Home-Products-Electronic instruments-Counters, timers, rate meters and multi-channel scalers (MCS)-449/449-2 Log/Lin Count Rate Table

449/449-2 Log/Lin Count Rate Table

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Brief description:Linear and logarithmic modes 10 to 106 counts/second range Logarithmic range with 5 decimal digits 0 to 100% zero rejection Positive or negative input (50ns minimum width) Wide selection of time constants Selectable sound output The ORTEC 449 model Log/Lin count rate meter has two operating modes: linear and logarithmic

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Linear and logarithmic modes
10 to 106 counts/second range
5 decimal digit logarithmic range
0 to 100% zero suppression
Positive or negative input (50 ns minimum width)
Wide selection of time constants
Optional sound output
Low frequency counting from <10 counts per second to 10 million counts per second

The ORTEC Model 449 Log/Lin Count Rate Meter has two operating modes: linear and logarithmic. The linear mode has 11 full-scale ranges from 10 to 106 counts/second in steps of 1-3-10. The 5-digit logarithmic mode covers the range from 10 to 106 counts/second in a single range. These selections allow logical operation of the instrument when measuring low, medium or high steady-state pulse repetition frequencies or when monitoring whether frequencies vary over a wide range.

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- 449/449-2 Brochure
- 449/449-2 Brochure (A4)
- 499 Manual
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The round front panel meter provides excellent readability in both modes due to its inherently long effective range of 240° and indication accuracy of up to 2%.

Provides zero point rejection for any linear range up to 100%. By adjusting this control, any relatively constant count rate background can be subtracted from the data. Additionally, suppressing the zero point enables observing frequencies beyond the nominal full-scale limits with greater accuracy than can be achieved by switching to a higher range. 7 linear and 2 logarithmic time constant switches help accurately read the frequency of the input signal.

The Model 449 measures the frequency of positive and negative input signals with various pulse shapes. This provides the user with maximum flexibility in selecting input signal sources.

In addition to front panel instrumentation, it has outputs for current and voltage recorders, as well as a high-level voltage output for control or monitoring applications.

Model 449 is optionally available with a built-in audible sound output (Model 449-2) whose frequency changes with the count rate. The valid sound frequency range is 0 to 500 Hz, which corresponds directly to the full-scale range of the front panel meter. The sound output includes a threshold control for suppressing all sound until the input frequency exceeds a preselected sound threshold, and a separate sound volume control for sound monitoring of observed frequencies locally or at a relatively distant location.

For control and/or alarm applications, the Type 449 can operate accessory devices via its analog inputs.

Specifications +

Performance

Linear

range	from10Arrive10⁶count/seconds11full-scale range, with a step size of1-3-10。
dead time	in10⁶within the range<100 ns; in Gundam3×10⁴Within the range, the average pulse interval<0.3%; in10⁵and3×10⁵Within the range ≤1％。
Rated overload	forX300overload or10⁷count/seconds to maintain full-scale output, whichever is less.
temperature instability	<±0.05％/℃。
nonlinear	in10Arrive3×10⁴count/Within seconds ≤±0.15%; in10⁵to10⁶count/Within seconds ≤±1.5％。
time constant	7a selectable time constant,0.03to30seconds, the step size is1-3-10。
Zero point suppression	full scale0to100%; non-linearity ≤ ±0.25％。

Logarithm

range	10to10⁶count/seconds5Bit decimal range.
temperature instability	Full scale, per °C≤ ±0.25％。
Analog output error	Full scale≤ ±2.5％。
standard deviation	Logarithmic short time constant ~15%; logarithmic long time constant ~5％。
Slew rate	Dependent on input frequency; suitable for any frequency variation. Logarithmic short-time constants provide faster10times the response.

control

range	12Bit switches select full-scale range and linear or logarithmic mode; linear range is0to10count/seconds - 0to10⁶count/seconds, the step size is1-3-10;The logarithmic range is10Arrive10⁶count/seconds.
time constant	9bit switch can be from10Arrive3×10⁴count/linear range of seconds or any of these values divided by10of10⁵、3 X 10⁵and10⁶The range is0.03、0.1、0.3、1、3、10or30Select integration time constant between seconds; short and long logarithmic range.
Zero point suppression	10turn precision potentiometer for suppressing any0Arrive100% zero reference level over linear range; same full-scale range valid above preselected zero reference level.

Input

Acceptance range≥±3 V, width ≥50 nspositive or negative input signal; ±30 V; on the front and rear panelsUG-1094/U BNCconnector.

Output

Panel instrument	Deflect8.9cm (3.5inches)240°Circular motion; accuracy is full scale2%; three tick marks,0-1and0-3for linear range, five decimal places10-10⁶for logarithms range.
Analog output	0to+10 VFull scale, DC coupled,100 Ω output impedance; rear panelUG-1094/U BNCconnector.
logger output(A）	100 mVFull-scale voltage output; DC coupled,100 Ω output impedance; binding post connector on rear panel.
logger output(B）	1 mAFull-scale current output; DC coupled,10 kΩ output impedance; binding post connector on rear panel.

Optional accessories

449-2sound output	This option is for449Supplement to regular specifications.
sound output	Variable frequency sound is provided through speakers mounted within the enclosure; frequencies range from0Arrive500 Hzincrements, corresponding to proportional instrument deflection.
sound threshold	1The circle control renders the sound output silent until the input frequency does not exceed the control setting and makes the output audible at all higher frequencies; ranges from selected linear and logarithmic full scales0Arrive100％。
sound volume	1The circle control adjusts the amplitude of the sound output from a nearly inaudible level to a level audible under normal laboratory ambient noise.

electrical and mechanical

Required power supply	+24 V, 50 mA; –24 V, 35 mA; +12 V, 30 mA; –12 V, 45 mA。
weight	Net weight 1.5Kilogram (3.5pounds). Shipping weight 2.5Kilogram (5.5pounds).
Size	NIMStandard double wide module,6.90 X 22.13cm (2.70 X 8.714inches), consistent withDOE/ER-0457Trequirements.

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Model

Description

449

Log/LinCount rate table

449-2

with sound outputLog/LinCount rate table

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Model	Description
449	Log/LinCount rate table
449-2	with sound outputLog/LinCount rate table

449/449-2 Log/Lin Count Rate Table

449/449-2 Log/Lin Count Rate Table

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