Racal Instruments 3152, User Manual

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Getting Started 1-4
Supplied
Accessories
The Model 3152 is supplied with an Instruction Manual. The manual
includes disks with VXIplug&play soft front panel and drivers along
with WaveCAD for Windows. A Service Manual is available upon
request.
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
S
after 30 minutes of warm up
time, and within a temperature range of 20
o
C to 30
o
C. Specifications
outside this range are degraded by 0.1% per
o
C.
Functional
Description
A detailed functional description is given in the following
paragraphs. The description is divided into logical groups: input and
output connectors, operating modes, output type, output state,
synchronization, filters and front panel indicators.
Input and Output
Connectors
The Model 3152 has 5 BNC connectors on its front panel: main
output, SYNC output, phase modulation input, reference clock
output and the trigger input.
Main Output The main output connector outputs standard, user, and sequenced
waveforms. Output impedance of this output is 50
S
, that is, the
cable which is connected to this input should be terminated with a
50
S
resistance. Output amplitude accuracy is calibrated when
connected to a 50
S
load. If the output is connected to a different
load resistance, determine the actual amplitude from the resistance
ratio of the internal 50
S
to the load impedance. The output
amplitude is doubled when the output impedance is above 1 M
S
.
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 SYNC output generates a single point pulse for
standard and arbitrary waveforms. The location of the SYNC signal
along the waveform is programmable from point 2 to the last point
on the waveform
.
External Clock Input The External Clock Input is available for those applications required
to run the complete system off the same clock. Normally, this input
is disabled. When enabled under program control the clock at this
input replaces the internal clock generator and the output waveform
will begin generating waveforms with clock rates that are present at
the external clock input. Do not confuse the clock frequency with
the frequency of the waveform. The actual frequency of the output
waveform depends on the number of points that are allocated for
the waveform. For example, if the external clock is 10 MHz and the
number of points that were assigned to the active segment is 1000,
the output frequency will be 10 KHz (10 MHz divided by the number
of points). The external clock input accepts fixed level ECL signals
within the range of DC to 100 MHz.
PM Input The PM Input accepts signals that phase modulates the main output
frequency. The phase modulation function operates in conjunction
with the PLL function. The PM input is active at all times. Therefore,
unless you intend to use this function, do not connect any cables to
this input during normal operation of the Model 3152.