Datasheet

20
damage and perform within the limit value. But if specify the high level value to be
+10Vdc and low level to be -10Vdc, the limit function won’t work anymore.
(2) DC offset: except that set DC offset as 0, the amplitude is only limited by limit level,
otherwise, which is further limited by DC offset, as following regulation:
DC offset + Vpp/2≤High Limit
DC offset – Vpp/2≥Low Limit
(3) Frequency: if frequency high enough, allowed maximum amplitude will be limited
(refer to chapter 5, Specifications)
(4) Channel Bandwidth: the output amplitude will decrease if frequency is higher. So
flatness compensation will be needed to ensure the accurate amplitude in
continuous output. But for other functions, once the frequency over 10MHz, the
amplitude will decrease.
(5) For the arbitrary waveform generator, if Vpp don’t reach to full range, the display
value is not agreed with the output value.
5.2.8 Amplitude Units: You can set the output amplitude in Vpp, Vrms, or dBm. Vpp is
available for all functions. For sine, square, ramp and pulse, Vrms can also be used. The
output units for amplitude can also be set to dBm if the external load is currently set to
‘non High Z’.
(1) In continuous mode, press〖Ampl Unit〗select units if current waveforms and load
condition allows. Different unit key will enable the different format displaying.
(2) For different waveforms, the convert relationship between Vrms and Vpp is subject
to, see below table:
Waveform
Vpp
Vrms
Sine
2.828Vpp
1Vrms
Square, Pulse
2Vpp
1Vrms
Ramp
3.464Vpp
1Vrms
(3) The relationship among dBm and Vrms and Vpp is subject to waveform and load,
dBm＝10×log
10
(P/0.001), while, P＝(Vrms)
2
/Load
If waveform is sine, set 50Ω load, the convert among three output units is shown below,
Vpp
Vrms
dBm
10.0000 Vpp
3.5356 Vrms
23.979 dBm
6.3246 Vpp
2.2361 Vrms
20.000 dBm
2.8284 Vpp
1.0000 Vrms
13.010 dBm
2.0000 Vpp
707.1 mVrms
10.00 0dBm
1.4142 Vpp
500.0 mVrms
6.9897dBm