Keysight 34461A - Page 230

SYSTem:PRESet
l All values are returned in the form +1.23450000E+01.
l When dB or dBm scaling is used, the CALC:AVER:AVER and CALC:AVER:SDEV queries return
+9.91000000E+37 (not a number).
Keysight Truevolt Series Operating and Service Guide
231
SCPI Programming Reference