449/449-2 Log/Lin Ratemeter

 Specifications

PERFORMANCE

LINEAR RANGES 11 ranges from 10 to 10⁶ counts/s full scale in 1-3-10 steps.

Dead Time <100 ns on the 10⁶ range; <0.3% of average pulse spacing up to the 3 X 10⁴ range; £1% on the 10⁵ and 3 X 10⁵ ranges.

Rated Overload Maintains full-scale output for X300 overload or 10⁷ counts/s, whichever is smaller.

Temperature Instability <±0.05%/°C.

Nonlinearity £±0.15% from 10 to 3 X 10⁴ counts/s range; £±1.5% from 10⁵ to 10⁶ counts/s.

Time Constants 7 selectable time constants, 0.03 to 30 s in 1-3-10 steps.

Zero Suppression 0 to 100% of full scale; nonlinearity of £±0.25%.

LOGARITHMIC RANGE One 5-decade range for 10 to 10⁶ counts/s.

Temperature Instability £±0.25% of full scale per °C.

Analog Output Error £±2.5% of full scale.

Standard Deviation ~15% with Log Short time constant; ~5% with Log Long time constant.

Slewing Rate Dependent on input rate; for any rate change. Log Short time constant provides 10 times faster response than Log Long time constant.

CONTROLS

RANGE 12-position switch selects the full-scale range and either linear or logarithmic mode; linear ranges are 0 to 10 counts/s through 0 to 10⁶ counts/s in 1-3-10 steps; log range is 10 to 10⁶ counts/s.

TIME CONSTANT 9-position switch selects an integrating time constant of 0.03, 0.1, 0.3, 1, 3, 10, or 30 s for linear ranges from 10 to 3 X 10⁴ counts/s or for any of these values divided by 10 for 10⁵, 3 X 10⁵, and 10⁶ ranges; Short and Long for the log range.

ZERO SUPPRESSION 10-turn precision potentiometer to suppress the zero-reference level for any linear range from 0 to 100%; the same full-scale span is effective above the preselected zero-reference level.

INPUTS

Accepts either positive or negative input signals with amplitude ³±3 V and width ³50 ns; ±30 V maximum; UG-1094/U BNC connectors on both front and rear panels.

OUTPUTS

PANEL METER 240° circular movement with 8.9 cm (3.5 in.) deflection; accuracy 2% of full scale; three scale markings, 0–1 and 0–3 for linear ranges and 10–10⁶ in five decades for log range.

ANALOG OUTPUT 0 to +10 V full scale, dc-coupled with 100-W output impedance; UG-1094/U BNC connector on rear panel.

RECORDER OUTPUT (A) Voltage output with 100-mV full scale; dc-coupled with 100-W output impedance; binding post connectors on rear panel.

RECORDER OUTPUT (B) Current output with 1-mA full scale; dc-coupled with 10-kW output impedance; binding post connectors on rear panel.

OPTION

449-2 AUDIBLE OUTPUT OPTION This option is in addition to the regular specifications of Model 449.

AUDIO OUTPUT A tone of variable frequency is furnished through a chassis-mounted speaker; the frequency increases from essentially 0 to 500 Hz, corresponding to the proportional meter deflection.

AUDIO THRESHOLD A 1-turn control mutes the audible output until the input rate exceeds the setting of the control and permits the output to be heard for all higher rates; range is 0 to 100% of selected full scale, linear, and log.

AUDIO VOLUME A 1-turn control adjusts the amplitude of the audible output from a near-inaudible level to a level that can be heard above normal laboratory ambient noise.

ELECTRICAL AND MECHANICAL

POWER REQUIRED +24 V, 50 mA; –24 V, 35 mA; +12 V, 30 mA; –12 V, 45 mA.

WEIGHT
Net 1.5 kg (3.5 lb).
Shipping 2.5 kg (5.5 lb).

DIMENSIONS NIM-standard double-width module 6.90 X 22.13 cm (2.70 X 8.714 in.) per DOE/ER-0457T.

ORDERING INFORMATION