Publication 21555, Rev. E, September 2002
1-1
1
Introduction
1.1
Description
The Giga-tronics 58542 VXI Universal Power Meter offers high accuracy with an ultra-fast reading rate
and dual power inputs. Depending on the sensor used, the frequency range is from 10 MHz to 40 GHz
for CW signals and 50 MHz to 40 GHz for pulsed signals. The unit is optimized for fast measurements
over the VXI bus. Maximum measurement speed is achieved with an internal data buffer, which logs a
user-specified number of measurements for subsequent transfer over the VXI bus.
The 58542 is optimized for the fast measurements required by ATE systems. The 58542 diode-based
sensors have response times significantly faster than thermal sensors. The high measurement speeds are
available over a wider dynamic range than with thermal sensors. The power meter uses the Standard
Commands for Programmable Instruments (SCPI) language. It is a message-based instrument that
responds to high level ASCII character SCPI commands. The commands are parsed and interpreted by
the power meter. Their standardized (English) language format makes SCPI program development fast
and easy.
The power sweep calibrator incorporates a built-in thermistor-based power meter bridge. The thermistor
oven stability provides a standard 1 mW power reference at 50 MHz, traceable to the National Institute
of Standards and Technology (NIST). The thermistors inherent linearity produces 51 precisely
controlled power levels from -30 to +20 dBm for linearizing the diodes in the power sensors.
The excellent resulting linearity of
±
0.5% (
±
0.02 dB) complements the low VSWR of the sensors and
tightly specified Cal Factor uncertainty. The Cal Factors are stored in EEPROMs in each sensor so that
only entering a frequency of operation to the power meter is needed to obtain frequency corrected
power readings.
The 58542 power meter is a standard C-size (single-width) VXI module. It weighs 2.5 kg (5.5 lbs).
Power requirements are +5 Vdc @ 800 mA, +24 Vdc @ 250 mA and -24 Vdc @ 250 mA.
The 58542 uses Giga-tronics Series 80300 Schottky diode-based sensors for fast measurements with a
dynamic range of up to 90 dB, depending on the sensor. Excellent linearity of
±
0.5% is assured through
a built-in power sweep calibrator. Special purpose CW sensors are available, including low VSWR
sensors, four high-power versions (1W, 5W, 25W and 50W), and True RMS sensors with 50 dB dynamic
range. Peak power sensors are available for making true instantaneous power readings on pulsed signals
such as radar and digital communications. The sensors sample pulsed RF signal amplitude directly,
therefore a duty cycle correction is not required.
Refer to Appendix B in this publication for power sensor selection and specifications data. Appendix C
contains technical data for options available for the 58542.
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