d. Trace. The pen must record in true rectilinear, precise, instant drying, and of constant width of 0.01 inches nominal at any chart speed velocity. It must have sufficient ink supply for at least one year of typical use and have a chart length of 275 feet nominal. The pen must record in any position, be clog free, and start writing immediately even after remaining idle for long periods. The tracer can be either pressurized fluid or fine-line thermal marking. For fine-line thermal marking the recorder should be resistant to pressure, will not wear out over the life of the recorder, and will not prematurely bum out even in the most demanding applications.
e. Event markers. The left and right event marker pens will have coding information and recording events capability. One of the event markers should also mark time which is activated by a timer that generates a 40-MS output pulse at eight internally programmable repetition rates of 0.1, 1, 10, 1000 seconds, and 0.01, 0.1, 1 and 10 minutes.
f. Operating temperature. The operating temperature for the four channel recorder is 0°C at +50°C.
g. Storage temperature. The storage temperature for the four channel recorder is -40°C to +70°C.
h. Humidity. The humidity for the recorder is 95% at 32°C non-condensing.
2. Performance requirements of each recorder.
a. Frequency response. The frequency response at 50-MM amplitude-is DC to 50 HZ + 2%. For alternate amplitudes, such as 100-MM amplitude, it is DC to 30 HZ + 2%, and for 40-MM amplitude it is DC to 60 HZ + 2%.
b. Rise time. The rise time at 10% to 90% full scale with less than 1% overshoot is 5 milliseconds at 50-MM amplitude. Alternate rise time is 8 milliseconds at 100-MM amplitude, and 4 milliseconds at 40-MM amplitude.
c. Pen position. The analog pen can be positioned anywhere on the channel and still have a continuously adjustable + 100% full scale.
d. Common mode rejection noise ratio. The rejection ratio at 1 KOHM inbalance across the input signal points is 80 DB for DC signals and 60 DB for 60 HZ signals.
3. Stability.
a. Zero-line instability (drift). The zero-line instability of the recorder after 15 minutes of warm-up is ± 0.1% of full scale for 24 hours or running, ± 0.05% of full scale per degree celsius, and ± 0.05% of reading for ± 10% line voltage change.
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