Time Electronics 7027 - Universal Frequency Counter Module
The 7027 is a high quality 3GHz universal frequency counter module which offers period measurement, frequency ratio, pulse width and event counting. It uses an advanced reciprocal frequency counting technique to achieve high resolution at all frequencies. A DC coupled input enables VLF measurements to be made (down to 1mHz). The timebase uses a high quality TCXO crystal with a very low ageing rate. An external reference can also be used. The large 10 digit LCD display has a full set of annunciators. Measurement times can be set between 0.3 seconds and 10 seconds.
Pulse width measurements can be made from rising to falling or falling to rising edge with adjustable thresholds. A variable attenuator is incorporated the input impedance is switchable between 1MW and 50W.
Full remote control and read-back is provided via a USB interface, situated at the rear of the bench console.
Features
High measurement accuracy
The 7027 uses a high quality temperature compensated internal frequency reference (TCXO) which has a low aging rate and is stable to within ±1ppm over the full temperature range. Its short warm-up time allows accurate measurements. An External Reference input is provided and changeover from the internal timebase is automatic when an external reference standard is connected.
High resolution
For frequency, period and frequency ratio functions the instrument uses a reciprocal counting technique to provide high resolution at all frequencies. Eight significant digits of answer are produced in a 1 second measurement time, nine digits in 10s and ten digits in 100s with a granularity of less than 2 counts in the least significant digit.
Flexible signal conditioning
Input A has configurable coupling (AC or DC), input impedance (1MW or 50W), attenuation (1:1 or 5:1), threshold (fully variable) and active edge, and can be used for frequencies in the range 0.001Hz to >125MHz.Input B is a nominal 50W input for frequencies in the range 80MHz to > 3GHz.
Multiple measurement functions
The 7027 can measure frequency, period, pulse width, duty cycle and frequency ratio, as well as event counting (totalise).
Remote control and read-back via USB
The 7027 incporporates a USB interface which allows it to be remotely controlled using RS232 protocol via a computer's USB port. Connection is via the rear of the calibration bench.
Ten digit LCD
The high contrast display has ten 12.5mm (0.5) high digits along with acomprehensive set of annunciators. These show input configuration and function, measurement time and status, external reference connection, low battery and the units of the measurement which may be Hz, kHz, MHz, ns, us, ms or s.
- DC to 3GHz frequency range
- Freq, period, pulse width modes
- Ratio and event counter modes
- Reciprocal counting measurements
- High impedance measurement
- 10 digit LCD display
- Remote control/readback via USB
Technical Specifications
Input Specifications
|
Input A |
Input Coupling: AC or DC |
|
Input B |
Input Impedance: 50W (AC coupled) |
|
External Reference |
Input Impedance: >100kW, AC coupled |
|
Maximum Input Voltage |
Input A and Input B: 30Vdc; 30Vrms 50Hz/60Hz reducing to 1Vrms above 1MHz |
Measurement Specifications
|
Frequency |
A Input Range: 0.001Hz (DC coupled) to >125MHz |
|
Period |
A Input Range: 8ns to 100s (DC coupled) |
|
Pulse Width Mode |
Functions: Width high, width low, ratio H:L (high time to low time) and duty cycle |
|
Total Count (Input A only) |
Count Range: 1 to 9 999 999 999 |
| Frequency Ratio B:A | Resolution: Equal to the resolution of the two frequency measurements. If the ratio exceeds 10 digits, 6 digits and the exponent are displayed. |
| Measurement Time | Selectable as 100s, 10s, 1s or 0.3s. The instrument displays the average value of the input signal over the measurement time selected, updated every 2s, 1s, 0.5s or 0.3s respectively. The hardware captures the count values and continues measuring without any dead time. |
| Resolution | The displayed resolution depends upon measurement time and input frequency. The basic resolution of period is 8 digits for every 2 seconds of measurement time. Frequency resolution is the reciprocal of period resolution. Usable resolution can be reduced by noise at low frequencies. |
| Accuracy | Measurement accuracy is timebase accuracy + measurement resolution + 2 counts. |
Timebase
| Measurement Clock | 50MHz |
| Internal Reference | 10MHz TCXO with electronic calibration adjustment (> +/- 8ppm) |
| Temperature Stability | Better than ± 1ppm over rated temperature range |
| Initial Error | < ± 0.2ppm at 25°C |
|
Ageing Rate |
< ± 1ppm/year |
Operating Facilities
| Noise Filter | The Filter key controls a low pass filter, with a cut-off frequency of about 50kHz, to ensure more stable readings at low frequencies. |
| Hold | Pressing the Hold key will stop further measurements being made and the current measured value will remain in the display, with the Hold indicator on, until the Hold key is pressed again. A long press on the Hold key clears old data and restarts the measurement. |
| Intelligent Power Switching | The unit automatically selects the best available power source of AC adaptor, USB or battery. Intelligent switching avoids discharging the battery overnight when operated from externally switched AC power. A press-to-measure facility allows a quick measurement to be made by pressing a function select key which will power the instrument up in the corresponding function. The instrument will automatically switch off 15 seconds after the last key-press. |
|
Signal Activity Indication |
Dual bi-colour LEDs show signal activity & indicate whether a DC coupled signal is above or below trigger threshold. |
General Specifications
| Display | 10 digits |
| Interface | USB on rear of bench console |
| Module Width | 295mm (primary console fitting only) |
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