Atec Agilent-81150A-81160A User Manual

Page 23

81150A Trigger Out 1/Trigger Out 2

81150A

Output level
TTL
ECL

Selectable TTL/ECL
0 V / 2.5 V nom.
-0.85 V/-1.80 V nom.

Pulse width
Internally triggered, continuous
Externally triggered

50% duty cycle typ.
4 ns typ.

Transition time (20% to 80%)

2.0 ns typ.

Maximum rate

120 MHz

(1)

Impedance

50 Ω nom.

Connector

BNC, front panel

1) For output frequencies > 120 MHz, the trigger rate is ¼ of the output frequency. If a frequency sweep or a FSK

frequency exceeds 120 MHz, the trigger rate is ¼ of the output frequency.

For 81150A, a separate trigger output is provided for each channel on the front-panel.

In advanced mode internally/externally modulated (AM, FM, PM, PWM), the trigger
output has the frequency of the unmodulated carrier waveform, with a 50% duty cycle.

For FSK modulation, the trigger output has the same frequency as the data output.
That is, it alternates between the two frequencies.

If noise is selected, a trigger signal is generated when noise is restarted
internally, externally or manually.

For all other modes of operation the trigger signal (TRIGGER OUT) marks the start of each
waveform period.

81150A Trigger Outputs

81150A Strobe Outputs

A strobe output is provided for each channel on the front-panel of pulse generator 81150A. The
strobe output signal has a different function, depending on the mode of operation.

If no advanced mode is selected, the strobe output is a constant low.

In advanced mode internal/external triggered or gated burst, the strobe output provides a
signal indicating the duration of a burst. The rising edge of the strobe signal is synchronized to
the start of the ﬁ rst waveform period in a burst. The falling edge is synchronized to the start of
the last waveform period in the burst.

In advanced mode sweep with the frequency marker off, the strobe output is a pulse with
half the duration of the sweep. The strobe signal goes high at the beginning of the sweep.

In advanced mode sweep with the frequency marker on, the strobe output goes high at the
beginning of the sweep and goes low at the marker frequency.

In pattern mode (block mode = On), the strobe output goes high at the beginning of the
pattern and goes low at the last bit of the pattern. Refer to the User Guide for more details.

In advanced mode internally/externally modulated (AM, FM, FSK, PM, PWM), the strobe
output is the analog modulation waveform.

In pattern mode (block mode = On), the logical strobe signal goes high at the beginning of the
pattern and goes low at the last bit of the pattern. Refer to the User Guide for more details.

81150A Strobe Out 1/Strobe Out 2

81150A

Digital output level
TTL
ECL
Analog output level (modulator)

Selectable TTL/ECL
0 V/2.5 V nom.
-0.85 V/-1.80 V nom.
-2.0 V to 2.0 V (full scale)