TTi PFM3000 - Frekvenčný čítač s vysokým rozlíšením 3GHz
PFM3000 - 3GHz high resolution Frequency Counter
3 Hz to 3000 MHz in two overlapping ranges
High input sensitivity over the full frequency range
High impedance measurement up to 125 MHz
Reciprocal counting technique gives superior resolution
Period measurement from 3 Hz to 125 MHz
Battery operation and lightweight, handheld format
Push-to-measure function with auto power-down
Large 8+ digit display with full range of annunciators
Selectable measurement time; display hold function
Noise filter for low frequency measurements
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Wide frequency range and high resolution The PFM3000 uses a continuous reciprocal measurement technique to provide high resolution at all frequencies with rapid update. It offers high sensitivity across the whole frequency range. A low pass filter can be selected to reduce high frequency signal noise at lower frequencies. A Large and clear display Annunciators are provided for measurement function, measurement time, overflow, trigger activity, low battery, and measurement units. |
Low power consumption and push-to-measure A push-to-measure capability gives a virtually instantaneous reading followed by an automatic power down after 15 seconds. This provides greatly extended battery life where continuous monitoring of the signal is not required. Bench-top use |
| MEASUREMENT FUNCTIONS | |
| Frequency (Range A) | |
| Frequency Range: | 3Hz to 125MHz |
| Resolution: | 10-7Hz to 100Hz (see Note) |
| Frequency (Range B) | |
| Frequency Range: | 80MHz to 3000MHz |
| Resolution: | 1Hz to 10kHz (see Note) |
| Period (Range A only) | |
| Period Range: | 8ns to 330ms |
| Resolution: | 10-7ns to 1us (see Note) |
| Measurement Time | |
| Selectable as 10s, 1s or 0.1s. (Note that for the 0.1s setting the effective measurement time is 0.3 seconds). | |
| Resolution | |
| The displayed resolution depends upon the measurement time and the input frequency. Eight digits (or nine using an overflow indication) are displayed for a 10s measurement time. Seven or eight digits are displayed for a 1s measurement time, and six or seven digits for 0.1s depending upon the input frequency. Usable resolution may be further reduced by noise, particularly at low frequencies. |
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| Accuracy | |
| Measurement accuracy is the sum of the timebase accuracy and measurement resolution plus one count. | |
| TIMEBASE | |
| Crystal Oscillator Frequency: | 10MHz |
| Initial Oscillator Adjustment Error: | ± 2ppm (closed-case adjustable by user) |
| Oscillator Temperature Coefficient: | Typically less than ± 0.3ppm/°C 18°C to 28°C, ±10ppm –20°C to 70°C |
| Oscillator Ageing Rate: | <± 5ppm/year |
| OPERATING FUNCTIONS | |
| Press to measure | |
| With the power switch off, pressing any of the function select keys will power the instrument up in the corresponding function. The instrument will automatically switch off 15 seconds after the last key press. | |
| 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. | |
| Noise filter | |
| The Filter key controls a low pass filter, with a cut-off frequency of about 50kHz, to ensure stable readings at low frequencies. | |
| Signal activity indicator | |
| When no input signal is detected the Trig indicator will be off, indicating that no measurement is possible. The gate time indicator flashes until the first measurement interval is complete. | |
| INPUT SPECIFICATIONS | |
| Input A | |
| Input Impedance: | 1MOhm//20pF (AC coupled) |
| Frequency Range: | 3Hz to 125MHz |
| Sensitivity: | Sinewave - 15mVrms 10Hz-125MHz |
| Input B | |
| Input Impedance: | 50Ohm (AC coupled) |
| Frequency Range: | 80MHz to 3000MHz |
| Sensitivity: | Sinewave - 15mVrms 80MHz-2GHz, 50mVrms to 3GHz |
| Maximum Input Voltage | |
| Input A and Input B: | 30Vdc; 30Vrms 50Hz/60Hz reducing to 1Vrms above 1MHz |
| Note that the inputs will not be damaged if subjected to an accidental short-term connection to a 50/60Hz line voltage not exceeding 250V rms. | |
| DISPLAY | |
| No. of Digits: | 8 full digits plus overflow indicator for 8.5 digits |
| Size of Digits: | 11.5mm (0.45”) |
| Annunciators: | 15 annunciators |
| POWER REQUIREMENTS | |
| Battery Type: | 9V PP3 alkaline |
| Battery Life: | Typically 20 hours |
| Low Batt. Indicator: | ‘Bat’ shows in display when approximately 10% of battery life remains |
| GENERAL | |
| Operating Range: | +5°C to +40°C, 20% to 80% RH |
| Storage Range: | -20°C to +60°C |
| Environmental: | Indoor use at altitudes up to 2000m Pollution Degree 2 |
| Size: | 81mm x 178mm x 30mm (W x L x D) |
| Weight: | 190gms excluding battery |
| Electrical Safety: | Complies with EN61010-1 |
| EMC: | Complies with EN61326 |
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