APPENDIX I
MODEL 268A-1T CHARGED PLATE ANALYZER WITH VARIABLE TIMER OPTION
VARIABLE TIMER OPTION
The Model 268A-1T Charged Plate Monitor with variable timer stop option has the same two
timer ranges as the standard unit when set in the "FIXED" mode of operation. In the optional
"VARIABLE" timer mode, timing will start at either 5000 volts or 1000 volts as selected by
the user. The timer will then stop at a user- selected voltage set on the front panel mounted
turns-counting dial from 0 to 1000 volts with 1-volt increments.
This option is available either factory installed at the time of purchase or as a factory
installed aftermarket upgrade to the basic Model 268A-1
VARIABLE TIMER OPTION OPERATING INSTRUCTIONS
1. Power unit on.
2. Select either 5kV or 2kV plate voltage level (measuring range).
3. Make sure NORM/PEAK button is in NORM position (not depressed).
4. Set timer STOP LEVEL (turn pot) to desired plate voltage stop level (0 to 1000 volts).
5. Press VARIABLE on TIMER LIMIT switch.
6. Select 5kV or 1kV timer start level on TIMER LIMIT switch.
7. Select appropriate (+ or -) POLARITY for plate voltage.
8. Press CHARGE button and adjust to voltage above desired start voltage level.
9. Press DECAY button.
10. Observe PLATE VOLTAGE indicator as it decays. Timer indicator (SECONDS) will stop
when variable trip point is met.
11. For additional tests, repeat steps 8 thru 10.
Note: To return unit to normal operation, switch unit to FIXED on the TIMER LIMIT switch.
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