4
Typical delay (HP 81110A with HP 81111A output module)
[1]
Instrument mode From To Typ. value
External width EXT. INPUT STROBE/TRIGGER OUT 8.5 ns
OUTPUT 1/OUTPUT 2 19.5 ns
All other modes EXT. INPUT/CLK INPUT STROBE/TRIGGER OUT 12.0 ns
OUTPUT 1/OUTPUT 2 26.0 ns
STROBE/TRIGGER OUT OUTPUT 1/OUTPUT 2 14.0 ns
Pattern Mode
Pattern length: 16 kbit/channel
and strobe output.
Output format: RZ (return to
zero), NRZ (non-return to zero),
DNRZ (delayed non-return to
zero).
Random pattern:
PRBS 2^n-1, n = 7,8,...,14.
Trigger Modes
Continuous: continuous pulses,
double pulses, bursts (single or
double pulses), or patterns.
External triggered: each active
input transition (rising, falling or
both) generates a single or
double pulse, burst, or pattern.
External gated: the active input
level (high or low) enables
pulses, double pulses, bursts, or
patterns. The last single/double
pulse, burst, or pattern is always
completed.
External width: the pulse shape
can be recovered. Period and
width of an external input signal
is maintained. Delay, levels, and
transitions can be set.
Manual: simulates an external
input signal.
Internal triggered: internal PLL
replaces an external trigger
source. Pulses, double pulses,
bursts, or patterns can be set.
Inputs and Outputs
Clock input/PLL reference and
external input
PLL reference: (BNC connector
at rear panel). The internal PLL is
locked to an external 5 MHz or
10 MHz reference frequency.
Clock input: (BNC connector at
rear panel). The output period is
determined by the signal at CLK
input.
Ext. input: used for trigger, gate
or external width.
Input impedance: 50 Ω/10 kΩ
selectable.
Threshold: -10 V to +10 V.
Max. input voltage: ± 15 Vpp.
Sensitivity: ≤ 300 mVpp
typical.
Transitions: < 100 ns.
Frequency: dc to max. frequency
of output module.
Min. pulsewidth: 1.5 ns (as
width of output module in
external width mode).
Strobe output and trigger
output
Strobe output: user-defined,
16 kbit pattern (NRZ) when in
pattern mode.
Trigger format: one pulse per
period with 50% duty cycle
typical.
External mode: 1.5 ns typ. for
HP 81110A. 5.9 ns typ. for
HP 81104A.
Level: TTL or ECL selectable.
Output impedance: 50 Ω
typical.
Max. external voltage:
-2 V/+7 V.
Transition times: 1.0 ns typical
for TTL, 600 ps typical for ECL.
User Interface
Overprogramming: all
parameters can be
overprogrammed (exceeding
specifications) to fully exploit the
hardware limits.
Setting check: warning
messages indicate potentially
conflicting parameters due to
inaccuracy. Error messages
indicate conflicting parameters.
Help key: displays a context-
sensitive message.
Autoset key: resolves all timing
conflicts.
Non-volatile memory: current
setting is saved on power-down.
Up to nine user settings and one
fixed default setting can be stored
in the instrument.
Clear memory: clears all nine
user settings.
Memory card: 99 settings can be
stored on a 1 MB PCMCIA card
(MS-DOS
®
).
Remote Control
Operates according to IEEE
standard 488.2, 1987 and SCPI
1992.0.
Function Code: SH1, AH1, T6,
L4, SR1, RL1, PP0, DC1, DT1,
C0.
Programming times: all checks
and display off.
Note:
[1] Subtract 4 ns from the typ. delay value when referring to OUTPUT1/2 for the
HP 81112A output module and add 1 ns when referring to OUTPUT1/2 for the
HP 81104A with the HP 81105A output module.
ASCII command Typ. exec.
time
One parameter or 30 ms typ.
mode
Recall setting 250 ms typ.
16 k pattern transfer 600 ms typ.
(28 pagine)
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