provides remote
control of two instrument functions: TOTAL and PULSE modes.