Measurement Computing 6222 - Manual (Page 27)

Specifications are subject to change without notice.
6222 User’s Manual Specifications 8-3
Counter Input
Channels ............................................................................. Up to 4 independent
Resolution ........................................................................... 32-bit
Input frequency ................................................................... 20 MHz maximum
Input characteristics ............................................................ 10 k Ω pull-down
Trigger level ....................................................................... TTL
Minimum pulse width ......................................................... 25 ns high, 25 ns low
Programmable modes ......................................................... Counter, Encoder
Encoder resolution .............................................................. x1 (default), x2, and x4
Encoder sources .................................................................. A, B, and Z; can be assigned to any digital pin x.
Counter source .................................................................... Internal Clock, Timer 1, Timer 2, and digital pin x.
One source can be used in multiple counters.
Counter mode options......................................................... Totalize, Clear on Read, Rollover, Stop at the Top,
Increment, Decrement, Rising Edge, Falling Edge
Counter gate options ........................................................... Unused, Internal Clock, Timer 1, Timer 2, and
Digital pin x. One gate can be used in multiple
counters.
Safety
Safety Voltages
Only connect voltages that are within these limits.
Channel-to-COM ................................................................ ±30V max
Isolation Voltages
Channel-to-channel ............................................................
Within each four-channel internal module .................. no isolation between channels
Between each four-channel internal module ............... 250V isolation
Note: There is no isolation between channels 1, 2, 3, and 4; no isolation between channels 5, 6, 7, and 8;
and no isolation between channels 9, 10, 11, and 12.
Channel-to-earth ground, continuous .......................... 250V
rms
, Measurement Category II
Note: Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution
system. This category refers to local-level electrical distribution, such as that provided by a standard wall outlet
(for example, 115 V for U.S. or 230 V for Europe). Do not connect to signals or use for measurements within
Measurement Categories III or IV.
Environmental
The 6222 is intended for indoor use only but may be used outdoors if installed in a suitable enclosure.
Operating temperature ....................................................... -40 to 50°C
Storage temperature .......................................................... -40 to 85°C
Ingress protection ............................................................... IP 40
Operating humidity ............................................................. 10 to 90% RH, noncondensing
Storage humidity ............................................................... 5 to 95% RH, noncondensing
Maximum altitude .............................................................. 2,000 m (6562 ft)
Pollution Degree ................................................................ 2