Spectronics DM-254XA, DM-300XA, DM-254HA, DM-300HA, DM-365XA Operator's Manual

OPERATOR’S MANUAL

DMXA-Series and DMHA-Series

Digital Radiometers

®

Manual No. 84087-8

Printed in U.S.A. Issued: July 2004

Recycled
Paper

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Congratulations on choosing a Spectroline®DMXA-Series or DMHA-Series
digital radiometer. Spectronics Corporation has designed it to provide
the most desirable features, the best performance and, when used prop­erly, years of trouble-free operation. Please read the instructions in this
manual carefully before using the unit.

SECTION I INTRODUCTION

1.1 GENERAL

The Spectroline DMXA-Series and DMHA-Series digital radiome­ters provide readings from 0-19,990 µW/cm

2

or 0-199.9 mW/cm

2

(0-199,900 µW/cm2), respectively. They feature an easy-to-read LED
display. Their overall accuracy is better than ±5%.

These radiometers use high-quality interference filters that exhibit
accurate and carefully controlled spectral coverage, practically
eliminating unwanted meter sensitivity to infrared interference and
other undesirable radiations. This allows the readings to be obtained
directly instead of by calculation, a time-consuming and error­producing procedure required by certain competitive devices. The
interference filters also minimize the “solarization” effect upon the
response of the meters over time.

All Spectroline radiometers are calibrated to NIST standards by pyro­electric methods for maximum accuracy. They are designed with a
low electrical impedance, making their linearity vastly superior to
that of any other comparably priced radiometers. The sensor heads
are provided with a special diffuser-sensor window that ensures
accurate Lambertian or Cosine response.

The metering electronics of the DMXA-Series and DMHA-Series
radiometers feature better than ±5% accuracy, integrated circuitry,
and solid-state LED display. Additional features of the electronics are
excellent temperature and over-ranging characteristics. The DMXA­Series and DMHA-Series radiometers also have built-in autozeroing.

1.2 FEATURES

1.2.1 The Spectroline DMXA-Series and DMHA-Series digital radiome-

ters are pocket-sized, battery-operated units suitable for use in the
measurement of 254nm, 300nm, 365nm or 450nm wavelengths.

1.2.2 The radiometers feature nonrechargeable and rechargeable
options. With the nonrechargeable option, the meters require four
‘‘AA’’ 1.5 volt, alkaline batteries. With the rechargeable option,
the meters require four ‘‘AA’’ 1.25 volt, nickel-cadmium batteries
and the Spectroline Model DM-15C0001 battery charger (separately
available).

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1.2.3 The radiometers measure irradiances as specified in Table 1-1.
The sensor generates electrical current proportional to the irradiance
experienced at a plane defined by the face of the sensor.
Amplification and current-to-voltage conversion circuitry are con­tained within the hand-held display unit and its integrated nature
provides high reliability and accuracy in the readings.

1.2.4 The numerical display is a light-emitting diode (LED) for precise
reading in even total darkness. The numerals are 0.5 inch (12.7mm)
high and in a single plane for distant and wide-angle viewing.

1.3 ACCESSORIES AND REPLACEMENT PAR TS

All accessories and replacement parts required for the operation of
the radiometers are listed in Table 7-1.

1.4 TECHNICAL DATA

Table 1-1 lists all the technical specifications for the radiometers.

SECTION II INSTALLATION

2.1 UNPACKING AND INSPECTION

2.1.1 Unpack and inspect the radiometer for possible damage in

shipment. Check the perfor mance as soon as possible. If damage is
noted, notify the carrier and supplier before using the instrument.
Also check that all items are included.

2.1.2 Save the shipping carton and packing materials for future
storing or shipping of the radiometer.

2.2 POWER SOURCE REQUIREMENTS

The radiometer is battery operated. The batteries are factory
installed in the instrument.

WARNING

This radiometer is carefully designed to prevent accidental shock to
the operator when properly used. However, no engineering design
can render safe an instrument which is used carelessly. Therefore,
recommendations presented in this manual must be read carefully
and thoroughly understood before any measurements are made.

Failure to follow directions could result in serious adverse effects.

Also, certain models are designed for use in regions of the spectrum,
notably the ultraviolet range, which may be hazardous to the eyes
and/or skin of individuals. Ultraviolet protective eyewear (UVS-30
spectacles or UVG-50 goggles) and facewear (UVF-80 face shield)
are obtainable from Spectronics Corporation.

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2.3 INSTALLATION

The radiometer may be operated in any position without compro­mising accuracy. The sensor probe may also be positioned at any
angle.

TABLE 1-1 TECHNICAL DATA

1.Readout Unit

Irradiance Range

DMXA-Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0-19,990 µW/cm

2

DMHA-Series . . . . . . . . . . . . . . 0-199.9 mW/cm2(0-199,900 µW/cm2)

Resolution

DMXA-Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 µW/cm

2

DMHA-Series. . . . . . . . . . . . . . . . . . . . . . . 0.1 mW/cm2(100 µW/cm2)

Display

DMXA-Series. . . . . . . . . . . . . . . . . . . . . . . . . 4

1

⁄2digit, 7 segment, LED

0.5 inch (12.7mm) high

DMHA-Series . . . . . . . . . . . . . . . . . . . . . . . . 3

1

⁄2digit, 7 segment, LED

0.5 inch (12.7mm) high

Conversion Rate. . . . . . . . . . . . . . . . . 3 readings per second nominal

Overall Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Better than ±5%

with reference to NIST standards

Temperature Coefficient . . . . . . . . . . . . . . . . . ±0.025%/°C (0 to 50°C)

2.Sensor

Spectral Ranges

DM-254XA, DM-254HA . . . . . . . . . . . . . . . 230-280 nanometers (nm)

DM-300XA, DM-300HA . . . . . . . . . . . . . . . 280-320 nanometers (nm)

DM-365XA, DM-365HA . . . . . . . . . . . . . . . 320-400 nanometers (nm)

DM-450XA, DM-450HA . . . . . . . . . . . . . . . 420-480 nanometers (nm)

Temperature Coefficient . . . . . . . . . . . . . . . . . . ±0.20%/°C (0 to 50°C)

3.Power Requirements

Battery Operation

Four nonrechargeable ‘‘AA’’ size alkaline battery cells are included
as standard.

Four rechargeable ‘‘AA’’ size nicad battery cells and a battery
recharger are available as an option.

4.Reference Conditions . . . . . . Specified on Certificate of Calibration.

5.Dimensions

Readout Unit

Length . . . . 7.25 in (18.4cm) Width . . . . . . . 3.50 in (8.9cm)

Thickness. . . . . . 2 in (5.1cm) Weight . . . . . . . . 1 lb (0.45kg)

Sensor

Length . . . . . . . . 3 in (7.6cm) Width . . . . . . . . . . 2 in (5.1cm)

Thickness. . . . 0.70 in (1.8cm) Weight . . . . . . .

1.25 oz (35.4g)

Sensor Cord Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ft (0.6m)

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SECTION III CONTROLS, CONNECTORS AND INDICATORS

3.1 GENERAL

All operating controls, connectors and indicators are described in
Table 3-1. Become familiar with each item prior to operating the
radiometer for the first time.

TABLE 3-1 FRONT AND BACK PANEL DESCRIPTION

1. Power Switch: With the dual-operation toggle switch flipped to
the ‘‘POWER ON’’ position, the radiometer will
remain activated until manually turned off. The
meter will also operate when the switch is held in
the ‘‘MOMENTARY’’ position, but the switch will
automatically return to the ‘‘OFF’’ position once
pressure is released.

2. Numerical Display: The digital display uses LEDs and includes a ‘‘1’’
digit and 7-segment type 0-9 digits. The last digit is
permanently set at ‘‘0.’’ Over-range (or out-of­range) condition is indicated by a blank display,
except for the most significant ‘‘1.’’

3. Retractable Cord: This coil cord connects the sensor to the readout
unit.

4. Charger Jack: Use only with rechargeable battery cells. Any
other type of cell may produce hazardous condi­tions and may damage the instrument.

5. Sensor Window: Sapphire diffuser to ensure good cosine response.

6. Battery Level When lighted, green LED indicates that battery

Indicator Light level is adequate.
(Not Illustrated)

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