Timer Counters CNT-81 & CNT-81R
Contents
1. resolution better than 0 01 below 30 MHz This gives you outstanding resolution in measurements like laser positioning and calibration of phase meters Calibration pro cedures exist that provide outstanding accu racy with an uncertainty below 0 1 Ideal for fast test systems In manufacturing test systems two things are important EMC immunity and speed CNT 81 offers excellent EMC shielding and the highest throughput for any commercially available counter The speed is impressive i 8000 s to internal memory and 250 s for indi vidually triggered measurements via GPIB Up to 20 complex measurement set ups can be lo cally stored in the counter s non volatile set up memory and instantly recalled via a short bus command This enables new measurement tasks to be executed one after the other at a very high rate A complete cycle setup measure transfer takes less than 8 ms The two counters comply of course to SCPI which facilitates easy updating of new test hardware without the penalty of time consum ing SW rewriting pendulum c Incorporating XL Microwave Modulation Domain Analysis The analysis PC SW TimeView converts the CNT 81 CNT 81R to a high performance mod ulation domain analyzer In the modulation do main you can view rapid frequency changes vs time e g modulation sweep freqiency setting channel hopping etc The 16 bit DOS program is standardly included with all CNT 81 81R2. The 32 bit Windows program is an optional ac cessory option 29 Frequency qJ Figure 1 The modulation domain f vs t complements the time V vs t and the frequency V vs f domains Figure 2 Jitter rms and peak peak and noise is quantified in distribution histograms Figure 3 The FFT diagram reveals the modu lation frequency whether intended or un wanted OCE EI CERI M E d i E SLEE Figure 4 Linearity of frequency sweep can be verified in the modulation domain frequency vs time Figure 5 Repetitive samplings gives an effec tive sampling rate of 10 Msa s This VCO has a frequency switching time of approx 10 7 us dee Figure 6 The 9 different pulse width clusters corresponding to the 9 different pit lenghts T3 T11 in a CD recording gt je me x Figure 7 Zoom in on T3 cluster displays an rms jitter of 13 ns which is OK for an audio CD CNT 81 amp CNT 81R Specifications Measuring Modes Inputs A and B can be swapped internally in all modes except Rise and Fall Time Frequency A B C Range Input A Input B Input C option 20 Input C option 13 Resolution Frequency Burst A B C up to 300 MHz up to 100 MHz 100 MHZ to 2 7 GHz 300 MHz to 8 GHz 11 digits in 1s measuring time Frequency and PRF of burst signals down to 1us CH A and B or 50 us Ch C can be measured without external control signals P
3. Heavy Duty Hard Transport Case TimeView for Windows 98 2000 XP NT Operators Manual printed for CNT 81 81R Programmers Manual printed for CNT 81 81R Service Manual printed for CNT 81 81R GPIB USB interface from National Instruments PCMCIA GPIB interface from National Instruments GPIB ENET interface from National Instruments GPIB cable type X2 1m from National Instruments GPIB cable type X2 2m from National Instruments GPIB cable type X2 3m from National Instruments 18 months Extended to 3 years Extended to 5 years Options are factory installed upon order and can not be customer retrofitted After 1 month of continuous operation US Pendulum Instruments Inc 5811 Racine Street Oakland CA 94609 1519 USA Voice 510 428 9488 Fax 510 428 9469 Specifications subject to change without notice International Pendulum Instruments AB PO Box 20020 SE 16102 Bromma Sweden Voice 46 8 598 51057 Fax 46 8 598 51040 WAAL AAA AAAA aA AN T PPT PAY 4031 600 80101 rev 05 August 2006 Pendulum Instruments www pendulum instruments com Experts in time amp frequency calibration measurement and analysis pendulum 2 Incorporating XL Microwave
4. Optional Accessories Ageing Option 11 per month lt 5x107 lt 1x10 lt 3x10 lt 5x10 Option 22 per year lt 5x10 lt 7 5x108 lt 2x108 lt 2x10 Option 27 per 10 years n s n s n s lt 1x10 Option 27H Option 29 vs temp OM 81 0 C 50 C lt 1x10 lt 5x10 lt 2 5x10 lt 3x10 PM 81 20 C 26 C typ lt 3x10 lt 6x10 1 lt 4x107 lt 2x107 SM 81 Short Term NI 778416 01 NI 778034 0 t 1s Allan Dev n s 1x10 5x10 5x10 NI 778209 0 Warm up Stability n s lt 1x108 lt 5x10 lt 4x10 NI 763061 01 after warm up time of 30 min 10 min 10 min 10 min NI 763061 02 NI 763061 03 Total Uncertainty 20 Warranty 20 C 26 C Standard 1 year after calibration lt 7x10 lt 1x107 lt 2 5x10 lt 2 5x107 Ononi 2 years after calibration lt 1 2x10 lt 2x107 lt 5x108 lt 5x107 ee Option 95 05 Timer Counter Analyzer 300 MHz 50 ps incl Standard timebase 5x10 Month and Time amp Frequency Software TimeView for DOS Timer Counter Calibrator 300 MHz 50 ps incl Rubidium timebase 5x107 Month and Time amp Frequency Software TimeView for DOS Power line cord Users documentation on CD rom Certificate of Calibration 8 0 GHz Input C CNT 81 81R 2 7 GHz Input C CNT 81 81R Very high stability Oven Time Base 1x10 Monat Ultra high stability Oven Time Base 5x10 Month Rear Panel Inputs Rack Mount Kit Carrying Case
5. and wait for a second Each individual 1s measurement has a 5x107 resolution The built in statistics av eraging improves resolution further and the std dev indicator gives added information about the stability of the unknown fre quency Time Interval calibration For the calibration of time intervals the CNT 81 provides leading performance due to the fast 50 ps single shot time resolution 1 ps averaged and the high trigger level resolution of 1 25 mV The systematic start stop channel difference is only 500 ps which can be further reduced by calibrating the input channel difference Phase calibration With CNT 81 you can measure phase differ ences on signals of up to 160 MHz with a WMI AAA NAA b IU MAANA Ml OV VY TTP TAYU ANATA yyy Selection Chart CNT 81 CNT 81R Frequency burst time interval phase Vp p e e Frequency range standard 300 MHz 300 MHz Frequency resolution 1s gate time 11 digits 11 digits Time interval resolution single average 50 1 ps 50 1 ps Vp p and trigger level resolution 1 25 mV 1 25 mV Arming Hold off delay by time and events e e Hold off resolution 10 ns 10 ns Best timebase stability month 3x10 5x10 No of 10 MHz 5 MHz reference outputs 1 0 6 1 Measurement speed GPIB 250 s 250 s to internal memory 8 k s 8 k s Statistics calc mean std dev and max min Time View Documenting and Analysis SW e e 2 7 GHz HF input Option 10 Option 10 8 GHz RF input Option 13 Option 13
6. 3 GHz 0 3 to 2 5 GHz 2 5 to 2 7 GHz Impedance Max Voltage Without Damage Connector Input C Option 13 Operating input voltage range 0 3 to 0 5 GHz 0 5 to 3 0 GHz 3 0 to 4 5 GHz 4 5 to 6 0 GHz 6 0 to 8 0 GHz Impedance Connector 100 MHz to 2 7 GHz 20 mV rms to 12V rms 10 mV rms to 12V rms 20 mV rms to 12V rms 50Q nominal VSWR lt 2 5 1 12V rms during 60s PIN diode protected N type female 21 to 30 dBm 20 mV rms to 7V rms 27 to 30 dBm 10 mV rms to 7V rms 21 to 30 dBm 20 mV rms to 7V rms 15 to 30 dBm 40 mV rms to 7V rms 9to 30 dBm 80 mV rms to 7V rms 50Q nom VSWR lt 2 1 N type female Rear Panel Inputs and Outputs Reference Input Reference Output CNT 81 CNT 81R Arming Input Gate Output Trigger Level Outputs Probe Comp Outputs Analog Output 1 2 5 or 10 MHz gt 200mV rms 1x10 MHz gt 0 5V rms sinewave into 50Q load 6x10 MHz 1x5 MHz gt 0 6V rms sinewave into 50Q load Most mesuring functions can be performed using arming Gate open gate closed signal Outputs for channel A and B trigger levels Outputs for channel A and B to adjust for best pulse response when using probes for counter inputs 0 to 4 98V in 20 mV steps proportional to 3 se lected display digits Auxiliary Functions Trigger Hold Off Time Delay Range Event Delay Range B External Arming Time Delay Range B E Event Delay Range B Statistics Functions Sam
7. Up to 10 MSa s Back to back Period Up to 40k readings s Waveform Capture Instrument Control Yes vertical sampling All front panel functions and some AUX General Specifications Environmental Data Operating Temp Storage Temp Safety EMC 0 C to 50 C 40 C to 70 C CSA 22 2 Nr 231 EN 61010 1 Cat II pollution degree 2 CE EN 5501 1 ISM Group 1 Class B EN 50082 2 FCC Part 15J Class A CE Power Line Requirements at 25 C AC Voltage CNT 81 CNT 81R Power Rating CNT 81 CNT 81R Mechanical Data WxHxD Weight CNT 81 CNT 81R 90 to 265V rms 45 to 440 Hz 90 to 265V rms 45 to 440 Hz Max 35W Max 100W 6 min warm up Max 47W cont operation 315x86x395 mm 12 4x3 4x15 6 in Net 4 kg 8 5 Ib Shipping 7 kg 15 Ib Net 4 8 kg 10 5 Ib Shipping 7 8 kg 16 8 Ib Ordering Information Basic models MENU functions CNT 81 Data Analysis Measurement data vs time FFT Graph CNT 81R Root Allan Variance Smoothing function o function Included with Instrument ursor measurements Distribution Histogram File Storage Setup and Measurement data RF Input Frequency Depending on measurement function and internal data format Options CNT 81 81R Option 13 Option 20 Time Base Options Tine Base Options CNT 81 Option 30 Model _ CNT 81 CNT 81 CNT 81 CNT 81R Option Standard Option 30 Option 40 CPUT Stability UCXO OCXO OXCO Rubidium
8. eriod A Range Resolution Frequency Ratio A B C B Range Time Interval A to B Range Resolution Single shot Pulse Width A Range Rise and Fall Time A Range Phase A Relative B Range Resolution Duty Factor Range Totalize A B Range Modes V max V min Vp p A B Range Frequency Range Resolution 3 3 ns to 10 s 11 digits in 1s measuring time 10 to 10 0 ns to 10 s 50 ps 1 ps average 3 ns to 10 s 3 ns to 10 s 180 to 360 0 01 0 000001 to 1 000000 0 to 101 0 to 10 in A B modes A Gated by B A Start Stop by B Manual gating A minus B Time gating A minus B 50V to 50V up to 100 MHz 1 25 mV Inputs and Outputs Inputs A and B Coupling Impedance Max Channel Timing Difference Max Sensitivity Attenuation Var Hysteresis A Triggerpegel Range Resolution x1 AUTO Trigger Level Min Frequency Low Pass Filter A Digital LP Filter AC or DC 1 MQ 15 pF or 50Q VS WR lt 2 1 500 ps 20 mV rms lt 100 MHz xlor x10 30 mVp p to 10Vp p hup to 120 MHz read out on display x1 5V to 5V x10 50V to 50V 1 25 mV Trigger level is automatically set to 50 point of input signal 10 and 90 for Rise Fall Time 75 and 25 for variable hysteresis A Settable from 1 Hz and upwards Default 100 Hz 100 kHz 1 Hz to 10 MHz using trigger Hold Off Input C Option 20 Frequency Range Operating Input Voltage Range 0 1 to 0
9. ple Size Mathematics Functions Other Functions Measure Time Display Hold Set ups Display 60 ns to 1 34s 10 ns resolution 2 to 2 1 max 100 MHz 200 ns to 1 6s 100 ns resolution 2 to 2 1 max 20 MHz Maximum Minimum Mean and Standard Deviation 1 to 2x10 samples K X L M and K X L M X is urrent reading and K L and M are constants set via keyboard or as frozen reference value X or as value from pre ceding measurement X 1 Single cycle 80 160 320 640 1280 ns and 20 us to 20s to 400s for some functions Freezes measuring result until a new measure ment is initiated via Restart 20 instrument setups can be saved and recalled from internal non volatile memory 10 can be user protected 10 digit LCD with high luminance back light CNT 81 amp CNT 81R Specifications GPIB Interface Max Measurement Rate Via GPIB 250 readings s To Internal Memory 8k readings s Time Stamping 125 ns resolution Back to back Period Up to 40k readings s 100 ns resolution Internal Memory Size Up to 6100 readings Data Output ASCII IEEE double precision floating point TimeView Time amp Frequency Analyse Software TimeView is supported on both CNT 81 and CNT 81R models Versions DOS version Windows 32 bit version Data Capture Modes and Measurement Rate Standardly supported Optional accessory option 29 Free run sampling 8k readings s Repetitive Sampling
10. product data Ultimate Time amp Frequency calibration amp analysis Fast 8000 measurements s High resolution lps time 11 digits s freq 0 001 phase Rubidium stability 0 0001 ppm High trigger resolution 1 25 mV Advanced arming hold off Modulation Domain Analysis SW e EMC immunity for noisy environments Ideal for fast test systems R amp D and calibration laboratoires GHz option for microwave IRF testing CNT 81 amp CNT 81R Timer Counter Calibrators NOW with 8 GHz option and TimeView With the CNT 81 series of counters and analyzers Pendulum now offers the ultimate tools for measurement analysis and calibration of Frequency Time Interval or Phase whether in test systems on the R amp D bench in the calibration lab or out in the field portable calibration The series com prises 2 models the ultra high performance CNT 81 and the ultimate CNT 81R including a built in Rubidium time base reference Frequency calibration The CNT 81 and CNT 81R can directly cal ibrate any application specific frequency up to 8 GHz They are ideal for calibrating e g the timebase oscillator of other instruments like frequency counters and synthesisers The Rubidium timebase of CNT 81R al lows frequency calibration of even the high est possible specified oven oscillators For a total uncertainty of 10 just connect the unknown frequency to the counters input
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