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Mode! 8012A
Section-
Table 1—1. Specifications.
PULSE CHARACTERISTICS
(500 source and load impedance)
Transition Times:
5nS - 0.5S in four ranges. Ranges are common for rise
and fall times but independent verniers provide separate
control of rise and fall time within each range upto
maximum ratios of 100:1 or 1:100,
Linearity:
For transition times > 30nS maximum deviation from a
straight line between the 10% and 90% points is less than
5% of pulse amplitude.
Overshoot and Ringing:
< ± 5% of pulse amplitude.
Preshoot:
< ± 5% of pulse amplitude.
Pulse Width:
<
IQnS
to
IS
in
four ranges.
Vernier provides
continuous adjustment between ranges.
Width Jitter:
< 0.1% + 50pS on any width setting.
Maximum Duty Cycle:
> 75% from 1Hz to 10MHz, decreasing to > 40% at
50MHz.
Maximum Output:
5V across 5012, (10V across open ciruit). Output circuit
protected, cannot be damaged by shorting.
Attenuator:
Four-step attenuator provides the ranges: 0.2 — 0.5V,
0.5 — IV, 1 —2V and 2 — 5V. Vernier provides
continuous adjustment between steps.
Polarity:
Positive or negative, selectable.
Source Impedance:
5012 ± 10%, shunted by (typically) 20pF.
DC Offset:
± 2.5V across 5012 load. Independent of attenuator and
amplitude vernier settings and may be switched off.
Pulse Delay:
< 35nS to IS (with respect to trigger output) in four
ranges; vernier provides continuous adjustment between
ranges.
Delay Jitter:
< 0.1% +50pS on any delay setting.
REPETITION RATE AND TRIGGER
Repetition Rate:
1Hz
to
50MHz
in
four
ranges.
Vernier provides
continuous adjustment between ranges.
Period Jitter:
<0.1% +50pS on any repetition rate setting.
Square Wave:
0.5Hz to 25MHz in four ranges. Duty cycle 50% ±5%
upto 1MHz, tolerance increases to ± 15% at25MHz.
Trigger Output:
Amplitude: >+1V across 5012.
Width: 16nS± lOnS.
Suitable for triggering another 8012A.
EXTERNALLY CONTROLLED OPERATION
External Triggering
Repetition Rate:
0 to 50MHz. For square wave output, frequency divided
by factor 2.
Trigger input:
Sinewaves > 1.5Vpp
( zero dc )
or pulses > 0.8V,
(positive or negative) at least 7nS wide.
Delay:
25nS ± 8nS between leading edge of trigger input and
trigger output signals.
Maximum Input Amplitude:
<±7V
Input Impedance:
5012 ± 10%
Coupling:
DC-Coupled.
Manual:
Front panel push button for single pulse.
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