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66319D current range dilemma

Question asked by deancs on Apr 2, 2012
Latest reply on Apr 3, 2012 by paulf

I'm using an Agilent 66319D in combination with the 14565B software to characterise the current consumption of a RF based device. 

I would like to characterise the current consumption of the device over a 'sleep-wake-transmit-standby-sleep' cycle that lasts just under a minute. I am using the 66319D as the power source and recording current consumption using the 14565B software in data logging mode. My issue is that the sleep current for the device is ~ 40uA while it's peak TX current is ~1.8A. Unfortunately I have been unable to configure my test rig to accurately measure both of these currents extremes during the operational cycle. 

If I configure the 66319D for low current mode (<20mA) then can't measure the peak current. Likewise if I configure the 66319D in High current mode (>1A) then the sleep current is rubbish (measure 40uA at roughly -20uA).

Does anyone know if there is a way to measure such extreme current ranges with these devices?