Buck M500 - Preparation and Operation; Preparation; Typical Operation with L250-1 Recorder

SECTION D
PREPARATION AND OPERATION
Preparation
1) Starting with S/N 678 the M500 uses an auto sensing power supply that will work at 100-127/200-
250 VAC. The first instruments were factory set for either 115 or 230 V.A.C., 50/60 Hz depending on
customer requirements. To alter the input voltage on them, raise the instrument cover and move the
input voltage jumper on the power supply P.C. board to the desired voltage as marked on the P.C.
board.
2) The main switch is located at the right rear corner of the instrument. Be sure it is in the "OFF"
POSITION. Connect the input cable to the instrument. Turn the Instrument "ON" and allow a 1-hour
warm-up and initialization period.
Note: Be sure the sample compartment is unobstructed during the reference scan.
3) A chart recorder receptacle is located at the left rear of the instrument. This is a 9 pin,"D"
subminiature type. The recorder cable (500-1129) provides complete control of the recording system
when the recorder is set to external. The Linseis Model L250-1 is the type normally supplied if
ordered separately. The chart format is a 250 mm width graph that is supplied with wavenumber vs. %
T legends. Note: As of January 2010 this recorder is no longer made.
4) A polystyrene test film is supplied with the instrument to enable a test of abscissa accuracy. If
periodic checks indicate an inaccuracy has occurred, contact BUCK Scientific for re-calibration
procedures.
Typical Operation with L250-1 Recorder
Place the M500 on a level, firm work surface free from vibration, r.f. energy sources and excessive
heat. (A clean environment will increase the life of the 500!)
1) Turn the 500 on and make sure it initializes. If the display doesn't come up initialization has failed.
2) Let the 500 stabilize (1 hour recommended).
3) Typical settings for low energy loss samples are reference mode, 3 minute scan time, gain 0 and pen
response .1 seconds.
4) Push the “scan” button. (This will store reference data into the 500's memory).
5) After reset, the 500 changes to the ratio mode and you can now get a true % T or Abs. reading.
6) Set 0 % T on the strip chart recorder (after turning it on) by blocking the 500's beam. Index the pen
at 4000 on the recorder.
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