© 2020 Virginia Diodes, Inc.
—All Rights Reserved
7 October 2020
Typical Specifications
•
Input is WR10 waveguide (1.25 x 2.5 mm) with UG387 Flange. Useful frequency response is 75 GHz through the submillimeter
range, extending even to the visible.
•
Rear banana jack plugs provide a buffered connection to a 1 k
heater resistor (on the RF load), which is used for DC calibration.
This connection enables internal calibration checks on all of the meter’s ranges. Maximum response is up to 12.7 V. Absolute
maximum is 25 V.
•
RF accuracy is typically ± 5%.
•
Maximum VSWR <1.15:1 in 80-110 GHz band. VSWR is expected to be similar or better at frequencies up to 2000 GHz.
•
Analog output BNC connector on back panel: -10 to +10 VDC, with +10 VDC corresponding to full scale power on each range
and 0 VDC corresponding to 0 mW.
•
A USB (Type B) port is provided for full instrument control.
•
Temperature drift is compensated to <2
μ
W/°C.
•
Auto Scale Mode allows for relatively rapid range changes (~30 seconds) compared to the normal ranges. The range will
change automatically based on input power.
•
Operational temperature range: 10-30°C.
•
Required power: 100-240 V / 50-60 Hz.
•
Maximum Power: In CW operation, do not exceed 200mW. In pulsed operation, the PM5B measures the average power from
pulsed signals that have pulse rates faster than ~5 Hz (depending upon the scale used). The average signal power must be
kept below 200mW for safe operation, or the sensor head may be damaged. The peak power in the pulse can be as high as
10 Watts, but only if the duty cycle and pulse width are adjusted to maintain an average signal power below 200mW. Please
contact VDI for additional details and questions.
Typical Performance
Scale
(FS)
Time for
90%
Response*
Analog/Digital
Update Rate
RMS Noise
(USB out)
Display
Update Rate
RMS
Noise
Display
200 mW
0.15 s
35 Hz
0.5 µW
4 Hz
~0.2 µW
20 mW
0.2 s
20 Hz
0.2
W
2.5 Hz
~0.08 µW
2 mW
0.6 s
5 Hz
0.04
W
2.5 Hz
0.03 µW
200
W
12.0 s
1 Hz
0.003
W
1 Hz
0.003 µW
*
Figure 1:
Response time is given as the time from application of an input to a response at the analog
output of 90% of the final reading. Specifications are typical for changes in power greater than 0.075%
of full range.
Servicing the PM5B
Call 434.297.3257 for service details or email VDI at:
PM5B Specifications and Service
