Section 4 Operation
4-22
(2) Calibration before measurement
The MT8801C has two types of power measurement functions.
For high precision measurements, calibrate the MT8801C as shown below.
(a) Power meter function
The power meter function uses a thermocouple for high-precision wide-
band measurement of average power.
In transmitter measurement, press the [Power Meter] F12 key in TX Mea-
sure mode and then select the Power Meter in Power Measure Method to
set the power meter function.
Calibrate the MT8801C at the zero power point for high-precision mea-
surements.
Zero-point calibration: Disconnect anything from the Main Input/Output
connector to set no input power, and press the [Zero Set] F11 key to auto-
matically calibrate the power meter at the zero power point.
For details on operation, see Paragraph 4.3.6, (5) "Power Meter."
(b) Burst-power measurement/IF level meter function
This function performs high-linearity narrow-band measurement of the IF
signal level of the MT8801C.
In transmitter measurement, press the [Gated Power] F9 key in TX Mea-
sure mode, or press the [Power Meter] F12 key and select the IF Level
Meter in Power Measure Method to set this function.
This function can measure the on/off power, rise/fall times and other con-
ditions of burst signals.
For high precision measurement, internal calibration is required.
There are two types of internal calibrations of the Adjust Range and Cali-
bration, as described below.
Adjust Range:
Optimizes the internal RF ATT, A/D input level, and power meter range of
the MT8801C for the signal to be measured. This function can increase the
measurement range for the on/ off ratio.
Calibration:
The MT8801C has two types of level calibration functions of Power Meter
Calibration (using an internal power meter) and Internal Osc. Calibration
(using an internal oscillator), those are used for calibrating the power mea-
sured results.
Pressing the Calibration Cancel key clears the calibration factor to 0 dB.
The calibration factor may become incorrect when the internal tempera-
ture rises, the ambient temperature changes, the measurement frequency
changes etc.. For precise measurement of the TX power, perform Calibra-
tion at that time.
For details on operation, see Paragraph 4.3.6 “Transmitter measurement.”
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