Boonton 4500B Peak Power Meter - Manual (Page 52)

Boonton 4500B RF Peak Power Analyzer
Getting Started 3-18
3.5 Calibration
Before any measurements can be acquired with the Model 4500B, a sensor must be connected from the instrument to the
built-in calibrator, and calibrated. The following steps will guide the operator through the calibration process. This
explanation covers a single channel configuration. If a second channel and sensor is available, repeat the steps for channel 2.
Note If the sensor was just connected to the instrument or the instrument was just turned
on, please wait at least 15 minutes for the instrument to warm up before autocalibration.
Also, if the sensor has been previously calibrated on this instrument and channel, the 4500B will remember
the calibration and apply the result. If this is the case, the ―Sensor_ Needs AutoCal‖ message will not
appear. Instead, normal operation will begin. You may want to continue with the steps following to learn
the calibration procedure.
STEP PROCEDURE
1. Connect a Boonton Peak Power sensor to the instrument‘s CHANNEL_ input using the supplied cable. The cable
will have a silver multipin connector on each end. To connect the cable, align the red dots between the connector
and sensor and insert. Once the connector clicks into place, the cable will not pull out without sliding the barrel of
the connector away from the connection point. The other end of the cable connects to the measurement channel (1)
input connector as identified in Figure 3-1 item 13.
2. Connect the sensor to the "N" connector for the internal calibrator as identified by Figure 3-1 item 9. If the sensor
has a "K" style connector, use the "K" to "N" adapter (95105501A) provided. 26.5 GHz and 40 GHz sensors will
need this adapter.
3. Press INIT key. This configures the instrument to pulse mode. However, a pulse waveform will not appear unless
the calibrator is turned on.
4. Press MEAS key.
5. Select Meas > Freq CH1> by pressing the menu key associated with it. The box around the menu will be
highlighted. This indicates that the frequency function is selected for number entry. Frequency is given in hertz. To
select a frequency value of 1 GHz, press the "1" key followed by the "G" (for giga) key. This causes the frequency
cal factor (correction factor) for the sensor to be read from the sensor‘s internal memory and automatically be
applied to the measurement. The actual value of the cal factor can be displayed at Chan 1 > Exten > Corrections >
Freq CF. Although in this case the value should have already been set to 1 GHz by the INIT key, it is good practice
for learning the operation of the instrument.
6. Press the CHAN function key.
7. Press the Chan 1 > Calibration menu key.