Manual 21568, Rev. F, March 2008
2
Operation
2.1
Introduction
When a sensor is first connected to a Model 8540 or 8650 Series Universal Power Meter or to a
Model 58542 VXIbus Universal Power Meter, it is necessary to calibrate the sensor to the
meter’s sensor input, using the meter’s power sweep calibration system. The power meter will
not allow measurements to be performed until this calibration is completed successfully. It is a
good practice to repeat the calibration whenever the ambient operating temperature of the
sensor varies by more than
±
5 °C (
±
9 °F), and whenever any external connections or external
loads are added or removed from the sensor. Always allow a 30 minute warm-up period before
calibrating the sensor.
*
NOTE:
These instructions show the Series 8540 Power Meter front panel keys in brackets
[ ] and menu displays in bold print.
The operational description of the 8035XA Peak Power Sensor applies to applications with
either the Series 8540 or 8650 Universal Power Meters (8541/2, B and C) or the Model 58542
VXIbus Universal Power Meter. Except where noted, the front panel descriptions apply only to
the Series 8540 Power Meters, and SCPI command sequences apply to the Model 58542
VXIbus Power Meter. The Series 8650 Power Meter display lines vary from the Series 8540 but
include the same parameters.
2.2
Power Sweep Calibration
Procedures for calibrating sensors to the meter are detailed in the specific power meter
manual. The 8035XA Peak Power Sensors are calibrated to the meter using the same
procedure as other sensors used with the 8540, 8650 Series Power Meters or the 58542 VXI
Power Meter. Connect the channel A sensor to the calibrator port, and press [ZERO/CAL].
Following the successful completion of Power Sweep Calibration, the 8541/2 will automatically
display the current value of sample delay for your 8035XA Series Peak Power Sensor. If the
sample delay does not appear, press [RECALL], select
PRESET
, and press [ENTER].
If you are using the dual channel 8542 Universal Power Meter, verify that only one 8035XA
Series Peak Power Sensor is connected. The 8542 will automatically display peak power on
one line and sample delay on the other. When two sensors are attached, the display will default
to display the two power levels. Some test procedures, such as A/B ratio measurements, will be
easier after performing some configuration of the display parameters. Press [MENU], select
A,
B, A/B . . . B-A
with the arrow keys, and press [ENTER]. This menu will allow you to select
various power measurements as well as DLY
A
and DLY
B
for the two line display.
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