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240 WAIT .1
250 OFF INTR 16
260 !
270 ! BEGIN E1446A CONFIGURATION
280 !
290 !Declare and initialize program variables
300 !
310 REAL In1_atten,In1_imped,In2_atten,In2_imped !input variables
320 REAL Out1_atten,Out1_imped,Out1_state !main output variables
330 REAL Out2_imped,Out3_imped !diff out variables
340 REAL Offset !DC offset variable
350 !
360 DATA 3.,50.,0.,50.
370 READ In1_atten,In1_imped,In2_atten,In2_imped !input atten and imp
380 !
390 DATA 0.,50.,1 !main output attenuation, impedance, and state
400 READ Out1_atten,Out1_imped,Out1_state
410 !
420 DATA 50.,50. !differential output impedances
430 READ Out2_imped,Out3_imped
440 !
450 Offset= 0. !DC offset
460 !
470 !Set E1446A base address and initialize COM variables
480 Set_addr(88)
490 !
500 !Set up E1446A
510 Setup_e1446(In1_atten,In1_imped,In2_atten,In2_imped,Out1_atten,Out1_imped,
Out1_state,Out2_imped,Out3_imped,Offset)
520 !
530 OUTPUT @Afg;"INIT:IMM" !E1445A wait-for-arm state
540 END
550 !
Setting the
(amplifier) Input
Impedance
This program sets the E1446A’s input impedance to match the output
impedance of the E1445A. The signal supplied by the E1445A is a 1
Vpp, 2 MHz square wave. The signal is amplified to 6.3 Vpp. Again,
when the intended output amplitude and the input amplitude are
known, the amount of attenuation (0 - 31 dB attenuator) is determined
by:
attenuation
(dB)
= 20 LOG V
o
/(V
i
* 10)
Example Programs Register-Based Programming C-19