Specifications
*
*
RESET INPUT (BNC)
System Characteristics
Input impedance 50K ohms; source current 100 µA;
active-low or active-high selectable with FUNCTION slide-
switch C; minimum pulse width required to ensure reset
100 µs (5 mS for VMM-D1 mode A, B); TTL compatible:
minimum high-level +2.0 VDC, maximum low-level +0.8
VDC.
VMM-D1 VMM-T1
Name Description
*
*
Shutter Drive
Continuously variable frequency of exposures from DC to
the shutter's maximum rate; maximum peak pulse power
400 W, pulse voltage 70 VDC, pulse current 5.7 A (test
conditions: VS35 shutter, standard 5 Volt, 12 ohm coil
cycled with 20 mS exposure at 5 Hz).
*
Exposure Interval
0.1 mS (100 µS) to 9999 Sec (2.8 hrs) in five decade
ranges variable within each decade with 4-digit pushwheel
switches.
*
Delay Interval
0.1 mS (100 µS) to 9999 Sec (2.8 hrs) in five decade
ranges variable within each decade with 4-digit pushwheel
switches.
External Input Characteristics
VMM-D1 VMM-T1
Name Description
*
Repeat Exposure
01 to 99 exposures variable or continuous (00) selectable
with EXP PRESET 2-digit pushwheel switches; 35 mS
minimum between exposures (100 mS minimum for VS35,
VS45 shutters).
*
*
Accuracy
Exposure and Delay ± 0.5% all ranges (crystal time
base); maximum 20 µS propagation delay from
application of trigger to pulse applied to driver; Typical 5 -
7 µS delay.
*
TRIGGER INPUT (BNC)
Input impedance 50K ohms; source current 100 µA;
active-low or active-high selectable with FUNCTION slide-
switch A; minimum pulse width required to ensure
triggering 100 µS; TTL compatible: minimum high-level
+2.0 VDC, maximum low-level +0.8 VDC.
VMM-D1 & VMM-T1 User Manual
37
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