Measuring Modes CNT-66
Frequency
Freq.A: 0.1 Hz to 160 MHz
Freq. C: 70 MHz to 1.3 GHz
Resolution: 7 digits in 1s measuring time
Period A
Range: 8 ns to 2x108s
Resolution: 100 ns (Single) or 7 digits in 1s (Average)
Ratio A/B, C/B
Range: 0 and 1x10-7 to 2x109(A/B)
0 to 1x1015 (A/B Single)
8 to 6x1010 (C/B)
Time interval A-B)
Range: 100 ns to 2x108 s (Single)
0 ns to 20 s (Average)
Resolution: 100 ns / √N
Number of Intervals averaged N: N=Measuring time / Signal repetition rate.
Min dead time from stop to start: 250 ns
Totalize A
Range: 0 to 1x1015 (0 Hz to 16 MHz)
Modes: Counting onA, gated by B signal OR started/stopped
by B signal OR manually controlled by START/STOP
button.
Volt Max/Min A
Range: -5.1V to +5.1V / -51V to +51V
Frequency range: DC; 100 Hz to 50 MHz
Resolution: 20mV / 200 mV
Measuring Modes CNT-69
Frequency A or B, Period A See specs for CNT-66
Totalize A See specs for CNT-66 (only manual gating)
Frequency A/Ao and A- Ao The Freq.A value is divided by, or subtracted with,
the constantAo before display.
RPM A Display value = Freq. A value x 60
Range: 6 RPM...720x106RPM
Width A
Range: 100 ns...2x108s
Resolution: 100 ns (always Single)
Input A and Input B CNT-66
Frequency range: DC to 160 MHz
(120 MHz to 160 MHz with limited temperature range; typ. +23 °C ± 5 °C)
Coupling: DC orAC (-3dB at 20 Hz sine)
Max. sensitivity 20 mV rms, 0 Hz to 30 MHz
40 mV rms, 30 MHz to 120 MHz
60 mV rms, 120 MHz to 160 MHz
Sensitivity is selectable in 1-2-5 steps from 20 mV
through 1V rms; nominal (LF-signals)
Impedance: 1 MΩ//35 pF
Attenuation: x1 or x10, orAUTO
Max.Voltage without damage:
350V (DC+AC peak) between 0 and 440 Hz, falling to
8V rms at 1 MHz.
Triggering
Trigger level range (x1 attenuation):
DC: +5.1V to –5.1V, 20 mV resolution
AC: 0 V fixed or AUTO level.
Uncertainty: ± 10 mV ± 1 % of setting
AUTO level: Set to 50 % of input signal amplitude.
Frequency range: >100 Hz
Trigger indicators: Tri state LED;
Trigger slopes: Positive or negative.
Input-A CNT-69
Frequency range: 10 Hz to 160 MHz
(120 MHz to 160 MHz with limited temperature range;
typ. +23 °C ± 5 °C)
Impedance: 1 MΩ// 30 pF; AC-coupled
Max. Sensitivity 10 mV rms, 10 Hz to 120 MHz
30 mV rms, 120 to 160 MHz
Attenuation: Continuously variable in two ranges
between x1 and x400
Filter: 50 kHz low pass noise filter
Max. voltage without damage:
350V (DC + AC peak) between 0 and 440 Hz, falling to
11 rms at 1 MHz.
Trigger levels: 3 fixed levels: symmetrical, high/low duty factor and
AUTO (repetition rate > 100 Hz)
RF Input 1.3 GHz
Freq. range: 70 MHz to 1.3 GHz
Coupling: AC
Operating input voltage range:
10 mV to 12V rms, 70 MHz to 900 MHz
15 mV to 12V rms, .0.9 to 1.1 GHz
40 mV to 12V rms, 1.1 to 1.3 GHz
Impedance: 50Ωnominal,VSWR <2:1
Max. voltage without damage: 12 Rms, PIN diode protected
Auxiliary functions
Measuring time: 0.2s, 1s, 10s or Single
Blank digits (CNT-69 only): Blanking least significant display digits, to hide
unstable digits on the display
External reference input D
Input: 10 MHz ± 0.1 MHz, >500 mV rms
Max input voltage: 15V rms
GPIB interface (Option 04)
Programmable device Functions for:
CNT-66:Full GPIB programmability
CNT-69: All front panel settings except Sensitivity and Filter
Max Data Output Rate:
Normal Mode: Approx. 5 readings/s
High-Speed Dump: Approx. 100/s.
General
Line voltage: 115 / 230V; 46 to 440 Hz, (<24 VA incl. all options).
Safety: EN61010 Cat II, pollution degree 2; CSA 22.2; CE
EMC: EN55011, group 1, class B; EN50082-1; CE
MTBF: 70000h (CNT-69), 50000 h (CNT-66)
Mechanical Data
WxHxD: 186x88x270 mm
Weight: CNT-66 Net: 2.4 kg, Shipping: 3.2 kg
CNT-69 Net: 2.1 kg, Shipping: 3.0 kg
Temperature: Operating: 0° C to +50° C
Storing: -40 °C to +70° C
Time base Oscillators
Standard crystal
Aging: < 5x10-7/month; 5x10-6/year
Temp. 0 to 50°C: < 1x10-5
Total uncertainty (2σ): - 1 year after calibration < 1.2x10-5
- 2 years after calibration < 1.5x10-5
MTCXO (option 07).
Aging: < 1x10-7/month; 5x10-7/year
Temp. 0 to 50°C: < 2x10-7
Total uncertainty (2σ): - 1 year after calibration < 6x10-7
- 2 years after calibration < 1x10-6
Ordering information
CNT-66: Basic timer/counter 1.3 GHz, standard time base
CNT-69: Basic frequency counter 1.3 GHz, standard time base
Opt. 04: GPIB interface
Opt. 07: MTCXO time base
Included with Instrument
Operators manual
Calibration certificate
Optional accessories
Option 05: 19” rack mount kit
Option 09: Carrying case
Specifications subject to change without notice
Pendulum Instruments AB
www.pendulum.se
– experts inTime & Frequency Calibration, Measurement and Analysis
CNT-66 and CNT-69 Specifications
4031 600 66101- rev. 02 January 2001
