HP 8153A - Page 51

example, multi-wavelength sources). In other cases, the module sets this value
and you can display the value but you cannot edit it.
Display P'ormat nnnn.n nm
Limits Depends on the module used.
Resolution 0.1 nm
Default Depends on the module used.
CAL
This is a calibration offset that you can enter to compensate for external optical
circuitry. This value is automatically subtracted from the input signal.
Pmeasure d{dBm) = PinputidBm) - CAL(dB)
Where,
Pmcasurcd Is the ad^justod value of the signal read,
Pinput is the input signal level, and
GAL is the calibration offset.
Display Format ±nnn.nnn dB
Limits -200.000dR < nnn.nnn < +200.000dB
Resolution .OOldB
Default O.OOOdB
When the calibration factor is not set to zero, the CAL paremeter- indicator stays
on at half brightness.
T
This is the length of time over which a signal is averaged. Longer averaging
times increase the accuracy and improve the noise rejection of the
measurement. Longer averaging times also decrease sensitivity and increase the
length of time between updates of the results on the display.
For averaging times of 1 second or less, a new measurement is shown on the
display at the end of each averaging time. This is drawn in Figure 2-1. A new
measurement is shown on the display at each x.
Local Control • Measure Mode 2-3