21
OPERATING INFORMATION
{TIMING}
The Timing parameter menu has three selections: Delay, Width and
The selected Width should be narrow enough to meet duty factor requirements for
the repetition rate being used (see the Timing Requirements section). Note that
using Double Pulse doubles the duty factor.
Single/Double Pulse. No constraints are placed by the 202H on Delay settings in
Single Pulse operation. For proper Double Pulse operation, Delay should be
selected to allow at least 200 ns between trailing and leading edges. Width is
adjustable from 15 ns to 5 ms (keypad entry or remote programming allow width
values of 10 ns through 5 ms, as well as 0 ns, to be selected).
On wide pulses, droop will become apparent (0.005% per us). Width is specified
for 300 V pulses. Pulses of lower amplitude will show increased fall times and will
widen correspondingly as measured at 50% points-see Table 2-2).
{LEVEL}
The Level parameter menu for the 202H allows only the Peak Level selection. This
may be adjusted between 20 V and 300 V in 2 V steps. Baseline level is fixed at
0 V.
Positive or negative polarity is manually selected with a switch inside the module.
The POS or NEC LED on the module front panel lights to indicate polarity (and the
Polarity bit on the Module Status byte is turned off or on). The front panel display
only shows the magnitude of the Level selection.
After a level change is entered, the instrument may require a few seconds to settle
to the new programmed value. During this time, the Locked bit on the Module
Status byte will be
low.
{UNITS}
This key is not used with the 202H module (and has no effect). These keys are not
used with the 202H module (and have no effect).
FUNCTION
These keys are not used with the 202H module (and have no effect).
KEYS
{A} {B} {C}
