BNC 555 Series, User Manual, Page: 45 / 47

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CUSTOM FEATURES
35 Volt Option
For units with the optional 35 volt output, additional BNC connectors are provided on the rear
panel. The 35 volt output can be enabled independently for each of the channels from the
channel output mode menu. When enabled, the rear panel outputs will provide an adjustable
output from 2 volts to 38 volts and the timing will be calibrated to all other channels. The front
panel output will be in the TTL/CMOS mode. The 35 volt output provides a fast, controlled
rising edge. However, pulsewidth and falling edge are not tightly controlled. The front output
remains calibrated. The pulsewidth can be set over the standard range of the unit to allow full
use of the front panel outputs, but the 35 volt output will self limit to approximately 4 ns with
some droop. To maintain the highest possible rise time, care must be taken with cabling and
termination. Low capacitance cable and 50 ohm termination will provide the fastest rise times
without overshoot. Faster rise times can be achieved by increasing the termination resistance,
but some overshoot is likely to occur.
Keyword Parameter
Std/
N e w
Comments
:MODe
TTL /
ADJustable / 35 V
New
Selects output mode: TTL/CMOS, Adjustable or
35 Volt.
:AMPLitude <numeric value> New
Sets Adjustable output level. Note that 35 V option
AMPLitude can only be set when channel is in 35 V
mode.
35 Volt Specifications (@ 35 volts 1 ns unless otherwise specified)
• Output into 50 ohms 2 - 35 volts
• Risetime <10 ns
• Falltime 100 ns nominal
• Pulsewidth Accuracy 200 ns nominal
• Delay Offset Error
<10 ns
• Delay Jitter <2 ns
• Pulsewidth 1 - 4 ns (width can be set longer with significant droop)
• Pulse Period single shot - .001 s (1 KHz)
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