Model
SD-201
DIGITAL SHOT DURATION TIMER
FEATURES/BENEFITS  
  • Meets AMS, ASTM, & Mil Standards
  • NIST Traceablilty assures meter accuracy
  • 6 Digit Liquid Crystal Display
  • Meter Accuracy within 0.2% (at 10-70 deg. C)
  • Display Level of 0 to 999.999 milliseconds
  • Completely Portable
  • Durable Molded Case
  • Rechargeable Batteries Included
  • AC Charger / Adapter Included


The Gould-Bass Model SD-201 Shot Duration Timer is a portable, hand-held instrument that measures the time that an AC or DC magnetizing current flows through test parts on magnetic particle inspection machines.

The easy to read liquid crystal display reports the duration of current flow from 0 to 999.999 milliseconds and is accurate within 0.2%. Unlike other timers that only sense the internal machine timer setting or the contact closure time, the Gould-Bass SD-201 measures the actual length of time that the magnetizing current flows through the test/inspection part. (Note: Due to the varied rise times of MPI equipment, a machine's internal timer may need to be adjusted to 700 milliseconds or more to achieve an actual current flow of 500 milliseconds in duration.) With the Gould-Bass Model SD-201, the actual output current flow time is measured to assure that test pieces inspected with MPI equipment receive the proper duration of magnetizing current flow in order to produce optimum defect indications.
 
Technical Data
Model Number SD-201
Part Number N500411001
Display Range 0 to 999.00 milliseconds
Display Type 6 Digit LCD 0.35 inch high
Accuracy +/- 0.2% at 10 to 70 degrees Centigrade
Signal Requirements 0.005 to 30 Volts AC/DC
Power Requirements Rechargeable Battery 9V.
Battery Usage Time 24 Hours Between Charges
Battery Recharge Time 8 Hours (approx.)
Humidity Range:  0 to 100% (Non-condensing)
Dimensions:
- Readout Unit Only
- Lead Length
- SD-201 in Polymer Case
3-1/2" Wide, 5-3/4" Long, 1-3/4" High 
30" Long
10-1/4" Wide, 7-1/2" Long, 3" High
Weight 800 g (1 lb., 15.2 oz.)
Recommended Calibration 
Interval		 The SD-201 Digital Shot Duration Timer should be returned to the factory every six months for recalibration and routine inspection service. The recommended six month interval is based upon normal usage of intermittent readings. If the unit is used continuously, recalibration should be performed more often. 
Operating Instructions
The SD-201 is Easy to Operate
  1. For wet horizontal MPI machines, clamp a shunt (1000A-25mv, 1000A-50mv) between the headstock and tailstock. If a shunt is not available, a 1" diameter by 18" long copper rod can be substituted.
  2. Attach the SD-201 test leads across the shunt terminals, or one lead to the headstock and the other lead to the tailstock if a copper conductor is used.
  3. Turn the SD-201 power switch to the "ON" position.
  4. Energize the MPI machine at maximum output in the contact mode. 
  5. The current shot duration is displayed on the LCD. The reading is in milliseconds to three decimal points, accurate within 0.2%
Gould-Bass Company, Inc., - 1431 W. Second Street, Pomona, CA 91766 - (909)623-6793, - FAX (909)629-1467