Specifications

Operating Manual SEFRAM 4451
M4451 A00
15
2.6 Grounding Requirements
To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. This
instrument is grounded through the ground conductor of the supplied, three-conductor ac power cable. The
power cable must be plugged into an approved three-conductor electrical outlet.
WARNING:
Do not alter the ground connection. Without the protective ground connection, all
accessible conductive parts (including control knobs) can render an electric
shock. The power jack and mating plug of the power cable meet IEC safety
standards.
2.7 Signal Connections
The BNC connectors are:
OUTPUT - Up to 10V peak-to-peak into 50 ohm impedance (20V p-p into open circuit). The instrument
is protected from short circuit to ground.
TRIG IN - 10 KΩ impedance, selectable positive or negative slope, variable level from -10V to +10V.
Input protected to ±15V.
SYNC OUT - A positive pulse signal in phase with the main output. TTL levels with a 50 ohm source
impedance and with 3.5ns typical transition times.
2.7.1 Maintaining Pulse Fidelity
Due to the extremely fast pulse rise times obtained from the instrument, special consideration must be given
to preservation of pulse fidelity. Even at low repetition rates, high frequency components are present in the
output waveform. Use high quality coaxial cables, attenuators and terminations.
RG 58 type coaxial cable and typical BNC connectors exhibit impedance tolerances which may cause visible
reflections. For maximum fidelity, use short, high quality, 50 ohm coaxial cables.
When signal comparison measurements or time difference determinations are made, the two signals from the
test device should travel through coaxial cables with identical loss and time delay characteristics.
When making connections that are not in a 50 ohm environment, keep all lead lengths short, 1/4 inch or less.