Teledyne LeCroy PXA125 - Manual (Page 22)

User Manual PXA125
1-8 Portrayal
Accessories Manual, ArbConnection for Windows 95/98/ME/2000/XP/NT and plug
& play drivers.
Specifications
Instrument specifications are listed in Appendix A. These
specifications are the performance standards or limits against which
the instrument is tested. Specifications apply under the following
conditions: output terminated into 50
Ω after 30 minutes of warm up
time, and within a temperature range of 20 ° C to 30 ° C. Specifications
outside this range are degraded by 0.1% per ° C.
Functional
Description
A detailed functional description is given in the following paragraphs.
The description is divided into logical groups: front panel connectors,
operating modes, output type, output state, filters and
synchronization.
Front Panel
Connectors
The PXA125 has 3 BNC connectors on its front panel: main and
SYNC outputs and trigger input. There are also 2 SMB connectors:
sine output and 10 MHz reference input. These connectors are
described below.
Output
The output connector outputs fixed (pre-defined) waveforms to 50
MHz, user (arbitrary) and sequenced waveforms with sampling clock
to 125 MS/s. Output impedance is 50
Ω , that is, the cable connected
to this output should be terminated with 50 Ω load. Amplitude
accuracy is calibrated when connected to a 50 Ω load. The amplitude
is doubled when the output impedance is above 1 M Ω .
SYNC Output
The SYNC output generates a single TTL pulse for synchronizing
other instruments (i.e., an oscilloscope) to the output waveform. The
SYNC signal always appears at a fixed point relative to the waveform.
The location of the SYNC signal along the waveform is
programmable. The SYNC output is also used as marker output when
the sweep, or FM functions are turned on.
TRIG/FSK IN
In general, this input accepts signals that stimulate generation of out-
put waveforms. The trigger input is inactive when the generator oper-
ates in continuous mode. When placed in trigger, gated or burst
modes, the trigger input is made active and waits for the right condi-
tion to trigger the instrument. In trigger and burst modes, the trigger
input is edge sensitive, i.e., it senses transitions from high to low or
from low to high to trigger the PXA125. The direction of the transition
is programmable. In gated mode, the trigger input is level sensitive,