User manual

Digital High Frequency Analyser HF58B-r
© Gigahertz Solutions GmbH, 90579 Langenzenn, Germany Revision 4.5 (Febuary 2006) Page 16
Measurement ranges of the HF58B-r
Instrument as delivered,
i.e. without preamplifier or attenuator
switch "Adapter"("Pegelanpassung") to "0 dB"
Range
Bar on LCD
Displayed value & unit
Coarse
0.01 - 19.99 mW/m²
Medium
00.1 - 199.9 µW/m²
Fine
0.01 - 19.99 µW/m²
Simply read out, no correction factor
With ext. Attenuator DG20,
switch "Adapter" to "Attenuator -20 dB"
Range
Bar on LCD
Displayed value & unit
Coarse
1 - 1999 mW/m²
Medium
0.01 - 19.99 mW/m²
Fine
.001 - 1.999 mW/m²
Simply read out, no correction factor
With ext. Preamplifier HV10,
switch "Adaptor" to "Amplifier +10dB"
Range
Bar on LCD
Displayed value & unit
Coarse
00.1 - 1999 µW/m²
Medium
0.01 - 19.99 µW/m²
Fine
.001 - 1.999 µW/m²
Simply read out, no correction factor
With ext. Preamplifier HV30,
switch "Adapter"("Pegelanpassung") to "0 dB"
Range
Bar on LCD
Displayed value & unit Actual unit
Coarse
0.01 - 19.99 mW/m² µW/m²
Medium
00.1 - 199.9 µW/m² nW/m²
Fine
0.01 - 19.99 µW/m² nW/m²
Same decimal point, but next smaller unit
(Coarse = grob; Medium = mittel; Fine = fein)
Why no column „dBm“?
Most recommended limiting values for HF radiation are
given in W/m² (sometimes also in V/m), which is why
this instrument is displaying in power density, µW/m²
resp. mW/m². A display in dBm as e.g. on a spectrum
analyzer requires transformation by a complicated
formula, which depends on frequency and specifics of
the antenna used. A “re
conversion” therefore does not
make sense.
Conversion Table
( µW/m² to V/m )
µW/m² mV/m µW/m² mV/m µW/m² mV/m
0,01 1,94 1,0 19,4 100 194
- - 1,2 21,3 120 213
- - 1,4 23,0 140 230
- - 1,6 24,6 160 246
- - 1,8 26,0 180 261
0,02 2,75 2,0 27,5 200 275
- - 2,5 30,7 250 307
0,03 3,36 3,0 33,6 300 336
- - 3,5 36,3 350 363
0,04 3,88 4,0 38,8 400 388
0,05 4,34 5,0 43,4 500 434
0,06 4,76 6,0 47,6 600 476
0,07 5,14 7,0 51,4 700 514
0,08 5,49 8,0 54,9 800 549
0,09 5,82 9,0 58,2 900 582
0,10 6,14 10,0 61,4 1000 614
0,12 6,73 12,0 67,3 1200 673
0,14 7,26 14,0 72,6 1400 726
0,16 7,77 16,0 77,7 1600 777
0,18 8,24 18,0 82,4 1800 824
0,20 8,68 20,0 86,8 2000 868
0,25 9,71 25,0 97,1 2500 971
0,30 10,6 30,0 106 3000 1063
0,35 11,5 35,0 115 3500 1149
0,40 12,3 40,0 123 4000 1228
0,50 13,7 50,0 137 5000 1373
0,60 15,0 60,0 150 6000 1504
0,70 16,2 70,0 162 7000 1624
0,80 17,4 80,0 174 8000 1737
0,90 18,4 90,0 184 9000 1842