IL1700 Research Radiometer
![[ IL1700 Research Radiometer - 31 KB ]](il1700.gif)
IL1700 Research Radiometer
The IL1700 Research Radiometer is the most versatile current measurement instrument in the world. Designed specifically to measure photodetector currents, the IL1700 maintains unmatched linearity over a 10 billion to 1 dynamic range.The IL1700 achieves this incredible dynamic range through the use of a proprietary front end amplification system. First, the floating, current-to-current amplifier boosts the photoconductor current directly, without the constant gain changes that compromise linearity in transimpedance amplification schemes. The amplified current signal is then integrated over a period of 0.5 seconds and measured as a charge (instead of an instantaneous voltage, as in the transimpedance scheme). This boosts the signal-to-noise ratio by orders of magnitude, for additional low-end range. A full blown 8 bit computer analyzes the incoming data in real time, providing updated D.C. signal readings every 1/2 second.
Because of its unique current measurement circuitry, the IL1700 is the only radiometer in the world that can autorange during exposure integrations, over its entire 10 decade dynamic range! Expansive data registers allow dose integrations spanning a 40 decade range and lasting up to 18 years! Naturally, we also provide automatic ranging in the D.C. direct measurement mode, along with a useful auto-range ON/OFF button for fixed range selection.
Our automatic zeroing feature is complemented by an automatic 100 % function for simple measurements in percentages of the measured maximum, or as differential measurements expressed in percent change.
The IL1700 comes complete with a N.I.S.T. traceable electrical calibration. Since this calibration is independent of the detector's N.I.S.T. traceable optical calibration, detectors can be exchanged between instruments or even purchased at a later date without any loss in calibration accuracy. The IL1700 also maintains 10 calibration factors in constant memory, for easy, fast detector changes.
Multiple power selection (115/230 VAC, 8-15 VDC, or battery power with built-in recharger), two computer interfaces (RS232C and TTL), an analog recorder output (0-1 volt), and a rugged carrying case are all standard features.
The capability for remote computer control of the four primary operating functions provides added versatility. The 'ZERO', 'D.C.', 'INT', and 'HOLD' buttons can be selected by computer, for remote, unattended data logging. When coupled with the A415 Detector Multiplexer, the IL1700 and up to 8 detectors (16 with a second multiplexer) can be controlled, selected and read remotely by computer.
The IL1700 maintains complete compatibility with a multitude of different detectors, attenuators, filters, and diffusers. All IL detectors, filters and input optics may be integrated with the IL1700 system. The programmable factors make all detectors read directly in the final optical units.
We also now offer the IL1800 Lock-In Radiometer for applications requiring synchronous chopped detection in high ambient measurement conditions. The IL1800 offers the same features and measurement prowess of the IL1700, with the addition of chopper driver and phase zeroing circuitry.
The 'ZERO' button nulls the ambient signal to zero. The 'D.C.' button selects direct measurement mode. The 'INT' button selects light dose integration mode. The 'HOLD' button freezes the display and sends data to the optional printer. The 'AUTO RANGE' button selects either automatic or fixed range. The 'AUTO 100%' button sets the displayed signal to 100 percent. The '5 V BIAS' button provides an additional 5 volt reverse bias for flash integrations and for all vacuum photodiode detectors. The 'DATA/FACTOR DISPLAY' button selects either detector output or sensitivity factor display. The 'FACTOR SELECT' button increments through the 10 sensitivity factor memory registers. The 'MSD', 'LSD' and 'EXP' buttons allow the user to adjust the sensitivity factor. The 'POWER' button turns the power on/off. An AUTO SHUT-OFF feature automatically turns off the instrument if idle for more than 10 minutes in battery mode. 'BAT' and 'AC' LED's indicate the power source, with low battery warning. The 'CHG' LED indicates batteries recharging.
The 'OUTPUT RECORDER/TTL' port allows simultaneous autoranging analog recorder output (0-1 volt) and TTL digital data (0-5 volts). The 'AC VOLTAGE' switch selects 115 or 230 VAC. The 'COMPUTER/PRINTER' switch configures the standard 'RS232C DIGITAL OUTPUT' connector to match DTE or DCE equipment. The 'SOURCE AC/BAT' switch selects AC or battery power. The '90-130/180-240 VAC' power input plug accepts the provided AC power cable. The detector cable plugs into the 'SENSOR INPUT', which also provides voltages of +15 V, 5 V, and -9 V for various sensor probes. The 24 line, card edge connector labeled 'ACCESSORY INPUT' allows various input/output functions: auxiliary power input, recorder output, RAM voltage check for constant memory, and remote operation of 'ZERO', 'D.C.', 'INT', and 'HOLD' functions.
Dynamic Range: 2 x 10-13 to 2 x 10-3 A.Min. Resolution: 0.01 x 10-11 Amperes.
Linearity: ±0.1%, top 8 decades; ±0.2%, ±1 digit, bottom 2 decades.
Display: 3 1/2 digit + 1 1/2 digit exp.
Display Range: 1.000 x 10-19 to 9.99 x 10+19 display units.
Input Impedance: Virtual Ground (op-amp summing node).
AC Power: 90-130 / 180-240 V, 50-400 Hz.
DC Power: 8-15 V external, or 6 internal 'C' cells.
Max Power: 11 Watts.
RS232C Output: DTE or DCE, ± 8 V.
TTL Output: 0 to 5 V.
Recorder Output: 408 W impedance, 100 to 1000 mV, ranging every decade, current limited, 1/2 sec.
Size: 90 mm x 220 mm x 240 mm (3.5" x 8.7" x 9.4").
Weight: 2.3 kg (5.1 lbs.).
