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The variation of the ATEΉs voltage and current offsets as a function of source, time and temperature are tabulated in the static specifications table. These may be used to calculate the output effect by the relationship: DELTAEo= ±DELTAEr (Rf/RiDELTAEio(1+Rf/RiDELTAIio(Rf) where Rf is the feedback resistor, and Ri is the input resistor from the reference, Er.

The tabulated offsets, more particularly their change as a function of source, time and temperature, allow a user to calculate performance of the uncommitted amplifier(s) with user specified input and feedback components. The formula for this is given above.

   ATE STATIC SPECIFICATIONS
INFLUENCE QUANTITY OUTPUT EFFECTS PREAMPLIFIER
OFFSETS
VOLTAGE MODE CURRENT MODE
TYPICAL MAXIMUM TYPICAL MAXIMUM ΔEio ΔIio
Source Voltage (min.-max.) <0.0005% EO max 0.001% EO max <0.002% IO max 0.005% IO max <1μV <1nA
Load (no load-full load) <0.001% EO max 0.002% EO max <0.5mA (1) 1mA (1) — —
Time (8-hour drift) <0.005% EO max 0.01% EO max <0.01% IO max 0.02% IO max <20μV <1nA
Temperature, per °C <0.005% EO max 0.01% EO max <0.01% IO max 0.02% IO max <20μV <1nA
Ripple and
Noise (2)

(Slow Mode)
rms <0.1mV 0.3mV <0.01% IO max 0.03% IO max — —
p-p (3) <1mV 3mV <0.1% IO max 0.3% IO max — —
Ripple and
Noise (2)

(Fast Mode)
rms <1mV 3mV (4) <0.01% IO max 0.03% IO max — —
p-p (3) <10mV 30mV (4) <0.1% IO max 0.3% IO max — —

(1) For IO50A, load effect = 2mA typ., 5mA max. In slow mode the output capacitor adds 0 to 6mA to current mode load effect.
(2) One terminal grounded so that the common mode current does not flow throught the load or current-sense resistor.
(3) Bandwidth: 20Hz to 10MHz.
(4) For high voltage ATE 325-0.8M, the maximum output ripple and noise is 10mV rms and 50mV p-p.

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