Rk-5700
Series Power Meter
Meter
The Rk-5700 Series Power Meters accept a wide
variety of probes - pyroelectric, silicon, andthermopile - enabling them to perform absolute
radiometry, total laser power (cw and average), andirradiance measurements from the UV to far-IR, pW
to kW. Integrated lock-in amplifier circuitry allows
for synchronous detection of chopped opticalsignals, improving both S/N ratio and backgroundre j e c t i o n . T h e d u a l c h a n n e l R k - 5 7 2 0
simultaneously measures Channel A, Channel B,and the ratio B/A. An IEEE-488 GPIB computerinterface, Analog Outputs, Background Cancel,and Autorange are all standard features.

" pW to kW; UV to Far-IR" Single and Dual Channel" Synchronous Detection" GPIB Computer Interface

23 WELLS AVE.

·UTICA,NY 13502 ·The Rk-5700 Series Power Meters feature a highcontrast, backlit, alphanumeric LCD display, dualuse numeric/function keys, and power switch. The
Rk-5710 single channel instrument continuously
shows the Channel A power in engineering
notation, along with a digital bargraph. An
enunciator indicates whether the instrument is in
local or remote (GPIB enabled) mode. In addition,
the Rk-5720 dual channel instrument shows theChannel B power in engineering notation and theB/A ratio. The power can be displayed in absolute
units (Watts) or relative units (dBm).
Connecting an RkP-500 Series probe and opticalchopper to an Rk-5700 Power Meter activates thesynchronous detection feature. Synchronous
detection requires two signals, an optical signal andan electrical reference signal. The optical signal isgenerated by light striking the RkP-500 Series probe
after it has passed through the optical chopper. Thechopper itself generates the reference signal. The
advantage of synchronous detection is that theinstrument will selectively measure only the opticalsignal with the same frequency as the reference
signal, and ignore all other optical signals. By
positioning the chopper so that only the desired
optical source is chopped virtually all background
PHONE 315 797-4492·FAX 315 797-0696

noise can be eliminated, insuring maximum S/N ratio.
With this technique it is possible to measure a signal levelthat is smaller than the background.

Other useful functions include Autorange, which allows
the instrument to automatically track a signal that isfluctuating over a wide power range. Fast Averaging sets
the low-pass filter time constant to 1 second for morestable sources; Slow Averaging (10 sec) integrates over alonger period to give a better measure of the average
power for a noisier source. Calibration Factors (one perchannel) can be entered to compensate for non-linearity
in the optical path, such as transmission loss through afilter or the wavelength response of a non-flat probe. The
measured power is divided by the Calibration Factor andthe corrected power is displayed.
Rear panel connectors for the Rk-5710 include thepower entry module, Probe A, GPIB, Sync In, andAnalog Out. The Rk-5720 also has Probe B, A Out and B
Out, and replaces Analog Out with Ratio Out. The
power entry module accepts a standard line cord andhas a switchable 110/220 VAC card. The Sync In accepts
a TTL reference signal for synchronizing the instrument
to an external chopper (30 Hz, 50% duty cycle, 180° outof phase with the chopped optical signal).
Analog Out, A Out, and B Out are 0 - 10 VDC, with 10 V
corresponding to full scale in both linear (Watts) andlogarithmic (dBm) mode. In linear mode the Ratio Out is0-10 VDC where the voltage equals the mantissa; in log
mode it is -10 V to +10 V, representing -100 dBm to+100 dBm. The IEEE-488 GPIB computer interface
outputs in ASCII format the power in Watts (engineeringnotation) or dBm. For the Rk-5720 the Ratio B/A is alsoavailable in linear (scientific notation) or logarithmic(dB) format. All outputs update with the front panel
display at 3 Hz.
The Rk-5700 Series instruments are compatible with theRkP-500 and RkT Series probes. Contact the factory for
additional information regarding probe compatibility
and available options.

Resolution
Ratio range
Ratio accuracy
Calibration factor
Response time
Background subtract
Chopping frequency
Accuracy
Analog Out, A Out,and B Out
Ratio OutGPIB
Power supply
Temperature range
Dimensions (l x w x h)
Weight0.005% of F.S. (RkP-500 Series)
0.03% of F.S. (all other probes)
1015 to 1 (probe dependent)± 2 LSD
0.100 to 1.000
1.0 sec, 10 sec
Up to Pmax of probe
30 Hz ± 0.1 Hz; 50% duty cycle± 0.5%
0 - 10 VDC, 10 V equals F.S. for linear(Watts) and logarithmic (dBm) mode0 - 10 VDC, proportional to mantissa or-10 to +10 VDC, proportional to -100 to+100 dBm
Talker/Listener; Address 0-30;
Terminator LF/CR
120/240 ±10% VAC; 50-60 HzOºC to 40ºC operating; -20ºC to 70ºC
storage30.6 cm x 26.3 cm x 10.1 cm(12.1" x 10.4" x 4.0")
4.1 kg (9.0 lb)

SPECIFICATIONSThe Background Cancel function is particularly usefulfor non-chopped probes that cannot take advantage ofsynchronous detection. When enabled it measures andstores the background power level, then subtracts it fromall subsequent measurements leaving only the source
power to be displayed.

The Rk-5700 Series instruments are provided with acertificate of calibration showing traceability to theNational Institute of Standards and Technology(NIST) and compliance with MIL-45662 and ANSIZ540 Sections 7-18.

12.040

4.000

4.625

1.390

2.275
9.790

10.345

As a result of our ongoing commitment to product improvement specifications are subject toREV 019801js
change without notice.