Multichannel Systems STG4002 Manual - Manual (Page 87)

Analog Output Signals
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Example 3b: Current Mode: The green trace shows the current output (+I) with a load resistance
of 1 M
; and the pink trace shows the TTL output from the Sync Out that was used for
triggering the oscilloscope

Rise time with programmed 5 V and 500 μA pulses, 1 M
 load resistance.
Rise time (10 % / 90 %) = 120 μs
Result of Example 3: With a higher load resistance, the current pulse shows a different
kinetic behavior: The rise time increases significantly (about 100 μs). Please keep in mind
that the resistance of the oscilloscope probe with 10 M
 is parallel to the 1 M load resistance.
That means, that the maximum of the load resistance is reduced to 900 k
 only.