1. Measuring Functions

Display modes

Values/Statistics: Numeric display of Measurement values or Statistics parameters with large digits. Values mode also display auxiliary parameter values (with less resolution).

Time-line/Distribution: All measurements are displayed graphically. Multi-channel graphs are colorcoded. Statistics values are also displayed beneath the graphs.


Measure up to 4 input signals in parallel with 7 ps resolution per timestamp (Period single, Time Interval, Pulse width, Rise/Fall time, Duty cycle, TIE), or 12 digits/s (frequency and period average).

Smart Frequency/Period avg. calculation mode

Basic resolution for frequency and period average is 12 digits in 1s measuring time. Statistics resolution enhancement algorithm (smart mode) gives up to one extra result digit depending on input signal and measurement setting.

Frequency A, B, D, E

Mode: Parallel measurements on up to 4 inputs. Back-to-back, with or without smart calculation

Range: 0.001 Hz to 400 MHz Aux.

Parameter: Vmax, Vmin, Vp-p

Frequency C (option)

Mode: Back-to-back, with or without smart calculation

Range: See input C

Aux. Parameter: Period C

Frequency Ratio (A,B,C,D, or E) / (A,B,C,D, or E)

Mode: Parallel measurements on 2 or 4 inputs.

Range: (10-9) to 1011

Input Frequency: See input A,B,D,E and C

Aux Parameters: Freq 1, Freq 2

Period A, B, C, D, E average

Mode: Parallel measurements on up to 4 inputs. Back-to-back, with or without smart calculation

Range: See the inverse of Frequency specifications

Aux. Parameter:

  • Ch. A, B, D, E: Vmax, Vmin, Vp-p
  • Ch. C: Frequency C

TIE A, B, C, D, E (Option 151)

TIE = Time Interval Error, calculated as: Accumulated period – Expected (“ideal”) accumulated period

Mode: Parallel measurements on up to 4 inputs. Back-to-back.

Freq range: See Frequency specifications

Aux. Parameter: Ref Frequency

Period A, B, D or E single

Mode: Parallel measurements on 1 or 2 inputs.

Range 2.5 ns to 1000 sec.

Aux. Parameter (A, B): Vmax, Vmin, Vp-p

Time Interval A, B, D, E (single or continuous)

Mode: Parallel timestamping of trigger events on up to 4 channels on continuous or single-shot signals.

Start and stop channel(s): any of A, B, D, E

Note: each input can produce 1 or 2 trigger events with individual trigger level and slope

Accumulated Time Interval: ON or OFF (adding or subtracting one start channel period to the Time Interval, when required)

Range: -1000s to +1000s

Repetition rate: up to 400 MHz or single-shot events

Min. Pulse width: 1.5 ns

Channel-to-channel offset: 100ps rms typ.

Positive and Negative Pulse Width A, B, D, E

Mode: Parallel measurements on 1 or 2 inputs.

Range: 1.5 ns to 1000 sec.

Repetition rate: up to 300 MHz or single-shot events

Resolution: <10 ps per calculated result

Rise / Fall Time A, B, D, E

Mode: Parallel measurements on 1 or 2 inputs of Rise OR Fall time, or

Mode 2: Single input measurement of Rise AND Fall time on the same pulse.

Range: 1.5 ns to 1000 sec.

Aux. Parameters: Slew rate, Vmax, Vmin

Positive and negative Slew Rate A, B, D, E

Mode: Parallel measurements on 1 or 2 inputs

Calculation: (80% of Vp-p) / (Rise or Fall Time)

Aux. Parameters: Slew rate, Vmax, Vmin

Positive and Negative Duty Cycle A, B, D, E

Mode: Single input meaurement

Range: 0.000001 to 0.999999

Repetition rate: up to 300 MHz

Aux. parameters: Period, Pulse width

Phase A Relative B, B Relative A

Mode: Intended for phase shift or delay measurements of two signals with identical frequency

Accumulated Phase: OFF or ON (adding or subtracting 360o to the Phase, when required)

Range: -180° to +180° (Acc. Phase is OFF)

Resolution: 0.00003° to 100 kHz, decreasing to 0.03° >100 MHz. (10k sample statistics averaging)

Freq. Range: up to 300 MHz

Aux. Parameters: Freq (A), Va/Vb (in dB)

Totalize A, B, D, E

Inputs: up to 4 inputs (A, B, D, E)

Mode: Tot A, B, D, E; Tot A+B, D+E; Tot A-B, D-E: Tot A/B, D/E

Range: 1 to 1010 counts

Range: up to 400 MHz

Start control: Manual, start arming

Stop control: Manual, stop arming, timed

Vmax, Vmin, Vp-p A, B, D, E

Range: -5 V to +5 V, -50V to +50V

Freq. Range: DC, 100Hz to 200 MHz

Coupling: Sine (AC or DC), Square (DC only)

Resolution: 1 mV (5V range), 10 mV (50V range)

Uncertainty (5V range):

  • DC, 1Hz to 1kHz: <1% +15 mV
  • 1kHz to 20 MHz sine: 3% +15 mV (typ.)
  • 20 to 100 MHz sine: 10% +15 mV (typ.)
  • 100 to 200 MHz sine: 30% +15 mV (typ.)

(For square waves add 10% to Vmax,/min & 20% to Vp-p) (For 50V range, add 2% + 150 mV)

Aux parameters: Vmin, Vmax, Vp-p

2. Input Specifications

Inputs A, B, D and E

Frequency Range:

  • DC-Coupled: DC to 400 MHz
  • AC-Coupled: 10 Hz to 400 MHz

Impedance: 1MΩ // 40 pF or 50 Ω (VSWR ≤2:1 typ.)

Trigger Slope: Positive or negative

Channel-channel skew: <50 ps (after calibration)

Sensitivity (typical):

  • DC-400 MHz: <70 mVrms (PreAmp =OFF)
  • DC-100 MHz: 15 mVrms (PreAmp = ON)
  • 100-200 MHz: 25 mVrms (PreAmp = ON)
  • 200-400 MHz: 35 mVrms (PreAmp = ON)

Hysteresis window: approx. 20 mV (PreAmp=OFF)

Attenuation: x1, x10

Dynamic Range (x1):

PreAmp = OFF: 0.04 to 10 Vp-p within ±5V window

PreAmp = ON: 0.01 to 2 V p-p within ±1V window

Trigger Level: Read-out in menu

  • Resolution: 1mV
  • Uncertainty (x1): ±(15 mV + 1% of trigger level)

Trigger Level modes: Manual, Relative (to Vp-p), Auto

AUTO Trigger Level set to:

  • 50% point of input signal’s Vp-p, combined with a wide hysteresis between the 40% and 60% points, for frequency, period average, TIE
  • 10% and 90% points, for Rise/Fall Time, Slew
    rate, combined with minimum hysteresis
  • 50% point with minimum hysteresis for all
    other functions
  • Min. voltage 200 mVp-p

Analog LP Filter: Nominal 10 or 100kHz selectable.

Max Voltage Without Damage:

  • 1MΩ: 350 V (DC + AC pk) to 440 Hz, falling to 12 Vrms at 1MHz.
  • 50 Ω: 12 Vrms

Connector: BNC

Input C (Option 10)

Operating Input Voltage Range opt. 10:

  • 100 to 300 MHz: -21 dBm to +35 dBm
  • 0.3 to 2.5 GHz: -27 dBm to +35 dBm
  • 2.5 to 2.7 GHz: -21 dBm to +35 dBm
  • 2.7 to 3.0 GHz: -15 dBm to +35 dBm

Prescaler Factor: 16

Impedance: 50 Ω nominal, VSWR <2.5:1 typ.

Max Voltage without Damage: +35 dBm

Connector: Type N Female

Input C (Option 110)

Freq. Range: 0.4 to 24 GHz; SW license enabled to 10, 15, 20 or 24 GHz

Operating input voltage range:

  • 400 to 600 MHz: -21 to +27 dBm
  • 0.6 to 17 GHz: -27 to +27 dBm
  • 17 to 19 GHz: -24 to +27 dBm
  • 19 to 21 GHz: -21 to +27 dBm
  • 21 to 24 GHz: -15 to +27 dBm

Prescaler Factor: 64

Impedance: 50 Ω nominal, VSWR <2.0:1 typ.

AM tolerance: > 90% within sensitivity range

Max Voltage Without Damage: +27 dBm

Connector: 2.92 mm, SMA compa ble Female

3. Rear Panel Inputs and Outputs

Reference Input

Frequency: 1, 5, or 10 MHz; 0.1 to 5Vrms sine

Impedance: 50 Ω (nom.)

Reference Output

Source: External input if used, otherwise internal

Frequency: External ref freq., or 10 MHz (internal)

Output impedance: 50 Ω

Amplitude: 1Vrms sine into 50 Ω (nom.)

Arming Input

Arming of all measuring functions

  • Impedance: Approx. 1kΩ
  • Freq. Range: DC to 200 MHz
  • Trigger level: approx. 1.5V fixed
  • Trigger slope: Pos. or neg. selectable

Programmable Pulse Output (Option 132)

Pulse mode: Pulse generator, Gate open, Alarm

Period range: 10ns-2s in 2ns steps

Pos. Pulse width range: 4ns-2s in 2ns steps

Min negative pulse width: 6ns

Rise time: 2.5 ns (nom.)

Output impedance: 50 Ω (nom.)

Output level: Low <0.4V; High: 4.5-5.25V (open
output); 2.0-2.5V (50 ohm load)

4. Auxiliary Functions

Trigger Hold-Off

Time Delay Range: 20 ns to 2 s in 10 ns steps

External Start and Stop Arming


  • Start Arming
  • Stop Arming
  • Ext. Gate (combined Start and Stop Arming)

Arming channels: A, B, D, E or rear panel ARM

Arming delay to first trigger ready: <5 ns (typ.)

Start/Stop Time Delay Range: 20 ns to 2 sec.


Functions: Maximum, Minimum, Mean, Δmax-min, Standard Deviation and Allan Deviation

Display: Numeric or frequency distribution graph

Sample Size: 2 to 16×106 samples

Max. sample rate:

  • up to 140 kSa/s calculated
  • up to 20 MSa/s captured

Limit alarm

Graphical indication of limits with Pass/Fail message on front panel,

Limit Qualifier: OFF or Capture values above, below, inside or outside limits

Sample Interval (Gate time)

The Sample Interval sets the measuring time (gate) in Frequency/Period modes, the timing gate in Totalized timed measurements, and the time between measurements/samples in all other modes.

Range: OFF or 50 ns to 1000 sec.


Functions: OFF, (K*X-L)/M, (K/X-L)/M, X/M-1 X is current reading, and K (Scale factor), L (Nulling value) and M (Reference value) are constants

Other Functions

Timebase Reference: Internal, External or Autoselected

Restart: Aborts current measurement and starts a new

Run/Hold: Switch between RUN (continuous measurements) and HOLD (Freezes result, until a new measurement is initiated via Restart)

Save and Recall Settings and Measurements

Instrument Set-ups can be saved/recalled. Setups saved to internal memory can be user protected.

Measurement results (RAM) can be accessed by connected PC, and/or saved in internal non-volatile memory, and moved to USB stick.

Max. Measurement Speed and Storage size (RAM):

20 MSa/s (1 to 4 inputs): 16k samples

12.5 to 3.125 MSa/s (1 to 4 inputs): 32M samples


Display: Graphic screen for menu control, numerical read-out, status information, plus distribution, trend and time-line graphs

Resolution: 1280×720 pixels

Type: Color Touch 5” TFT LCD display with backlight

Front panel accessible tools: Graph smoothing, pan and zoom, cursor read-out

5. Remote interfaces

Remote operation

Programmable Functions: All front panel accessible functions

Max. measurement rate (depending on measurement settings):

Block mode: up to 170k readings/s

Individual results: up to 200 readings/s

To Internal Memory: 20M readings/s

Data Output format: ASCII, IEEE double precision floating point, or packed

USB interface

USB version: 2.0


Rear panel: 1x Type B; (Device) used for remote communication and data transfer both ways

Front panel: 2x Type A; (Host) used for FW updates, mouse/keyboard connec” on, external result storage, WiFi dongle

Protocol: USBTMC-USB488

LAN & WLAN interface

Speed: 10/100/1000 Mbps


  • Web server
  • SCPI over HiSLIP protocol, compatibility with VISA

Supported WiFi USB-dongles: TP-Link TL-WN321G, TP-LINK Archer T4U v.2, TPLINK Archer T4U v.3, Netgear A6150 – AC1200, TP-Link TL-WN725N, Asus AC53Nano

6. Calibration of Timebase Oscillator

Mode: Closed case, electronic calibration, menu controlled. Calibration menu is password protected

Ref. Cal. Frequencies: 1, 5, 10, 1.544 or 2.048 MHz

7. General Specifications

Environmental Data

Class: MIL-PRF-28800F, Class 3

Installation category: II

Operating Temp:

0°C to +50°C / 5..75%RH bench-top,
0°C to +40°C / 5..75%RH rack-mount

Storage Temp: -40°C to +71°C

Vibration: Random and sinusoidal according to MIL-PRF-28800F, Class 3

Shock: Half-sine 30G per MIL-PRF-28800F; Bench handling

Transit drop test: According to MIL-PRF-28800F

Safety: EN 61010-1:2011, pollution degree 2, installation/over voltage category II, measurement category I, CE, indoor use only
CSA C22.2 No 61010-1-12

EMC: EN 61326-1:2013-06, increased test levels according to EN 61000-6-2:2008, Group 1, Class B, CE

Power Requirements

Max. Version: 100-240 VAC 50-60 Hz (Nom.), <70 W

Dimensions and Weight

Width x Height x Depth: 210 x 90 x 395 mm (8.25 x 3.6 x 15.6 in)

Weight: Net 3 kg (6.6 lb)

8. Time Base Options

Option modelSTD3040
Time base type:TCXOOCXOOCXO
Uncertainty due to:-Aging per 24h per month per year-Temperature variations: 0˚C to 50˚C 20˚C to 26˚C (typ. values)n/a <2×10-7 (typ.) <1×10-6 <5×10-7 not specified<5×10-10 (1) <1×10-8 <5×10-8 <5×10-9 <1×10-9<3×10-10 (1) <3×10-9 <1.5×10-8 <2.5×10-9 <4×10-10
Short-term stability: τ =1s (root Allan Variance) τ =10s<1×10-9 (typ.)<1×10-11 <1×10-11<5×10-12 <5×10-12
Power-on stability:Deviation vs. final value after 24 h on time, after a warm-up time of:<1×10-6 5 min<1×10-8 10 min<5×10-9 10 min
Typical total uncertainty, for operating temperature 20˚C to 26˚C, at 2σ (95%) confidence interval:
-1 year after calibration
-2 years after calibration
<1.2×10-6 <2.4×10-6<6×10-8 <1.2×10-7<1.8×10-8 <3.5×10-8
1After 1 month of continuous operation

9. Ordering Information

Basic model

CNT-104S: 4-channel 400 MHz Frequency Analyzer, 7 ps resolution, std. TCXO timebase 1 ppm/year

Input C Frequency Options

Option 10: 3 GHz Input C

Option 110: 10 GHz Input C (HW)

Option 110/15: SW upgrade from 10 to 15 GHz

Option 110/20: SW upgrade from 15 to 20 GHz

Option 110/24: SW upgrade from 20 to 24 GHz

Timebase Oscillator Options

Option 30: Very High Stability, OCXO 50 ppb/year

Option 40: Ultra High Stability, OCXO 15 ppb/year

Other options (SW license enabled)

Option 132: Programmable pulse output

Option 151: TIE measurement function

Included with Instrument:

  • 2 year product warranty1
  • Line cord (dependent on destination country)
  • Link to User documentation (PDF)
  • Certificate of Calibration
  • Important information document

1: Warranty period may be extended to 3 years, at no cost, by registrating the product

Optional Accessories

  • Option 22/90: Rack-Mount Kit- 1 unit
  • Option 22/05: Rack-Mount Kit -2 units
  • Option 27: Carrying Case – soft
  • Option 27H: Heavy-duty Hard Transport Case
  • Option 90/03: Calibration Certificate with Protocol; Standard TCXO oscillator
  • Option 90/06: Calibration Certificate with Protocol; Oven oscillator
  • Option 95/05: Extended warranty 2 extra years
  • OM-100: User’s Manual English (printed)2
  • PM-100: Programmer’s Manual English (printed)2
  • SM-100: Service Manual English
  • GS-100-EN: Getting Started English (printed)2

2: Always available as download from the Pendulum website