Operation
EPM2000/EPM2000e Reference Guide
23
LONG RISETIME MODE
The EPM2000 can accurately measure pulses with risetimes greater than 2 milliseconds and as long
as 10 milliseconds.
Press
to display the current risetime value. This value represents the maximum risetime
that can be accurately measured (10 ms maximum). The EPM2000 is set at the factory to measure a
2 ms maximum risetime. Pressing
or cycles this value through 2 ms, 4 ms, 8 ms, or 16 ms.
Changing the risetime value rescales the EPM2000's Trigger
Holdoff time. Additionally, it rescales the Trigger Holdoff
increment time, according to Table 2.
For example, if the risetime is 2 ms (factory default) and the
Trigger Holdoff time is 10 ms, then setting the risetime for 8
ms will change the Trigger Holdoff time to 40 ms. Attempts to
change it via the front panel by using the
or buttons
will cause changes only in increments of 4 ms.
Each of the EPM2000's channels can be programmed independently for different pulse risetimes.
POWERMAX ENABLE/DISABLE
An EPM2000 automatically detects an attached PowerMax probe when the power is switched on.
Disable this feature when the pyroelectric/silicon input is needed but the PowerMax probe remains
connected.
Disable the PowerMax function by pressing
. When the PowerMax function is disabled, it
will stay disabled, even after instrument power has been cycled.
Enable the PowerMax function by pressing
.
Maximum
Risetime
Selected
Trigger
Holdoff
Increments
Trigger Holdoff
Value
2 ms 1 ms Current Value
4 ms 2 ms Current Value * 2
8 ms 4 ms Current Value * 4
16 ms 8 ms Current Value * 8
Table 2: Results of changing
the EPM2000 risetime.
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