Chapter 1
Operation
27
67 MONITOR INT TEMP
– Monitors internal ambient temperature. If the temperature
exceeds 50°C, the TEMP HI error message will be displayed. If this occurs, power
should be shut off immediately and not turned on again until the over-heating is
remedied. See TEMP HI error message.
70 MONITOR HV
– Monitors the programmable high voltage power supply voltage
which should vary between 200 V and 800 V, depending on the gate pulse width,
e.g., narrower pulse widths require higher voltages. See HV FAIL error message.
77 SET MCP VOLTAGE
– Controls gain of external MCP for MCP-100 option. See
MCP-100 chapter for more details.
80 DELAY SWEEP DEMO
– Demonstrates gate pulse delay sweeping, i.e. “box-car”
like mode.
81 PULSE SEQ DEMO
– Demonstrates programmable pulse sequence.
89 LOGO
– Continuously display Princeton Instruments logo and pulser model
number.
90 GATE DELAY
– Same as dedicated function key. Serves as backup in case of
function key failure.
91 GATE WIDTH
– Same as dedicated function key. Serves as backup in case of
function key failure.
92 DELAYED TRIG
– Same as dedicated function key. Serves as backup in case of
function key failure.
93 TRIG SELECT
– Same as dedicated function key. Serves as backup in case of
function key failure.
94 TRIG LEVEL
– Same as dedicated function key. Serves as backup in case of
function key failure.
100 CLEAR SEQUENCE
– Clears out previously entered pulse sequence.
101 ADD SEQ PT
– Takes current PG-200 settings as the next sequence point.
102 START SEQ
– Starts executing a series of previously entered sequence points.
103 STOP SEQ
– Stops executing sequence points. Also stops pulse sweeping if
enabled.
105
SKIP TRIG
– Skips a pulse in a pulse sequence, i.e. no pulse outputs will be
produced in response to an input trigger. This feature can be used to “count input
triggers” before producing output pulses.
Pulse Sweeping and Sequencing
The PG-200 has two modes for producing a series of pulses, Pulse Sweeping and Pulse
Sequencing. Pulse Sweeping, or “box-car like” mode, is when the gate pulse is varied
from an initial delay to a final delay in fixed increments. All other parameters such as
gate width remain fixed. Up to 16,000 delay steps can be programmed in step sizes as
small as 1 nsec. Pulse sequences are entered on a point by point basis and provide much
more flexibility since more parameters may be varied from point to point. The maximum
number of points in a sequence is 250 due to memory limitations. Sequences are
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