Specification for Topward 1220 Frequency Counter
| Frequency Range | 0.1Hz to 3GHz |
| Display Digits | 8 Digits 0.5" Green LED Displays |
| FREQUENCY MEASUREMENT | |
| Range (Direct) | 0.1Hz to 100MHz |
| Range (Pre-Scale) | 100MHz to 3GHz |
| Gate Time (Direct) | 0.01S, 0.1S, 1S, 10S |
| Gate Time (Pre-Scale) | 0.05S, 0.512S, 5.12S, 51.2S |
| Resolution (Direct) | 100Hz, 10Hz, 1Hz, 0.1Hz |
| Resolution (Pre-Scale) | 10KHz, 1KHz, 100Hz, 10Hz |
| Accuracy | ± (1 count + Timebase Accuracy + Trigger Error) |
| INPUT SELECTION | |
| Sensitivity (CH-A) | (15mVrms) / 100MHz |
| Sensitivity (CH-C) | -27dBm (10mVrms) / 2.7GHz; -21dBm (20mVrms) / 3GHz |
| Impedance (CH-A) | 1MW |
| Impedance (CH-C) | 50W |
| Attenuator (CH-A) | X1, X20 |
| AC / DC Coupling | Only on Channel A |
| Low Pass Filter | 100KHz nominal 3dB point (Channel A Only) |
| Trigger Level ADJ. | Only on Channel A (+2.5VDC to –2.5VDC) |
| TIMBASE | |
| Freq. (Direct) | 10MHz ± 10ppm |
| Freq. (Pre-Scale) | 19.53125MHz ± 2.5ppm |
| Power Source | ACV 115V / 230V, ± 10%, 60Hz / 50Hz |
| Dimension | 262 (W) x 85 (H) x 260 (D) |
| Gross Weight | 1.6Kg |
| Accessories | ACS-003 BNC to clip X1, Operation manual X1 |