Overview Performance Options

Universal Counter SC-7205A Performance

Frequency A(FREQ-A, FREQ-B)

■ Measurement range and resolution
Reference time (reference frequency) 100ns(10MHz)
range Coupling DC 0.6mHz～230MHz
Coupling AC 10Hz～230MHz
Resolution and count method Measured signal Less than 10MHz 10MHz or more
Count method Reciprocal count Direct count
1ms gate 4-digit 1kHz
10ms gate 5-digit 100Hz
0.1s gate 6-digit 10Hz
1s gate 7-digit 1Hz
10s gate 8-digit 0.1Hz
EXT-B gate * Reciprocal count method. The maximum number of digits is determined by the EXT gate time.
SGL gate Reciprocal count method. The number of digits is determined by the measured signal.

* EXT-B cannot be used when using FREQ-B input.

Measurement error

• The reference oscillator accuracy is the temperature characteristic of the reference oscillator.

Frequency LINE(FREQ-LINE)

■ Measurement range and resolution
Reference time 100ns
range 45Hz～440Hz
Resolution 0.1s gate 6-digit
1s gate 7-digit
10s gate 8-digit
Measurement error

• The reference oscillator accuracy is the temperature characteristic of the reference oscillator.

Period A(PERI-A)

■ Measurement range and resolution
Reference time 100ns
range DC couple 5ns～1,717s
AC couple 5ns～0.1s
Resolution Count method Reciprocal count
1ms gate 4-digit
10ms gate 5-digit
0.1s gate 6-digit
1s gate 7-digit
10s gate 8-digit
EXT-B gate The maximum number of digits is determined by the external gate time
SGL gate The number of digits is determined by the measured signal
Measurement error

• The reference oscillator accuracy is the temperature characteristic of the reference oscillator.

Duty ratio A(DUTY-A)

■ Measurement range and resolution
Input signal frequency range Same as FREQ-A
Measurement range SGL gate 0.01µ～99.999,999,99[%]
Internal gate 2µ～99.999,998[%]
Measurement resolution
(Internal gate average count)		 SGL gate 100ns/input cycle × 100[%]
1～24
24～2,499
2,500～249,999
250,000～24,999,999
25,000,000 or more		 100ns/average input cycle × 100[%]
10ns/average input cycle × 100[%]
1ns/average input cycle × 100[%]
100ps/average input cycle × 100[%]
10ps/average input cycle × 100[%]
Measurement error

Pulse width A(P.W-A)

■ Minimum pulse width

 6ns

■ Maximum repetition frequency

 80MHz

■ Measurement range and resolution
Reference time 100ns
Measurement range SGL gate 100ns～1,717s
Internal (1 ms to 10s) gate 100ns to approx. 1/2 gate time
Measurement resolution
(Internal gate average count)		 SGL gate 100ns～1ms
1～24
24～2,499
2,500～249,999
250,000～24,999,999
25,000,000 or more		 100ns
10ns
1ns
100ps
10ps
Measurement error

• The reference oscillator accuracy is the temperature characteristic of the reference oscillator.

Time intervalA→B (T.INT A→B)

■ Minimum time interval

 6ns

■ Maximum repetition frequency

 80MHz

■ Measurement range and resolution
Reference time 100ns
Measurement range SGL gate 100ns～109,951s
Internal (1 ms to 10s) gate 100ns to approx. 1/2 gate time
Measurement resolution
(Internal gate average count)		 SGL gate 100ns～100µs
1～24
24～2,499
2,500～249,999
250,000～24,999,999
25,000,000 or more		 100ns
10ns
1ns
100ps
10ps
Measurement error

• The reference oscillator accuracy is the temperature characteristic of the reference oscillator.

Frequency ratio A/B (FREQ A/B)

■ Measurement range and resolution
Input signal frequency range Both CH-A and CH-B are the same as FREQ-A
Measurement range Internal gate(1ms～10s) 1E-9～1E+9
Measurement resolution Internal gate(1ms～10s) 1 + LOG (CH-A input frequency x gate time) digits
Measurement error

Phase measurementA→B (PHAS A→B)

■ Minimum time interval

 6ns

■ Maximum repetition frequency

 80MHz

■ Measurement range and resolution
Reference time 100ns
Measurement range SGL gate 0.1µs～359.999,999,9[º]
Internal gate 10µ～359.999,99[º]
Measurement resolution
(Internal gate average count)		 SGL gate 100ns/input cycle × 360[º]
1～24
24～2,499
2,500～249,999
250,000～24,999,999
25,000,000 or more		 100ns/input cycle × 360[º]
10ns/input cycle × 360[º]
1ns/input cycle × 360[º]
100ps/input cycle × 360[º]
10ps/input cycle × 360[º]
Measurement error

Addition counting measurement(TOT-A)

■ Minimum response pulse width

 2.5ns

■ Input frequency range

 Same as FREQ-A

■ Measurement range

 Counts from 0 to 4,294,967,295 when the scaling operation is OFF

■ Measurement error

 ±1 [count] (only when the gate is opened and closed)

Peak voltage measurement

The voltage amplitude of the CH-A or CH-B measured signal is measured and displayed in real time.

■ Measurement frequency

 150Hz ≤ Input frequency ≤ 50MHz

■ Measurement speed

 2 seconds or less
Measurement range ATT OFF -2.50V to +2.50V (10mV resolution)
ATT ON -50.0V to +50.0V (100mV resolution)
Measurement error ATT OFF 10% ±50mV of displayed value (for sine waves)
ATT ON No specification

CH-A/B input terminal

■ Maximum input voltage

 200V(DC+ACpeak)

■ Impedance

 Approx. 1MΩ//20pF or less

■ Coupling

 AC or DC

■ Low pass filter

 None or 10kHz

■ Attenuator

 None or 26dB (1/20)

■ Trigger level
Measurement range ATT OFF -2.50V to +2.50V (10mV resolution)
ATT ON -50.0V to +50.0V (100mV resolution)
Measurement accuracy(0～+40ºC) ATT OFF 10% ±30mV of the set value (however, +2 to -2V is ±3%)
ATT ON 10% ±300mV of the set value (however, +40 to -40V is ±3%)

■ Operating range

 ATT OFF -2.50V～+2.50Vpeak
ATT ON -50.0V～+50.0Vpeak

■ Input sensitivity
Manual trigger ATT OFF 30mVrms(DC～230MHz)
ATT ON 0.6Vrms(DC～230MHz)
Auto trigger ATT OFF 200mVrms (10kHz to 230MHz for sine waves)
ATT ON 4mVrms (10kHz to 230MHz for sine waves)
Measurement error

10MHz STD IN

BNC terminal for inputting more stable reference frequencies from the outside.
Input frequency 10MHz±50Hz(±5ppm)
Input amplitude 1Vrms～5Vrms Threshold = 0V
Input resistance Approx. 6.4kΩ
Input coupling AC

10MHz STD OUT /(MARKER OUT)

BNC terminal for outputting internal reference oscillator or marker signals.
A marker signal is a signal assuming the luminance modulation (Z axis) of the analog oscilloscope. It is valid when the function is the SGL gate of the time interval (T.INT A→B) and phase (PHAS A→B), and the period from the start of the CH-A measurement to the start of the CH-B measurement is output = L.
Output CMOS level
Reference frequency output The 10MHz stability is the same as the standard transmitter on the main unit
Marker output Bandwidth 5MHz Output L for the actual measurement period.

Output interface

RS-232 Standard equipment
GPIB Factory option(SC-701)
Digital I/O Factory option(SC-702)

Environmental conditions

  • Preheating time：At least 60 minutes
  • Operating temperature/humidity 0ºC to +40ºC/85% R.H or less (no condensation)
  • Storage temperature/humidity -20ºC to +60ºC/90% R.H or less (no condensation)

Reference oscillator

Equipped as standard. Can be output to the 10MHz OUT BNC terminal on the rear of the main unit.

  • Oscillation frequency 10MHz
  • Temperature characteristics ±2.5ppm/equipment ambient temperature 0ºC～+40ºC
  • Change over time ±1.0ppm/year

Change in power supply conditions and power supply voltage (factory option)

  • Power supply voltage 100VAC ±10%
    Change in power supply voltage (factory option)：110～120V or 220～240V
  • Power supply frequency 50Hz, 60Hz, 400Hz
  • Power consumption 31VA MAX (at 100VAC with optional SC-701 and SC-702)

Size, mass

  • Size：Approx. 210W × 99H × 353L mm (excluding options and protruding parts)
  • Mass：4.0kg or less (when equipped with optional SC-701, SC-702, SC-703A)

Accessories

  • Power cord (1), Instruction manual (CD-ROM) (1), User's Guide (1)