ML248xA / ML249xA Common Procedures
5-84 13000-00162
September 2005
Holding Sensors on the Current Range
1. Press the Sensor hard key and then the Range Hold soft key.
If the sensors are auto-ranging when the soft key is pressed, the sensors are held on
their current range. If the power meter is an ML2488A and one sensor is currently
held on a range, pressing Range Hold will cause the other sensor to be held to its
current range as well. If range hold is already enabled for both sensors, pressing
Range Hold will set them back to auto-ranging. The LED on the soft key is lit green
when a sensor range is being held.
Typical range hold values for the MA2472B power sensor and the MA2491A
wideband sensor are shown in the table below.
Mode Range MA2472B MA2491A
1 top +20dBm +20dBm
bottom -13 -7
2 top -12 -6
bottom -27 -20
3 top -25 -19
bottom -43 -36
4 top -42 -35
bottom -58 -53
5 top -57 -52
CW
bottom -72 -67
6 top
bottom
Reserved for “True RMS” sensors.
7 top 20 20
bottom 0 5
8 top 1 6
bottom -13 -8
9 top -12 -7
Pulsed/
Modulated
bottom -34 -28
Notes:
• The figures in the MA2472B column apply to all standard diode and thermal sensors.
• The figures in the MA2491A column apply also to the MA2411A.
• The figures in the table above were obtained with a 1GHz CW input signal.
• All values are approximate and are provided for guidance only. They will vary
between individual sensors, with frequency and with modulation conditions.
• Ranges 7 to 9 have large overlaps in range hold to extend the range of signals with
deep modulation that can be accommodated in a single range.
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