Appendix A: Specifications
370B User Manual
A-5
Table A-2: Step Generator
Characteristic Performance Requirement Operating Information
Accuracy Current or Voltage Steps including Offset.
Incremental 1.5 %
Absolute Less than 1.5 % of total output + 3% x STEP
AMPLITUDE setting+1mVor1nA.
Less than 1.5 % of total output + 10 % x
STEP AMPLITUDE setting+1mVor1nA.
With .1X STEP MULTI pressed.
Offset control range Variable from -10 to + 10 times STEP
AMPLITUDE.
Resolution STEP AMPLITUDE settingx1%
Step transition timing (typical) Within3%ofcollector peak volts including
jitter.
Polarity is in AC mode.
Current mode
Amplitude range 50 nA to 200 mA in a 1 -2-5 sequence of 21
steps.
Maximum current 20 x STEP AMPLITUDE setting, except 10 x
STEP AMPLITUDE when control is set to
200 mA.
Steps and aiding offset
Maximum voltage At least 10 V Steps and aiding offset.
1
Maximum opposing offset current 10 x STEP AMPLITUDE
Maximum opposing volts Less than 15 V. When the voltage limiter is working in
opposing current setting condition, the step
generator output current value is not
guaranteed.
Ripple plus noise Less than 0.5 % x STEP AMPLITUDE + 10
nA.
BW = 20 MHz, with open circuit.
Maximum inductive load (typical) 1 mH
Output impedance (typical) More than 1/(0.3 % of STEP AMPLITUDE
current setting per volt) W
Fall and rise time (typical) Within 25 ms for 1 step or 100 ms for 10
steps.
1kW load, 100 mA/step
Overshoot and undershoot
(typical)
Within 10 % of transition amplitude. 1kW load, 100 m A/step
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