Lil'DMXter2 tm
The Volt Meter of Digital Lighting Control

The operation of the Lil'DMXtertm is designed to be intuitive, and as user friendly as possible. Many users will never need to know the technical details. But since the Lil'DMXtertm is a piece of reasonably accurate test equipment here are the specifications in gory detail.

TRANSMITTED DMX512 PARAMETERS

FUNCTION DEFAULT MINIMUM MAXIMUM RESOLUTION
BAUD RATE 250,000 as per DMX512
BREAK LENGTH 88S 50S 49144S (1) 1S
MARK AFTER BREAK 8S 3S 49064S (2) 1S
INTERFRAME MARK TIME 4S 4S 330S 22S
INTERPACKET MARK TIME 4S 4S 1.442SEC 22S
DIMMERS TRANSMITTED 512 1 999 1
UPDATE RATE 40 .594(3) 5200(4) NA
START CODES SENT 0 ANY START CODE

(1) Maximum with MAB set to 8S , (2) Maximum with break set to 88S, (1 or 2) The Total of break and MAB cannot exceed 49152S . (3) 512 dimmers, 49,144us break, 8S mark, 334S IBT(15 units), 1.454 second IPT (65535 units), (4) 1 dimmer, 88us break, 8us MAB

RECEIVED DMX512 PARAMETERS
FUNCTION MINIMUM MAXIMUM NOTES
BAUD RATE 250,000 as per DMX512
BREAK LENGTH 65S -
MAB LENGTH 3S -
NUMBER OF DIMMERS 1 512 OVFL reported for over 512 dimmers
BREAK-BREAK TIME 170S 3 SEC.
TERMINATION 120 Ohms +/- 5% DC coupled in'"End of Line' mode

ACCURACY
PARAMETER ACCURACY NOTES
TIMEBASE & BAUD RATE ACCURACY +/- 75 PPM 0 - 70 Degrees C, by design, not tested in production
TRANSMITTED BREAK JITTER NEGLIGIBLE Timebase jitter is the major source of break jitter
TRANSMITTED MAB JITTER NEGLIGIBLE Start code = 0 Break + MAB less than 16.380 mS
TRANSMITTED MAB JITTER +/- 4S Non-zero start code or break + mab time greater than 16,380ms
DIMMER FRAME JITTER +/- 2S
SCOPE TRIGGER TO BREAK JITTER NEGLIGIBLE Timebase jitter is the major source of jitter
RERC'D BRK,MAB

ACCURACY

+/- 250nS +/-75PPM (1) Sum of both errors, rounded as needed for display
REC'D BREAK TO BREAK +/-8S See section 5.2(5)

INPUT & OUTPUT VOLTAGE AND CURRENT LIMITS
VOLTAGE OR CURRENT NOTES
DMX512-OUT PINS 2&3 MAX VOLTS
MAX CURRENT
+20VDC, -12VDC(2)
+/- 100 MA
Withstanding voltage & current
DMX512-IN PINS 2&3(1) MAX VOLTS
MAX CURRENT
+50VDC, -30VDC
+/-7 MA
Withstanding voltage & current
PIN 4&5 IN or OUT +/-70 VDC SCOPE TRIGGER - OFF
DOUBLE ENDED CABLE TEST - OFF
PIN 4&5 OUT +15 VDC, -5 VDC
+/-100 MA
SCOPE TRIGGER - ON

(1) In terminated modes, in unterminated modes DMX512-OUT limits apply.

OPERATIONAL ENVIRONMENT LIMITS
PARAMETER RANGE NOTES
AC Line Voltage Required
North American Units
85 - 135 VAC
100 - 135 VAC
100mA - To operate
- To charge fully (1)
AC Line Voltage Required
Europe & Other 230 volt locations
170 - 270 VAC
200 - 270 VAC
50mA - To operate
- To charge fully (1)
AC Line Frequency Required ~50-60Hz For either voltage option
Humidity 0%to-95% Non-condensing
Altitude 0 to 1900 meters
Temperature 0 to 40 Degrees Celsius

(1) At line voltages below 110 (220) volts charging time will increase markedly. At 100( 200) volts charging time will be nearly double the 120( 230) volt time.


Goddard Design Company
51 Nassau Ave.
Brooklyn NY 11222 USA
718 599-0170 718 599-0172 fax
http://www.goddarddesign.com

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© copyright Goddard Design Co. 1998

last updated Dec 26, 1999